C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/4302
C08L 67/06 (2006.01) C08F 283/01 (2006.01) C08G 18/68 (2006.01)
Patent
CA 1305804
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 option- ally contain mineral fillers such as chopped glass fiber, are generally based upon unsaturated polyester resins having a high percentage of hydroxyl end groups, polymer- izable 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 com- pounds of the present invention for extended periods of time, e.g., several weeks.
590881
Fabris Hubert J.
Lenke Gerd M.
Melby Earl G.
Fabris Hubert J.
Gencorp Inc.
Lenke Gerd M.
Melby Earl G.
Smart & Biggar
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