DETAILED DESCRIPTION OF THE INVENTION In this invention, the copolymer which does not generate any turbidity even after 72 hours in methylene chloride solution is especially preferred, although that which generates a little turbidity after 72 hours exhibits a satisfactory improving effect on the resistance to oxidation and solvent resistance and can be used for practical purposes.
For practical applications, the weight of the formed precipitate should be 5% by weight, preferably 1% by weight or below based on the original polymer weight at a time after 48 hours on the test.
The polyphenylene oxide as herein referred to is that having repeating units of the formula: ##STR1## wherein R.
sub.
1, R.
sub.
2, R.
sub.
3 and R.
sub.
4 are the same or different and are chosen from a hydrogen atom, a hydrocarbon group, a substituted hydrocarbon group, a halogen atom, a hydrocarbyloxy group, an amino group or a substituted amino group.
Specific examples include poly(2,6-dimethylphenylene-1,4-ether), poly(2,6-diethyl-phenylene-1,4-ether), poly(2,6-dipropylphenylene-1,4-ether), poly(2-methyl-6-allylphenylene-1,4-ether), poly(2,6-dimethoxyphenylene-1,4-ether), poly(2-methyl-6-chlorophenylene-1,4-ether), poly(2,6-dichloromethylphenylene-1,4-ether), poly(2-methyl-6-bromophenylene-1,4-ether), poly(2,5-dimethylphenylene-1,4-ether), poly(2,6-diphenylphenylene-1,4-ether) etc.
, as well as copolymers thereof.
Further, the copolymers of aniline compounds disclosed in Japanese Patent Application No.
42171/1980 are also included in this invention.
The number of the repeating units (n) is suitably not less than 50 but not higher than 350.
Preferably, it is in the range of 100-250.
Especially preferred is the range of 100-200.
The method to graft-copolymerize an acrylonitrile compound and a styrene compound to PPO may be any, for example, emulsion polymerization, bulk polymerization and the like.
Particularly, by using the gas-phase graft polymerization method disclosed in Japanese Patent laid open No.
34716/1981, a preferred acrylonitrile compound-styrene compound grafted PPO may be obtained
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