Vinyl polymers produced by a two-stage procedure and their use a

Details Vinyl polymers produced by a two-stage procedure and their use a Vinyl polymers produced by a two-stage procedure and their use a

1993-05-27

1995-02-21

Jagannathan, Vasu S.

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

Synthetic resins

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

525285, 525286, 525293, 525296, 525301, 525302, C08F26502, C08F26504

Patent

active

053916310

ABSTRACT:
A vinyl polymer is obtainable by polymerizing vinyl monomers in at least two stages by a procedure in which, in a first stage, from 5 to 95% by weight of vinyl monomers are polymerized in an organic solvent or in the absence of a solvent and, in the second stage, from 5 to 95% by weight of the vinyl monomers are polymerized in the presence of the vinyl polymer obtained in the first stage, likewise in an organic solvent or in the absence of a solvent, with the proviso that the polymerization in the second stage is carried out under conditions under which an average molecular weight M.sub.n, which is at least 1,000 higher compared with that of the vinyl polymer, the first stage of results for the vinyl monomers of the second stage in the absence of the vinyl polymer obtained in the first stage.

REFERENCES:
patent: 4113803 (1978-09-01), Price
patent: 4758642 (1988-07-01), Yezrielev et al.
patent: 4855369 (1989-08-01), Yezrielev et al.

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