POLY(PHENYLENE ETHER) COMPOSITION AND ARTICLE

摘要

A composition is prepared by melt blending specific amounts of components including a poly(phenylene ether), a first hydrogenated block copolymer (HBC1) that includes a polystyrene-poly(ethylene-butylene)-polystyrene triblock copolymer having a polystyrene content of 50 to 75 weight percent, and a second hydrogenated block copolymer. The second hydrogenated block copolymer can selected from five different hydrogenated block copolymer types and their combinations. The composition exhibits high light transmittance, low haze, and high impact strength at low temperature, which make it useful for molding objects such as containers for storage in refrigerators and freezers.

主权项

1. A composition comprising the product of melt blending components comprising:
29 to 95.5 weight percent of a poly(phenylene ether); 4 to 50 weight percent of a first hydrogenated block copolymer (HBC1) comprising a polystyrene-poly(ethylene-butylene)-polystyrene triblock copolymer having a polystyrene content of 50 to 75 weight percent; and a second hydrogenated block (HBC2) copolymer comprising
(HBC2a) 0.5 to 18 weight percent of a polystyrene-poly(ethylene-butylene-styrene)-polystyrene triblock copolymer having a polystyrene content of 50 to 65 weight percent and a weight average molecular weight of 200,000 to 400,000 atomic mass units, wherein the first hydrogenated block copolymer and the second hydrogenated block copolymer are present in a weight ratio of 1:1 to 15:1;(HBC2b) 2 to 10 weight percent of a polystyrene-poly(ethylene-butylene-styrene)-polystyrene triblock copolymer having a polystyrene content of 55 to 65 weight percent and a weight average molecular weight of 100,000 to 190,000 atomic mass units, wherein the first hydrogenated block copolymer and the second hydrogenated block copolymer are present in a weight ratio of 2:1 to 4:1, and wherein the melt blended components further comprise 0.2 to 1.5 weight percent of a C3-C24 alpha-hydroxyketone;(HBC2c) 1 to 5 weight percent of a polystyrene-poly(ethylene-butylene-styrene)-polystyrene triblock copolymer having a polystyrene content of 33 to 47 weight percent, wherein the second hydrogenated block copolymer and the first hydrogenated block copolymer are present in a weight ratio of 2:1 to 15:1;(HBC2d) 1 to 20 weight percent of a polystyrene-poly(ethylene-butylene)-polystyrene triblock copolymer having a polystyrene content of 20 to 37 weight percent and a weight average molecular weight of 50,000 to 200,000 atomic mass units, wherein the second hydrogenated block copolymer and the first hydrogenated block copolymer are present in a weight ratio of 2:1 to 7:1, provided that when the first hydrogenated block copolymer amount is greater than or equal to 10 weight percent, the weight ratio of the second hydrogenated block copolymer and the first hydrogenated block copolymer is less than 5:1; or(HBC2e) 0.5 to 15 weight percent of a polystyrene-poly(ethylene-butylene)-polystyrene triblock copolymer having a polystyrene content of 38 to 48 weight percent, wherein the first hydrogenated block copolymer and the second hydrogenated block copolymer are present in a weight ratio of 1.25:1 to 25:1, wherein the melt blended components further comprise 0.2 to 0.7 weight percent of a C3-C24 alpha-hydroxyketone, provided that when the amount of the polystyrene-poly(ethylene-butylene)-polystyrene triblock copolymer having a polystyrene content of 38 to 48 weight percent is 0.5 weight percent, the amount of the first hydrogenated block copolymer is greater than 5 weight percent, and provided that the sum of the first hydrogenated block copolymer and the polystyrene-poly(ethylene-butylene)-polystyrene triblock copolymer having a polystyrene content of 38 to 48 weight percent is less than 46 weight percent; wherein the melt blended components comprise 0 to 0.5 weight percent polyolefins; provided that when the melt blended components comprise (HBC2b), the maximum amount of the poly(phenylene ether) is 94 weight percent; and provided that when the melt blended components comprise (HBC2c) or (HBC2d), the maximum amount of the poly(phenylene ether) is 95 weight percent.