Process for toughening ethylene-vinyl acetate copolymers and res

Details Process for toughening ethylene-vinyl acetate copolymers and res Process for toughening ethylene-vinyl acetate copolymers and res

1977-05-09

1979-05-22

Hamrock, William F.

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

Synthetic resins

Effecting a change in a polymerization process in response...

526 476, 526 481, 526 521, 526 522, C08F 806

Patent

active

041560620

ABSTRACT:
A process for toughening ethylene-vinyl acetate copolymers is disclosed which comprises reacting a rubbery ethylene-vinyl acetate copolymer with oxygen at elevated temperature in the presence of a catalytically effective amount of at least one catalyst selected from the group consisting of an alkali metal, ammonium or zinc salt of a weak aliphatic carboxylic acid, an alkali metal, ammonium or zinc salt of a weak aromatic carboxylic acid, an aliphatic tertiary amine, and an aromatic tertiary amine, for a period sufficient to provide an ethylene-vinyl acetate copolymer demonstrating an appreciable increase in melt viscosity as indicated by a corresponding decrease in melt flow rate compared with that of the starting copolymer.

REFERENCES:
patent: 3267083 (1966-08-01), Imhof
patent: 3322734 (1967-05-01), Walkin
patent: 3756999 (1973-09-01), Stetter et al.
patent: 4042766 (1977-08-01), Tatsukami

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