Method of producing dipped articles from butyl rubber-polyethylene solutions

Claim 1

THE PROCESS WHICH COMPRISES FORMING AN INTIMATE MIXTURE OF 100 PARTS BY WEIGHT OF AN ISOBUTYLENE-DIOLEFIN RUBBERY COPOLYMER, FROM 30 TO 70 PARTS OF A FILTER, AND A CURATIVE FOR SAID COPOLYMER IN AN AMOUNT SUFFICIENT TO PARTIALLY BUT INCOMPLETELY CURE SAID COPOLYMER, MASTICATING SAID MIXTURE AT A TEMPERATURE AT WHICH SAID CURATIVE PRE-CURES SAID COPOLYMER, WHEREBY TH COPOLYMER BECOMES PARTIALLY CURED BUT IS STILL SUSCEPTIBLE OF FURTHER CURE, COOLING THE RESULTING MIXTURE, INTIMATELY INCORPORATING WITH THE RESULTING MIXTURE, AT A TEMPERATURE AT WHICH THE SUBSEQUENTLY ADDED CURATIVE WILL NOT REACT, FROM 20 TO 50 PARTS OF POLYETHYLENE HAVING A MOLECULAR WEIGHT OF FROM 8,000 TO 12,000, AND A CURATIVE IN AMOUNT SUFFICIENT TO COMPLETE THE CURE OF SAID COPOLYMER, DISSOLVING THE RESULTING MIXTURE IN A VOLATILE ORGANIC SOLVENT TO A SOLIDS CONTENT OF FROM 15 TO 25%, DIPPING A FORM HAVING THE CONFIGURATION OF THE DESIRED FINAL ARTICLE IN THE RESULTING SOLUTION WHILE IT IS AT A TEMPERATURE OF FROM 150 TO 190*F. AND IS IN LIQUID FORM, DRYING THE COATING THUS FORMED, THE SAID POLYETHYLENE SERVING AS A THERMOPLASTIC MEDIUM THROUGH WHICH SOLVENT ESCAPES FROM ALL PORTIONS OF THE SAID COATING AND THE SAID POLYETHYLENE PREVENTING THE SAID COATING FROM SKINNING AND TRAPPING SOLVENT UNDERNEATH SUCH SKIN, AND THEREAFTER CURING THE ARTICLE THUS FORMED ON SAID FORM BY HEATING AT ELEVATED TEMPERATURE.