Thickened molding resin compositions and cured molded compounds

Details Thickened molding resin compositions and cured molded compounds Thickened molding resin compositions and cured molded compounds

1988-05-27

1989-09-19

Short, Patricia

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523527, 525 28, 525419, 525449, C08L 6706

Patent

active

048682314

ABSTRACT:
Sheet molding compounds are thickened (or maturated) via "in situ" formation of polyureas made from aromatic primary diamines with reduced basicity and diisocyanates. The molding compounds, which can optionally contain mineral fillers such as chopped glass fiber, are generally based upon unsaturated polyester resins having a high percentage of hydroxyl end groups, polymerizable vinyl compounds such as styrene, and the like. The thickened compositions are tack-free and compression moldable after less than one day, typically after less than several hours, into permanently shaped, strong rigid articles, such as automotive body parts. A viscosity plateau is reached and maintained by the maturated compounds of the present invention for extended periods of time, e.g., several weeks.

REFERENCES:
patent: 4073828 (1978-02-01), Ferrarini et al.
patent: 4129641 (1978-12-01), Ferrarini et al.
patent: 4296020 (1981-10-01), Magrans, Jr.

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