Block Copolymer, Asphalt Composition, and Modified Asphalt Mixture

6:

• The block copolymer (P) according to claim 1, wherein
• a mass proportion (BS) of the polymer block (A) calculated by the following expression (I) is 10% by mass or more and 40% by mass or less:
• BS
• =
• (
• mass
• ⁢
• of
• ⁢
• polymer
• ⁢
• block
• ⁢
• (
• A
• )
• /
• mass
• ⁢
• of
• ⁢
• block
• ⁢
• copolymer
• ⁢
• (
• P
• )
• )
• ×
• 100.
• (
• I
• )

7:

• The block copolymer (P) according to claim 1, wherein
• the polymer block (B) is a polymer block (C) comprising a vinyl aromatic monomer unit and a conjugated diene monomer unit, and
• a mass proportion (RS) of the vinyl aromatic monomer unit in the polymer block (C) calculated by the following expression (II) is 3% by mass or more and less than 50% by mass:
• RS
• =
• (
• TS
• -
• BS
• )
• /
• (
• 100
• -
• BS
• )
• ×
• 100
• (
• II
• )
• wherein TS represents a mass proportion of the vinyl aromatic monomer unit in the block copolymer (P), and BS represents a mass proportion of the polymer block (A) in the block copolymer (P).

10:

• The block copolymer (P) according to claim 9, wherein
• the block copolymer (P) comprises a structure in which a polymer chain is attached to a structure represented by either the following general formula (1) or (2):
• wherein R13 is a hydrocarbon group having 1 to 12 carbon atoms and optionally has an unsaturated bond;
• a plurality of R13 are each optionally different or the same;
• R14 is a hydrocarbon group having 1 to 20 carbon atoms that is optionally substituted with an organic group including Si, O, or N and having no active hydrogen, and optionally has an unsaturated bond;
• d is an integer of 2 to 3, and e is an integer of 0 to 1;
• d+e=3;
• R15 is an aliphatic hydrocarbon group having 1 to 6 carbon atoms and optionally has an unsaturated bond;
• a plurality of R15 are each optionally different or the same;
• and
• R16 is a hydrocarbon group having 1 to 20 carbon atoms that is optionally substituted with an organic group including Si, O, or N and having no active hydrogen, and optionally has an unsaturated bond;
• wherein R4 is an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 20 carbon atoms;
• a plurality of R4 are each optionally different or the same;
• R5 represents an alkylene group having 1 to 10 carbon atoms, and R6 represents an alkylene group having 1 to 20 carbon atoms;
• and
• q represents an integer of 1 or 2, r represents an integer of 2 or 3, and the sum of q and r is an integer of 4 or more.

14:

• The block copolymer (P) according to claim 1, wherein
• a nitrogen content is 20 ppm or more and 1000 ppm or less,
• a silicon content is 50 ppm or more and 300 ppm or less,
• a mass proportion (TS) of the vinyl aromatic monomer unit is 30% by mass or more and 60% by mass or less,
• a hydrogenation rate of a double bond in the conjugated diene monomer unit is 10 mol % or more and 80 mol % or less,
• the polymer block (B) is a polymer block (C) comprising a vinyl aromatic monomer unit and a conjugated diene monomer unit, and
• a mass proportion (RS) of the vinyl aromatic monomer unit in the polymer block (C) calculated by the following expression (II):
• RS
• =
• (
• TS
• -
• BS
• )
• /
• (
• 100
• -
• BS
• )
• ×
• 100
• (
• II
• )
• is 15% by mass or more and 45% by mass or less.

15:

• The block copolymer (P) according to claim 1, wherein
• a nitrogen content is 20 ppm or more and 1000 ppm or less,
• a mass proportion (TS) of the vinyl aromatic monomer unit is 30% by mass or more and 60% by mass or less,
• a hydrogenation rate of a double bond in the conjugated diene monomer unit is 10 mol % or more and 40 mol % or less,
• the polymer block (B) is a polymer block (C) comprising a vinyl aromatic monomer unit and a conjugated diene monomer unit, and
• a mass proportion (RS) of the vinyl aromatic monomer unit in the polymer block (C) calculated by the following expression (II):
• RS
• =
• (
• TS
• -
• BS
• )
• /
• (
• 100
• -
• BS
• )
• ×
• 100
• (
• II
• )
• is 15% by mass or more and 45% by mass or less.

16:

• An asphalt composition comprising:
• 100 parts by mass of an asphalt;
• and
• 0.5 parts by mass or more and 30 parts by mass or less of the block copolymer (P) according to claim 1.

17:

• An asphalt composition comprising:
• 100 parts by mass of an asphalt;
• and
• 0.5 parts by mass or more and 30 parts by mass or less of the block copolymer (P) according to claim 1, wherein
• in composition analysis of the asphalt according to a TLC-FID JPI method (JPI-5S-70), based on 100% by mass in total of a saturate, an aromatic, a resin, and an asphaltene, a total amount of the resin and the asphaltene is 30% by mass or more.

20:

• A modified asphalt mixture comprising:
• 3 parts by mass or more and 15 parts by mass or less of the asphalt composition according to claim 16;
• and
• 100 parts by mass of an aggregate.