Acrylic latex coating composition and book cover material made therefrom

Claim 1

A BOOK COVER MATERIAL COMPRISING (A) A BASE FABRIC HAVING (B) A COATING FIRMLY BONDED TO ONE OF ITS SIDES COMPRISING A POLYMERIC SEALER SUBSTANTIALLY FREE FROM MIGRATORY PLASTICIZER, (C) A COATING FIRMLY BONDED TO THE POLYMERIC SEALER AND MADE FROM A POLYVINYL CHLORIDE PLASTISOL CONTAINING PLASTICIZERS THAT ARE SUBSTANTIALLY POLYMERIC ONLY, AND (D) A CROSSLINKED TOP COATING FIRMLY BONDED POLYVINYL CHLORIDE COATING AND MADE FROM AN ACRYLIC LATEX, SUBSTANTIALLY NEUTRAL, COMPRISING A BLEND OF: (1) 30-65% BY WEIGHT OF A LATEX CONSISTING ESSENTIALLY OF AN AQUEOUS DISPERSION OF A RELATIVELY SOFT ACRYLIC TERPOLYMER WHICH IS PREDOMINANTLY ETHYL ACRYLATE, CONTAINING MINOR AMOUNTS OF METHYL ACRYLATE AND ACRYLIC ACID OF HIGH MOLECULAR WEIGHT AND HAVING SUBSTANTIAL CROSSLINKING PROPERTIES AND (2) CORRESPONDINGLY 70-35% BY WEIGHT OF A LATEX COMPRISING ABOUT 32% BY WEIGHT OF AN AQUEOUS DISPERSION OF AN EXTREMELY HARD ACRYLIC RESIN CONSISTING ESSENTIALLY OF POLYMETHYLMETHACRYLATE AND ABOUT 14% BY WEIGHT OF A VOLATILE PLASTICIZER SUITABLE FOR SAID HARD ACRYLIC RESIN (3) SAID LATEX BLEND BEING FURTHER CHARACTERIZED BY THE FACT THAT WHEN CURED WITHOUT ADJUVANTS, IT YIELDS A FILM HAVING A TUKON HARDNESS, KHN OF FROM ABOUT 6.7 TO 1.5, AND (4) FROM ABOUT 10.4% BY WEIGHT TO ABOUT 25% BY WEIGHT, BASED ON RESIN SOLIDS, OF A FINELYDIVIDED SILICA HAVING A SURFACE AREA OF AT LEAST 50 SQUARE METERS PER GRAM.