CA2154016C - Anti-blocking clear ink receiving sheet - Google Patents
Anti-blocking clear ink receiving sheet Download PDFInfo
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- CA2154016C CA2154016C CA002154016A CA2154016A CA2154016C CA 2154016 C CA2154016 C CA 2154016C CA 002154016 A CA002154016 A CA 002154016A CA 2154016 A CA2154016 A CA 2154016A CA 2154016 C CA2154016 C CA 2154016C
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- ink
- receiving sheet
- receptive coating
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- sheet according
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
- B41M5/508—Supports
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5236—Macromolecular coatings characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24893—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/252—Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/254—Polymeric or resinous material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/259—Silicic material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
- Y10T428/273—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.] of coating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31—Surface property or characteristic of web, sheet or block
Abstract
The present invention is directed to an ink receiving sheet having anti-blocking properties, containing:
a) a polymer substrate, b) an ink receptive coating disposed on at least one layer which having a water-soluble component, and c) particulates dispersed in the ink receptive coating, having an average particle size of from 15 µm to about 50 µm, a particle size span is equal to or smaller than 1.0, and a refractive index of from about 1.2 to about 2.4. The present invention is also directed to the ink receptive coating per se, and to methods of ink jet printing using the above ink receiving sheet.
a) a polymer substrate, b) an ink receptive coating disposed on at least one layer which having a water-soluble component, and c) particulates dispersed in the ink receptive coating, having an average particle size of from 15 µm to about 50 µm, a particle size span is equal to or smaller than 1.0, and a refractive index of from about 1.2 to about 2.4. The present invention is also directed to the ink receptive coating per se, and to methods of ink jet printing using the above ink receiving sheet.
Description
TW_132 Antfblxking clear ink receiving sheet Background of the invention Field of the invention The present invention relates to an ink receiving sheet, and more particularly, to a transparent ink receiving sheet having anti-blocking properties for use with ink jet printers.
Description of the related arts In order to achieve high color density and fidelity during ink jet printing on an ink receiving sheet, the laydown of the ink receiving sheet is usually high.
However, current commercial ink receiving sheets, in particular transparent ink receiving sheet, do no allow high ink laydown because of blocking between image that is formed on the ink receiving sheet and any materials that may come into contact with the image. In other words, because of the nature of the ink and the ink receiving sheet, ink undesirably transfers from the ink receiving sheet to materials in contact with the ink receiving sheet. The blocking has become one of the major problems in the field, particularly with high speed ink jet printers.
There have been many attempts in improving anti-blocking performance of ink receiving sheets. A number of designs have been proposed for use in various ink receiving sheets. Iqbal et al., US Patent 4,935,307, discloses an ink permeable protective layer containing a particulate material; Desjarlais, US Patent 4,775,594, discloses use of silica as an anti-blocking agent; Light, US Patent 5,084,338, discusses inert particles having a particle size of 25 pm or less; Bedell, US
Patent 4,547,405, also discusses use of particles such as glass beads in the ink receiving sheet. Although these proposals disclose use of particles, none of them have specified three key functional parameters: particle size distribution, particle size limitation and refractive index. Desired anti-blocking property and clarity only can be achieved when the particle size, particle size distribution and refractive index are optimized. When the particle size is too small, the particles do not pretrude through the ink receiving coating and anti-clocking property is poor. When the particles are too large, the particles will be projected when the ink receiving sheet is used as a transparency for presentation. In addition, the difference in refractive indices between the particle and the ink receiving coating affects the clarity and projection quality. Obviously, the solutions proposed in the prior arts do not solve the problems in the field. These designs have to compromise anti-blocking properties and clarity.
As a result, an undesirable compromise must be made between ink laydown and anti-blocking property.
The present invention discloses an optimized design that offers both excellent anti-blocking property and high clarity of the ink receiving sheet.
Summary of the invention An object of the present invention is to provide a transparent ink receiving sheet which will avoid the blocking problems associated with prior art ink receiving sheets, while still maintaining high ink laydown and clarity.
Another object of the present invention is to provide an ink receptive coating for an ink receiving sheet which will impart anti-blocking properties without the need for a separate ink permeable protective coating, while still maintaining high ink laydown and good clarity.
A further object of the present invention is to provide an improved ink jet printing process for printing images on transparent ink jet receiving sheets, which avoids the problems associated with prior art processes.
These and other objects and advantages are obtained by the present invention, which presents a solution to the need for an anti-blocking clear ink receiving sheet. The improvements in anti-blocking property and clarity are attained, according to the invention, by using specific particulates as a spacer in the ink receiving sheet.
More particularly, the objects and advantages of the present invention are obtained by an ink receiving sheet having anti-blocking properties, comprising a) a polymer substrate, b) an ink receptive coating disposed on at least one side of the substrate, and comprising at least one layer which comprises a water-soluble component, c) particulates dispersed in said ink receptive coating, having an average particle size of from about 15 Nm to about 50 Irm, preferably from about 20 Nm to about 40 Nm and a particle size span is equal to or smaller than 1.0, preferably <
0.8, and d) particulates dispersed in said ink receptive coating having a refractive index of from about 1.2 to about 2.4, wherein the ink receptive coating has a surface through which said particulates are exposed.
