Partially hydrogenated block copolymer, viscous adhesive composition, viscous adhesive tape, label, modified asphalt composition, modified asphalt mixture, and paving binder composition

Patent metadata

Field	Value
Publication number	US-10414849-B2
Application number	US-201615744357-A
Country	US
Kind code	B2
Filing date	Jul 15, 2016
Priority date	Jul 16, 2015
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

A partially hydrogenated block copolymer of the present invention includes: a polymer block (A) containing a vinyl aromatic monomer unit as a main component: and a polymer block (B) containing a conjugated diene monomer unit, wherein in a differential molecular weight distribution (B) of a degradation product of the partially hydrogenated block copolymer obtained by an ozone degradation method, a distribution of degree of hydrogenation H, which is given by a maximum peak height in a region of a molecular weight of 800 or more and 3,000 or less, is 0.01 to 0.5.

First claim

The invention claimed is:

1. A partially hydrogenated block copolymer comprising: a polymer block (A) comprising a vinyl aromatic monomer unit as a main component; and a polymer block (B) comprising a conjugated diene monomer unit,
wherein in a differential molecular weight distribution (B) of a degradation product of the partially hydrogenated block copolymer obtained by an ozone degradation method, a distribution of degree of hydrogenation H, which is given by a maximum peak height in a region of a molecular weight of 800 or more and 3,000 or less, is 0.01 to 0.5.

2. The partially hydrogenated block copolymer according to claim 1 , wherein in a differential molecular weight distribution (D) obtained by subtracting, from the differential molecular weight distribution (B), a differential molecular weight distribution (C) of a degradation product of the partially hydrogenated block copolymer obtained by an osmic acid degradation method, a distribution of degree of hydrogenation H 2 , which is given by a maximum peak height based on a total area in a region of a molecular weight of 200 or more and 1,000,000 or less, is 0.001 to 0.007.

3. The partially hydrogenated block copolymer according to claim 1 , wherein the partially hydrogenated block copolymer has a degree of hydrogenation of 95 mol % or less based on a total number of moles of the conjugated diene monomer unit.

4. The partially hydrogenated block copolymer according to claim 1 , wherein the partially hydrogenated block copolymer has a degree of hydrogenation of 10 mol % or more based on a total number of moles of the conjugated diene monomer unit.

5. The partially hydrogenated block copolymer according to claim 1 ,
wherein L 2 /L 1 is less than 0.02, wherein
L 1 is a length of a perpendicular L drawn to a baseline from an apex of a peak that is a peak in a differential molecular weight distribution (A) of the partially hydrogenated polymer and that corresponds to a maximum molecular weight component, and
L 2 is a distance on the perpendicular L between the baseline and an intersection where the differential molecular weight distribution (B) intersects the perpendicular L when the differential molecular weight distribution (B) is superimposed on the differential molecular weight distribution (A).

6. The partially hydrogenated block copolymer according to claim 1 , wherein the partially hydrogenated block copolymer has a vinyl aromatic monomer unit content of 10 to 60% by mass.

7. The partially hydrogenated block copolymer according to claim 1 , wherein the partially hydrogenated block copolymer comprises a partially hydrogenated block copolymer (d1) comprising: one polymer block (A1) comprising a vinyl aromatic monomer unit as a main component; and one polymer block (B1) comprising a conjugated diene monomer unit as a main component.

8. The partially hydrogenated block copolymer according to claim 7 , wherein a content of the partially hydrogenated block copolymer (d1) is 20 to 80% by mass based on 100% by mass of the partially hydrogenated block copolymer.

9. The partially hydrogenated block copolymer according to claim 7 , wherein the partially hydrogenated block copolymer comprises a partially hydrogenated block copolymer (r1) having a radial structure.

10. A viscous adhesive composition comprising 100 parts by mass of the partially hydrogenated block copolymer according to claim 1 and 20 to 400 parts by mass of a tackifier resin.

11. A viscous adhesive tape comprising the viscous adhesive composition according to claim 10 .

12. A label comprising the viscous adhesive composition according to claim 10 .

13. The partially hydrogenated block copolymer according to claim 1 , wherein the partially hydrogenated block copolymer comprises a partially hydrogenated block copolymer (d2) comprising: a polymer block (A) comprising a vinyl aromatic monomer unit as a main component; and a copolymer block (B2) comprising a conjugated diene monomer unit and a vinyl aromatic monomer unit.

14. The partially hydrogenated block copolymer according to claim 13 , wherein the partially hydrogenated block copolymer has a weight average molecular weight (Mw) of 100,000 to 500,000.

15. The partially hydrogenated block copolymer according to claim 13 , wherein a peak temperature of a loss tangent (tan δ) obtained by dynamic viscoelasticity measurement of the partially hydrogenated block copolymer is −50° C. or more and −5° C. or less.

16. The partially hydrogenated block copolymer according to claim 13 , wherein a peak temperature of a loss tangent (tan δ) obtained by dynamic viscoelasticity measurement of the partially hydrogenated block copolymer is −50° C. or more and −5° C. or less, and a peak height value thereof is more than 0.7 and 1.6 or less.

17. A modified asphalt composition comprising 1 part by mass or more and 20 parts by mass or less of the partially hydrogenated block copolymer according to claim 1 , based on 100 parts by mass of asphalt.

18. A modified asphalt mixture comprising the modified asphalt composition according to claim 17 and an aggregate.

19. A paving binder composition comprising:
20 to 70% by mass of a tackifier resin;
20 to 70% by mass of oil; and
2 to 15% by mass of the partially hydrogenated block copolymer according to claim 1 .

Assignees

• Asahi Chemical Ind

Inventors

• Kameda Ippei
• Araki Yoshifumi

Classifications

• C09J195/00

  Adhesives based on bituminous materials, e.g. asphalt, tar, pitch · CPC title

• C09J153/025

  modified · CPC title

• C08L95/00

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

• C08F297/044

  using a coupling agent · CPC title

• C08F8/04 Primary

  Reduction, e.g. hydrogenation · CPC title