Process for making vinyl pyrrolidone/vinyl acetate...

Details Process for making vinyl pyrrolidone/vinyl acetate... Process for making vinyl pyrrolidone/vinyl acetate...

2005-09-06

2005-09-06

Pezzuto, Helen L. (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S071000, C526S212000, C526S264000, C526S330000

Reexamination Certificate

active

06939927

ABSTRACT:
Vinyl pyrrolidone/vinyl acetate copolymers having a very low residual vinyl pyrrolidone monomer level, i.e. <100 ppm, preferably only 50 ppm, are made within an advantageously short production cycle, by post-treating an aqueous solution of the copolymer at an elevated temperature of about 120–150° C., preferably about 130° C., under pressure, in the presence of a high temperature initiator, for a period of about 1–4 hours, preferably 2 hours.

REFERENCES:
patent: 5239053 (1993-08-01), Tseng et al.
patent: 5319041 (1994-06-01), Zhong et al.
patent: 5387641 (1995-02-01), Yeung et al.
patent: 5395904 (1995-03-01), Zhong et al.
patent: 5502136 (1996-03-01), Zhong et al.
patent: 5534564 (1996-07-01), Zhong et al.

Affiliated with

Also associated with

Rating

Process for making vinyl pyrrolidone/vinyl acetate... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for making vinyl pyrrolidone/vinyl acetate..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for making vinyl pyrrolidone/vinyl acetate... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3431842