WO2001087586A1 - Color inkjet receptive films having long term light stability - Google Patents

Color inkjet receptive films having long term light stability Download PDF

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Publication number
WO2001087586A1
WO2001087586A1 PCT/US2001/014239 US0114239W WO0187586A1 WO 2001087586 A1 WO2001087586 A1 WO 2001087586A1 US 0114239 W US0114239 W US 0114239W WO 0187586 A1 WO0187586 A1 WO 0187586A1
Authority
WO
WIPO (PCT)
Prior art keywords
ink
color
copolymer
receptive film
film according
Prior art date
Application number
PCT/US2001/014239
Other languages
French (fr)
Inventor
James A. Dougherty
John Mc Kittrick
Original Assignee
Isp Investments Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Isp Investments Inc. filed Critical Isp Investments Inc.
Priority to AU2001259398A priority Critical patent/AU2001259398A1/en
Publication of WO2001087586A1 publication Critical patent/WO2001087586A1/en

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Classifications

    • 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
    • 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.]
    • 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
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers

Definitions

  • This invention relates to color inkjet recording films, and, more particularly, to color-receptive films coated with copolymers of vinyl caprolactam and dimethylaminopropyl methyl acrylamide having excellent color stability towards light.
  • PVP brings many benefits to properly formulated media coatings including rapid ink dry time, excellent print quality, highly resolved circular dots, and high, uniform optical density. Furthermore, copolymers of vinylpyrrolidone (VP) along with other suitable comonomers, such as dimethylaminoethyl methacrylate, acrylic acid, or vinyl acetate, have been used separately or in conjunction with PVP, to further optimize performance. Unfortunately, ink-jet images printed on VP-based formulations are prone to fading with exposure to light. Increasing demands for achievable ink-jet images has created a need for polymers with all the positive attributes of vinyl pyrrolidone and with improved light stability.
  • the object of the invention is to provide a clear, white- appearance, water-resistant, color inkjet-receptive film coated with a polymer which provides the color image thereon with excellent, long-term color stability.
  • a clear white-appearance, water-resistant, color ink-receptive film having a copolymer of (a) vinyl caprolactam and (b) dimethylaminopropyl methacrylamide coated thereon; preferably the weight ratio of (a):(b) is 50-95:50-5; optimally about 80:20.
  • the ink-receptive film of the invention is capable of being printed from a color inkjet printer to form color images thereon which exhibit excellent long-term color stability towards light.
  • Coating formulations were prepared by dissolving the test copolymer in a suitable solvent at 10 wt.%. Drawdowns were cast on a polyester substrate using a #38 Mayer bar and allowed to dry overnight under ambient conditions to give a dry coating thickness of ⁇ 9 micron.
  • Coated samples were then printed using a selected printer. Individual blocks of cyan(C), magenta(M), yellow(Y), and black(K), approximately 1" X 1.75" in size, were printed side by side. Small blocks of C, M, Y, and K, approximately 1/8" x 1/4", are printed repeatedly down one edge of the page to provide a built-in time-line for measuring off-set time as described below.
  • Optical density was determined on blocks of cyan(C), magenta(M), yellow(Y), and black(K) using a Macbeth Densitometer. A large value for optical density is preferred.
  • Off-set time is the minimum time required for no ink to transfer to a cover sheet placed on top of the print when contacted with a 4-lb. Roller immediately after printing. Ink transfer is determined at the point where the OD after testing dropped by a value of 0.2 units. Fast off-set times are most desirable.
  • Light fastness is determined by measuring the change in optical density after 21 hours exposure to either a QUV or Atlas weatherometer. The results are given as a % change in optical density.
  • a 10 wt.% aqueous solution of a copolymer of vinyl caprolactam (VCL) and dimethylaminopropyl methacrylamide (DMAPMA) in the wt. ratio of VCL/DMAPMA of 80:20 was prepared according to the process described in U.S. Pat. 5,609,865 (ISP).
  • a coating was cast from the solution onto a polyester film. After drying overnight, the test sample was printed using a HP 722C printer at 600 DPI in "HP Premium Photo Paper" mode. Off-set time and optical density values were determined as described above. Fading was determined after 21 hours exposure (37800 KJ/M 2 ) to an Atlas Suntest cps+.
  • a coating was cast onto a polyester film from a 10 wt.% aqueous solution of a 50:50 wt.% copolymer of VCL/DMAPMA.
  • the sample was color- printed and the test properties were determined as in Example 1. The results are shown in Table 2 below.
  • test results demonstrate that copolymers based on VCL have improved light stability compared to VP-based copolymers with only a minimal penalty in off-set time.
  • VCL/DMAPMA 1.59 2.31 1.58 14 18 51 0.0 0.2 0.2 1.4 ⁇ i

