DETAILED DESCRIPTION OF THE INVENTION The polyphenylene ether used in the component (a) in the present invention is a polymer which can be obtained, for example, by oxidation polymerization of one or more phenol compounds having the formula (I) ##STR1## wherein R.
sub.
1, R.
sub.
2, R.
sub.
3, R.
sub.
4 and R.
sub.
5 each represents a hydrogen atom, a halogen atom, a substituted or unsubstituted hydrocarbon residue, or a substituted or unsubstituted hydrocarbon oxy group provided that at least one of R.
sub.
1, R.
sub.
2, R.
sub.
3, R.
sub.
4 and R.
sub.
5 is a hydrogen atom, with oxygen or gas containing the same in the presence of an oxidation coupling catalyst.
Examples of R.
sub.
1 to R.
sub.
5 are a hydrogen atom, a chlorine atom, a bromine atom, a fluorine atom, an iodine atom, a methyl group, an ethyl group, an n- or isopropyl group, a pri.
-, sec.
- or tert.
-butyl group, a chloroethyl group, a hydroxyethyl group, a phenylethyl group, a benzyl group, a hydroxymethyl group, a carboxyethyl group, a methoxycarbonylethyl group, a cyanoethyl group, a phenyl group, a chlorophenyl group, a methylphenyl group, a dimethylphenyl group, an ethylphenyl group and an allyl group.
Examples of the phenol compounds are phenol, o-, m- or p-cresol, 2,6-, 2,5-, 2,4- or 3,5-dimethylphenol, 2-methyl-6-phenylphenol, 2,6-diphenylphenol, 2,6-diethylphenol, 2-methyl-6-ethylphenol, 2,3,5-, 2,3,6- or 2,4,6-trimethyl-phenol, 3-methyl-6-tert.
-butylphenol, thymol and 2-methyl-6-allylphenol.
Alternatively, copolymer of any of the phenol compound listed above and the other phenol compound, for example, polyhydroxy aromatic compound, may be employed.
The polyhydroxy aromatic compound is, for example, bisphenol A, tetrabromobisphenol A, resorcin, hydroquinone and novolak resin.
Preferred examples of the polymers are homopolymer of 2,6-dimethylphenol or 2,6-diphenylphenol and copolymers of a large amount of 2,6-dimethylphenol and a small amount of 3-methyl-6-tert.
-butylphenol or of 2,3,6-trimethylphenol.
Any oxidation coupling catalyst may be employed for oxidation polymerization of phenol compound, as long as it has polymerization ability
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Gutter-related 