The objects and advantages of the present invention are also obtained by an ink receptive coating for an ink receiving sheet, comprising 1 ) at least one layer comprising a water-soluble component, and 2) particulates dispersed therein having an average particle size of from 15 Nm to about 50 Nm, a particle size span is equal to or smaller than 1.0 and a refractive index of from 1.2 to about 2.4, wherein this coating has a surface through which the particulates are exposed.
~154~~6 Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while they may indicated preferred embodiments of the invention, are given by way of illustration only, since various change and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
Detailed description of the invention Examples of suitable substrate for the ink receiving sheet include transparent plastics, such as polyethylene terephthalate), polycarbonate, polystyrene, cellulose 1o esters, polyvinyl acetate), and others. The thickness of the substrate is not particularly restricted, but should be in the range of about 1.5 to about 10 mils, preferably about 2.0 to about 5.0 mils. The substrates may be pretreated to enhance adhesion of the coatings thereto. The ink receptive coating, which is disposed on at least one side of the polymer substrate, contains at least one layer comprising at ~ 5 least one water-soluble component. The ink receptive coating may have a single layer structure, or may have multiple layers. When multiple layers are present, the particulates can reside in any of these layers, as long as the particulates are exposed on the surface of the ink receptive coating.
The ink receptive coating may contain both water-soluble and water-insoluble 2o components, as long as the ink receptive coating functions to receive ink.
Examples of water-soluble components include polyvinyl alcohol), polyvinyl acetate), polyvinyl pyrrolidone), poly(acrylic acid), cellulose esters, gelatins, proteins, polyethylene oxide), alginates, polyethylene glycol) and water-soluble gums.
Examples of water-insoluble components include methyl methacrylate, styrene, 25 urethane, butadiene, 2-hydroxyethyl acrylate, ethyl acrylate, N-hydroxyethyl acrylamide, N-hydroxymethyl acrylamide, and ethylene terephthalate. These water-soluble and water-insoluble components may be incorporated as the component of a homopolymer, a copolymer, or a polymer blend. The coating weight of the ink receptive coating may be from about 2 g/m2 to about 30 g/m2 and preferably, from 30 about 4 g/m2 to about 20 g/m2.
The particulates disclosed in this invention have an average particle size of from 15 Nm to about 50 Nm, preferably from about 20 Nm to about 40 Nm; a particle size span is equal to or smaller than 1.0, preferably ~ 0.8; and a refractive index of from about 1.2 to about 2.4. Examples of the particulates include glass beads, 35 poly(methyl methacrylate), polystyrene, starch, silica, polyurethane, calcium carbonate and other organic and inorganic particles specified particle size, particle size span and refractive index.
The concentration of the particulates in the ink receiving sheet may be from ~~1 ~~~16 about 0.5% to about 10% (weight percentage based on coating solid content), depending on the particle size, the particle size distribution and ink laydown.
Usually, low concentration is required when large particulates having small particle size span are used.
The smoothness of the ink receiving sheet disclosed in this invention may be from about 200 to about 400 Sheffield units, preferably from about 240 to about 360 Sheffield units. The haze of the ink receiving sheet is < 8%. The Sheffield smoothness was measured on Paper Smoothness Tester, model 538 (Hagerty Technologies). The haze was measured on Haze Guard System, XL-211 (BKY
Gardner). The average particle size and the particle size distribution ware measured on MasterSizer, MS-20 (Malvern Instruments). The average particle size is defined by the mean particle size or D50. The particle size distribution is expressed by the particle size span, which is defined as:
Particle Size Span = (D90-D10)/(D50) where D90 is the 90th percentile diameter, D10 is the 10th percentile diameter, and D50 is the 50th percentile diameter.
When the ink receptive coating is one side of the substrate, the side of the substrate which is not covered with ink receptive coating may to a backing material in order to reduce electrostatic charge and to reduce sheet-to-sheet friction and 2o sticking. The backing material may be either a polymer coating, an ink receptive coating, a polymer film, or paper, in accordance with what is known in the art, and is not particularly limited. To prevent stacking blocking, the particulates disclosed in this invention can also be added in the backing materials.
Any of a number of art recognized coating methods may be employed to coat the ink receptive coating onto the polymer substrate, such as roller coating, wire-bar coating, dip coating, extrusion coating, air knife coating, curtain coating, slide coating, doctor coating, or gravure coating. Such techniques are well known in the art.
The following examples are merely illustrative of the invention and are not to 3o be construed as limiting the invention.
Example 1 Underlayer PVP-K90' 12.0 parts Copolymer A2 7.5 parts Particulate 13 0.3 parts Dowanol PM4 17.3 parts MEK 61.4 parts Surface layer Hydroxyethyl cellulose5 1.8 parts Water 97.7 parts ~1~~4~16 ' Poly(vinyl pyrrolidone), GAF Corporation A copolymer of methyl methacrylate and hydroxyethyl methacrylate, 40% solid Glass bead, the average particle size is about 22 Nm, the particle size span is about 0.72 and the refractive index is about 1.65 (from the supplier) 5 4 Propylene glycol monomethyl ether, Dow Chemical Corporation Hydroxyethyl cellulose, Union Carbide The underlayer coating was coated on the polyester base using a No. 36 Meyer rod. After drying the underlayer coating at 120°C for about 2 minutes, the surface layer coating was coated using No. 8 Meyer rod under the same conditions.
