Novel process for making polyurethane products which require red

Details Novel process for making polyurethane products which require red Novel process for making polyurethane products which require red

1985-09-20

1988-01-05

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

249170, 264 53, 264 54, 264101, 264DIG5, 264DIG13, 264DIG15, 425817R, B29C 6722, B29C 3910, B29C 938

Patent

active

047175184

ABSTRACT:
A process for making molded high resilience polyurethane cellular products which require reduced crushing in preventing the products from substantially shrinking or changing dimensionally upon cooling which comprises: exposing the curing product to atmospheric pressure while in contact with the confines of the mold at a time when the cell walls of the curing polyurethane cellular product have cured sufficiently to develop sufficient strength to partially resist bursting by the pressure of said expansion gases contained within the cell walls upon exposure to atmospheric pressure, but before the cell walls have cured sufficiently to develop sufficient strength so that exposure to atmospheric pressure does not result in a reduction of the crushing force necessary to prevent the products from substantially shrinking or changing dimensionally.

REFERENCES:
patent: 4579700 (1986-04-01), Cavender

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