| http://www.w3.org/ns/prov#value | - The method of claim 1 wherein said cross-linking agent is an agent selected from the class consisting of dichlorobutene, n-octyl chlorothioformate, divinylsulfone, 8 References Cited UNITED STATES PATENTS 3,152,925 10/1964 Patel et a1. 127-33 5 DONALD E. CZAJ A, Primary Examiner.
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