Waterborne acrylic low adhesion backsize and release coating compositions, methods of making the compositions, and sheet materials coated therewith

Claim 1

A latex comprising: (a) about 5 to about 70 weight percent of a polymer comprising polymerized free radically polymerizable monomer wherein said free radically polymerizable monomer comprises long-chain monomer of the formula C n H 2n+1 -P-C m H 2 m -X-CR¹=CH₂ wherein n is an integer of about 12 to about 20; P is a divalent polar linking group; X is a divalent linking group selected from the group consisting of m is an integer of about 2 to about 10; and R¹ is selected from the group consisting of -H and -CH₃; (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 said polymer are stabilized by the emulsifier and dispersed within the aqueous phase.

Claim 4

A method of preparing a latex which comprises the steps of: (a) forming a mixture comprising the following: (1) about 5 to about 70 weight percent of a melted free radically polymerizable monomer charge wherein the monomer charge comprises free radically polymerizable long-chain monomer of the formula C n H 2n+1 -P-C m H 2 m -X-CR¹=CH₂ wherein n is an integer of about 12 to about 20; P is a divalent polar linking group; X is a divalent linking group selected from the group consisting of m is an integer of about 2 to about 10; and R¹ is selected from the group consisting of -H and -CH₃; (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; and (e) sustaining said free-radical polymerization until a polymer-containing latex is produced.