The dry coat weight of the ink receptive coating is about 10 g/m2.
Example 2 Underlayer PVP-K90 9.6 parts Copolymer A 6.0 parts Quaternary copolymer' 8.6 parts Particulate I 0.3 parts Dowanol PM 16.3 parts MEK 57.7 parts Surface layer Hydroxyethyl cellulose 1.8 parts Water 97.7 parts ' Quaternary copolymer of methyl methacrylate and dimethylaminoethyl methacrylate, 35% solid The underlayer coating was coated on the polyester baseusing a No. 36 Meyer rod. After drying the underlayer coating at 120°C for about 2 minutes, the surface layer coating was coated using a No. 8 Meyer rod under the same conditions. The dry coat weight of the ink receptive coating is about 10 g/m2.
Example 3 Underlayer PVP-K90 12.0 parts Copolymer A 7.5 parts Particulate II' 0.3 parts Dowanol PM 17.3 parts MEK 61.4 parts Surface layer Hydroxyethyl cellulose 1.8 parts Water 97.7 parts ' Poly(methyl methacrylate), the average particle size is about 28 pm, the particle size span is about 0.65 and the refractive index is about 1.49 (from J.
Brandup &
E.H. Immergut, Polymer Handbook, third edition, John wily & Sons, 1989) The underlayer coating was coated on the polyester base using No. 38 Meyer rod. After drying the underlayer coating at 120°C for about 2 minutes, the surface I5:~~16 layer coating was coated using a No. 8 Meyer rod under the same conditions.
The dry coat weight of the ink receptive coating is about 10 g/m2.
Example 4 Underlayer PVP-K90 8.4 parts Copolymer B' 8.4 parts Quaternary copolymer 9.8 parts Particulate IIIZ 0.2 parts Dowanol PM 13.5 parts MEK 58.1 parts 1o Surface layer Hydroxyethyl cellulose 1.8 parts Water 97.7 parts ' A graft copolymer of methylmethacrylate and hydroxyethyl methacrylate, 25%
solid Glass bead, the average particle size is about 41 Irm, the particle size span is about 0.3 and the refractive index is about 1.51 (fram the supplier) The underlayer coating was coated on the polyester base using a No. 46 Meyer rod. After drying the underlayer coating at 120°C for about 2 minutes, the surface layer coating was coated using No. 8 Meyer rod under the same conditions.
The dry coat weight of the ink receptive coating is about 10 g/m2.
Comparative Example 1 Underlayer PVP-K90 8.67 parts Copolymer A 5.42 parts Quaternary copolymer 10.1 parts Dowanol PM 20.7 parts MEK 53.5 parts Surface layer Hydroxyethyl cellulose 0.5 parts Particulate IV 0.14 parts Water 98.4 parts ' Poly(methyl methacrylate), the average particle size is about 18 arm, the particle size span is about 1.19 and the refractive index is about 1.49.
The underlayer coating was coated on the polyester base using a No. 46 Meyer rod. After drying the underlayer coating at 120°C for about 2 minutes, the surface layer coating was coated using a No. 16 Meyer rod under the same conditions. The dry coat weight of the ink receptive coating is about 10 g/m2.
Comparative Example 2 Underlayer PVP-K90 8.7 parts Copolymer B 8.7 parts Quaternary copolymer 10.1 parts TW_132 Particulate V' 0.4 parts Dowanol PM 20.7 parts MEK 50.0 parts Surface layer Hydroxyethyl cellulose 1.8 parts Water 97.7 parts ' Corn starch, the average particle size is about 15 Nm, the particle size span is about 1.05 and the refractive index is about 1.52 (from Kirk-Othmer Encyclopedia of Chemical Technology, second edition, Volume 18, John Wiley & Sons, 1969) The underlayer coating was coated on the polyester base using a No. 46 Meyer rod. After drying the underlayer coating at 120°C for about 2 minutes, the surface layer coating was coated using a No. 8 Meyer rod under the same conditions. The dry coat weight of the ink receptive coating is about 10 g/m2.
Samples prepared according to the above examples and comparative examples were printed on a Hewlett-Packard ink jet printer with a color ink cartridge at 50% RH and 22°C. The samples were allowed to dry for about 15 minutes and then were placed in a plastic sleeve. The samples were stored in the plastic sleeve at 80% RH and 30°C for 72 hours. Blocking was judged by examining the size of the contact areas between the image and the sleeve and assigning a scaled score thereto (a score of 5 being the best and a score of 0 being the worst). The results are summarized in Table 1.
