Use of liquid carbon dioxide as a blowing agent in the productio

Details Use of liquid carbon dioxide as a blowing agent in the productio Use of liquid carbon dioxide as a blowing agent in the productio

1989-11-29

1992-06-09

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521110, 521112, 521129, 521131, 521133, C08G 1814

Patent

active

051207702

ABSTRACT:
A process for the production of an open cell polyurethane foam comprises the mixing of the following components at ambient temperatures in a mixing zone: a diisocyanate having a functionality of at least about 2.0, at least one hydrogen donor, at least one surfactant which is effective in forming an open cell polyurethane foam, at least one catalyst, and a blowing agent comprising a gas having a boiling point below approximately -100.degree. F. at atmospheric pressure which preferably comprises carbon dioxide. In addition, the mixture may also optionally contain water. The mixture is subjected to a pressure in said mixing zone which is sufficient to maintain the blowing agent in the liquid state at ambient temperatures. After mixing, the mixture is ejected from the mixing zone to atmospheric pressure, thereby completely and instantaneously vaporizing the blowing agent to provide expansion of the mixture. The resultant foam is then cured at ambient temperatures.

REFERENCES:
patent: 3882052 (1975-05-01), Raynor et al.
patent: 4337318 (1982-06-01), Doyle
patent: 4945119 (1990-07-01), Smits et al.

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