TH318B - Color reduction of styrene acrylonitrile polymers - Google Patents

Abstract

The decolorization process for styrene-acrylonitrile polymers consists of polymerization. A chain of starting substances which contains styrene and acrylonitril monomer. By selecting to mix with dilution agent with Persiarie-Aliphatic-Lafa-phyano-Achoalkanes. asymmetrical type be a catalyst This chain of starting substance is almost oxygen-free. and allow this starting line to be in the polymerization region for a specified time.

Claims (9)

1. In the polymerization process, many substances from this starter line consist of monomers consisting of 20 to approximately 80 parts acrylonitril by weight. Styrene from approximately 80 to approximately 20 parts by weight and dilution from approximately 0 to approximately 30 parts by weight. This starting line passes into the polymerization zone, which maintains the temperature of this initiator line from approximately 120C to approximately 170C under pressure from approximately 10 to approximately 300 psi ( 0.7 - 20.4 atmospheres) and at least in part The line of initiators can polymerize. The polymers are then heated under vacuum sufficient to remove much of the non-polymerized portion of the starter and diluent line. Improving is done by adding Tertciery-Aliphatic-Alpha-Cheyano-Echalkane. Asymmetric to act as a catalyst to polymerize into the starter chain, amounts from approximately 80 to approximately 700 ppm by weight of the starter. Maintain the level of oxygen in the line Of the starting substance as it passes through the polymerization zone While this line of initiators is polymerized. Not to cause about 20 parts per million by the weight of the starting substance; And allow the time for the initiating line to be in the polymerization zone from approximately 0.7 to approximately 1.4 hours. 2. Process of claim number 1, in which the cyanoasoalkane has the formula (chemical formula) 3. Process of claim No. 1, which Cyanoasoalkane Is 1-thur-chieri-butis azo-1-cyanoiclexeb. 4. Process of claim No. 1, which Cyanoasoalkane Is 1- Ter-Shieri-Ebil Echo-1-Cyanoviccolexeb. 5. Process of claim No. 1, which Cyanoasoalkane Is 2-tert-chieri-butis azo-1-cyanobutane. 6. Process of claim No. 1, which the Cyanoasoalkane Is 2-tert-chieri-butis azo-1-cyanobutane. 7. Process of any of the claims 1 to 6 in which the diluent is ethibenzene. 8. Procedure for any of the claims 1 to 7 in which the level of oxygen in the line of the initiating substance into the polymerized zone does not exceed 5 ppm of the weight of the starter substance. 9. Polymerization Process Many substances from the starter line This starter chain consists of a monomer containing approximately 20 to approximately 80 parts acrylonitril. Styrene from approximately 80 to approximately 20 parts by weight and ethylbenzene from approximately 15 to approximately 25 parts by weight. This line of initiating substances passes through the polymerization zone. It maintains the temperature of this starter from about 135 C to about 155 C under pressure from about 100 to approximately 200 lb per square inch (7.0-14.0 atmospheres) and at least part of the polymer starter line. Arise made polymers The polymers were then heated under vacuum sufficient to remove much of the non-polymerized portion of the starter and diluent line. The improvement was made by adding 1-thercia-butyl-echo-1-wi-cycloexane as a polymerization agent in the line of the substance. Starting from approximately 200 to approximately 500 ppm by line weight of the starting substance. Maintain the level of oxygen in the initiating line as it passes through the polymerization zone. While the above mentioned reactants polymerize no more than approximately 5 parts by weight per million by weight of the starter line. And allow the time for the intersection to begin in the polymerization zone from approximately 0.9 to 1.2 hours (9 claims, 2 pages, 0 photos).