Table 1 Performance comparisons Smoothness Haze (%) (Sheffield Units) Blocking Example 1 2.5 33G 5 Example 2 2.7 341 5 Example 3 3.7 330 5 Example 4 1.7 373 5 Comparative Example 1 10.5 273 3 Comparative Example 2 8.9 193 0 The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention and all such modifications, as would be obvious to one skilled in the art, are intended to be included within the scope of the following claims.
Description of the related arts In order to achieve high color density and fidelity during ink jet printing on an ink receiving sheet, the laydown of the ink receiving sheet is usually high.
However, current commercial ink receiving sheets, in particular transparent ink receiving sheet, do no allow high ink laydown because of blocking between image that is formed on the ink receiving sheet and any materials that may come into contact with the image. In other words, because of the nature of the ink and the ink receiving sheet, ink undesirably transfers from the ink receiving sheet to materials in contact with the ink receiving sheet. The blocking has become one of the major problems in the field, particularly with high speed ink jet printers.
There have been many attempts in improving anti-blocking performance of ink receiving sheets. A number of designs have been proposed for use in various ink receiving sheets. Iqbal et al., US Patent 4,935,307, discloses an ink permeable protective layer containing a particulate material; Desjarlais, US Patent 4,775,594, discloses use of silica as an anti-blocking agent; Light, US Patent 5,084,338, discusses inert particles having a particle size of 25 pm or less; Bedell, US
Patent 4,547,405, also discusses use of particles such as glass beads in the ink receiving sheet. Although these proposals disclose use of particles, none of them have specified three key functional parameters: particle size distribution, particle size limitation and refractive index. Desired anti-blocking property and clarity only can be achieved when the particle size, particle size distribution and refractive index are optimized. When the particle size is too small, the particles do not pretrude through the ink receiving coating and anti-clocking property is poor. When the particles are too large, the particles will be projected when the ink receiving sheet is used as a transparency for presentation. In addition, the difference in refractive indices between the particle and the ink receiving coating affects the clarity and projection quality. Obviously, the solutions proposed in the prior arts do not solve the problems in the field. These designs have to compromise anti-blocking properties and clarity.
As a result, an undesirable compromise must be made between ink laydown and anti-blocking property.
The present invention discloses an optimized design that offers both excellent anti-blocking property and high clarity of the ink receiving sheet.
Summary of the invention An object of the present invention is to provide a transparent ink receiving sheet which will avoid the blocking problems associated with prior art ink receiving sheets, while still maintaining high ink laydown and clarity.
Another object of the present invention is to provide an ink receptive coating for an ink receiving sheet which will impart anti-blocking properties without the need for a separate ink permeable protective coating, while still maintaining high ink laydown and good clarity.
A further object of the present invention is to provide an improved ink jet printing process for printing images on transparent ink jet receiving sheets, which avoids the problems associated with prior art processes.
These and other objects and advantages are obtained by the present invention, which presents a solution to the need for an anti-blocking clear ink receiving sheet. The improvements in anti-blocking property and clarity are attained, according to the invention, by using specific particulates as a spacer in the ink receiving sheet.
More particularly, the objects and advantages of the present invention are obtained by an ink receiving sheet having anti-blocking properties, comprising a) a polymer substrate, b) an ink receptive coating disposed on at least one side of the substrate, and comprising at least one layer which comprises a water-soluble component, c) particulates dispersed in said ink receptive coating, having an average particle size of from about 15 Nm to about 50 Irm, preferably from about 20 Nm to about 40 Nm and a particle size span is equal to or smaller than 1.0, preferably <
0.8, and d) particulates dispersed in said ink receptive coating having a refractive index of from about 1.2 to about 2.4, wherein the ink receptive coating has a surface through which said particulates are exposed.
The objects and advantages of the present invention are also obtained by an ink receptive coating for an ink receiving sheet, comprising 1 ) at least one layer comprising a water-soluble component, and 2) particulates dispersed therein having an average particle size of from 15 Nm to about 50 Nm, a particle size span is equal to or smaller than 1.0 and a refractive index of from 1.2 to about 2.4, wherein this coating has a surface through which the particulates are exposed.
~154~~6 Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while they may indicated preferred embodiments of the invention, are given by way of illustration only, since various change and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
Detailed description of the invention Examples of suitable substrate for the ink receiving sheet include transparent plastics, such as polyethylene terephthalate), polycarbonate, polystyrene, cellulose 1o esters, polyvinyl acetate), and others. The thickness of the substrate is not particularly restricted, but should be in the range of about 1.5 to about 10 mils, preferably about 2.0 to about 5.0 mils. The substrates may be pretreated to enhance adhesion of the coatings thereto. The ink receptive coating, which is disposed on at least one side of the polymer substrate, contains at least one layer comprising at ~ 5 least one water-soluble component. The ink receptive coating may have a single layer structure, or may have multiple layers. When multiple layers are present, the particulates can reside in any of these layers, as long as the particulates are exposed on the surface of the ink receptive coating.
The ink receptive coating may contain both water-soluble and water-insoluble 2o components, as long as the ink receptive coating functions to receive ink.
