Hydrolyzed ethylene-vinyl acetate copolymer

Details Hydrolyzed ethylene-vinyl acetate copolymer Hydrolyzed ethylene-vinyl acetate copolymer

1988-08-19

1990-06-05

Schofer, Joseph L.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 61, 525 62, C08F 1606

Patent

active

049315005

ABSTRACT:
A hydrolyzed ethylene-vinyl acetate copolymer having an ethylene content of 20 to 60% by mole and a defree of hydrolysis in the vinyl acetate component of at least 95% by mole, having an ash content of not more than 20 ppm and an alkali metal content of not more than 5 ppm, and having a ratio of the melt viscosity at 220.degree. C. after maintaining the copolymer at 220.degree. C. for 60 minutes to the melt viscosity at 220.degree. C. after maintaining the copolymer at 220.degree. C. for 5 minutes of 1.0 to 1.5. The hydrolyzed copolymer of the invention can give the films whose gas impermeability is not lowered even at high humidity, and is applicable to long-run molding.

REFERENCES:
patent: 3560461 (1971-02-01), Yonezu et al.
patent: 3890267 (1975-06-01), Fukushima et al.
patent: 4041223 (1977-08-01), Amemiya et al.
patent: 4367305 (1983-01-01), Satoh et al.
patent: 4611029 (1986-09-01), Takahashi
patent: 4719259 (1988-01-01), Jenkins

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