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US 4,359,549 AGranted
Polyurethane sealant compositions
AssigneeBASF Wyandotte Corporation
InventorsJames A. Gallagher, Bernardas Brizgys
Life of this patent
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Abstract
The subject matter of this invention pertains to polyurethane sealant compositions which are flexible, strong, and resistant to shrinkage. The sealants are prepared by reacting a mixture of polyether polyol and inorganic filler with a polyisocyanate. The polyurethane sealants are useful for making castings, for patching, and as heat barriers.
Claims4
In the process of manufacturing aluminum window and door frames which involves using a substance which acts as a heat barrier, the improvement comprising using a polyurethane sealant composition prepared by
- (a) mixing a polyether polyol or polyether polyol blend having a branching density of 400 grams to 700 grams per branching unit with an inorganic filler selected from the group consisting of calcium silicate, aluminum silicate, magnesium silicate, and mixtures thereof, said filler being added in an amount which is from 0.15 part to 0.7 part by weight per part by weight of polyether polyol or polyether polyol blend, and
- (b) reacting the mixture made in accordance with paragraph (a) with an organic polyisocyanate such that the ratio of isocyanate groups of the polyisocyanate to the hydroxyl groups of the polyether polyol is 1.0:1 to 1.2:1
- as the substance which acts as a heat barrier.
Dependencies are inferred from the claim text.