Continuous process for the preparation of highly stable, finely

Details Continuous process for the preparation of highly stable, finely Continuous process for the preparation of highly stable, finely

1996-10-03

1998-09-29

Zemel, Irina S.

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

Synthetic resins

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

525404, 525412, C08F28302

Patent

active

058146997

ABSTRACT:
A continuous process for the preparation of highly stable, finely divided, low viscosity polymer polyols of small average particle size wherein in the first step an intermediate is prepared by reacting (1) a mixture of at least two ethylenically unsaturated monomers, preferably styrene and acrylonitrile, in a mixture comprising (2) a base polyol and (3) a macromer in the presence of (4) a free radical initiator, (5) a solvent having moderate chain transfer activity, and, optionally, (6) a reaction moderator at a temperature of at least 100.degree. C., such that the intermediate contains at least about 12% by weight of macromer, based on the weight of the base polyol and macromer, and a solids content of at least about 15% by weight and less than about 30% by weight, based on the weight of the base polyol, macromer and ethylenically unsaturated monomers. The intermediate, which functions as a seed for further polymerization, is then further reacted, in one or more stirred-tank reactors in series, in a mixture of at least two ethylenically unsaturated monomers, preferably styrene and acrylonitrile, in a base polyol and, optionally, a macromer, in the presence of solvent, initiator and a reaction moderator which are distributed among the remaining reactors.

REFERENCES:
patent: Re33291 (1990-08-01), Ramlow et al.
patent: 4148840 (1979-04-01), Shah
patent: 4242249 (1980-12-01), Van Cleve et al.
patent: 4454255 (1984-06-01), Ramlow et al.
patent: 4458038 (1984-07-01), Ramlow et al.
patent: 4550194 (1985-10-01), Reichel et al.
patent: 4689354 (1987-08-01), Ramlow et al.
patent: 4690956 (1987-09-01), Ramlow et al.
patent: 4794151 (1988-12-01), Mueller-Mall et al.
patent: 4956427 (1990-09-01), Jenkins, III et al.
patent: 5223570 (1993-06-01), Huang et al.
patent: 5364906 (1994-11-01), Critchfield et al.
patent: 5594066 (1997-01-01), Heinemann et al.

Affiliated with

Also associated with

Rating

Continuous process for the preparation of highly stable, finely does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Continuous process for the preparation of highly stable, finely , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Continuous process for the preparation of highly stable, finely will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-687001