Process for rendering ethylene-vinyl acetate copolymers agglomer

Details Process for rendering ethylene-vinyl acetate copolymers agglomer Process for rendering ethylene-vinyl acetate copolymers agglomer

1976-09-09

1978-03-07

Levin, Stanford M.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 8, 526331, C08F 812

Patent

active

040781283

ABSTRACT:
Tacky ethylene-vinyl acetate copolymers having about 35-95% by weight vinyl acetate content are rendered agglomeration-resistant by surface treatment thereof, before, during, or after forming into particles, with a basic liquid medium to hydrolyze not more than about 10% by weight of the vinyl acetate groups originally present in the copolymer, the hydrolysis being mainly confined to the surface of the particles without effecting any significant hydrolysis of the interior of the particles. Previously agglomerated particles of ethylene-vinyl acetate copolymers containing about 35-60% by weight of vinyl acetate are deagglomerated and rendered agglomeration-resistant by a similar treatment with a basic liquid medium. Non-pelletizable, tacky ethylene-vinyl acetate copolymers containing about 60-95% by weight of vinyl acetate are rendered agglomeration-resistant, and hence pelletizable, at the expense of the hydrolysis of not more than about 10% by weight of the vinyl acetate groups present, by similar treatment before or during particle formation.

REFERENCES:
patent: 3510463 (1970-05-01), Bristol
patent: 3746681 (1973-07-01), McClain
patent: 3780004 (1973-12-01), Hoyt et al.

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