WO2002020259A1 - Composition for protecting work surfaces from contamination - Google Patents

Composition for protecting work surfaces from contamination Download PDF

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Publication number
WO2002020259A1
WO2002020259A1 PCT/US2001/027231 US0127231W WO0220259A1 WO 2002020259 A1 WO2002020259 A1 WO 2002020259A1 US 0127231 W US0127231 W US 0127231W WO 0220259 A1 WO0220259 A1 WO 0220259A1
Authority
WO
WIPO (PCT)
Prior art keywords
absorbent layer
layer
protective covering
absorbent
hydrophobic
Prior art date
Application number
PCT/US2001/027231
Other languages
French (fr)
Other versions
WO2002020259A8 (en
Inventor
Calvin B. Ward
Original Assignee
Ward Calvin B
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 Ward Calvin B filed Critical Ward Calvin B
Priority to AU2001287002A priority Critical patent/AU2001287002A1/en
Publication of WO2002020259A1 publication Critical patent/WO2002020259A1/en
Publication of WO2002020259A8 publication Critical patent/WO2002020259A8/en

Links

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/04—Treating liquids
    • G21F9/06—Processing
    • G21F9/12—Processing by absorption; by adsorption; by ion-exchange
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M23/00—Treatment of fibres, threads, yarns, fabrics or fibrous goods made from such materials, characterised by the process
    • D06M23/16—Processes for the non-uniform application of treating agents, e.g. one-sided treatment; Differential treatment
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0043—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by their foraminous structure; Characteristics of the foamed layer or of cellular layers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2205/00—Condition, form or state of the materials
    • D06N2205/04—Foam
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2209/00—Properties of the materials
    • D06N2209/14—Properties of the materials having chemical properties
    • D06N2209/142—Hydrophobic
    • 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.]
    • Y10T428/2419—Fold at edge
    • Y10T428/24215—Acute or reverse fold of exterior component
    • Y10T428/24231—At opposed marginal edges
    • Y10T428/2424—Annular cover
    • Y10T428/24248—One piece
    • Y10T428/24256—Abutted or lapped seam
    • 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
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    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24744—Longitudinal or transverse tubular cavity or cell
    • 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
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    • 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
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    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, 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
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    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249955—Void-containing component partially impregnated with adjacent component
    • Y10T428/249959—Void-containing component is wood or paper
    • 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
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249962—Void-containing component has a continuous matrix of fibers only [e.g., porous paper, 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
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249962—Void-containing component has a continuous matrix of fibers only [e.g., porous paper, etc.]
    • Y10T428/249964—Fibers of defined composition
    • 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
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    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249962—Void-containing component has a continuous matrix of fibers only [e.g., porous paper, etc.]
    • Y10T428/249964—Fibers of defined composition
    • Y10T428/249965—Cellulosic
    • 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
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    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249978—Voids specified as micro
    • Y10T428/24998—Composite has more than two layers
    • 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
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    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249987—With nonvoid component of specified composition
    • 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
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    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249994—Composite having a component wherein a constituent is liquid or is contained within preformed walls [e.g., impregnant-filled, previously void containing component, 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
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2922—Nonlinear [e.g., crimped, coiled, etc.]
    • Y10T428/2924—Composite
    • 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
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    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y10T428/294—Coated or with bond, impregnation or core including metal or compound thereof [excluding glass, ceramic and asbestos]
    • Y10T428/2942—Plural coatings
    • Y10T428/2944—Free metal in 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
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/647—Including a foamed layer or component
    • 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
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    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/659—Including an additional nonwoven fabric
    • 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
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/659—Including an additional nonwoven fabric
    • Y10T442/664—Including a wood fiber containing layer