Examples of water-soluble components include polyvinyl alcohol), polyvinyl acetate), polyvinyl pyrrolidone), poly(acrylic acid), cellulose esters, gelatins, proteins, polyethylene oxide), alginates, polyethylene glycol) and water-soluble gums.
Examples of water-insoluble components include methyl methacrylate, styrene, 25 urethane, butadiene, 2-hydroxyethyl acrylate, ethyl acrylate, N-hydroxyethyl acrylamide, N-hydroxymethyl acrylamide, and ethylene terephthalate. These water-soluble and water-insoluble components may be incorporated as the component of a homopolymer, a copolymer, or a polymer blend. The coating weight of the ink receptive coating may be from about 2 g/m2 to about 30 g/m2 and preferably, from 30 about 4 g/m2 to about 20 g/m2.
The particulates disclosed in this invention have an average particle size of from 15 Nm to about 50 Nm, preferably from about 20 Nm to about 40 Nm; a particle size span is equal to or smaller than 1.0, preferably ~ 0.8; and a refractive index of from about 1.2 to about 2.4. Examples of the particulates include glass beads, 35 poly(methyl methacrylate), polystyrene, starch, silica, polyurethane, calcium carbonate and other organic and inorganic particles specified particle size, particle size span and refractive index.
The concentration of the particulates in the ink receiving sheet may be from ~~1 ~~~16 about 0.5% to about 10% (weight percentage based on coating solid content), depending on the particle size, the particle size distribution and ink laydown.
Usually, low concentration is required when large particulates having small particle size span are used.
The smoothness of the ink receiving sheet disclosed in this invention may be from about 200 to about 400 Sheffield units, preferably from about 240 to about 360 Sheffield units. The haze of the ink receiving sheet is < 8%. The Sheffield smoothness was measured on Paper Smoothness Tester, model 538 (Hagerty Technologies). The haze was measured on Haze Guard System, XL-211 (BKY
Gardner). The average particle size and the particle size distribution ware measured on MasterSizer, MS-20 (Malvern Instruments). The average particle size is defined by the mean particle size or D50. The particle size distribution is expressed by the particle size span, which is defined as:
Particle Size Span = (D90-D10)/(D50) where D90 is the 90th percentile diameter, D10 is the 10th percentile diameter, and D50 is the 50th percentile diameter.
When the ink receptive coating is one side of the substrate, the side of the substrate which is not covered with ink receptive coating may to a backing material in order to reduce electrostatic charge and to reduce sheet-to-sheet friction and 2o sticking. The backing material may be either a polymer coating, an ink receptive coating, a polymer film, or paper, in accordance with what is known in the art, and is not particularly limited. To prevent stacking blocking, the particulates disclosed in this invention can also be added in the backing materials.
Any of a number of art recognized coating methods may be employed to coat the ink receptive coating onto the polymer substrate, such as roller coating, wire-bar coating, dip coating, extrusion coating, air knife coating, curtain coating, slide coating, doctor coating, or gravure coating. Such techniques are well known in the art.
The following examples are merely illustrative of the invention and are not to 3o be construed as limiting the invention.
Example 1 Underlayer PVP-K90' 12.0 parts Copolymer A2 7.5 parts Particulate 13 0.3 parts Dowanol PM4 17.3 parts MEK 61.4 parts Surface layer Hydroxyethyl cellulose5 1.8 parts Water 97.7 parts ~1~~4~16 ' Poly(vinyl pyrrolidone), GAF Corporation A copolymer of methyl methacrylate and hydroxyethyl methacrylate, 40% solid Glass bead, the average particle size is about 22 Nm, the particle size span is about 0.72 and the refractive index is about 1.65 (from the supplier) 5 4 Propylene glycol monomethyl ether, Dow Chemical Corporation Hydroxyethyl cellulose, Union Carbide The underlayer coating was coated on the polyester base using a No. 36 Meyer rod. After drying the underlayer coating at 120°C for about 2 minutes, the surface layer coating was coated using No. 8 Meyer rod under the same conditions.
The dry coat weight of the ink receptive coating is about 10 g/m2.
Example 2 Underlayer PVP-K90 9.6 parts Copolymer A 6.0 parts Quaternary copolymer' 8.6 parts Particulate I 0.3 parts Dowanol PM 16.3 parts MEK 57.7 parts Surface layer Hydroxyethyl cellulose 1.8 parts Water 97.7 parts ' Quaternary copolymer of methyl methacrylate and dimethylaminoethyl methacrylate, 35% solid The underlayer coating was coated on the polyester baseusing a No. 36 Meyer rod. After drying the underlayer coating at 120°C for about 2 minutes, the surface layer coating was coated using a No. 8 Meyer rod under the same conditions. The dry coat weight of the ink receptive coating is about 10 g/m2.
Example 3 Underlayer PVP-K90 12.0 parts Copolymer A 7.5 parts Particulate II' 0.3 parts Dowanol PM 17.3 parts MEK 61.4 parts Surface layer Hydroxyethyl cellulose 1.8 parts Water 97.7 parts ' Poly(methyl methacrylate), the average particle size is about 28 pm, the particle size span is about 0.65 and the refractive index is about 1.49 (from J.
