Process for the production of a cellular composite plastic part

Details Process for the production of a cellular composite plastic part Process for the production of a cellular composite plastic part

1984-07-23

1986-04-15

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 464, 264255, 264300, 264DIG83, B29C 6722

Patent

active

045826587

ABSTRACT:
A first reaction mixture, prepared from (a) isocyanates with isocyanate contents of from 5 to 50% and (b) compounds with molecular weights of from 32 to 10,000 which contain at least two isocyanate-reactive hydrogen atoms, in an equivalent ratio of component "a" to component "b" of 0.8:1 to 5:1, from 0.1 to 20% of a blowing agent and, optionally, other known additives, is introduced into the rigid cavity of a closed mold. After this mixture has become resistant to permeation, but is still compressible, a second reaction mixture, either the same or different from the first reaction mixture, prepared from (c) isocyanates having isocyanate contents of from 5 to 50% and (d) compounds with molecular weights of from 32 to 10,000 which contain at least two isocyanate-reactive hydrogen atoms, in an equivalent ratio of component "c" to component "d" of from 0.8:1 to 5:1, specific internal mold release agents and optionally blowing agents and other additives, is introduced into the mold, such that it surrounds the first mixture and compresses it. A third, optional, reaction mixture, the same as or different from the second mixture, may also be employed in a manner similar to the introduction of the second mixture. The final composite plastic part releases smoothly from the mold.

REFERENCES:
patent: 3954926 (1976-05-01), Pahl et al.
patent: 4058492 (1977-11-01), von Bonin et al.
patent: 4081578 (1978-03-01), Essen et al.
patent: 4220727 (1980-09-01), Godlewski
patent: 4254228 (1981-03-01), Kleimann et al.
patent: 4487912 (1984-12-01), Zimmerman et al.

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