Definitions

  • the present invention relates to electrically charged plastic sheets, and more particularly, to a self-adhering material for protecting surfaces from contamination.
  • the present invention is a protective covering constructed from an electrostatically charged sheet having a top and bottom surface and an absorbent layer.
  • the absorbent layer has top and bottom surfaces, the bottom surface of the absorbent layer being bonded to the top surface of the electrostatically charged sheet.
  • the absorbent layer is divided into a plurality of cells for containing liquid spilled on the absorbent layer.
  • the absorbent layer can be constructed from paper, open cell foam, a fibrous mat, or any other absorbent material.
  • the cells are constructed by providing hydrophobic barriers in the absorbent layer.
  • the barriers can be constructed from paraffin, plastic, or any other material that can penetrate the absorbent layer.
  • a hydrophobic layer is bonded to the top surface of the absorbent layer.
  • the hydrophobic layer has a plurality of pores that allow liquid spilled on the hydrophobic layer to penetrate the hydrophobic layer and be absorbed by the absorbent layer.
  • Figure 1 is a prospective view of a portion of a protective sheet 10 according to the present invention.
  • FIG. 2 is a perspective view of another embodiment 20 of the present invention in which the absorbent layer may be covered with a hydrophobic plastic layer that includes pores.
  • the present invention may be more easily understood with reference to Figure 1, which is a prospective view of a portion of a protective sheet 10 according to the present invention.
  • the present invention utilizes a sheet 11 of electrically charged material that is bonded to a layer 12 of absorbent material.
  • the electrically charged material is preferably a plastic that acts both as a moisture barrier and a means for securing the protective sheet to the work bench through electrostatic adhesion.
  • the layer of absorbent material is preferably divided into cells 14 by impregnating the material with a barrier material 13 in an appropriate pattern. The barriers prevent liquid trapped in a cell from seeping out of the cell, and hence, solve one of the problems discussed above.
  • the barriers can be constructed from any hydrophobic material that can be introduced into the absorbent material.
  • paraffin can be applied at an elevated temperature to introduce wax barriers.
  • varnish or other hydrophobic material can be introduced in an appropriate solvent which is then evaporated.
  • the electrostatically charged sheet is preferably a plastic such as a polyester, polycarbonate, or polypropylene.
  • Plastic sheets of these materials can be charged by placing the sheets in an electric field, which is typically 10,000 volts/cm. Methods for charging such sheets are well known to the art, and hence, will not be discussed in detail here.
  • the sheets may be heated during the charging process to increase the remnant electric field.
  • a polyester film having a thickness between O.OOlinches and 0.01 inches is passed between rollers and subjected to an electric field and corona discharge to charge the film. This film is then attached to the absorbent layer.
  • embodiments in which the film is attached to the absorbent layer before being subjected to the electric field and corona discharge can also be practiced.
  • the absorbent layer is preferably constructed from paper that has been impregnated with a hydrophobic material such as paraffin.
  • a hydrophobic material such as paraffin.
  • the stripped paper can be attached by applying an adhesive or by heating the two layers while pressing the layers together such that the hydrophobic material melts and acts as an adhesive.
  • the thickness of the paper will depend on the anticipated liquid loading and the absorbency of the paper. Paper compositions such as used in paper towels are suitable for most applications.
  • the absorbent layer can also be constructed from an open cell foam material or other absorbent material.
  • open cell foam material or other absorbent material.
  • thin sheets of plastic foam with an open cell structure can be used to provide a high-absorbency material.
  • the plastic foams that can also be charged electrically can also be advantageously utilized. Such foams will retain material electrostatically after the solution in which the material was dissolved has evaporated from the absorbent layer, and thus, prevent the remaining material from being lost as "dust".
  • the absorbent layer can be constructed from a fibrous mat such as used in air filters. If the fibers are formed from a plastic that can be charged, the mat can also be charged. Such electrostatically charged mats are well known in the air filter arts, and hence, will not be discussed further here.
  • FIG 2 is a perspective view of another embodiment 20 of the present invention in which the absorbent layer may be covered with a hydrophobic plastic layer 21 that includes pores 22.
  • the pores allow a liquid spilled on layer 21 to pass through to the absorbent material while leaving the surface of the protective sheet dry. Materials such as those used in disposable diapers may be utilized for the top layer.

