Resin composition containing polyphenylene oxide

A resin composition containing a polyphenylene oxide, comprising

• (A) a polyphenylene oxide having the following formula and having a molecular weight of 10,000 or higher:
• ##STR4## wherein R.sub.1 and R.sub.2 are lower, straight chain alkyl groups of 1-4 carbon atoms;
• each of R.sub.3 and R.sub.4 is a hydrogen atom or has the same meaning as defined above for R.sub.1 and R.sub.2 ;
• the .alpha.-carbon atom in each R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is not tertiary;
• n is an integer such that the molecular weight is 10,000 or more;
• and
• (B) a thermoplastic modified aromatic hydrocarbon formaldehyde resin, which is obtained by reacting an aromatic hydrocarbon formaldehyde resin having a number average molecular weight of 500 or higher with at least one member selected from the group consisting of phenol, p-tert-butylphenol, p-octylphenol and p-nonylphenol in the presence of an acid catalyst, the weight ratio of said resin (A) to said resin (B) being from 10:90 to 99:1.