Coated paper containers, method of coating and compositions therefor

Claim 1

AS A METHOD OF IMPROVIDING THE RESISTANCE OF PAPER TO STAINING AND PENETRATION BY ORDINARY FOODS AND BEVERAGES, BOTH HOT AND COLD, THE STEPS OF COATING A SURFACE OF THE PAPER WITH A LAYER OF AN AQUEOUS EMULSION OF POLYMERIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF (A) WATER EMULSIFIED STYRENE-BUTADIENE COPOLYMER AND (B) WATER EMULSIFIED POLYSTYRENE MIXED WITH WATER EMULSIFIED STYRENE-BUTADIENE COPOLYMER, SAID EMULSION FURTHER CONTAINING AN AMOUNT BETWEN ABOUT 5 AND 30% BY WEIGHT OF WATER EMULSIFIED LOWER ALKENE POLYMER FROM THE GROUP CONSISTING OF POLYPROPYLENE AND POLYETHYLENE HAVING A MOLECULAR WEIGHT IN THE ORDER OF 15,000 TO 30,000 WHICH IS SUFFICIENT TO INTRODUCE NON-BLOCKING CHARACTERISTICS TO THE FUSED FILM LEFT ON THE SURFACE AFTER HEATING WITHOUT INTERRUPTING THE CONTINUITY OF THE FILM. THE BUTADIDNE MOIETIES OF SAID POLYMERIC MATERIAL NOT EXCEEDING APPROXIMATELY ONE-HALF THEREOF, REMOVING MOIETIES BEING NOT LESS THAN ONE-HALF THEREOF, REMOVING THE WATER FROM THE AQUEOUS EMULSION LAYER THEREAFTER FUSING THE REMAINING SOLIDS WITH HEAT INTO A CONTINUOUS FILM, AND THEN COOLING TO NEAR ROOM TEMPERATURE SO AS TO LEAVE A CLEAR TRANSPARENT PROTECTIVE FILM STRONGLY ADHERENT TO THE PAPER.