Slip-resistant thermoplastic resin sheets and process for producing same

Claim 1

A TRANSPARENT PACKAGING CONTAINER CHARACTERIZED BY A SLIP-RESISTANT SURFACE AND HAVING SIDE WALLS AND A TOP AND BOTTOM CLOSURE COMPOSED OF AN OUTER THERMOPLASTIC POLYMER FILM LAYER, SAID THERMOPLASTIC POLYMER LAYR HAVING A NORMALLY SLIPPERY OUTER SURFACE AND A SLIP RESISTANT, SMOOTH, NON-TACKY FILM ON SAID SURFACE AND ADHERENT THERETO, WHICH FILM IS COMPOSED OF A UNIFORM MIXTURE OF PARTICLE SOF AN ALKALI STABILIZED, COLLOIDAL SILICA AND PARTICLES OF A FINELY DIVIDED COPOLYMER COMPRISING THE INTERPOLYMERIZATION PRODUCT OF (1) FROM ABOUT 26% TO ABOUT 65% OF A MONOVINYLIDENE AROMATIC HYDROCARBON, (2) FROM ABOUT 60% TO ABOUT 34.5% OF AN ALKYL ESTER OF AN UNSATURATED ACID SELECTED FROM THE GROUP CONSISTING OF ACRYLIC ACID AND METHACRYLIC ACID AND (3) FROM ABOUT .5% TO ABOUT 14% OF AN ETHYLENICALLY UNSATURATED ORGANIC CARBOXYLIC COMPOUND HAVING AT LEAST ONE CARBOXYL GROUP AND COPOLYMERIZABLE WITH SAID MONOVINYLIDENE AROMATIC HYDROCARBON AND SAID ALKYL ESTER; THE QUANTITY OF COLLOIDAL SILICA AND INTERPOLYMERIZATION PRODUCT IN SAID ADHERENT FILM BEING IN THE RANGE OF FROM 10 TO 500 PARTS BY WEIGHT OF SIO2 PER 100 PARTS BY WEIGHT OF SAID INTERPOLYMERIZATION PRODUCT.