Asphalt composition

Patent metadata

Field	Value
Publication number	US-10351475-B2
Application number	US-201515314564-A
Country	US
Kind code	B2
Filing date	May 27, 2015
Priority date	May 29, 2014
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

The asphalt composition of the present invention is an asphalt composition comprising 1% to 15% by mass of a block copolymer (a) and an asphalt (c), wherein the block copolymer (a) comprises a specific block copolymer (a-1) and a specific block copolymer (a-2) in specific amounts, wherein the content of a vinyl aromatic monomer unit in the block copolymer (a) is 34% by mass or more and 55% by mass or less, the number average molecular weight of the block copolymer (a-1) is in the range of 20,000 to 73,000, and the number average molecular weight of the block copolymer (a-2) is 1.5 to 5.0 times higher than the number average molecular weight of the block copolymer (a-1).

First claim

The invention claimed is:

1. An asphalt composition comprising
(i) 1% to 15% by mass of a block copolymer (a) and an asphalt (c), wherein
the block copolymer (a) comprises a block copolymer (a-1) and a block copolymer (a-2), wherein
the block copolymer (a-1) has a polymer block comprising a vinyl aromatic monomer unit, and a polymer block comprising a conjugated diene monomer unit,
the block copolymer (a-2) has a polymer block comprising a vinyl aromatic monomer unit, and a polymer block comprising a conjugated diene monomer unit,
a content of the block copolymer (a-1) in the total mass of the block copolymer (a) is 40% by mass or more and 85% by mass or less,
a content of the block copolymer (a-2) in the total mass of the block copolymer (a) is 15% by mass or more and 60% by mass or less,
a content of the vinyl aromatic monomer unit in the block copolymer (a) is 34% by mass or more and 55% by mass or less,
a number average molecular weight of the block copolymer (a-1) is in the range of 20,000 to 73,000, and
a number average molecular weight of the block copolymer (a-2) is 1.5 to 5.0 times higher than the number average molecular weight of the block copolymer (a-1), and
(ii) 0.5% to 10% by mass of a block copolymer (b), wherein
the block copolymer (b) has a polymer block comprising a vinyl aromatic monomer unit, and a polymer block comprising a conjugated diene monomer unit, and
a content of the vinyl aromatic monomer unit in the block copolymer (b) is 24% by mass or more and less than 34% by mass.

2. The asphalt composition according to claim 1 , wherein
the block copolymer (a-1) has one polymer block comprising a vinyl aromatic monomer unit, and one polymer block comprising a conjugated diene monomer unit, and
the block copolymer (a-2) has two or more polymer blocks each comprising a vinyl aromatic monomer unit, and one or more polymer blocks each comprising a conjugated diene monomer unit.

3. The asphalt composition according to claim 1 , wherein
the block copolymer (a-2) comprises at least one block copolymer selected from the group consisting of (S-B)n+1, B-(S-B)n+1, S-(B-S)n, S-(B-S)n-X, [(S-B)k]m-X, and [(S-B)k-S]m-X (wherein, in each formula, m represents an integer of 2 to 6; n and k each independently represent an integer of 1 to 4; S represents a polymer block comprising a vinyl aromatic monomer unit; B represents a polymer block comprising a conjugated diene monomer unit; and X represents a residue of a coupling agent or a residue of a polymerization initiator).

4. The asphalt composition according to claim 1 , wherein the block copolymer (a-2) comprises at least a block copolymer represented by (S-B)3-X (wherein S represents a polymer block comprising a vinyl aromatic monomer unit; B represents a polymer block comprising a conjugated diene monomer unit; and X represents a residue of a coupling agent).

5. The asphalt composition according to claim 1 , wherein the content of the block copolymer (a-1) in the block copolymer (a) is 55% by mass or more and 85% by mass or less.

6. The asphalt composition according to claim 1 , wherein a ratio of the content of a vinyl aromatic monomer block to the total content of the vinyl aromatic monomer unit in the block copolymer (a) is in the range of 90.0% to 99.0% by mass.

7. The asphalt composition according to claim 1 , wherein
the block copolymer (b) comprises a block copolymer (b-1) and a block copolymer (b-2), wherein
the block copolymer (b-1) has a polymer block comprising a vinyl aromatic monomer unit, and a polymer block comprising a conjugated diene monomer unit, and
the block copolymer (b-2) has a polymer block comprising a vinyl aromatic monomer unit, and a polymer block comprising a conjugated diene monomer unit,
a content of the block copolymer (b-1) in the total mass of the block copolymer (b) is 5% by mass or more and 40% by mass or less,
a content of the block copolymer (b-2) in the total mass of the block copolymer (b) is 60% by mass or more and 95% by mass or less,
a number average molecular weight of the block copolymer (b-1) is in the range of 60,000 to 150,000, and
a number average molecular weight of the block copolymer (b-2) is 1.5 to 5.0 times higher than the number average molecular weight of the block copolymer (b-1).

8. The asphalt composition according to claim 7 , wherein
the block copolymer (b-1) has one polymer block comprising a vinyl aromatic monomer unit, and one polymer block comprising a conjugated diene monomer unit, and
the block copolymer (b-2) has two or more polymer blocks each comprising a vinyl aromatic monomer unit, and one or more polymer blocks each comprising a conjugated diene monomer unit.

9. The asphalt composition according to claim 1 , wherein
the block copolymer (a) and/or the block copolymer (b) are block copolymers, in which double bonds in the conjugated diene monomer unit are hydrogenated.

10. The asphalt composition according to claim 1 , wherein
the block copolymer (a-1) has a polymer block comprising 60% by mass or more of a vinyl aromatic monomer unit, and a polymer block comprising 60% by mass or more of a conjugated diene monomer unit, and
the block copolymer (a-2) has a polymer block comprising 60% by mass or more of a vinyl aromatic monomer unit, and a polymer block comprising 60% by mass or more of a conjugated diene monomer unit.

11. The asphalt composition according to claim 1 , wherein
the block copolymer (a-1) has a polymer block comprising 90% by mass or more of a vinyl aromatic monomer unit, and a polymer block comprising 90% by mass or more of a conjugated diene monomer unit, and
the block copolymer (a-2) has a polymer block comprising 90% by mass or more of a vinyl aromatic monomer unit, and a polymer block comprising 90% by mass or more of a conjugated diene monomer unit.

12. A road comprising the asphalt composition according to claim 1 and an aggregate.

13. A road comprising the asphalt composition according to claim 2 and an aggregate.

14. A road comprising the asphalt composition according to claim 3 and an aggregate.

15. A road comprising the asphalt composition according to claim 4 and an aggregate.

16. A road comprising the asphalt composition according to claim 5 and an aggregate.

17. A road comprising the asphalt composition according to claim 6 and an aggregate.

18. A road comprising the asphalt composition according to claim 7 and an aggregate.

19. A road comprising the asphalt composition according to claim 8 and an aggregate.

20. A road comprising the asphalt composition according to claim 9 and an aggregate.

Assignees

• Asahi Chemical Ind

Inventors

• Araki Yoshifumi

Classifications

• C04B2103/0061

  Block (co-)polymers · CPC title

• C04B2111/0075

  for road construction · CPC title

• C04B26/26

  Bituminous materials, e.g. tar, pitch {(C08L95/00 takes precedence)} · CPC title

• C08L2555/20

  Mixtures of bitumen and aggregate defined by their production temperatures, e.g. production of asphalt for road or pavement applications · CPC title

• C08L95/00 Primary

  Compositions of bituminous materials, e.g. asphalt, tar, pitch · CPC title