Patent ID: 6071582
Filing Date: 2000-06-06
Classification: B32B,F16L,Y10T

Abstract:
A rubber layer structure comprising:a first rubber layer having a first liquid facing surface and second surface, said first rubber layer comprising in a pre-vulcanized state a peroxide vulcanizable composition comprising (a) EPDM, (b) a sulfur co-crosslinking agent, and reinforcing organic fillers (c1) carbon black in an amount of 80-180 phr, (c2) calcium carbonate, and (c3) talc having an average particle size of about 1 to 5 .mu.m and an aspect ratio of about 5 to 20, with the proviso that said first rubber layer does not contain zinc; anda second rubber layer in contact with said second surface, said second rubber layer comprising in a pre-vulcanized state a sulfur vulcanizable composition comprising (a) EPDM and (b) a zinc compound, wherein said first rubber layer is adhered to said second rubber layer by vulcanization.