Resin composition and molded article

Abstract

A resin composition contains: 60 to 95% by mass of polyphenylene ether (A); 35 to 0% by mass of styrene-based resin (B); and 15 to 5% by mass of elastomer component (C). The component (C) is present as dispersion particles in the resin composition. The dispersion particles have a number average particle size of 0.04 to 0.25 μm.

1 . A resin composition comprising:
 60 to 95% by mass of polyphenylene ether (A);   35 to 0% by mass of styrene-based resin (B); and   15 to 5% by mass of elastomer component (C),   wherein   the styrene-based resin (B) is a non-rubber-reinforced styrene-based resin;   the elastomer component (C) comprises a block copolymer having a styrene block and a hydrogenated conjugated diene compound block;   the block copolymer is a styrene block-hydrogenated conjugated diene compound block copolymer having a molecular weight of 60,000 to 1,500,000 and having a bound styrene amount of 50 to 80% by mass;   the elastomer component (C) is present as dispersion particles in the resin composition;   the dispersion particles have a number average particle size of 0.04 to 0.25 μm,   dispersion particles having a particle size of greater than 1.0 μm are not present, and   the number of the dispersion particles having a particle size of 0.5 to 1.0 μm is 3 or less in an area corresponding to 396 μm 2  as measured by transmission electron microscopy.   
     
     
         2 . The resin composition according to  claim 1 , wherein the elastomer component (C) comprises an oil-extended styrene block-hydrogenated conjugated diene compound block copolymer. 
     
     
         3 . The resin composition according to  claim 1 , wherein the elastomer component (C) comprises an oil-extended styrene block-hydrogenated conjugated diene compound block copolymer having an oil-extended amount of 20 to 50% by mass. 
     
     
         4 . The resin composition according to  claim 2 , wherein the elastomer component (C) comprises the oil-extended styrene block-hydrogenated conjugated diene compound block copolymer having an oil-extended amount of 20 to 50% by mass and an olefin-based elastomer in a mass ratio of (the oil-extended styrene block-hydrogenated conjugated diene compound block copolymer having an oil-extended amount of 20 to 50% by mass: the olefin-based elastomer) =9:1 to 3:7. 
     
     
         5 . The resin composition according to  claim 2 , wherein the resin composition comprises 15 to 100 parts by mass of an oil based on 100 parts by mass of the styrene block-hydrogenated conjugated diene compound block copolymer. 
     
     
         6 . The resin composition according to  claim 1 , wherein the component (C) comprises a styrene block-hydrogenated conjugated diene compound block copolymer and/or an oil-extended styrene block-hydrogenated conjugated diene compound block copolymer and an olefin-based elastomer in a mass ratio of (the styrene block-hydrogenated conjugated diene compound block copolymer and/or the oil-extended styrene block-hydrogenated conjugated diene compound block copolymer/the olefin-based elastomer)=9:1 to 3:7, and
 the resin composition comprises 15 to 100 parts by mass of an oil based on 100 parts by mass of the styrene block-hydrogenated conjugated diene compound block copolymer.   
     
     
         7 . A molded article for a light-reflecting part comprising the resin composition according to  claim 1 . 
     
     
         8 . A molded article for an automotive lamp extension comprising the resin composition according to  claim 1 . 
     
     
         9 . The resin composition according to  claim 2 , wherein the component (C) comprises the oil-extended styrene block-hydrogenated conjugated diene compound block copolymer and an olefin-based elastomer in a mass ratio of (the oil-extended styrene block-hydrogenated conjugated diene compound block copolymer/the olefin-based elastomer)=9:1 to 3:7.