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US 4,153,768 AGranted
Organic hydroxy silicates utilized as curing agents for polyurethane prepolymers
OwnerDavid H. Blountinventor
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Abstract
Liquid isocyanate-terminated polyurethane prepolymers are cured by mixing them with 10% to 200% by weight, based on the weight of the prepolymer, of an organic hydroxy silicate compound or their condensation product. The cured material may be non-porous elastomeric products or fine cellular products.
Claims21
The process for curing a liquid isocyanate-terminated polyurethane prepolymer with a mixture of an organic hydroxy silicate compound and polymer to produce a polyurethane product by the following steps:
- (a) adding 1 part by weight of a mixture of an organic hydroxy silicate compound and polymer, produced by heating about 1 part by weight of a fine granular hydrated silica with 1 to 3 parts by weight of an organic hydroxy compound in the presence of an alkali catalyst while agitating for 20 to 90 minutes, to up to 1 part by weight of water;
- (b) admixing 0.5 to 6 parts by weight of a liquid isocyanate-terminated polyurethane prepolymer to the said mixture;
- (c) agitating said mixture for 5 to 15 minutes, thereby
- (d) producing a polyurethane product.
1 more element
Dependencies are inferred from the claim text.