# US 5,350,631 A · Water-borne low adhesion backsize and release coating compositions, methods of making the compositions, and sheet materials coated therewith

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- Number: US 5,350,631 A
- Document ID: US5350631A
- Status: Granted
- Kind: A
- Application number: 08/086,323
- Filed: 1993-07-01
- Granted: 1994-09-27
- Earliest claimed: 1990-03-21
- Assignees: Minnesota Mining and Manufacturing Company
- Inventors: Chi-Ming Tseng; Steven S. Kantner
- Web page: https://patentgrep.com/patent/US5350631A

## CPC

- C08F 220/20: of polyhydric alcohols or phenols {, e.g. 2-hydroxyethyl (meth)acrylate or glycerol mono-(meth)acrylate}
- C08F 220/343: {in the form of urethane links}
- Y10T 428/28: Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T 428/31935: Ester, halide or nitrile of addition polymer
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A water-borne low adhesion backsize and release coating latex composition comprising: (a) about 5 to about 70 weight percent of a polymer comprising polymerized free radically polymerizable monomer of the formula C.sub.n H.sub.2n+1 --Y--C.sub.m H.sub.2m --X--CR.sup.1 .dbd.CH.sub.2 wherein n is an integer of about 12 to about 20, Y is a divalent polar linking group, X is a divalent linking group selected from the group consisting of ##STR1## m is an integer of about 2 to about 10, and R.sup.1 is selected from the group consisting of --H and --CH.sub.3, (b) about 30 to about 95 weight percent of an aqueous phase, and (c) about 0.05 to about 4 weight percent of an emulsifier, wherein particles of the polymer are stabilized by the emulsifier and dispersed within the aqueous phase. A method of making the latex and sheet materials coated therewith.

## Claims

### Claim 1

A method of preparing a coated sheet material comprising the steps of:
a) forming a mixture comprising the following:
(1) about 5 to about 70 weight percent of a melted free radically polymerizable free radically polymerizable long-chain monomer of the formula
C.sub.n H.sub.2n+1 --P--C.sub.m H.sub.2m --X--CR.sup.1 .dbd.CH.sub.2
wherein
n is an integer of about 12 to about 20;
Y is a divalent polar linking group selected from the group consisting of ##STR8## X is a divalent linking group selected from the group consisting of ##STR9## m is an integer of about 2 to about 10; and R.sup.1 is selected from the group consisting of --H and --CH.sub.3 ;
(2) about 30 to about 95 weight percent of deionized water; and
(3) about 0.05 to about 4 weight percent of an emulsifier;
b) homogenizing the mixture in order to form an emulsion;
c) adding to said emulsion about 0.01 to about 1 weight percent of a free radical initiator capable of initiating free radical polymerization of said monomer upon being subjected to a means of initiation;
d) initiating free-radical polymerization by subjecting said emulsion to a means of initiation while agitating said emulsion under inert atmospheric conditions;
e) sustaining said free-radical polymerization until a polymer-containing latex is produced;
f) diluting said latex to at least about 2 weight percent solids by combining said latex with an aqueous phase;
g) coating said diluted latex onto at least a portion of one major surface of a flexible sheet; and
h) evaporating said aqueous phase in order to form a coated sheet material comprising said flexible sheet coated with said polymer.

### Claim 2 (depends on 1)

The coated sheet material formed according to the method of claim 1.

### Claim 3 (depends on 2)

The sheet material of claim 2 wherein the latex coating is on one side of the sheet and an adhesive is on the other side.

### Claim 4 (depends on 3)

The sheet material of claim 3, wherein the adhesive is a normally tacky and pressure-sensitive adhesive.

### Claim 5 (depends on 4)

A stack of superimposed sheets of the material of claim 4, the pressure-sensitive adhesive on each sheet being in contact with the latex coating on an immediately adjacent sheet.

### Claim 6 (depends on 3)

The sheet material of claim 3 wound convolutely on itself about a core to form a roll.

### Claim 7 (depends on 2)

The sheet material of claim 2 wherein the latex coating covers a first portion of one side and a normally tacky and pressure-sensitive adhesive covers a second portion of the same side.