Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1991-04-05
1992-09-01
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
523514, 524277, 524494, 524513, C08K 509
Patent
active
051439646
ABSTRACT:
A moldable unsaturated polyester resin composition having improved antishrinking and shape-retaining properties contains an unsaturated polyester resin/styrene mixture, fillers, glass fibers, an antishrinkage agent and a demolding agent, wherein the demolding agent is calcium montanate and wherein the antishrinkage agent is preferably a methyl methacrylate polymer. The composition is particularly useful for the manufacture of lamp reflectors having superior shape and weight retention integrity and reduced reflector surface fogging.
REFERENCES:
patent: 4140670 (1979-02-01), Charles et al.
patent: 4284736 (1981-08-01), Comstock et al.
patent: 4425287 (1984-01-01), Hesse et al.
patent: 4622354 (1986-11-01), Iseler et al.
patent: 4835213 (1989-05-01), Murai et al.
Behar Gilles
Martinet Alain
Oginski Jean-Claude
Cray Valley SA
Michl Paul R.
Yoon Tae H.
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