Acrylate microsphere-surfaced sheet material

Claim 1

A REPEATEDLY USABLE PRESSURE-SENSITIVE SHEET MATERIAL COMPRISING A SUBSTRATE HAVING BONDED THERETO A BINDER MATERIAL, SAID BINDER HAVING PARTIALLY EMBEDDED IN AND PROTRUDING FROM ITS EXPOSED SURFACE INHERENTLY TACKY ELASTOMERIC COPOLYMER MICROSPHERES CONSISTING ESSENTIALLY OF A. ABOUT 90 TO ABOUT 99.5 PERCENT BY WEIGHT OF ONE OR MORE OLEOPHILLIC, WATER-EMULSIFIABLE ALKYL ACRYLATE ESTERS, AT LEAST ONE OF SAID ESTERS BEING SELECTED FROM THE GROUP CONSISTING OF ISO-OCTYL ACRYLATE, 4-METHYL-2-PENTYL ACRYLATE, 2-METHYLBUTYL ACRYLATE, AND SEC-BUTYL ACRYLATE AND CORRESPONDINGLY B. ABOUT 10 TO ABOUT 0.5 PERCENT BY WEIGHT OF ONE OR MORE MONOMERS SELECTED FROM THE GROUP CONSISTING OF TRIMETHYLAMINE METHACRYLIMIDE, TRIMETHYLAMINE P-VINYL BENZIMIDE, AMMOMIUM ACRYLATE, SODIUM ACRYLATE, N,NDIMETHYL-N-(B-METHACRYLOXYETHYL) AMMONIUM PROPIONATE BETAINE, 1,1-DIMETHYL-1-(2-HYDROXYPROPYL)AMINE METHACRYLIMIDE, 4,4,9-TRIMETHYL-4-AZONIA-7-OXO-8-OXA-9DECENE-1-SULPHONATE, 1,1-DIMETHYL-1-(2,3DIHYDROXYPROPYL) AMINE METHACRYLIMIDE, AND MALEIC ANHYDRIDE.