Moisture cured elastomeric interpenetrating network sealants
AssigneeNorton Company
InventorsAhmet Comert, Michel Ladang, Dominique Petit
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Abstract
An interpenetrating polymer system prepared from a mixture of a moisture-cured prepolymer component and an elastomeric component which is non-reactive with the prepolymer component, wherein exposure of the mixture to ambient moisture cures the prepolymer component entrapping the elastomeric component and forming a product which is essentially thermoset. The product may be essentially non-foamed or highly foamed and and either tack-free or self-adhesive. It is particularly suitable for use as sealing gaskets, sheet stock, tubing, and as sealant-encapsulants.
Claims6
An extrudable thermoplastic composition of matter comprising an intimate mixture of:
- (a) a first component which is a prepolymer having a number average molecular weight of about 1,000 to about 15,000, a backbone and an average of about 2 terminal isocyanate groups which are reactive with each other in the presence of ambient moisture to form a derivative polymer having a longer average chain length than said prepolymer:
- (b) a second component which is a plasticized polyvinylchloride polymer which is non-chemically reactive with itself and with said first component in the presence or absence of moisture,
- wherein said composition of matter after cure by exposure to moisture forms an elastomeric interpenetrating network.
Dependencies are inferred from the claim text.