Polymer and asphalt composition

• US 10,640,639 B2
• Filed: 01/16/2015
• Issued: 05/05/2020
• Est. Priority Date: 01/17/2014
• Status: Active Grant

• Current Assignee: Asahi Kasei Kabushiki Kaisha
• Original Assignee: Asahi Kasei Kabushiki Kaisha
• Inventors: Shiromoto, Takayuki, Nakajima, Shigeo, Araki, Yoshifumi, Suzuki, Takuya
• Primary Examiner(s): Mullis, Jeffrey C
• Application Number:
  US15/111,892
• Publication Number:
  US 20190153214A1
• Time in Patent Office: 1,936 Days
• CPC Class Codes: C08F 297/04 polymerising vinyl aromatic monomers and conjugated dienes
• CPC Class Codes: C08L 2555/22 Asphalt produced above 140°C, e.g. hot melt asphalt
• CPC Class Codes: C08L 2555/54 Sulfur or carbon black
• CPC Class Codes: C08L 2555/80 Macromolecular constituents
• CPC Class Codes: C08L 2555/84 Polymers comprising styrene, e.g. , polystyrene, styrene-diene copolymers or styrene-butadiene-styrene copolymers
• CPC Class Codes: C08L 53/02 of vinyl-aromatic monomers and conjugated dienes
• CPC Class Codes: C08L 53/025 modified
• CPC Class Codes: C08L 95/00 Compositions of bituminous materials, e.g. asphalt, tar, pitch
• CPC Class Codes: E01C 7/265 with rubber or synthetic resin, e.g. with rubber aggregate, with synthetic resin binder for thin overlays or surface dressings E01C7/35

Abstract

The present invention provides a polymer comprising conjugated diene monomer units and vinyl aromatic monomer units, wherein

• • the polymer has a polymer block (A) comprising principally vinyl aromatic monomer units, and a polymer block (B) comprising conjugated diene monomer units and vinyl aromatic monomer units, and
  • has a Bragg spacing of 27 nm or larger and 50 nm or smaller.

Claims

1. A polymer comprising a conjugated diene monomer unit and a vinyl aromatic monomer unit, wherein

the polymer has a polymer block (A) comprising principally a vinyl aromatic monomer unit, and a polymer block (B) comprising a conjugated diene monomer unit and a vinyl aromatic monomer unit,

the polymer has a Bragg spacing of 27 nm or larger and 50 nm or smaller,

the polymer has a peak top of loss tangent (tan δ

) in the range of −

55 to −

10°

C. in a dynamic viscoelastic spectrum,

the polymer has a functional group, and

a value of the peak top is 0.7 or higher and 1.5 or lower.

2. The polymer according to claim 1, wherein a rate of hydrogenation of a double bond in the conjugated diene monomer unit is 0 mol % or higher and 90 mol % or lower.

3. The polymer according to claim 1, wherein the rate of hydrogenation of the double bond in the conjugated diene monomer unit is 50 mol % or higher and 90 mol % or lower.

4. The polymer according to claim 1, wherein the rate of hydrogenation of the double bond in the conjugated diene monomer unit exceeds 90 mol %.

5. The polymer according to claim 1, wherein

the value of the peak top is 0.8 or higher and 1.3 or lower.

6. The polymer according to claim 5, wherein

the value of the peak top is 0.9 or higher and 1.2 or lower.

7. The polymer according to claim 1, wherein a content of the vinyl aromatic monomer unit is 20% by mass or larger and 60% by mass or smaller.

8. The polymer according to claim 1, wherein the content of the polymer block (A) is 10% by mass or larger and 40% by mass or smaller.

9. The polymer according to claim 1, wherein the content of a short-chain vinyl aromatic monomer-polymerized moiety comprising 2 to 6 vinyl aromatic monomer units in the polymer block (B) is 50% by mass or larger based on the content of the vinyl aromatic monomer unit in the polymer block (B) defined as 100% by mass.

10. The polymer according to claim 9, wherein a content of a short-chain vinyl aromatic monomer-polymerized moiety in the polymer block (B) is 70% by mass or larger based on the content of the vinyl aromatic monomer unit in the polymer block (B) defined as 100% by mass.

11. The polymer according to claim 1, wherein

the conjugated diene monomer unit consist of a conjugated diene monomer unit (a) derived from 1,2-bond and/or 3,4-bond and a conjugated diene monomer unit (b) derived from 1,4-bond, and

when a total content of the conjugated diene monomer unit is defined as 100% by mass,

a content of an alkenyl monomer unit (a1) of a hydrogenated part of the conjugated diene monomer unit (a) is 10% by mass or larger and 50% by mass or smaller,

a content of an alkenyl monomer unit (b1) of a hydrogenated part of the conjugated diene monomer unit (b) is 0% by mass or larger and 80% by mass or smaller, and

the sum of the contents of an unhydrogenated conjugated diene monomer unit (a) and an unhydrogenated conjugated diene monomer unit (b) after hydrogenation is 0% by mass or larger and 90% by mass or smaller.

12. The polymer according to claim 1, wherein the polymer has a weight-average molecular weight of 50000 or higher and 400000 or lower.

13. The polymer according to claim 1, wherein the content of the conjugated diene monomer unit (a) derived from 1,2-bond and/or 3,4-bond is 10 mol % or higher and 50 mol % or lower based on the total content of the conjugated diene monomer unit.

14. An asphalt composition comprising 0.5 parts by mass or more and 50 parts by mass or less of the polymer according to claim 1 and 100 parts by mass of asphalt.

15. An asphalt composition comprising

0.5 parts by mass or more and 50 parts by mass or less in total of the polymer according to claim 1 and a block copolymer (α

), and

100 parts by mass of asphalt, wherein

the block copolymer (α

) has at least one polymer block (A) comprising principally a vinyl aromatic monomer unit, and at least one polymer block (C) comprising principally a conjugated diene monomer unit, and

a content of the block copolymer (α

) is 15 to 85% by mass in the total amount of the polymer and the block copolymer (α

).

16. The asphalt composition according to claim 14, further comprising 0.03 parts by mass or more and 3 parts by mass or less of sulfur and/or a sulfur compound based on 100 parts by mass of the asphalt.

17. The asphalt composition according to claim 15, further comprising 0.03 parts by mass or more and 3 parts by mass or less of sulfur and/or a sulfur compound based on 100 parts by mass of the asphalt.

18. An asphalt composition comprising 0.5 parts by mass or more and 50 parts by mass or less of the polymer according to claim 1 and 100 parts by mass of asphalt.

19. An asphalt composition comprising

0.5 parts by mass or more and 50 parts by mass or less in total of the polymer according to claim 1 and a block copolymer (α

), and

100 parts by mass of asphalt, wherein

the block copolymer (α

) has at least one polymer block (A) comprising principally a vinyl aromatic monomer unit, and at least one polymer block (C) comprising principally a conjugated diene monomer unit, and

a content of the block copolymer (α

) is 15 to 85% by mass in the total amount of the polymer and the block copolymer (α

).