Conjugated-diene based copolymer composition, method for preparing the copolymer composition and rubber composition comprising the copolymer composition

Patent metadata

Field	Value
Publication number	US-11180642-B2
Application number	US-201816478709-A
Country	US
Kind code	B2
Filing date	Nov 13, 2018
Priority date	Dec 19, 2017
Publication date	Nov 23, 2021
Grant date	Nov 23, 2021

Abstract

A conjugated diene-based copolymer composition is provided. The conjugated diene-based copolymer composition includes a first conjugated diene-based copolymer having 20 wt % to 60 wt % of an aromatic vinyl monomer-derived repeating unit, 35 wt % to 75 wt % of a first conjugated diene-based monomer-derived repeating unit, and 1 wt % to 10 wt % of a hydroxyalkyl (meth)acrylate monomer-derived repeating unit. The first conjugated diene-based copolymer has a Mooney viscosity (MV) at 100° C. of 30 to 120. The conjugated diene-based copolymer composition also includes a second conjugated diene-based copolymer having 20 wt % to 60 wt % of an α-methylstyrene monomer-derived repeating unit and 40 wt % to 80 wt % of a second conjugated diene-based monomer-derived repeating unit. The second conjugated copolymer has a Mooney viscosity (MV) at 100° C. of more than 120 and equal to or less than 200. A method for preparing the conjugated diene-based copolymer is also provided.

First claim

The invention claimed is:

1. A conjugated diene-based copolymer composition, comprising:
a first conjugated diene-based copolymer including 20 wt % to 60 wt % of an aromatic vinyl monomer-derived repeating unit,
35 wt % to 75 wt % of a first conjugated diene-based monomer-derived repeating unit, and
1 wt % to 10 wt % of a hydroxyalkyl (meth)acrylate monomer-derived repeating unit,
wherein the first conjugated diene-based copolymer has a Mooney viscosity (MV) at 100° C. of 30 to 120; and
a second conjugated diene-based copolymer including 20 wt % to 60 wt % of an α-methylstyrene monomer-derived repeating unit and
40 wt % to 80 wt % of a second conjugated diene-based monomer-derived repeating unit, and
wherein the second conjugated diene-based copolymer has a Mooney viscosity (MV) at 100° C. of more than 120 and equal to or less than 200.

2. The conjugated diene-based copolymer composition of claim 1 , wherein the aromatic vinyl monomer includes styrene, 3-methylstyrene, 4-methylstyrene, 4-propylstyrene, 1-vinylnaphthalene, 4-cyclohexylstyrene, 4-(p-methylphenyl)styrene, or 1-vinyl-5-hexylnaphthalene.

3. The conjugated diene-based copolymer composition of claim 1 , wherein the hydroxyalkyl (meth)acrylate monomer includes hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, or hydroxybutyl (meth)acrylate.

4. The conjugated diene-based copolymer composition of claim 1 , wherein the Mooney viscosity (MV) at 100° C. of the first conjugated diene-based copolymer is 60 to 90.

5. The conjugated diene-based copolymer composition of claim 1 , wherein the Mooney viscosity (MV) at 100° C. of the second conjugated diene-based copolymer is 160 to 180.

6. The conjugated diene-based copolymer composition of claim 1 , wherein a content of the first conjugated diene-based copolymer is 10 wt % to 90 wt %, and a content of the second conjugated diene-based copolymer is 10 wt % to 90 wt %, based on a total content of the conjugated diene-based copolymer composition.

7. A method of preparing a conjugated diene-based copolymer composition, comprising:
polymerizing a first monomer mixture including
20 wt % to 60 wt % of an aromatic vinyl monomer, 35 wt % to 75 wt % of a first conjugated diene-based monomer, and
1 wt % to 10 wt % of a hydroxyalkyl (meth)acrylate monomer in an emulsion to prepare a first conjugated diene-based copolymer having a Mooney viscosity (MV) at 100° C. of 30 to 120 (S 10 );
polymerizing a second monomer mixture including
20 wt % to 60 wt % of an α-methylstyrene monomer and
40 wt % to 80 wt % of a second conjugated diene-based monomer in an emulsion to prepare a second conjugated diene-based copolymer having a Mooney viscosity (MV) at 100° C. of more than 120 and equal to or less than 200 (S 20 ); and
mixing the first conjugated diene-based copolymer prepared in (S 10 ) and the second conjugated diene-based copolymer prepared in (S 20 ) (S 30 ).

8. A rubber composition comprising rubber raw materials including the conjugated diene-based copolymer composition of claim 1 .

9. The rubber composition of claim 8 , wherein the rubber composition includes 1 part by weight to 200 parts by weight of a silica-based filler, based on 100 parts by weight of the rubber raw materials.

10. The rubber composition of claim 9 , wherein the silica-based filler includes wet silica, dry silica, calcium silicate, aluminum silicate, or colloidal silica.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Se Eun
• Kim Byoung Yun
• Yoon Hyung Woon
• Lee Jae Min
• Choi Woo Seok

Classifications

• C08L47/00 Primary

  Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Compositions of derivatives of such polymers (C08L45/00 takes precedence; of conjugated diene rubbers C08L9/00 - C08L21/00) · CPC title

• C08L21/00

  Compositions of unspecified rubbers · CPC title

• C08L9/06 Primary

  Copolymers with styrene · CPC title

• C08L2201/52

  Aqueous emulsion or latex, e.g. containing polymers of a glass transition temperature (Tg) below 20°C · CPC title

• C08L25/10

  with conjugated dienes · CPC title