0657495-A1 is referenced by 10 patents and cites 5 patents.

The mfr. uses a halogen-free organic liq. as a physical blowing agent for the foam. The organic liq. contains a positive azeotrope of min. b.pt. 15-80 deg.C at normal atmospheric pressure and comprises (a) a 5-7C cycloaliphatic hydrocarbon, and (b) a 4C aliphatic ether, a 2-5C aliphatic carboxylic acid ester, a 4C aliphatic ketone or a mixt. 1-10 pts. wt. of a nucleating agent per 100 pts. wt. of foaming ingredients are present during foaming pref. perfluoropentane. The wt. ratio of azeotrope components in the organic liq. is within +/- 20% (+/- 10%) of an ideal azeotrope compsn. The foam is pref. a rigid polyurethane, integral skin flexible polyurethane or urethane-modified polyisocyanurate foam. The azeotrope has a min. boiling temp. of pref. 15-45 (20-40) deg.C.; It comprises cyclopentane and (m)ethyl formate or methyl acetate, cyclohexane and methyl formate, cyclohexane or cyclohexene and 2-butanone, cyclopentane or cyclopentene and 2-butanone or cyclopentane and furan.

Title
Halogen-free blowing agents that include cycloaliphatic hydrocarbons and are suitable for isocyanate-based polymeric foams.
Application Number
EP19940119248 19941206
Publication Number
0657495 (A1)
Application Date
December 6, 1994
Publication Date
June 14, 1995
Inventor
Ashida Kaneyoshi
US
Assignee
Nisshin Spinning
JP
IPC
C08L 75/04
C08J 09/00
C08J 09/14
C09K 03/00
C08J 09/00
C09K 03/00
C08J 09/14
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