Flexible hard surface covering and process of preparing same

Claim 1

A FLEXIBLE HARD SURFACE COVERING WHICH COMPRISES A BITUMEN-IMPREGNATED FELT BASE SHEET, A VINYL COMPOSITION TOP LAYER AND IN COMBINATION FOR BONDING SAID TOP LAYER TO SAID BASE SHEET AND FOR PROVIDING A SEAL THEREBETWEEN A SEAL COAT OF PAINT CONSISTING ESSENTIALLY OF OLEORESINOUS BINDER MATERIAL AND FILLER APPLIED TO AND FORMED ON SAID BASE SHEET, THE SAID BINDER MATERIAL BEING COMPRISED IN SAID SEAL PAINT SO AS TO CONSTITUTE FROM ABOUT 50% TO ABOUT 135% OF THE OIL ADSORPTION VALUE OF SAID FILLER; A FIRST PRIMER COAT APPLIED TO AND FORMED ON SAID SEAL COAT AND CHARACTERIZED BY BINDER MATERIAL CONSISTING ESSENTIALLY OF BUTADIENE-ACRYLONITRILE COPOLYMER RUBBER AND VINYL POLYMER RESIN SELECTED FROM THE GROUP CONSISTING OF POLYMERIZED VINYL CHLORIDE, POLYMERIZED VINYLIDENE CHLORIDE AND COPOLYMERS THEREOF IN THE RELATIVE PROPORTION BY DRY WEIGHT OF ABOUT 20 TO ABOUT 70 PARTS BY WEIGHT OF SAID BUTADIENE-ACTYLONITRILE COPOLYMER RUBBER AND ABOUT 80 TO ABOUT 30 PARTS OF SAID VINYL POLYMER RESIN, AND FILLER CONTAINED IN SAID FIRST PRIMER COAT BEING LESS THAN ABOUT 80% BY WEIGHT OF SAID COAT; AND A SECOND PRIMER COAT APPLIED TO AND FORMED ON SAID FIRST PRIMER COAT AND CHARACTERIZED BY BINDER CONSISTING ESSENTIALLY OF BUTADIENE-ACRYLONITRILE COPOLYMER RUBBER, VINYL POLYMER RESIN SELECTED FROM THE GROUP CONSISTING OF POLYMERIZED VINYL CHLORIDE, POLYMERIZED VINYLIDENE CHLORIDE AND COPOLYMERS THEREOF AND PLASTICIZER FOR SAID VINYL POLYMER RESIN, SAID BUTADIENEC-ACRYLONITRILE RUBBER AND VINYL POLYMER BEING PRESENT IN THE RELATIVE PROPORTION IN PARTS BY WEIGHT OF ABOUT 20 TO ABOUT 70 PARTS OF THE FORMED AND ABOUT 80 TO ABOUT 30 PARTS OF THE LATTER, THERE BEING ABOUT 5 TO ABOUT 300 PARTS BY WEIGHT OF PLASTICIZER PER 100 PARTS BY WEIGHT OF VINYL RESIN AND ANY FILLER CONTAINED IN SAID SECOND PRIMER COATING BEING LESS THAN ABOUT 80% BY WEIGHT OF SAID SECOND PRIMER COAT; SAID VINYL COMPOSITION TOP LAYER BEING APPLIED TO AND FORMED ON SAID SECOND PRIMER COAT.