Process for the preparation of polyurea elastomers

Details Process for the preparation of polyurea elastomers Process for the preparation of polyurea elastomers

1984-10-25

1985-10-08

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 51, 2643281, 528 64, 528 76, 528 77, 528 83, C08G 1814

Patent

active

045461147

ABSTRACT:
An improved process for the reaction injection molding of high flexural modulus polyurea containing elastomers is disclosed. Elastomers of this type when prepared at the prior art molding temperatures are brittle and can shatter like glass while still in the mold. The same elastomers when molded at a temperature of from about 90.degree. to about 220.degree. C. are not at all brittle. These elastomers are also characterized by the other advantageous properties inherent in polyurea elastomers such as high tensile strength, high hardness, and good heat resistance.
The improved RIM process finds particular utility in the preparation of auto parts such as panels, engine hoods, and the like.

REFERENCES:
patent: 4098773 (1978-07-01), Illers et al.
patent: 4218543 (1980-08-01), Weber et al.
patent: 4272618 (1981-06-01), Dominguez et al.
patent: 4296212 (1981-10-01), Ewen et al.
patent: 4374210 (1983-02-01), Ewen et al.
patent: 4433067 (1984-02-01), Rice et al.
patent: 4442235 (1984-04-01), Taylor et al.
McBrayer et al., J. of Cellular Plastics, Jul./Aug. 1977, p. 255.

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