Abstract

What is described herein is a clear white-appearance, water-resistant, color ink-receptive film having a copolymer of (a) vinyl caprolactam and (b) dimethylaminopropyl methacrylamide coated thereon; preferably the weight ratio of (a):(b) is 50-95:50-5; optimally about 80:20. The ink-receptive film of the invention is capable of being printed from a color inkjet printer to form color images thereon which exhibit excellent long-term color stability towards light. These advantageous results are achieved herein while retaining the desired properties of rapid ink dry time, good print quality, highly resolved circular dots, and high, uniform optical density, characteristic of other systems.

Description

COLOR INKJET RECEPTIVE FILMS HAVING LONG TERM LIGHT STABILITY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to color inkjet recording films, and, more particularly, to color-receptive films coated with copolymers of vinyl caprolactam and dimethylaminopropyl methyl acrylamide having excellent color stability towards light.
2. Description of the Prior Art
The advent of color inkjet printing has been instrumental in fueling the print-on-demand revolution and has also created a number of challenges. Often, the surface of the desired media does not possess the necessary properties for accepting the ink-jet ink. This results in long dry times and/or a poor ink-jet image. It has long been recognized that a surface treatment or media coating plays a critical role in the final print quality. Numerous media coatings are known in the art. They may contain any number of components and often consist of more than one layer. These ink-receptive coatings generally contain at least one hydrophilic polymer; often poly(vinylpyrrolidone) (PVP). PVP brings many benefits to properly formulated media coatings including rapid ink dry time, excellent print quality, highly resolved circular dots, and high, uniform optical density. Furthermore, copolymers of vinylpyrrolidone (VP) along with other suitable comonomers, such as dimethylaminoethyl methacrylate, acrylic acid, or vinyl acetate, have been used separately or in conjunction with PVP, to further optimize performance. Unfortunately, ink-jet images printed on VP-based formulations are prone to fading with exposure to light. Increasing demands for achievable ink-jet images has created a need for polymers with all the positive attributes of vinyl pyrrolidone and with improved light stability.
Accordingly, the object of the invention is to provide a clear, white- appearance, water-resistant, color inkjet-receptive film coated with a polymer which provides the color image thereon with excellent, long-term color stability.
SUMMARY OF THE INVENTION
What is described herein is a clear white-appearance, water-resistant, color ink-receptive film having a copolymer of (a) vinyl caprolactam and (b) dimethylaminopropyl methacrylamide coated thereon; preferably the weight ratio of (a):(b) is 50-95:50-5; optimally about 80:20. The ink-receptive film of the invention is capable of being printed from a color inkjet printer to form color images thereon which exhibit excellent long-term color stability towards light. These advantageous results are achieved herein while retaining the desired properties of rapid ink dry time, good print quality, highly resolved circular dots, and high, uniform optical density, characteristic of other systems.
DETAILED DESCRIPTION OF THE INVENTION Test Methods
Coating formulations were prepared by dissolving the test copolymer in a suitable solvent at 10 wt.%. Drawdowns were cast on a polyester substrate using a #38 Mayer bar and allowed to dry overnight under ambient conditions to give a dry coating thickness of ~9 micron.
Coated samples were then printed using a selected printer. Individual blocks of cyan(C), magenta(M), yellow(Y), and black(K), approximately 1" X 1.75" in size, were printed side by side. Small blocks of C, M, Y, and K, approximately 1/8" x 1/4", are printed repeatedly down one edge of the page to provide a built-in time-line for measuring off-set time as described below.
Optical density (OD) was determined on blocks of cyan(C), magenta(M), yellow(Y), and black(K) using a Macbeth Densitometer. A large value for optical density is preferred.
Off-set time is the minimum time required for no ink to transfer to a cover sheet placed on top of the print when contacted with a 4-lb. Roller immediately after printing. Ink transfer is determined at the point where the OD after testing dropped by a value of 0.2 units. Fast off-set times are most desirable.
Light fastness is determined by measuring the change in optical density after 21 hours exposure to either a QUV or Atlas weatherometer. The results are given as a % change in optical density.
EXAMPLE 1
A 10 wt.% aqueous solution of a copolymer of vinyl caprolactam (VCL) and dimethylaminopropyl methacrylamide (DMAPMA) in the wt. ratio of VCL/DMAPMA of 80:20 was prepared according to the process described in U.S. Pat. 5,609,865 (ISP). A coating was cast from the solution onto a polyester film. After drying overnight, the test sample was printed using a HP 722C printer at 600 DPI in "HP Premium Photo Paper" mode. Off-set time and optical density values were determined as described above. Fading was determined after 21 hours exposure (37800 KJ/M2) to an Atlas Suntest cps+.
A comparative test was run as above using STYLEZE® CC-10 (ISP), a vinyl pyrrolidone/dimethylaminopropyl methacrylamide copolymer.
The results of both tests, shown in Table 1 below establish that the VCL/DMAPMA copolymer exhibits superior and excellent long term light stability as compared to the VP-based copolymer. TABLE 1
Initial OD Initial OD Initial OD % Delta OD % Delta OD %Delta OD Offset Offset Mag. Offset Yel
Copolymer (C) m (Y) (C) fM Cyan (min) (min) (min)
CC-1 Q 1.37 2.26 1.91 31 59 61 O.Q 0.1 0.1
VCUDMAPMA 1.41 2.23 1.80 18 35 58 0.0 0.3 0.3 £»
EXAMPLE 2
A coating was cast onto a polyester film from a 10 wt.% aqueous solution of a 50:50 wt.% copolymer of VCL/DMAPMA. The sample was color- printed and the test properties were determined as in Example 1. The results are shown in Table 2 below.
The test results demonstrate that copolymers based on VCL have improved light stability compared to VP-based copolymers with only a minimal penalty in off-set time.
TABLE 2
Initial OD Initial OD Initial OD % Delta % Delta %Delta Offset Offset Mag. Offset Yei Offset Blk
Copolymer (C) {Ml CΩ OD (C) OD (M) OD (Y) Cyan (min) (min) (min) (min)
VP/DMAPMA 1.47 2.27 1.57 31 56 68 0.0 0.2 0.3 0.8
VCL/DMAPMA 1.59 2.31 1.58 14 18 51 0.0 0.2 0.2 1.4 σi

