US2004229063A1PendingUtilityA1

Burnish resistant printing sheets

31
Assignee: S D WARREN SERVICES COMPANY APriority: Mar 15, 2002Filed: Jun 23, 2004Published: Nov 18, 2004
Est. expiryMar 15, 2022(expired)· nominal 20-yr term from priority
Inventors:Paul ConcannonPaul DurocherJoseph M. FernandezLisa GubrudThomas A. Waecker
Y10T428/24983Y10T428/3188Y10T428/31935Y10T428/31931B41M 5/52Y10T428/24893B41M 5/00Y10T428/2982Y10T428/24942Y10T428/254Y10T428/27Y10T428/31938B41M 5/5254Y10T428/24355Y10T428/31855B41M 5/5281Y10T428/25Y10T428/31971B41M 5/5272Y10T428/31975B41M 5/5236B41M 5/5218
31
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Claims

Abstract

A coated printing sheet is provided that is suitable for conventional offset printing grades, exhibiting desirable surface and optical properties and providing a surface that is image receptive and resistant to coating failure. The coated printing sheet includes an image receptive coating containing a hard polymer pigment having a shear modulus of at least 5.0×10 9 dynes/cm 2 and a film forming binder. The coated printing sheets resist burnishing and exhibit desirable properties, e.g., gloss, bulk, stiffness and smoothness, with minimal or no calendering.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 - 27 . (cancelled).  
     
     
         28 . A method of manufacturing a printing sheet comprising: 
 a) applying an image receptive coating, comprising a hard polymer pigment having a shear modulus of at least 5.0×10 9  dynes/cm 2  and a film forming binder, to at least a first surface of a substrate; and    b) drying the image receptive coating layer.    
     
     
         29 . A method of  claim 28  wherein the hard polymer pigment has a shear modulus of at least 10.0×10 9  dynes/cm 2 .  
     
     
         30 . A method of  claim 28  wherein a pressing step is performed on the substrate before the image receptive coating application step at a moisture level ranging from 20 to 60% and at a temperature of at least 100° C.  
     
     
         31 . A method of  claim 28  wherein the substrate, prior to application of the image receptive coating, has a smoothness of less than about 3.5 μm.  
     
     
         32 . A method of  claim 31  wherein the smoothness of the substrate is less than about 2.0 μm.  
     
     
         33 . A method of  claim 32  wherein the smoothness of the substrate is less than about 1.5 μm.  
     
     
         34 . A method of  claim 28  wherein a precoat layer application step and a precoat layer drying step are performed before the image receptive coating application step.  
     
     
         35 . A method of  claim 34  wherein the precoat layer comprises a binder and a pigment selected from the group consisting of kaolin, calcined clay, structured clay, ground calcium carbonate, precipitated calcium carbonate, titanium dioxide, aluminum trihydrate, satin white, hollow sphere plastic pigment, solid plastic pigment, silica, zinc oxide, barium sulfate and mixtures thereof.  
     
     
         36 . A method of  claim 35  wherein the pigment has a monodisperse particle size distribution.  
     
     
         37 . A method of  claim 36  wherein the monodisperse pigment is selected from the group consisting of precipitated calcium carbonate, hollow sphere plastic pigment and mixtures thereof.  
     
     
         38 . A method of  claim 34  wherein the precoat layer has a total dried coat weight per side of about 5 to 15 g/m 2 .  
     
     
         39 . A method of  claim 28  or  34  wherein a calendering step is performed before the image receptive coating application step.  
     
     
         40 . A method of  claim 28  wherein a calendering step is performed after the image receptive coating drying step.  
     
     
         41 . A method of  claim 40  wherein the calendering step is performed at a nip pressure of less than 90 kN/m.  
     
     
         42 . A method of  claim 41  wherein the calendering step is performed at a paper surface temperature of at least 5° C. lower than the glass transition temperature of the hard polymer pigment.  
     
     
         43 . A method of  claim 28  wherein a brushing step is performed after the image receptive coating drying step.  
     
     
         44 . (canceled)  
     
     
         45 . A method of  claim 28  wherein the hard polymer pigment is essentially non-film forming and remains in a form of discrete roughly spherical solid particles in the image receptive coating layer.  
     
     
         46 . A method of  claim 28  wherein the hard polymer pigment exhibits a glass transition temperature of at least 80° C.  
     
     
         47 . A method of  claim 28  wherein the hard polymer pigment is selected from the group consisting of poly(methyl methacrylate), poly(2-chloroethyl methacrylate), poly(isopropyl methacrylate), poly(phenyl methacrylate), polyacrylonitrile, polymethacrylonitrile, polycarbonates, polyetheretherketones, polyimides, acetals, polyphenylene sulfides, phenolic resins, melamine resins, urea resins, epoxy resins, and alloys, blends, mixtures and derivatives thereof.  
     
     
         48 . A method of  claim 47  wherein the hard polymer pigment has a homogenous composition comprising poly(methyl methacrylate) particles.  
     
     
         49 . A method of  claim 28  wherein the hard polymer pigment particles have a particle size of less than about 2,000 angstroms (Å).  
     
     
         50 . A method of  claim 28  wherein the image receptive coating comprises at least 30 parts by weight of the hard polymer pigment, based on 100 parts by weight of total pigment.  
     
     
         51 . A method of  claim 50  wherein the image receptive coating comprises at least 80 parts by weight of the polymer pigment, based on 100 parts by weight of total pigment.  
     
     
         52 . A method of  claim 28  wherein the film forming binder is selected from the group consisting of latex, starch, polyacrylate salt, polyvinyl alcohol, soy, casein, carboxymethyl cellulose, hydroxymethyl cellulose and mixtures thereof.  
     
     
         53 . A method of  claim 28  wherein the image receptive coating further comprises a pigment selected from the group consisting of structured polymer pigment, kaolin, calcined clay, structured clay, ground calcium carbonate, precipitated calcium carbonate, titanium dioxide, aluminum trihydrate, satin white, hollow sphere plastic pigment, solid plastic pigment, silica, zinc oxide, barium sulfate and mixtures thereof.  
     
     
         54 . A method of  claim 53  wherein the image receptive coating further comprises structured polymer pigment consisting of a soft domain having a glass transition temperature of less than about 50° C. and a hard domain having a glass transition temperature of greater than about 55° C.  
     
     
         55 . A method of  claim 28  wherein the image receptive coating has a total dried coat weight per side of about 1 to 4 g/m 2 .

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