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US 12,503,544 B2Granted
Elastomeric compositions and methods of use
AssigneePPG Industries Ohio, Inc.
InventorsCynthia Kutchko, Brian Chiang, Bryan W. Wilkinson, Eric S. Epstein, Michael A. Bubas
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Abstract
Compositions comprising a combination of low molecular weight prepolymers and high molecular weight prepolymers are disclosed. The compositions are used to fabricate elastomeric articles having high tensile strength and high tensile elongation.
Claims17
A coreactive composition comprising:
- (a) from 10 wt % to 80 wt % of a first elastomeric prepolymer, wherein the first elastomeric prepolymer comprises:
- an isocyanate-functional polyether prepolymer;
- and
- a number average molecular weight from 500 Da to 6,000 Da;
- (b) from 10 wt % to 80 wt % of a second elastomeric prepolymer, wherein the second elastomeric prepolymer comprises:
- an amine-functional polyether prepolymer;
- and
- a number average molecular weight from 500 Da to 6,000 Da;
- and
- (c) from 5 wt % to 25 wt % of a third elastomeric prepolymer, wherein the third elastomeric prepolymer comprises:
- a silanol-functional polydimethylsiloxane prepolymer;
- and
- a number average molecular weight from 50,000 Da to 500,000 Da, wherein,
- the number average molecular weight is determined by gel permeation chromatography;
- and wt % is based on the total weight of the first elastomeric prepolymer, the second elastomeric prepolymer, and the third elastomeric prepolymer in the coreactive composition.
12 more elements
Dependencies are inferred from the claim text.