Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Patent
1990-03-09
1992-03-03
Buffalow, Edith L.
Stock material or miscellaneous articles
Composite
Of addition polymer from unsaturated monomers
428141, 428500, 525222, B32B 2732
Patent
active
050932063
ABSTRACT:
A curable laminated article, useful for roofing application, comprising at least two layers, each layer comprising a blend of (a) 50-80% by weight of an ethylene/propylene
onconjugated diene elastomer and (b) 20-50% by weight of an ethylene-containing polymer selected from the group consisting of polyethylene, an ethylene alpha-monoolefin copolymer wherein the monoolefin contains from 3-12 carbon atoms and is present in amounts of 2-8% by weight, and as ethylene/vinyl acetate copolymer having a vinyl acetate content up to about 10% by weight, and wherein each alternate layer contains either elemental sulfur as the crosslinking agent for the elastomer or a cure accelerator so that the elastomer in the laminated article subsequently cures when elemental sulfur and the accelerator in each layer migrate to an adjacent layer when the laminate is exposed to elevated temperatures.
REFERENCES:
patent: 2611721 (1949-06-01), Brees
patent: 3372078 (1968-05-01), Fausti et al.
patent: 3834932 (1974-09-01), Brandl
patent: 4666785 (1987-05-01), Crepeau
Buffalow Edith L.
E. I. Du Pont de Nemours and Company
Evans Craig H.
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