Process for preparation of polyurethane-polycarbodiimide foam

Details Process for preparation of polyurethane-polycarbodiimide foam Process for preparation of polyurethane-polycarbodiimide foam

1996-03-18

1997-04-15

Clark, W. Robinson H.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525460, 521155, 521170, 524115, 524178, C08L 7508

Patent

active

056210515

ABSTRACT:
A process for preparation of a polyurethane-polycarbodiimide foam which comprises reacting a polyol component containing a benzylic ether type phenol resin having hydroxymethyl groups with an organic polyisocyanate component in the presence of an organotin catalyst for urethane formation and a carbodiimidating catalyt. According to this process, it is unnecessary to use fluorine-containing halogenated hydrocarbons as a blowing agent, and blowing on the spot is possible using a spray blowing machine or the like.

REFERENCES:
patent: 3485797 (1969-12-01), Robins
patent: 5126305 (1992-06-01), Eling
Ulrich et al., Journal of Cellular Plastics, "Chemistry and Properties of Low Density Poly(Carbodiimide) Foams", vol. 21, No. 5, pp. 350-357 (1985).
Papa et al., Journal of Cellular Plastics, "Hybrid Phenolic/Urethane Foams", pp. 258-266, Sep./Oct. 1979.

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