Method of preparing vinyl chloride-based polymer

Patent metadata

Field	Value
Publication number	US-11760818-B2
Application number	US-201917265118-A
Country	US
Kind code	B2
Filing date	Oct 30, 2019
Priority date	Nov 2, 2018
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

The present disclosure provides a method of preparing a vinyl chloride-based polymer, and the method provides excellent productivity while having reduced amount of a volatile organic compound generated so as to provide the vinyl chloride-based polymer suitable for an eco-friendly material, and improved foaming and viscosity properties of a plastisol including the prepared polymer, by adding a carbonate-based metal salt and a transition metal catalyst together, and controlling input time and amount of the transition metal catalyst.

First claim

The invention claimed is:

1. A method of preparing a vinyl chloride-based polymer, the method comprising:
polymerizing a vinyl chloride-based monomer by adding a carbonate-based metal salt in the presence of one or more emulsifiers and a polymerization initiator,
wherein a transition metal catalyst is added when a polymerization conversion rate is in a range of 5% to 35% in the step of polymerizing the vinyl chloride-based monomer, and
the transition metal catalyst is added in an amount of 0.01 ppm to 7.5 ppm based on the weight of the vinyl chloride-based monomer.

2. The method of claim 1 , wherein the carbonate-based metal salt comprises at least one selected from the group consisting of sodium carbonate (Na 2 CO 3 ), sodium hydrogen carbonate (NaHCO 3 ), magnesium carbonate (MgCO 3 ), calcium carbonate (CaCO 3 ), and potassium carbonate (K 2 CO 3 ).

3. The method of claim 1 , wherein the transition metal catalyst is added when the polymerization conversion rate is in a range of 10% to 30%.

4. The method of claim 1 , wherein the transition metal catalyst is added by a batch addition method.

5. The method of claim 1 , wherein the transition metal catalyst is added in an amount of 0.03 ppm to 6.0 ppm based on the weight of the vinyl chloride-based monomer.

6. The method of claim 1 , wherein the transition metal catalyst comprises at least one selected from copper sulfate and iron sulfate.

7. The method of claim 1 , wherein the carbonate-based metal salt is added in an amount of 100 ppm to 1,500 ppm based on the weight of the vinyl chloride-based monomer.

8. The method of claim 1 , wherein the polymerization is performed by an emulsion polymerization method.

9. The method of claim 1 , wherein an oxidizing agent and a reducing agent are not added in the step of polymerizing the vinyl chloride-based monomer.

Assignees

• Lg Chemical Ltd

Inventors

• Park Jae Hyun
• Lee Hyun Min
• Ha Hyun Kyou
• Kim Kun Ji
• Lee Kwang Jin
• Jeon Yang Jun
• Ju Jin Hyuck

Classifications

• C08F14/06 Primary

  Vinyl chloride · CPC title

• C08F114/06 Primary

  Vinyl chloride · CPC title

• C08J2327/06

  Homopolymers or copolymers of vinyl chloride · CPC title

• C08J9/30

  by mixing gases into liquid compositions or plastisols, e.g. frothing with air · CPC title

• C08F2/26

  anionic · CPC title