Asphalt Composition

Patent metadata

Field	Value
Publication number	US-2017197879-A1
Application number	US-201515314564-A
Country	US
Kind code	A1
Filing date	May 27, 2015
Priority date	May 29, 2014
Publication date	Jul 13, 2017
Grant date	—

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

1 . 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 block copolymer (a-1) and a block copolymer (a-2), wherein the block copolymer (a-1) has a polymer block comprising, as a main component, a vinyl aromatic monomer unit, and a polymer block comprising, as a main component, a conjugated diene monomer unit, and the block copolymer (a-2) has a polymer block comprising, as a main component, a vinyl aromatic monomer unit, and a polymer block comprising, as a main component, 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).

2 . The asphalt composition according to claim 1 , wherein
the block copolymer (a-1) has one polymer block comprising, as a main component, a vinyl aromatic monomer unit, and one polymer block comprising, as a main component, a conjugated diene monomer unit, and the block copolymer (a-2) has two or more polymer blocks each comprising, as a main component, a vinyl aromatic monomer unit, and one or more polymer blocks each comprising, as a main component, 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, as a main component, a vinyl aromatic monomer unit; B represents a polymer block comprising, as a main component, 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, as a main component, a vinyl aromatic monomer unit; B represents a polymer block comprising, as a main component, 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 , which further comprises 0.5% to 10% by mass of a block copolymer (b), wherein
the block copolymer (b) has a polymer block comprising, as a main component, a vinyl aromatic monomer unit, and a polymer block comprising, as a main component, 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.

8 . The asphalt composition according to claim 7 , 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, as a main component, a vinyl aromatic monomer unit, and a polymer block comprising, as a main component, a conjugated diene monomer unit, and the block copolymer (b-2) has a polymer block comprising, as a main component, a vinyl aromatic monomer unit, and a polymer block comprising, as a main component, 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).

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

10 . 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.

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

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

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

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

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

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

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

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

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

20 . A road comprising the asphalt composition according to claim 10 and an aggregate.

Assignees

• Asahi Chemical Ind

Inventors

• Araki Yoshifumi

Classifications

• E01C7/18

  of road-metal and bituminous binders {(for surface treatments except for penetration coverings, or for thin surface layers E01C7/353; bituminous mixtures C08L95/00)} · CPC title

• C08L53/02

  of vinyl-aromatic monomers and conjugated dienes · CPC title

• C08L95/00 Primary

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

• C04B2111/0075

  for road construction · CPC title

• C04B2103/0061

  Block (co-)polymers · CPC title