Process for the preparation of polyurethane foams

Details Process for the preparation of polyurethane foams Process for the preparation of polyurethane foams

1989-02-27

1990-06-05

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521128, 521131, 521155, C08G 1814

Patent

active

049314807

ABSTRACT:
This invention relates to a process for the preparation of polyurethane foams by the reaction of a foamable reaction mixture. A liquid blowing agent is added to either the isocyanate or the polyol prior to mixing of the components. An inert gas is dispersed in the component which contains the blowing agent and the gas charged component is immediately and continuously mixed with the other component, at the same time keeping it at least under the pressure required for charging it with gas until mixing has been completed, and leaving the resulting reaction mixture to foam up. The key to the present invention is in the small amount of gas charging.

REFERENCES:
patent: 4764536 (1988-08-01), Proksa et al.

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