Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1985-02-13
1987-01-13
Anderson, Philip
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
264 453, 264 455, 264 53, 264 54, 264300, 2643286, 264DIG83, 4283155, 4283188, 521 51, 528 64, C08G 1814, C08G 1832, B29C 6722
Patent
active
046365311
ABSTRACT:
The invention relates to a process for the preparation of cellular, microcellular and noncellular polyurethane polyurea molded parts through the reaction of organic polyisocyanates, polyols having at least 2 reactive hydrogen atoms, and a chain extender containing at least 70 percent by weight of a mixture of aromatic diamines comprising from 80 to 50 weight percent of at least one primary aromatic diamine whose amino groups are sterically hindered relative to reaction with polyisocyanates, and 20 to 50 weight percent of at least one unsubstituted or substituted reactive primary aromatic diamine whose amino groups do not exhibit reduced reactivity to polyisocyanates.
These reactive mixtures produce polyurethane polyurea polymers with excellent demoldability without the use of external mold release agents.
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Prepelka, David J. and James L. Wharton, "Reaction Injection Molding in the Automotive Industry," in Journal of Cellular Plastics, vol. 11, No. 2, Mar./Apr. 1975, pp. 87-98.
Schmidt Hans U.
Werner Frank
Anderson Philip
BASF - Aktiengesellschaft
Conger William G.
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