Method for preparing chlorinated polyvinyl chloride resin
US11629204B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 2018 |
| Grant date | Apr 18, 2023 |
| Priority date | — |
| Expiry date | Nov 16, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/22
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Provided is a method for preparing a chlorinated polyvinyl chloride resin, and more particularly, a method for preparing a chlorinated polyvinyl chloride resin including a neutralization process for neutralizing to pH of 2 to 5 using metal hydroxide as a first neutralizing agent a), and completing neutralization using a carbonate-based compound as a second neutralizing agent b), wherein residual hydrochloric acid in pores of the chlorinated polyvinyl chloride resin obtained by chlorination of a polyvinyl chloride or a vinyl chloride-based copolymer may be efficiently removed, and thermal stability and extrusion appearance of processed articles may be improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.