Brandup &
E.H. Immergut, Polymer Handbook, third edition, John wily & Sons, 1989) The underlayer coating was coated on the polyester base using No. 38 Meyer rod. After drying the underlayer coating at 120°C for about 2 minutes, the surface I5:~~16 layer coating was coated using a No. 8 Meyer rod under the same conditions.
The dry coat weight of the ink receptive coating is about 10 g/m2.
Example 4 Underlayer PVP-K90 8.4 parts Copolymer B' 8.4 parts Quaternary copolymer 9.8 parts Particulate IIIZ 0.2 parts Dowanol PM 13.5 parts MEK 58.1 parts 1o Surface layer Hydroxyethyl cellulose 1.8 parts Water 97.7 parts ' A graft copolymer of methylmethacrylate and hydroxyethyl methacrylate, 25%
solid Glass bead, the average particle size is about 41 Irm, the particle size span is about 0.3 and the refractive index is about 1.51 (fram the supplier) The underlayer coating was coated on the polyester base using a No. 46 Meyer rod. After drying the underlayer coating at 120°C for about 2 minutes, the surface layer coating was coated using No. 8 Meyer rod under the same conditions.
The dry coat weight of the ink receptive coating is about 10 g/m2.
Comparative Example 1 Underlayer PVP-K90 8.67 parts Copolymer A 5.42 parts Quaternary copolymer 10.1 parts Dowanol PM 20.7 parts MEK 53.5 parts Surface layer Hydroxyethyl cellulose 0.5 parts Particulate IV 0.14 parts Water 98.4 parts ' Poly(methyl methacrylate), the average particle size is about 18 arm, the particle size span is about 1.19 and the refractive index is about 1.49.
The underlayer coating was coated on the polyester base using a No. 46 Meyer rod. After drying the underlayer coating at 120°C for about 2 minutes, the surface layer coating was coated using a No. 16 Meyer rod under the same conditions. The dry coat weight of the ink receptive coating is about 10 g/m2.
Comparative Example 2 Underlayer PVP-K90 8.7 parts Copolymer B 8.7 parts Quaternary copolymer 10.1 parts TW_132 Particulate V' 0.4 parts Dowanol PM 20.7 parts MEK 50.0 parts Surface layer Hydroxyethyl cellulose 1.8 parts Water 97.7 parts ' Corn starch, the average particle size is about 15 Nm, the particle size span is about 1.05 and the refractive index is about 1.52 (from Kirk-Othmer Encyclopedia of Chemical Technology, second edition, Volume 18, John Wiley & Sons, 1969) The underlayer coating was coated on the polyester base using a No. 46 Meyer rod. After drying the underlayer coating at 120°C for about 2 minutes, the surface layer coating was coated using a No. 8 Meyer rod under the same conditions. The dry coat weight of the ink receptive coating is about 10 g/m2.
Samples prepared according to the above examples and comparative examples were printed on a Hewlett-Packard ink jet printer with a color ink cartridge at 50% RH and 22°C. The samples were allowed to dry for about 15 minutes and then were placed in a plastic sleeve. The samples were stored in the plastic sleeve at 80% RH and 30°C for 72 hours. Blocking was judged by examining the size of the contact areas between the image and the sleeve and assigning a scaled score thereto (a score of 5 being the best and a score of 0 being the worst). The results are summarized in Table 1.
Table 1 Performance comparisons Smoothness Haze (%) (Sheffield Units) Blocking Example 1 2.5 33G 5 Example 2 2.7 341 5 Example 3 3.7 330 5 Example 4 1.7 373 5 Comparative Example 1 10.5 273 3 Comparative Example 2 8.9 193 0 The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention and all such modifications, as would be obvious to one skilled in the art, are intended to be included within the scope of the following claims.
Claims (17)
1. A transparent ink-receiving sheet having anti-blocking properties, comprising:
(a) a polymer substrate;
(b) an ink-receptive coating disposed on at least one side of said substrate, comprising at least one layer which comprises a water-soluble component;
and (c) particulates dispersed in said ink-receptive coating, having an average particle size of from about 15 um to about 50 um, a particle size span equal to or smaller than 1.0 and a refractive index of from about 1.2 to about 2.4;
provided that the ink receptive coating is present in an amount of from about
(a) a polymer substrate;
(b) an ink-receptive coating disposed on at least one side of said substrate, comprising at least one layer which comprises a water-soluble component;
and (c) particulates dispersed in said ink-receptive coating, having an average particle size of from about 15 um to about 50 um, a particle size span equal to or smaller than 1.0 and a refractive index of from about 1.2 to about 2.4;
provided that the ink receptive coating is present in an amount of from about
2 g/m2 to about 30 g/m2.
2. The ink receiving sheet according to claim 1, wherein said ink receptive coating is present in an amount of from about 4 g/m2 to about 20 g/m2.
2. The ink receiving sheet according to claim 1, wherein said ink receptive coating is present in an amount of from about 4 g/m2 to about 20 g/m2.
