Process of rendering copolymer powders of maleic anhydride and a

Details Process of rendering copolymer powders of maleic anhydride and a Process of rendering copolymer powders of maleic anhydride and a

1989-10-02

1990-10-09

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528491, 526271, C08F 600

Patent

active

049621858

ABSTRACT:
Substantially benzene-free copolymers of maleic anhydride and alkyl vinyl ethers having benzene present in an amount of less than 1 ppm and toluene present in an amount of about 2.0 wt. % or less are provided by treating the copolymer powder with toluene at a temperature of about 115.degree. C. to about 125.degree. C.

REFERENCES:
patent: 3318851 (1967-05-01), Nicholls et al.
patent: 4532320 (1985-07-01), Denzinger et al.

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