Abstract

A protective covering (10) constructed from an electrostatically charged sheet (11) having a top and a bottom surface and an absorbent layer (12). The absorbent layer (12) has top and bottom surfaces, the bottom surface of the absorbent layer being bonded to the top surface of the electrostatically charged sheet (11). The absorbent layer (12) is divided into a plurality of cells from containing liquid spilled on the absorbent layer (12). The absorbent layer (12) can be constructed from paper, open cell foam, fibrous mat, or any other absorbent material (12). In the preferred embodiment of the present invention, the cells are constructed by providing hydrophobic barriers in the absorbent layer (12). The barriers can be constructed from paraffin, plastic or any other material that can penetrate the absorbent layer (12).

Description

Composition for Protecting Work Surfaces from Contamination
Field of the Invention
The present invention relates to electrically charged plastic sheets, and more particularly, to a self-adhering material for protecting surfaces from contamination.
Background of the Invention
In environments in which hazard materials such as organic solvents and radioactive materials are used, workbenches and the like are often covered with an absorbent disposable material to prevent the contamination of the workbench in the event of a spill. Protective materials that consist of an absorbent layer with a plastic backing to prevent liquid from reaching the underlying surface are well known in the art. Such materials are sold in rolls and are cut to the correct size at the laboratory. The material is then secured to the workbench with tape to prevent the material from slipping. After the material has served its purpose, the material is removed by peeling off the tape, and the material is discarded in the appropriate trash container.
This solution to the contamination problem has two problems. First, the time needed to secure the protective material to the workbench is significant and requires the installer to have a large supply of masking tape or the like. Second, if excessive liquid is released on the protective material, the absorbent layer becomes saturated, and the excess liquid can seep off of the sides of the material that are nearest to the saturated portion of the sheet before the operator can contain the spill and replace the protective layer.
Broadly, it is the object of the present invention to provide an improved protective material that can be applied to workbenches and the like.
It is a further object of the present invention to provide a protective material that is self-adhering, and hence, does not require tape or other adhesives. It is a still further object of the present invention to provide a protective material that is resistant to seepage from the edges.
These and other objects of the present invention will become apparent to those skilled in the art from the following detailed description of the invention and the accompanying drawings.
Summary of the Invention
The present invention is a protective covering constructed from an electrostatically charged sheet having a top and bottom surface and an absorbent layer. The absorbent layer has top and bottom surfaces, the bottom surface of the absorbent layer being bonded to the top surface of the electrostatically charged sheet. The absorbent layer is divided into a plurality of cells for containing liquid spilled on the absorbent layer. The absorbent layer can be constructed from paper, open cell foam, a fibrous mat, or any other absorbent material. In the preferred embodiment of the present invention, the cells are constructed by providing hydrophobic barriers in the absorbent layer. The barriers can be constructed from paraffin, plastic, or any other material that can penetrate the absorbent layer. In one embodiment of the present invention, a hydrophobic layer is bonded to the top surface of the absorbent layer. The hydrophobic layer has a plurality of pores that allow liquid spilled on the hydrophobic layer to penetrate the hydrophobic layer and be absorbed by the absorbent layer.
Brief Description of the Drawings
Figure 1 is a prospective view of a portion of a protective sheet 10 according to the present invention.
Figure 2 is a perspective view of another embodiment 20 of the present invention in which the absorbent layer may be covered with a hydrophobic plastic layer that includes pores. Detailed Description of the Invention
The present invention may be more easily understood with reference to Figure 1, which is a prospective view of a portion of a protective sheet 10 according to the present invention. The present invention utilizes a sheet 11 of electrically charged material that is bonded to a layer 12 of absorbent material. The electrically charged material is preferably a plastic that acts both as a moisture barrier and a means for securing the protective sheet to the work bench through electrostatic adhesion. The layer of absorbent material is preferably divided into cells 14 by impregnating the material with a barrier material 13 in an appropriate pattern. The barriers prevent liquid trapped in a cell from seeping out of the cell, and hence, solve one of the problems discussed above.
The barriers can be constructed from any hydrophobic material that can be introduced into the absorbent material. For example, paraffin can be applied at an elevated temperature to introduce wax barriers. Similarly, varnish or other hydrophobic material can be introduced in an appropriate solvent which is then evaporated.
The electrostatically charged sheet is preferably a plastic such as a polyester, polycarbonate, or polypropylene. Plastic sheets of these materials can be charged by placing the sheets in an electric field, which is typically 10,000 volts/cm. Methods for charging such sheets are well known to the art, and hence, will not be discussed in detail here. The sheets may be heated during the charging process to increase the remnant electric field. In the preferred embodiment of the present invention, a polyester film having a thickness between O.OOlinches and 0.01 inches is passed between rollers and subjected to an electric field and corona discharge to charge the film. This film is then attached to the absorbent layer. However, embodiments in which the film is attached to the absorbent layer before being subjected to the electric field and corona discharge can also be practiced.
The absorbent layer is preferably constructed from paper that has been impregnated with a hydrophobic material such as paraffin. When placed in contact with the plastic sheet, the stripped paper can be attached by applying an adhesive or by heating the two layers while pressing the layers together such that the hydrophobic material melts and acts as an adhesive. The thickness of the paper will depend on the anticipated liquid loading and the absorbency of the paper. Paper compositions such as used in paper towels are suitable for most applications.
The absorbent layer can also be constructed from an open cell foam material or other absorbent material. For example, thin sheets of plastic foam with an open cell structure can be used to provide a high-absorbency material. The plastic foams that can also be charged electrically can also be advantageously utilized. Such foams will retain material electrostatically after the solution in which the material was dissolved has evaporated from the absorbent layer, and thus, prevent the remaining material from being lost as "dust".
Similarly, the absorbent layer can be constructed from a fibrous mat such as used in air filters. If the fibers are formed from a plastic that can be charged, the mat can also be charged. Such electrostatically charged mats are well known in the air filter arts, and hence, will not be discussed further here.
Refer now to Figure 2, which is a perspective view of another embodiment 20 of the present invention in which the absorbent layer may be covered with a hydrophobic plastic layer 21 that includes pores 22. The pores allow a liquid spilled on layer 21 to pass through to the absorbent material while leaving the surface of the protective sheet dry. Materials such as those used in disposable diapers may be utilized for the top layer.
Various modifications to the present invention will become apparent to those skilled in the art from the foregoing description and accompanying drawings. Accordingly, the present invention is to be limited solely by the scope of the following claims.