3. The ink receiving sheet according to claim 1, having a Sheffield smoothness of from about 200 to about 400.
4. The ink receiving sheet according to claim 3, wherein said Sheffield is from about 240 to about 360.
5. The ink receiving sheet according to claim 1, having a haze of less than 8%.
6. The ink receiving sheet according to claim 1, wherein said ink receptive coating comprises multiple layers.
7. The ink receiving sheet according to claim 1, wherein said water-soluble component is selected from the group consisting of poly(vinyl alcohol), poly(vinyl pyrrolidone), gelatin, poly(vinyl acetate), cellulose ester, poly(acrylic acid), alginate, protein, poly(ethylene oxide), poly(ethylene glycol), water soluble gum, and mixtures thereof.
8. The ink receiving sheet according to claim 1, wherein said particulates are selected from the group consisting of glass beads, silica, polyolefins, polystyrene, poly(methyl methacrylate), starch and calcium carbonate.
9. The ink receiving sheet according to claim 1, wherein the concentration of particulates is about 0.5% to about 10%.
10. The ink receiving sheet according to claim 1, wherein said substrate has a thickness of about 1.5 to about 5 mils.
11. The ink receiving sheet according to claim 10, wherein said thickness is about 2.0 to about 5.0 mils.
12. The ink receiving sheet according to claim 1, wherein said polymer substrate is a transparent plastic selected from the group consisting of polyester, polycarbonate, polystyrene, cellulose ester, poly(vinyl acetate), and mixtures thereof.
13. A process for ink jet printing, comprising applying liquid ink to the ink receptive coating of the ink receiving sheet according to claim 1.
14. A transparent ink-receiving sheet as recited in claim 1, wherein said particulates comprise poly(methylmethacrylate).
15. A transparent ink-receiving sheet as recited in claim 1, wherein said particulates comprise glass beads.
16. A transparent ink-receiving sheet having anti-blocking properties, comprising:
(a) a polymer substrate;
(b) an ink-receptive coating disposed on at least one side of said substrate, comprising at least one layer which comprises a water-soluble component;
and (c) polymeric particulates dispersed in said ink-receptive coating, having an average particle size of from about 15 um to about 50 um, a particle size span equal to or smaller than 1.0 and a refractive index of from about 1.2 to about 2.4;
provided that the ink receptive coating is present in an amount of from about g/m2 to about 30 g/m2.
(a) a polymer substrate;
(b) an ink-receptive coating disposed on at least one side of said substrate, comprising at least one layer which comprises a water-soluble component;
and (c) polymeric particulates dispersed in said ink-receptive coating, having an average particle size of from about 15 um to about 50 um, a particle size span equal to or smaller than 1.0 and a refractive index of from about 1.2 to about 2.4;
provided that the ink receptive coating is present in an amount of from about g/m2 to about 30 g/m2.
17. A transparent ink-receiving sheet having anti-blocking properties, comprising:
(a) a polymer substrate;
(b) an ink-receptive coating disposed on at least one side of said substrate, comprising at least one layer which comprises a water-soluble component;
and (c) organic particulates dispersed in said ink-receptive coating, having an average particle size of from about 15 um to about 50 um, a particle size span equal to or smaller than 1.0 and a refractive index of from about 1.2 to about 2.4;
provided that the ink receptive coating is present in an amount of from about g/m2 to about 30 g/m2.
(a) a polymer substrate;
(b) an ink-receptive coating disposed on at least one side of said substrate, comprising at least one layer which comprises a water-soluble component;
and (c) organic particulates dispersed in said ink-receptive coating, having an average particle size of from about 15 um to about 50 um, a particle size span equal to or smaller than 1.0 and a refractive index of from about 1.2 to about 2.4;
provided that the ink receptive coating is present in an amount of from about g/m2 to about 30 g/m2.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/274,720 US5714245A (en) | 1994-07-18 | 1994-07-18 | Anti-blocking clear ink receiving sheet |
US08/274,720 | 1994-07-18 |
Publications (2)
Publication Number | Publication Date |
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CA2154016A1 CA2154016A1 (en) | 1996-01-19 |
CA2154016C true CA2154016C (en) | 2005-06-28 |
Family
ID=23049346
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002154016A Expired - Fee Related CA2154016C (en) | 1994-07-18 | 1995-07-17 | Anti-blocking clear ink receiving sheet |
Country Status (5)
Country | Link |
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US (1) | US5714245A (en) |
EP (1) | EP0698502B1 (en) |
JP (1) | JP2760961B2 (en) |
CA (1) | CA2154016C (en) |
