Hydrolytic stable glass fiber reinforced polyester resins
AssigneeGeneral Electric Company
InventorJohannes van Helmond
Life of this patent
Estimating the term…
Abstract
A thermoplastic resin composition having improved hydrolytic stability having in admixture a saturated polyester resin such as polybutylene terephthalate, an epoxy novolac, a glass fiber reinforcing filler and a catalyst such as sodium stearate.
Claims9
A thermoplastic resin composition having improved hydrolytic stability comprising in admixture
- (a) a saturated polyester resin;
- (b) an epoxy novolac compound selected from the group consisting of ortho cresol novolac, epoxy para cresol novolac, epoxy phenol novolac and blends thereof;
- (c) glass fiber reinforcing filler;
- and
- (d) a catalyst
- wherein said catalyst is a salt free from direct carbon -phosphorous bonds and contains at least one ion selected from the group consisting of alkali metal cations, alkaline earth metal cations and halide anions.
A method for improving the hydrolytic stability of a thermoplastic polyester resin composition comprising compounding (a) a polyester resin, (b) an effective amount of a glass fiber reinforcing filler, (c) an effective amount of an epoxy novolac and (d) an effective amount of a catalyst.
Dependencies are inferred from the claim text.