Patent ID: 7544741

Claim:
A polyphenylene ether resin composition comprising a polyphenylene ether and a styrene polymer resin, the content of said polyphenylene ether in said composition being from 10 to 90% by weight, said polyphenylene ether having a polymer chain comprising recurring units each represented by the following formula (1): said composition being characterized in that the polyphenylene ether, when isolated from the composition and purified, has the following characteristics (a), (b) and (c): (a) when dissolved in deuterated chloroform and analyzed by proton nuclear magnetic resonance spectroscopy ( 1 H-NMR) using tetramethylsilane as a reference for chemical shift, said isolated and purified polyphenylene ether exhibits a triplet signal (S 1 ) at 3.55 ppm, said triplet signal (S 1 ) having a relative intensity of 0.05 to 0.25 in terms of the percentage of the integrated intensity of said triplet signal (S 1 ), based on the integrated intensity of a signal (S 2 ) observed at 6.47 ppm; (b) when a 0.05 g/ml solution of said isolated and purified polyphenylene ether in chloroform is analyzed by ultraviolet-visible spectroscopy using a cell having an optical path of 1 cm, said polyphenylene ether exhibits an absorbance of from 0.01 to 0.40 at a wavelength of 480 nm; and (c) said isolated and purified polyphenylene ether has a weight average molecular weight of from 30,000 to 100,000 as measured by gel permeation chromatography using a calibration curve obtained with respect to standard monodisperse polystyrene samples.