C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
117/161, 18/643
C08J 5/08 (2006.01) B29C 44/12 (2006.01) B29C 70/30 (2006.01) C08J 9/00 (2006.01) C08J 9/10 (2006.01)
Patent
CA 1074191
ABSTRACT Low density laminates of glass fiber reinforced unsatu- rated polyester resins are obtained by combining an unsaturated polyester resin syrup with an alpha hydroxy azo blowing agent immediately prior to spraying with randomly oriented chopped glass fibers which are thereupon collected on a substrate. The resin is cured on the substrate to produce a glass fiber reinforced laminate having a low density, that is, less than 75 percent of the density of a similar laminate produced from the same unsaturated polyester resin syrup in the absence of the alpha hydroxy azo blowing agent. Inert particulate fillers can be incorporated in the unsaturated polyester resin syrup. Alumina trihydrate is a preferred inert particulate filler. In one method, the unsaturated polyester resin syrup is mixed with the alpha hydroxy azo blowing agent immediately prior to forming a spray of the mixture. In another method, the unsaturated polyester resin syrup is formed into a first distinct spray and impinged upon a second distinct spray of the alpha hydroxy azo blowing agent. The two combined sprays are impinged against chopped glass fibers to produce the laminate.
250123
Cordts Howard P.
Grandlic Eugene J.
Freeman Chemical Corporation
Na
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