Preparation of chlorinated polyvinyl chloride

Patent metadata

Field	Value
Publication number	US-10035865-B2
Application number	US-201515326810-A
Country	US
Kind code	B2
Filing date	Jul 21, 2015
Priority date	Jul 22, 2014
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

The present disclosure relates to a process for the preparation of CPVC which includes reacting PVC with chlorine at a pre-determined temperature in the presence of at least one irradiation source having wavelength ranging from 254 and 530 nm while maintaining the radiant flux from 1.5 to 2 W/kg of PVC, irradiance at 0.13 W/cm 2 and the number of photons emitted per second from 3×10 18 to 5×10 18 , under agitation, for a time period ranging from 3 to 4 hours to obtain CPVC. The CPVC prepared from the afore-stated process has a whiteness index ranging from 89 to 96, a yellowness index ranging from 1.23 to 1.73 and stability ranging from 648 to 684 seconds. The rate of the chlorination reaction after employing the afore-stated process parameters ranges from 1.6 to 4.36 mole/hour/kg.

First claim

The invention claimed is:

1. A process for the preparation of chlorinated polyvinyl chloride (CPVC) comprising reacting polyvinyl chloride (PVC) with chlorine at a pre-determined temperature in the presence of at least one irradiation source having wavelength ranging from 254 and 530 nm while maintaining the radiant flux from 1.5 to 2 W/kg of PVC, irradiance at 0.13 W/cm 2 and the number of photons emitted per second from 3×10 18 to 5×10 18 , under agitation, for a time period ranging from 3 to 4 hours to obtain CPVC,
said obtained CPVC being characterized by a whiteness index ranging from 89 to 96, a yellowness index ranging from 1.23 to 1.73 and thermal stability at 210° C. ranging from 648 to 684 seconds.

2. The process as claimed in claim 1 , wherein said PVC is in at least one form selected from the group consisting of PVC in completely dried form characterized by 0.2 to 1% loss on heating at 70° C. for 2 hours and PVC in slurry form having concentration ranging from 10 to 30% w/v.

3. The process as claimed in claim 1 , wherein the porosity of said PVC ranges from 0.26 to 0.28 ml/g.

4. The process as claimed in claim 1 , wherein said irradiation source is a narrow spectral band width source having a wavelength in the range of 254 to 530 nm.

5. The process as claimed in claim 1 , wherein said pre-determined temperature ranges from 50 to 90° C.

Assignees

• Reliance Industries Ltd

Inventors

• Munshi Pradip
• Vora Jayesh Prafullachandra
• Ingle Ninad Deepak
• Kapadia Pradeep Paresh
• Jasra Raksh Vir
• Rajan Shashikant

Classifications

• C08F8/22 Primary

  by reaction with free halogens · CPC title

• C08J2327/06

  Homopolymers or copolymers of vinyl chloride · CPC title

• C08J7/126

  Halogenation · CPC title

• C08J3/28

  Treatment by wave energy or particle radiation · CPC title