Process for producing rigid polyurethane foam

Details Process for producing rigid polyurethane foam Process for producing rigid polyurethane foam

1990-06-06

1992-03-31

Kight, III, John

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521128, 521129, 521137, C08G 1816, C08J 908, C08L 7504

Patent

active

051009277

ABSTRACT:
A process for producing a rigid polyurethane foam by use of a decreased amount of a CFC blowing agent and an increased amount of water used as a blowing agent, maintaining a high degree of heat insulation and improving the deterioration in friability of the product. The catalyst is one of the imidazoles represented by the formula (I): ##STR1## where R.sup.1 is alkyl having 1 to 4 carbons, benzyl, dimethylaminopropyl, or hydroxyalkyl having 1 to 3 carbons; R.sup.2 is hydrogen, alkyl having 1 to 4 carbons, allyl, or benzyl; and R.sup.3 and R.sup.4 are independently hydrogen, methyl, or hydroxymethyl.

REFERENCES:
patent: 4444704 (1984-04-01), Hira et al.
patent: 4717738 (1988-01-01), Fukuda et al.
patent: 4981880 (1991-01-01), Lehmann et al.

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