Claims

WHAT IS CLAIMED IS:
1. A clear white-appearance, water-resistant, color ink-receptive film having a copolymer of (a) vinyl caprolactam and (b) dimethylaminopropyl methacrylamide coated thereon.
2. An ink-receptive film according to claim 1 wherein the weight ratio of (a):(b) is 50-95:50-5.
3. An ink-receptive film according to claim 2 wherein said weight ratio is about 80:20.
4. An ink-receptive film according to claim 2 wherein said copolymer is applied from a dilute aqueous or aqueous-alcoholic solution of the copolymer.
5. An ink-receptive film according to claim 1 wherein said substrate is polyester.
6. An ink-receptive film according to claim 1 which is color-printed from a color ink-jet printer to form color images thereon which exhibit excellent long-term color stability towards light.
PCT/US2001/014239 2000-05-18 2001-05-01 Color inkjet receptive films having long term light stability WO2001087586A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001259398A AU2001259398A1 (en) 2000-05-18 2001-05-01 Color inkjet receptive films having long term light stability

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/573,805 2000-05-18
US09/573,805 US6514600B1 (en) 2000-05-18 2000-05-18 Color inkjet receptive films having long term light stability

Publications (1)

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WO2001087586A1 true WO2001087586A1 (en) 2001-11-22

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AU (1) AU2001259398A1 (en)
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Citations (4)

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US5609865A (en) * 1994-12-28 1997-03-11 Isp Investments Inc. Substantially homogeneous copolymers of vinyl pyrrolidone and N-3,3-dimethylaminopropyl methacrylamide for personal care applications
US5989650A (en) * 1996-04-04 1999-11-23 Canon Kabushiki Kaisha Recording medium, ink-jet recording method and printed product
US6225429B1 (en) * 1999-07-01 2001-05-01 Isp Investments Inc. Process for making vinyl caprolactam-based polymers

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US6225429B1 (en) * 1999-07-01 2001-05-01 Isp Investments Inc. Process for making vinyl caprolactam-based polymers

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AU2001259398A1 (en) 2001-11-26
US6514600B1 (en) 2003-02-04

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