Liquid coating composition of methyl methacrylate polymer and an organophilic cation-modified clay, and process of making

Claim 1

A LIQUID COATING COMPOSITION WHICH ON DRYING YIELDS A HARD, ADHERENT CRAZE-RESISTANT COATING, COMPRISING A POLYMER OF METHYL METHACRYLATE AS THE MAJOR FILM-FORMING CONSTITUENT, SOLVENT THEREFOR, AND 1-50% OF ORGANOPHILIC CATION-MODIFIED CLAY, BASED ON THE TOTAL WEIGHT OF THE NON-VOLATILE COMPONENTS, SAID POLYMER OF METHYL METHACRYLATE BEING A MEMBER OF THE GROUP CONSISTING OF HOMOPOLYMERS OF METHYL METHACRYLATE, COPOLYMERS OF METHYL METHACRYLATE AND ANOTHER MATERIAL COPOLYMERIZABLE THEREWITH CONTAINING A MAJOR PROPORTION OF POLYMERIZED METHYL METHACRYLATE, AND MOXTURES OF SUCH HOMOPOLYMERS AND COPOLYMERS, SAID OTHER MATERIAL BEING A MEMBER OF THE GROUP CONSISTING OF METHACRYLIC ACID, A 1-4 CARBON ALKYL ESTER OF ACRYLIC ACID, A 2-4 CARBON ALKYL ESTER OF METHACRYLIC ACID, VINYL ACETATE, ACRYLONITRILE AND STYRENE, AND SAID CATION BEING AN ONIUM RADICAL OF THE CLASS CONSISTING OF AMMONIUM, PHOSPHONIUM, OXONIUM, SULFONIUM, SELENONIUM, STANNONIUM, ARSONIUM, STIBONIUM, TELLURONIUM AND IODONIUM, AND HAVING AT LEAST ONE ALKYL SUBSTITUENT CONTAINING AT LEAST 10 CARBON ATOMS IN A STRAIGHT CHAIN.