Low density energy management urethane foam

Details Low density energy management urethane foam Low density energy management urethane foam

1978-08-25

1980-02-26

Cockeram, H. S.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 455, 264 456, 264 468, 264DIG14, 293109, 521159, 521167, 521176, 521129, C08G 1863, C08G 1865

Patent

active

041907124

ABSTRACT:
An impact energy-absorbing, low density urethane foam for use in automobile bumpers has good moldability and is relatively temperature insensitive, i.e. gives approximately the same physical performance over a wide range of temperatures. This foam is characterized by its good multiple impact performance and low compression set values. The foam is water blown in a closed mold from a quasi-prepolymer system. The molded density is preferably in the range of 5 to 10 PCF.
The foam formulation is based on a polymer polyol of a poly (oxypropylene/ethylene) triol reacted with a styrene/acrylonitrile monomer mixture which triol thus modified is reacted with (1) a roughly 1/5 to 1.5/1 weight amount of a hydroxy terminated polybutadiene homopolymer based on polymer polyol, (2) a 50 to 150 equivalent weight polyol crosslinker of 2 to 6 functionality, (3) a MDI glycol or triol quasi-prepolymer, and (4) some water.

REFERENCES:
patent: 3248373 (1966-04-01), Barringer
patent: 3591561 (1971-07-01), Kazama et al.
patent: 3595814 (1971-07-01), Lloyd et al.
patent: 3630973 (1971-12-01), Ardis
patent: 3661811 (1972-05-01), Hardy et al.
patent: 3664976 (1972-05-01), Evans et al.
patent: 4119586 (1978-10-01), Shah

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