Thermosetting resin compositions with low shrinkage
AssigneeGeneral Electric Company
InventorsTomoaki Shimoda, Kenichi Ishiwa
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Abstract
Thermosetting resin compositions with low shrinkage are provided, which when molded show low shrinkage rates, good dimensional stability (little cracking or warping), and excellent surface smoothness, mechanical strength, and dispersion stability. The thermosetting resin compositions with low shrinkage in accordance with the present invention comprise: (a) 100 wt. parts by weight thermosetting resins, and (b) 3 to 200 parts by weight polycarbonates containing constituent units derived from aromatic dihydroxy compounds. The polycarbonates preferably have at least 5% (of all the terminal groups) terminal hydroxyl groups derived from aromatic dihydroxy compounds. The polycarbonates also preferably have an intrinsic viscosity of 0.05 to 0.65 dL/g.
Claims12
A thermosetting resin composition comprising:
- a) 100 parts by weight of a thermosetting resin selected from the group consisting of unsaturated polyester resins, phenolic resins, urea resins and melamine resins, and
- b) 3-200 parts by weight of a polycarbonate resin having at least 5% hydroxy terminal groups derived from an aromatic dihydroxy compound, wherein the polycarbonate resin has an intrinsic viscosity measured at 20.degree. C. in methylene chloride of 0.05-1.0 dl/g.
Dependencies are inferred from the claim text.