Claims

WHAT IS CLAIMED IS:
1. A protective covering comprising:
an electrostatically charged sheet having a top and bottom surface; and
an absorbent layer having top and bottom surfaces, said bottom surface of said absorbent layer being bonded to said top surface of said electrostatically charged sheet, said absorbent layer being divided into a plurality of cells for containing liquid spilled on said absorbent layer.
2. The protective covering of Claim 1, wherein said absorbent layer comprises paper.
3. The protective covering of Claim 1, wherein said absorbent layer comprises an open cell foam.
4. The protective covering of Claim 3, wherein said foam is electrostatically charged.
5. The protective covering of Claim 1, wherein said absorbent layer comprises a fibrous mat.
6. The protective covering of Claim 5, wherein said fibrous mat is electrostatically charged.
7. The protective covering of Claim 1, wherein said absorbent layer comprises a plurality of hydrophobic barriers, said hydrophobic barriers defining said cells.
8. The protective covering of Claim 1 further comprising a hydrophobic layer bonded to said top surface of said absorbent layer, said hydrophobic layer having a plurality of pores therethrough, said pores allowing liquid spilled on said hydrophobic layer to penetrate said hydrophobic layer and be absorbed by said absorbent layer.
PCT/US2001/027231 2000-09-06 2001-08-31 Composition for protecting work surfaces from contamination WO2002020259A1 (en)

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WO2002020259A8 (en) 2002-08-01

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