# US 10,370,463 B2 · Process for manufacturing chlorinated polyvinylchloride

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- Number: US 10,370,463 B2
- Document ID: US10370463B2
- Status: Granted
- Kind: B2
- Application number: 15/326,796
- Filed: 2015-07-21
- Published: 2017-07-27
- Granted: 2019-08-06
- Earliest claimed: 2014-07-22
- Assignees: Reliance Industries Limited
- Applicants: Reliance Industries Limited
- Inventors: Pradip Munshi; Ajit Behari Mathur; Ninad Deepak Ingle; Pradeep Paresh Kapadia; Raksh Vir Jasra
- Web page: https://patentgrep.com/patent/US10370463B2

## CPC

- C08F 8/22: by reaction with free halogens
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

The present disclosure provides a process for the chlorination of polyvinyl chloride. PVC obtained during the suspension polymerization reaction is directly used for chlorination without filtration, drying and re-slurrying. The present process is carried out in the absence of additional chemicals/reagents; also reheating during the chlorination reaction is not required. CPVC manufactured using the process of the present disclosure has whiteness index greater than 85, yellowness index lower than 4 and thermal stability in the range of 300 to 550 seconds at 210° C.

## Claims

### Claim 1

A process for the preparation of chlorinated polyvinyl chloride (CPVC); said process comprising the following steps:
i. polymerizing vinyl chloride in the presence of at least one dispersing agent, at a temperature in the range of 50 to 80° C. to obtain a reaction mixture, wherein the conversion of monomer is greater than 86%;
ii. separating unreacted vinyl chloride from said reaction mixture to obtain a slurry comprising polyvinyl chloride; and
iii. reacting said slurry with chlorine in the presence of at least one irradiation source of wavelength ranging from 254 to 530 nm, under agitation at a speed ranging from 100 to 1600 rpm, for a time period ranging from 2 to 12 hours while maintaining a temperature in the range of 50 to 80° C. to obtain chlorinated polyvinyl chloride (CPVC).

### Claim 2 (depends on 1)

The process as claimed in claim 1, wherein said dispersing agent in step (i) is polyvinyl alcohol.

### Claim 3 (depends on 1)

The process as claimed in claim 1, wherein said dispersing agent in step (i) is partially hydrolyzed polyvinyl alcohol.

### Claim 4 (depends on 1)

The process as claimed in claim 1, wherein said irradiation source in step (iii) is selected from the group consisting of ultra violet (UV) lamps, light-emitting diodes (LEDs) and LASERs.

### Claim 5 (depends on 1)

The process as claimed in claim 1, wherein said irradiation source in step (iii) has power ranging from 0.01 to 0.04 Watt/g of PVC.

### Claim 6 (depends on 1)

The process as claimed in claim 1, wherein said CPVC has whiteness index greater than 85, yellowness index lower than 4 and thermal stability in the range of 300 to 550 seconds at 210° C.