Articles coated with electrophotographic toner receptive release coatings

• US 5,744,207 A
• Filed: 11/21/1996
• Issued: 04/28/1998
• Est. Priority Date: 03/31/1993
• Status: Expired due to Term

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Bartusiak, Joseph T., Kumar, Ramesh C., Kantner, Steven S., Mertens, Timothy A.
• Primary Examiner(s): Marquis, Melvyn I.
• Application Number:
  US08/752,821
• Time in Patent Office: 523 Days
• Field of Search: 428/447, 428/448, 428/452, 428/41.8
• US Class Current: 428/41.8
• CPC Class Codes: C08G 77/442 containing vinyl polymer sequences
• CPC Class Codes: G03G 7/008 being macromolecular
• CPC Class Codes: Y10T 428/1476 Release layer
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

An article that is capable of accepting and anchoring printed indicia and yet, maintains good release properties. The article of the present invention is coated with a release agent on a substrate such as paper. Release coatings receptive to toner particles emitted by electrophotoconductive devices comprise a polymer having at least one vinyl polymeric segment having a T_g between -10° C. and 65° C. and at least one siloxane polymeric segment.

Claims

1. An image receiving article comprising:

(a) a liner having a front face and a back face;

(b) a layer of release coating coated over a portion of the front face of a liner wherein the release coating comprising a polymer having at least one vinyl polymeric segment having a T_g between -10°

C. and 65°

C. present at a weight percent great enough to provide the copolymer with the capability of substantially anchoring toner particles emitted by an electrophotoconductive device and at least one siloxane polymeric segment having a number average molecular weight above about 100 and is present at a weight percent great enough to provide the copolymer with a surface release value not greater than about 11 Newtons/dm;

(c) a layer of pressure sensitive adhesive; and

(d) at least one layer of substrate having a front and a back face.

2. The image receiving article of claim 1 wherein said polymer of the release coating is a copolymer comprising having the formula:

##STR11## wherein R₁ are monovalent moieties which can independently be the same or different and are selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, hydroxyl, hydrogen, and fluoroalkyl;

R₂ can independently be the same or different and are divalent linking groups;

R₃ are monovalent moieties which can independently be the same or different and are selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, hydroxyl, hydrogen, and fluoroalkyl;

R₄ can independently be the same or different and are divalent linking groups;

x is an integer of 0-3;

y is an integer of 10 or greater;

q is an integer of 0-3 ; and

G₅ are monovalent moieties which can independently be the same or different selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, fluoralkyl, hydrogen, and -WSA;

A is a vinyl polymeric segment or block consisting essentially of polymerized free radically polymerized monomer;

G₆ are monovalent moieties which can independently be the same or different selected from the group consisting of alkyl, aryl, alkoxy, alkylamino, fluoroalkyl, hydrogen and -WSA; and

G₂ and G₄ are A.

3. The image receiving article of claim 1 wherein said polymer of the release coating is a copolymer of D and E monomers copolymerized to form a polymeric backbone with F monomer grafted thereto

wherein

D is at least one free radically polymerizable vinyl monomer;

E is at least one polar monomer copolymerizable with D, the amount of E being up to 30% of the total weight of all monomers, and

F is a monomer having the general formula

space="preserve" listing-type="equation">X--(Y).sub.n SiR.sub.(3-m) Z.sub.m wherein

X is a vinyl group copolymerizable with the D and E monomers,

Y is a divalent linking group where n is zero or 1;

m is an integer of from 1 to 3;

R is hydrogen, lower alkyl (e.g., methyl, ethyl, or propyl), aryl (e.g., phenyl or substituted phenyl), or alkoxy; and

Z is a monovalent siloxane polymeric moiety having a number average molecular weight above about 1,000 and is essentially unreactive under copolymerization conditions.

4. The image receiving article of claim 3 wherein said D monomer of the polymer of the release coating is selected from the group consisting of styrene, vinyl acetate, vinyl chloride, vinylidene chloride, acrylonitrile, acrylic or methacrylic acid esters of non-tertiary alcohols having from 1 to about 18 carbon atoms and mixtures thereof.

5. The image receiving article of claim 3 wherein said E monomer of the polymer of the release coating is selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, acrylamide, methacrylamide, N,N-dimethylacrylamide, methacrylonitrile and maleic anhydride.

6. The image receiving article of claim 1 wherein said substrate is labelstock.

7. A sheet assembly comprising a release coating on at least one nonadhesive bearing area of the rear surfaces of a sheet wherein the release coating comprises the formula:

##STR12## wherein R₁ are monovalent moieties which can independently be the same or different and are selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, hydroxyl, hydrogen, and fluoroalkyl;

R₂ can independently be the same or different and are divalent linking groups;

R₃ are monovalent moieties which can independently be the same or different and are selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, hydroxyl, hydrogen, and fluoroalkyl;

R₄ can independently be the same or different and are divalent linking groups;

x is an integer of 0-3;

y is an integer of 10 or greater;

q is an integer of 0-3; and

G₅ are monovalent moieties which can independently be the same or different selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, fluoralkyl, hydrogen, and -WSA;

A is a vinyl polymeric segment or block consisting essentially of polymerized free radically polymerized monomer;

G₆ are monovalent moieties which can independently be the same or different selected from the group consisting of alkyl, aryl, alkoxy, alkylamino, fluoroalkyl, hydrogen and -WSA; and

G₂ and G₄ are A.