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US 5,175,212 AGranted
Low temperature toughening of polycarbonates with a modified block copolymer
AssigneeShell Oil Company
InventorMichael J. Modic
Life of this patent
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Abstract
Toughened polycarbonate compositions are obtained by blending from 2 to 10 parts by weight of a modified block copolymer with from 90 to 98 parts by weight of a polycarbonate. The modified block copolymers have at least one hydrogenated conjugated diene block and at least one vinyl aromatic block, and are free-radically grafted with an effective amount of hydroxyethylacrylate to give a 1/8 inch notched Izod impact strength of greater than 4.0 ft-lb/in at -40.degree. F.
Claims10
A toughened polycarbonate composition consisting essentially of:
- from 2 to 10 parts by weight of a modified block copolymer comprising at least one hydrogenated conjugated olefin block and at least one vinyl aromatic block;
- and
- from 90 to 98 parts by weight of a polycarbonate;
- wherein the modified block copolymer comprises from about 0.3 to about 10.0 percent by weight of hydroxyethylacrylate to give the polycarbonate composition a 1/8" notched Izod impact strength of 4.0 ft-lb/in or greater as determined by ASTM-D256 at -40.degree. F.
1 more element
A toughened polycarbonate composition consisting essentially of:
- from 2 to 10 parts by weight of a modified block copolymer comprising a structure of polystyrene-hydrogenated polybutadiene-polystyrene;
- and
- from 90 to 98 parts by weight of a polycarbonate;
- wherein the modified block copolymer comprises from about 0.3 to about 10.0 percent by weight of hydroxyethylacrylate to give the polycarbonate composition a 1/8" notched Izod impact strength of 4.0 ft-lb/in or greater as determined by ASTM-D256 at -40.degree. F.
1 more element
Dependencies are inferred from the claim text.