Method of degassing polymers prepared by mass polymerizing a mon

Details Method of degassing polymers prepared by mass polymerizing a mon Method of degassing polymers prepared by mass polymerizing a mon

1978-02-16

1980-08-12

Henderson, C. A.

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

Synthetic resins

Treating polymer containing material or treating a solid...

526 75, 5263441, 528483, 528501, 528503, C08F 628, C08F 1406

Patent

active

042174449

ABSTRACT:
An improved method of degassing polymers and copolymers prepared by mass polymerizing a monomeric composition, based on vinyl chloride. The polymer is kept under agitation, the monomeric composition to be eliminated is brought from polymerization pressure to a pressure below 120 mm of mercury, the polymer is brought to or kept at a temperature of at least 70.degree. C. and below the temperature at which degradation of the polymer or copolymer commences, and these conditions of pressure and temperature are maintained substantially until the degassing process stops, the polymer being put into contact with a quantity of water representing 0.01 to 0.8% and preferably 0.05 to 0.5% of its weight, after the residual monomeric vinyl chloride content of the polymer or copolymer has been reduced below 2000 ppm. The polymers and copolymers obtained, before being placed in open air, have a residual monomeric vinyl chloride content which is less than 50 ppm, generally less than 20 ppm and may be as little as 1 ppm.

REFERENCES:
patent: 3793259 (1974-02-01), Brinkmann
patent: 3956249 (1976-05-01), Goodman

Affiliated with

Also associated with

Rating

Method of degassing polymers prepared by mass polymerizing a mon does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of degassing polymers prepared by mass polymerizing a mon, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of degassing polymers prepared by mass polymerizing a mon will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2183465