Method for preparing chlorinated polyvinyl chloride resin
AssigneeHanwha Solutions Corporation
InventorsYang Jung Kim, Ki Won Hong, Woo Young Lee, Seon Jeong Jin
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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.
Claims8
A method for preparing a chlorinated polyvinyl chloride resin, comprising:
- a preparation process of a chlorinated polyvinyl chloride resin by performing chlorination of a polyvinyl chloride or a vinyl chloride-based copolymer;
- and
- a neutralization process of the chlorinated polyvinyl chloride resin by adding neutralizing agents to the chlorinated polyvinyl chloride resin;
- wherein the neutralization process comprises a first neutralization process for neutralizing the chlorinated polyvinyl chloride resin to pH of 2 to 5 using metal hydroxide as a first neutralizing agent a), and a second neutralization process for completing neutralization of the chlorinated polyvinyl chloride resin which is neutralized to pH of 2 to 5, using a carbonate-based compound as a second neutralizing agent b).
Dependencies are inferred from the claim text.