DE (1) | DE69523240T2 (en) |
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---|---|---|---|---|
MY129788A (en) | 1996-01-25 | 2007-04-30 | Innovia Films Ltd | Printable film. |
US6180256B1 (en) * | 1997-08-26 | 2001-01-30 | Arkwright Incorporated | Heat shrinkable ink jet recording medium |
US5985437A (en) * | 1997-12-04 | 1999-11-16 | E. I. Du Pont De Nemours And Company | Interdraw pretreatment for polyester film |
US6060156A (en) * | 1998-03-30 | 2000-05-09 | E. I. Du Pont De Nemours And Company | Porous alumina and partially calcined polysiloxane particles in interdraw coating resins for polyester film |
JP2000135859A (en) | 1998-06-30 | 2000-05-16 | Hiraoka & Co Ltd | Film material for advertising |
US6183844B1 (en) | 1998-12-16 | 2001-02-06 | Hewlett-Packard Company | Inkjet printing medium comprising multiple coatings |
AU6408100A (en) * | 1999-04-07 | 2000-10-23 | Kimberly-Clark Worldwide, Inc. | Coating composition containing beads and articles of manufact ure containing the same |
US6139210A (en) * | 1999-06-17 | 2000-10-31 | Eastman Kodak Company | Photographic holder assembly and album |
US6316081B1 (en) | 1999-06-17 | 2001-11-13 | Eastman Kodak Company | Photographic jacket and album |
US6458449B1 (en) | 1999-09-15 | 2002-10-01 | Hazen Paper Company | Inkjet printable holographic paper |
US6361853B1 (en) | 1999-12-20 | 2002-03-26 | Eastman Kodak Company | Ink jet recording element |
US6482883B1 (en) | 2000-05-10 | 2002-11-19 | Kanzaki Specialty Papers, Inc. | Ink jet recording material demonstrating a balance of properties including improved imaging performance and good water resistance |
US6431448B1 (en) | 2000-05-11 | 2002-08-13 | Eastman Kodak Company | Keyed data-and-print album page |
US6514600B1 (en) | 2000-05-18 | 2003-02-04 | Isp Investments Inc. | Color inkjet receptive films having long term light stability |
US6858293B2 (en) * | 2002-03-22 | 2005-02-22 | Eastman Kodak Company | Cellulose film with anti-blocking properties |
US7597956B2 (en) * | 2002-03-22 | 2009-10-06 | Eastman Kodak Company | Method of manufacture of a polymeric film with anti-blocking properties |
US7392075B2 (en) * | 2005-03-03 | 2008-06-24 | Nellcor Puritan Bennett Incorporated | Method for enhancing pulse oximetry calculations in the presence of correlated artifacts |
US20070196623A1 (en) * | 2006-02-21 | 2007-08-23 | Avery Dennison Corporation | Laser or ink jet printable sheet assembly |
US8728059B2 (en) * | 2006-09-29 | 2014-05-20 | Covidien Lp | System and method for assuring validity of monitoring parameter in combination with a therapeutic device |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4592951A (en) * | 1984-07-18 | 1986-06-03 | Polaroid Corporation | Ink jet recording sheet |
US4547405A (en) | 1984-12-13 | 1985-10-15 | Polaroid Corporation | Ink jet transparency |
GB2187137B (en) * | 1986-02-07 | 1990-10-17 | Canon Kk | Recording medium and recording method which makes use thereof |
US4775594A (en) * | 1986-06-20 | 1988-10-04 | James River Graphics, Inc. | Ink jet transparency with improved wetting properties |
JPS63125386A (en) * | 1986-11-14 | 1988-05-28 | Asahi Glass Co Ltd | Recording sheet |
US4935307A (en) * | 1988-10-21 | 1990-06-19 | Minnesota Mining And Manufacturing Company | Transparent coatings for graphics applications |
US5139868A (en) * | 1989-01-27 | 1992-08-18 | Canon Kabushiki Kaisha | Recording medium and image forming method making use of it |
JP3184836B2 (en) * | 1990-08-03 | 2001-07-09 | 日清紡績株式会社 | Inkjet recording sheet |
US5084338A (en) * | 1990-12-03 | 1992-01-28 | Eastman Kodak Company | Transparent image-recording elements containing ink-receptive layers |
US5139867A (en) * | 1991-08-30 | 1992-08-18 | Eastman Kodak Company | Ink jet recording transparency |
US5206071A (en) * | 1991-11-27 | 1993-04-27 | Arkwright Incorporated | Archivable ink jet recording media |
IT1263807B (en) * | 1992-01-24 | 1996-09-03 | Mizusawa Industrial Chem | SPHERICAL GRANULES OF POROUS SILICA OR POROUS SILICATE, PROCEDURE FOR THEIR PRODUCTION AND USE |
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1994
- 1994-07-18 US US08/274,720 patent/US5714245A/en not_active Expired - Lifetime
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1995
- 1995-06-19 DE DE69523240T patent/DE69523240T2/en not_active Expired - Fee Related
- 1995-06-19 EP EP95201650A patent/EP0698502B1/en not_active Expired - Lifetime
- 1995-07-13 JP JP7177802A patent/JP2760961B2/en not_active Expired - Fee Related
- 1995-07-17 CA CA002154016A patent/CA2154016C/en not_active Expired - Fee Related
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CA2154016A1 (en) | 1996-01-19 |
US5714245A (en) | 1998-02-03 |
DE69523240T2 (en) | 2002-06-27 |
JPH0852937A (en) | 1996-02-27 |
JP2760961B2 (en) | 1998-06-04 |
EP0698502B1 (en) | 2001-10-17 |
EP0698502A1 (en) | 1996-02-28 |
DE69523240D1 (en) | 2001-11-22 |
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