Method for preparing liquid rubber and liquid rubber prepared therefrom

Patent metadata

Field	Value
Publication number	US-12415873-B2
Application number	US-202117625576-A
Country	US
Kind code	B2
Filing date	Apr 1, 2021
Priority date	May 22, 2020
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

The present invention relates to a method for preparing a liquid rubber, and relates to a method for preparing a liquid rubber, including performing polymerization reaction of a conjugated diene-based monomer in the presence of an organic solvent and a catalyst composition (S10), wherein the catalyst composition includes a catalyst including a compound represented by the following Formula 1, and a liquid rubber prepared therefrom:

wherein R, R 1 to R 4 , and o, p, q and r are described herein.

First claim

The invention claimed is:

1. A method for preparing a liquid rubber, the method comprising a step S10: performing polymerization reaction of a conjugated diene-based monomer in the presence of an organic solvent and a catalyst composition, wherein
the catalyst composition comprises a catalyst comprising a compound represented by the following Formula 1:

in Formula 1,
R is an alkyl group of 1 to 12 carbon atoms,
R 1 to R 4 are each independently a halogen group, or a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, and
o, p, q and r are each independently an integer of 1 to 5.

2. The method for preparing a liquid rubber according to claim 1 , wherein R 1 to R 4 are each independently a halogen group, or a halogen-substituted alkyl group of 1 to 12 carbon atoms.

3. The method for preparing a liquid rubber according to claim 1 , wherein an organic borate in the compound represented by Formula 1 is one or more selected from the group consisting of tetrakis(phenyl)borate, tetrakis(pentafluorophenyl)borate, tetrakis[3,5-bis(trifluoromethyl)phenyl]borate and derivatives thereof.

4. The method for preparing a liquid rubber according to claim 1 , wherein the catalyst composition is comprised in 0.1 parts by weight or less based on an amount of 100 parts by weight of the organic solvent and the conjugated diene-based monomer.

5. The method for preparing a liquid rubber according to claim 1 , wherein the step S10 of polymerization is performed by comprising an aromatic vinyl-based monomer.

6. The method for preparing a liquid rubber according to claim 1 , where prior to the step S10, further comprising a step S1: performing polymerization reaction of an aromatic vinyl-based monomer in the presence of the organic solvent and the catalyst composition.

7. The method for preparing a liquid rubber according to claim 1 , wherein the catalyst composition further comprises a halogenated hydrocarbon solvent.

8. The method for preparing a liquid rubber according to claim 1 , wherein the conjugated diene-based monomer is one or more selected from the group consisting of 1,3-butadiene, 2,3-dimethyl-1,3-butadiene, piperylene, 3-butyl-1,3-octadiene, isoprene and 2-phenyl-1,3-butadiene.

9. The method for preparing a liquid rubber according to claim 1 , wherein the catalyst composition comprises an aluminum-based cocatalyst.

10. The method for preparing a liquid rubber according to claim 9 , wherein the aluminum-based cocatalyst is one or more selected from aluminum-based compounds represented by the following Formula 2 to Formula 4:

in Formulae 2 to 4,
R a , R 5 and R 6 are each independently a monovalent hydrocarbon group of 1 to 20 carbon atoms,
Z is a halogen group,
m is an integer of 0 to 3, and
a and b are each independently an integer of 1 to 100.

11. The method for preparing a liquid rubber according to claim 9 , wherein a weight ratio of the catalyst comprising the compound represented by Formula 1 and the aluminum-based cocatalyst is 1:0.1 to 1:50.

12. The method for preparing a liquid rubber according to claim 9 , wherein the aluminum-based cocatalyst is one or more selected from the group consisting of methylaluminoxane, modified methylaluminoxane, trimethylaluminum, triethylaluminum, tri-n-propylaluminum, triisopropylaluminum, tri-n-butylaluminum, triisobutylaluminum, tri-t-butylaluminum, tripentylaluminum, trihexylaluminum, tricyclohexylaluminum, trioctylaluminum, tri-2-ethylhexylaluminum, dimethylaluminum chloride, diethylaluminum chloride, diisopropylaluminum chloride, diisobutylaluminum chloride, dimethylaluminum bromide, methylaluminum dichloride, ethylaluminum dichloride, isopropylaluminum dichloride, aluminum chloride and ethylaluminum dibromide.

13. The method for preparing a liquid rubber according to claim 12 , wherein the modified methylaluminoxane is a compound represented by Formula 5 below,

wherein R 7 is a monovalent hydrocarbon group of 1 to 20 carbon atoms, c and d are each independently an integer of 2 or more, and Me represents a methyl group.

Assignees

• Lg Chemical Ltd

Inventors

• Choi Ji Hyun
• Choi Gyeong Shin
• Kim Won Hee
• Baek Jong Yeol
• Kim Hee Jeong

Classifications

• C08F236/10

  with vinyl-aromatic monomers · CPC title

• C08F136/08

  Isoprene · CPC title

• C08F136/06 Primary

  Butadiene · CPC title

• C08L9/10

  Latex (C08L9/04, C08L9/08 take precedence) · CPC title

• C08L9/08

  Latex · CPC title