Process for the preparation of dry chlorinated polyvinyl chloride

US11267915B2 · kind B2 · utility

Assignee

• RELIANCE INDUSTRIES LIMITED · IN

Inventors

• Pradip Munshi · Vadodara, IN
• Ninad Deepak Ingle · Pune, IN
• Santosh Agrawal · Damoh, IN
• Uttam Maity · Narayanpur, IN
• Rakshvir Jasra · Vadodara, IN
• Sunil Peter · Thrissur, IN
• Vriti Singh · Jamkhed, IN
• Vishal Bhupendrakumar Shah · Amroli, IN
• Gordhan Das Goyal · Mumbai, IN

Key dates

• Filing date: Jan 19, 2018
• Grant date: Mar 8, 2022
• Expiry date: Apr 2, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K2201/014
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present disclosure provides an effective and efficient process for the preparation of a dry chlorinated polyvinyl chloride (CPVC), comprising introducing chlorine gas into slurry of polyvinyl chloride in water to obtain a reaction mixture; irradiating the reaction mixture to obtain a product mixture comprising CPVC and water solution including unreacted chlorine gas and hydrogen chloride; filtering the product mixture to obtain a first mass; adding water to the first mass for extracting unreacted chlorine gas and hydrogen chloride to obtain an aqueous suspension, and filtering the aqueous suspension to obtain a second mass; passing nitrogen through the second mass to extract residual water solution to leave behind a third mass; and agitating the third mass in a high-speed mixer together with a neutralizing agent, and optionally with a stabilizer and a processing additive to obtain dry thermally stable CPVC with thermal stability in the range of 1000 seconds to 1500 seconds.