Method of preparing diene-based rubber polymer and method of preparing graft polymer including the diene-based rubber polymer

Patent metadata

Field	Value
Publication number	US-12103998-B2
Application number	US-202017436027-A
Country	US
Kind code	B2
Filing date	Aug 24, 2020
Priority date	Sep 20, 2019
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

Provided is a method of preparing a diene-based rubber polymer, which includes: adding each of a diene-based monomer, a molecular-weight regulator, an initiator, and an emulsifier to a reactor a first time and carrying out polymerization; adding a molecular-weight regulator to the reactor a second time when a polymerization conversion rate of 48 to 72% is reached and carrying out polymerization; adding a diene-based monomer to the reactor a second time when a polymerization conversion rate of 63 to 77% is reached and carrying out polymerization; adding each of an initiator and an emulsifier to the reactor a second time when a polymerization conversion rate of 68 to 81% is reached and carrying out polymerization; and adding each of an initiator and an emulsifier to the reactor a third time when a polymerization conversion rate of 85 to 91% is reached and carrying out polymerization.

First claim

The invention claimed is:

1. A method of preparing a diene-based rubber polymer, comprising:
adding each of a diene-based monomer, a molecular-weight regulator, an initiator, and an emulsifier to a reactor a first time and carrying out polymerization;
adding a molecular-weight regulator to the reactor a second time when a polymerization conversion rate of 48 to 72% is reached and carrying out polymerization;
adding a diene-based monomer to the reactor a second time when a polymerization conversion rate of 63 to 77% is reached and carrying out polymerization;
adding each of an initiator and an emulsifier to the reactor a second time when a polymerization conversion rate of 68 to 81% is reached and carrying out polymerization; and
adding each of an initiator and an emulsifier to the reactor a third time when a polymerization conversion rate of 85 to 91% was reached and carrying out polymerization.

2. The method of claim 1 , wherein the molecular-weight regulator is added to the reactor the second time when a polymerization conversion rate of 50 to 70% is reached, and polymerization is performed.

3. The method of claim 1 , wherein the diene-based monomer is added to the reactor the second time when a polymerization conversion rate of 65 to 75% is reached, and polymerization is performed.

4. The method of claim 1 , wherein each of the initiator and the emulsifier is added to the reactor the second time when a polymerization conversion rate of 70 to 80% is reached, and polymerization is performed.

5. The method of claim 1 , wherein each of the initiator and the emulsifier is added to the reactor the third time when a polymerization conversion rate of 85 to 90% is reached, and polymerization is performed.

6. The method of claim 1 , wherein a weight ratio of the diene-based monomer added the first time and the diene-based monomer added the second time is in a range of 70:30 to 90:10.

7. The method of claim 1 , wherein a weight ratio of the molecular-weight regulator added the first time and the molecular-weight regulator added the second time is in a range of 60:40 to 75:25.

8. The method of claim 1 , wherein, based on a total weight of the initiator added the first time, second time, and third time:
a weight of the initiator added the first time is in a range of 60 to 80%;
a weight of the initiator added the second time is in a range of 7 to 25%; and
a weight of the initiator added the third time is in a range of 5 to 20%.

9. The method of claim 1 , wherein, based on a total weight of the emulsifier added the first time, second time, and third time:
a weight of the emulsifier added the first time is in a range of 65 to 85%;
a weight of the emulsifier added the second time is in a range of 10 to 30%; and
a weight of the emulsifier added the third time is in a range of 3 to 15%.

10. A method of preparing a graft polymer, comprising:
preparing a diene-based rubber polymer by the method of claim 1 ; and
graft-polymerizing an aromatic vinyl-based monomer and a vinyl cyanide-based monomer to the diene-based rubber polymer and thus preparing a graft polymer.

Assignees

• Lg Chemical Ltd

Inventors

• Bak Chang Hong
• Suk Jae Min
• Lee Jin Hyoung
• Heo Jae Won
• Kim Young Min

Classifications

• C08F36/00

  Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds (C08F32/00 takes precedence) · CPC title

• C08F36/06

  Butadiene · CPC title

• C08F2500/21

  Rubbery or elastomeric properties · CPC title

• C08F2/001

  Multistage polymerisation processes characterised by a change in reactor conditions without deactivating the intermediate polymer (C08F295/00, C08F297/00 take precedence) · CPC title

• C08F2/38

  Polymerisation using regulators, e.g. chain terminating agents {, e.g. telomerisation} · CPC title