Method for the preparation of molded polyurethane and polyurea a

Details Method for the preparation of molded polyurethane and polyurea a Method for the preparation of molded polyurethane and polyurea a

1989-10-23

1992-01-07

Kight, III, John

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521115, 521124, 521128, 524589, 524715, C08G 1814

Patent

active

050792709

ABSTRACT:
A method and composition are disclosed for the preparation of polyurethane and polyurea molded articles, particularly according to the RIM method, in which liquid polybutadiene with an average molecular weight of 1,500 to 6,000 is used as an internal release agent in an amount of 0.5 to 5% by weight, based on the reaction formulation. The release agent is highly effective and demolded products which contain this release agent can be painted over without formation of surface defects.

REFERENCES:
patent: 4251638 (1981-02-01), Reischl
patent: 4254228 (1981-03-01), Kleimann
patent: 4293456 (1981-10-01), Reischl
patent: 4721754 (1988-01-01), Baghdadchi
patent: 4797320 (1989-01-01), Kopp et al.
patent: 4868224 (1989-09-01), Harasin et al.
patent: 4886838 (1989-12-01), Dewhurst
patent: 4897428 (1990-01-01), Denhurst et al.
patent: 5002999 (1991-03-01), Lowery et al.

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