Polyurethane foam of low thermal conductivity and method of prep

Details Polyurethane foam of low thermal conductivity and method of prep Polyurethane foam of low thermal conductivity and method of prep

1993-03-29

1994-12-06

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 54, 521122, 523218, 523219, C08J 932, C08K 520

Patent

active

053711130

ABSTRACT:
Polyurethane foam of low thermal conductivity is prepared by employing carbon dioxide as a blowing agent, preferably in combination with a halogenated compound, typically a halocarbon or halohydrocarbon such as monofluorotrichloromethane or 1,1-dichloro-1-fluoroethane, and incorporating in the foam a carbon dioxide-reactive reagent. Sodium hydroxide and soda lime are illustrative carbon dioxide-reactive reagents. The carbon dioxide is preferably formed in situ by the reaction of water with the diisocyanate precursor of the polyurethane, and the carbon dioxide-reactivereagent is preferably introduced in admixture with a portion of the polyol precursor.

REFERENCES:
patent: 4110268 (1978-08-01), Longley et al.
patent: 4176218 (1979-11-01), Demou et al.
patent: 4469820 (1984-09-01), Dexheimer et al.
patent: 4686240 (1987-08-01), Bailey et al.
patent: 4882363 (1989-11-01), Neuhaus et al.
patent: 4999383 (1991-03-01), Blount
patent: 5110834 (1992-05-01), Horn

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