Method of making low compression set urethane foams

Details Method of making low compression set urethane foams Method of making low compression set urethane foams

1987-08-27

1988-06-21

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521176, C08G 1814

Patent

active

047526262

ABSTRACT:
This invention generally relates to a high resilience urethane foam (HR foam) having low compression set at a wide range of isocyanate index for use in small void filling in integrated foam parts.
The small voids formed in the molding process of integrated foam parts can be filled without penetration of foaming liquids into existing foam cells. In addition, resulting foams have very low compression set values at a wide range of isocyanate index.
The foaming system of the present invention is composed of two components, i.e., thixotropic polyisocyanate component and thixotropic polyol component. Their thixotropicity is obtained by adding benzal sorbitol into respective components. The polyisocyanate is selected from organic polyisocyanates and the polyol component is prepared by mixing a polyol blend composed of a polyolefinic polyol and a polyoxyalkylene polyol in a weight ratio between 95/5 to 50/50, a blowing agent, a surfactant and a catalyst.

REFERENCES:
patent: 4067759 (1978-01-01), Vrolyk et al.
Ashida et al., International Progress in Urethanes, vol. 2, Technomic Publishing Co., pp. 153-173, 1980.
Ashida et al., International Progress in Urethanes, vol. 3, Technomic Publishing Co., pp. 173-179, 1980.
Saunders et al., Polyurethanes, Interscience, pp. 161-173 & 208-215, 1962.
Oentel, Polyurethane Handbook, Hansen, pp. 90-96, 1985.

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