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US 6,649,667 B2Granted
Polyurethane foams having improved heat sag and a process for their production
AssigneeBayer Polymers LLC
InventorJan L. Clatty
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Abstract
Rigid, closed-cell polyurethane foams are produced by a RIM process by reacting an organic polyisocyanate with an isocyanate-reactive mixture in which a significant amount of a bio-based polyol is present. The foams produced by this process are characterized by improved heat sag and heat distortion temperature.
Claims10
A RIM process for the production of a rigid, closed-cell polyurethane foam comprising:
- a) intimately mixing (1) an isocyanate-reactive component comprising:
- (i) from 0.5 to 30% by weight, based on total weight of isocyanate-reactive component, of a vegetable oil, fish oil or oil derived from animal fat,
- (ii) from 5 to 80% by weight, based on total weight of isocyanate-reactive component, of an isocyanate-reactive material which is different from (i) having a functionality of at least 1 and a number average molecular weight of from 400 to 10,000,
- (iii) a chain extender or a crosslinking agent,
- (iv) water, and
- (v) a catalyst
- with (2) an organic polyisocyanate in an amount such that the ratio of NCO to OH groups is from 0.8:1 to 1.3:1 and
- b) introducing the mixture from a) into a mold.
5 more elements
A RIM process for the production of a rigid, closed-cell polyurethane foam comprising:
- a) intimately mixing an isocyanate-reactive component comprising:
- (i) at least 10% by weight, based on total weight of isocyanate-reactive component, of a soybean oil based polyol,
- (ii) from 5 to 80% by weight, based on total weight of isocyanate-reactive component, of a polyether polyol having a functionality of from 2 to 8 and a number average molecular weight of from 400 to 10,000,
- (iii) from 1 to 75% by weight, based on total weight of isocyanate-reactive component, of a chain extender,
- (iv) water, and
- (v) a catalyst
- with an organic polyisocyanate in an amount such that the ratio of NCO to OH groups is from 0.8:1 to 1.3:1 and
- b) introducing the mixture from a) into a mold.
5 more elements
Dependencies are inferred from the claim text.