Ethylene copolymers for hot melt systems

Details Ethylene copolymers for hot melt systems Ethylene copolymers for hot melt systems

1982-09-30

1985-02-05

Cockeram, Herbert S.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

524 77, 524187, 524270, 524563, C08F21802

Patent

active

044979410

ABSTRACT:
Ethylene-vinyl acetate copolymers having a melt index of 700 to 10000 and containing from 11 to 40% vinyl acetate are useful in hot melt systems and particularly in formulating low viscosity hot melt adhesives, preferably in binary compositions with natural or synthetic resin tackifiers. The adhesives show long open times with short setting times, and excellent adhesive properties.
The EVAs are prepared by a high pressure polymerization, preferably by using chain transfer agent such as isobutylene to achieve high melt indices.

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patent: 3758431 (1973-09-01), Taft et al.
patent: 4048411 (1977-09-01), Mietzner et al.
patent: 4239563 (1980-12-01), Iacoviello
patent: 4260722 (1981-04-01), Pfleger
patent: 4367113 (1983-01-01), Karim et al.

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