Molding materials based on polyvinyl chloride and polyphenylene oxide

A thermoplastic molding composition consisting of a blend of

• a. 30-90% by weight of polyvinyl chloride or of copolymers of vinyl chloride with up to 30% by weight based on the weight of the copolymer of one or more other copolymerizable vinyl compounds,
• b. about 10-70% by weight of a polyphenylene oxide based on 2,6-dimethylphenol having a molecular weight, M.sub.w, of between about 40,000 and 100,000, and
• c. an impact modifier selected from the group consisting of natural rubber, synthetic rubber and rubber modified thermoplastic resins.

A thermoplastic molding composition consisting of a blend consisting of

• a. 30-90% by weight of polyvinyl chloride or of copolymers of vinyl chloride with up to 30% by weight based on the weight of the copolymer of one or more other copolymerizable vinyl compounds, and
• b. about 10 - 70% by weight of a polyphenylene oxide based on 2,6-dimethylphenol having a molecular weight, M.sub.w, of between about 40,000 and 100,000
• and additives selected from the group consisting of pigments, fillers, glass fibers, antistatic agents, flameproofing agents, blowing agents and stabilizers.

The composition according to claim 14 wherein about 5-35% by weight, based on the total composition of said impact modifier is present.

A process for improving the heat distortion properties of polyvinyl chloride consisting of mixing it with 10 to 70 wt. % of polyphenylene oxide based on 2,6-dimethylphenol having a molecular weight, M.sub.w, of between about 40,000 and 100,000 and with additives selected from the group consisting of pigments, fillers, glass fibers, antistatic agents, flameproofing agents, blowing agents and stabilizers.

A thermoplastic molding composition consisting of a blend consisting of

• a. 70-30% by weight of a polyvinyl chloride homopolymer with a K-value of about 50 to 80, with
• b. about 30 to 70% by weight of poly(2,6-dimethyl-1,4-phenylene oxide) having a molecular weight, M.sub.w of about 40,000 to 100,000
• and additives selected from the group consisting of pigments, fillers, glass fibers, antistatic agents, flameproofing agents, blowing agents and stabilizers which is produced by either dissolution in and isolation from a common solvent or solvent system or mechanical mixing at temperatures between about 180 to 260.degree. C.