Rim elastomers with improved heat distortion and tear properties

Details Rim elastomers with improved heat distortion and tear properties Rim elastomers with improved heat distortion and tear properties

1980-08-25

1981-11-17

Cockeram, H. S.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

521176, 521131, 521133, 521914, 528 67, 528 53, 528 58, 528 77, 2643281, 26433119, C08G 1848, C08G 1814, C08G 1882, B28B 124

Patent

active

043011101

ABSTRACT:
The invention covers a method for making reaction injection molded polyurethanes of improved properties. The elastomeric products having superior heat distortion and tear properties comprise the reaction product of an aromatic polyisocyanate, a high molecular weight polyol and a chain extending agent. Said polyol providing said improved properties is a poly(oxybutyleneoxyethylene) glycol having a molecular weight range of about 2,000-6,000. The polyurethane elastomer is prepared by injecting the above three agents through a RIM head into a mold cavity of the desired configuration. Reaction injection molded elastomers are useful as molded articles of commerce including, but not limited to, vehicle body parts.

REFERENCES:
patent: 3169934 (1965-02-01), Dennett et al.
patent: 3865762 (1975-02-01), Repiquet et al.
patent: 4048105 (1977-09-01), Salisbury
patent: 4065410 (1977-12-01), Schaefer et al.
patent: 4190711 (1980-02-01), Zdrahala et al.
H. Peebles, Jr. Macromolecules vol. 9, No. 1, Jan.-Feb. 1976, pp. 58-61.

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