Blowing agent composition and polyisocyanate-based foam...

Details Blowing agent composition and polyisocyanate-based foam... Blowing agent composition and polyisocyanate-based foam...

C - Chemistry, Metallurgy

08

J

C08J 9/14 (2006.01) C08J 9/00 (2006.01)

Patent

CA 2577929

The present invention relates to a polyisocyanate-based foam prepared in the presence of a blowing agent which comprises from 50 to 95 parts be weight 1,1,1,2-tetrafluoroethane (134a) and from 5 to 50 parts by weight of 1,1,1,3,3- pentafluoropropane (245fa). Use of such a blowing agent composition provides for foam with a reduced smoke emission index.

La présente invention a pour objet une mousse polyisocyanate préparée en présence d~un agent d~expansion qui comprend entre 50 et 95 parts en masse de 1,1,1,2-tétrafluoroéthane (134a) et entre 5 et 50 parts en masse de 1,1,1,3,3-pentafluoropropane (245fa). L~utilisation d~une telle formule d~agent d~expansion permet d'obtenir une mousse d'indice d'émission de fumée réduit.

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