Tube using hydrogenated block copolymer

Patent metadata

Field	Value
Publication number	US-10544251-B2
Application number	US-201615758370-A
Country	US
Kind code	B2
Filing date	Sep 7, 2016
Priority date	Sep 9, 2015
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

A tube including a hydrogenated block copolymer (a), wherein the hydrogenated block copolymer (a) includes, in a molecule, a polymer block mainly including a conjugated diene compound (C), a polymer block mainly including a conjugated diene compound (B), and a polymer block mainly including a vinyl aromatic compound (S).

First claim

The invention claimed is:

1. A tube comprising a hydrogenated block copolymer (a), wherein
the hydrogenated block copolymer (a) comprises, in a molecule, a polymer block mainly comprising a conjugated diene compound (C), a polymer block mainly comprising a conjugated diene compound (B), and a polymer block mainly comprising a vinyl aromatic compound (S),
a content of the polymer block mainly comprising the conjugated diene compound (C) is 1 to 30% by mass, a content of the polymer block mainly comprising the conjugated diene compound (B) is 69 to 98% by mass, and a content of the polymer block mainly comprising the vinyl aromatic compound (S) is 1 to 20% by mass in the hydrogenated block copolymer (a),
the polymer block mainly comprising a conjugated diene compound (C) has a vinyl bond content before hydrogenation of 1 to 25 mol %, the polymer block mainly comprising the conjugated diene compound (B) has a vinyl bond content before hydrogenation of 60 to 100 mol %, and the hydrogenated block copolymer (a) has a ratio of hydrogenation of 80 mol % or more, and
a content of the polymer block (C) is 3 to 15% by mass, a content of the polymer block (B) is 72 to 94% by mass, and a content of the polymer block (S) is 3 to 13% by mass in the hydrogenated block copolymer (a), and the hydrogenated block copolymer (a) has a ratio of hydrogenation of 90 mol % or more.

2. The tube according to claim 1 , wherein
a tan δ peak obtained by dynamic viscoelasticity measurement (1 Hz) of the hydrogenated block copolymer (a) is in a range of more than −45° C. and 10° C. or less,
a value of the tan δ peak is 1.0 or more, and
a half width of the tan δ peak is 20° C. or less.

3. The tube according to claim 1 , comprising the hydrogenated block copolymer (a) and a polypropylene resin.

4. The tube according to claim 1 , wherein an intensity ratio of a diffraction peak intensity at a scattering angle (2θ) of 15° (I(15)) to a diffraction peak intensity at a scattering angle (2θ) of 14° (I(14)), (I(14)/I(15)), in wide angle X-ray diffraction measurement is 0.1 or more and less than 1.4.

5. The tube according to claim 1 , wherein
the hydrogenated block copolymer (a) has a weight average molecular weight (Mw) of 100,000 to 300,000, and
a ratio of a weight average molecular weight (Mw) to a number average molecule weight (Mn) of the hydrogenated block copolymer (a), (Mw)/(Mn), is 1.01 to 1.30.

6. The tube according to claim 1 , wherein an integrated amount of elution at −20° C. or less measured by cross-fractionation chromatography (CFC) is 0.1% or more and less than 40% based on a total volume, an integrated amount of elution in a range of more than −20° C. and less than 60° C. is 40% or more and less than 95% based on a total volume, and an integrated amount of elution in a range of 60° C. or more and 150° C. or less is 5% or more and less than 60% based on a total volume.

7. The tube according to claim 1 , wherein a molecular weight distribution (Mw/Mn) of an eluted component in a range of 10° C. or more and less than 60° C. measured by cross-fractionation chromatography (CFC) is 1.05 or more and 1.50 or less.

8. The tube according to claim 1 , comprising at least an outer layer and an inner layer, wherein
the outer layer comprises the polypropylene resin, and
the inner layer comprises the hydrogenated block copolymer (a).

9. The tube according to claim 8 , wherein
the outer layer has a thickness of 5 to 1,000 μm, and
the inner layer has a thickness of 10 to 3,000 μm.

10. The tube according to claim 8 , wherein
the outer layer comprises the hydrogenated block copolymer (a) and/or hydrogenated block copolymer (b1) (provided that the hydrogenated block copolymer (b1) comprises no polymer block mainly comprising a conjugated diene compound having a vinyl bond content before hydrogenation of 1 to 25 mol %),
the hydrogenated block copolymer (b1) comprises a polymer block mainly comprising a conjugated diene compound (B1) and a polymer block mainly comprising a vinyl aromatic compound (S1),
a content of the polymer block mainly comprising the conjugated diene compound (B1) is 75 to 92% by mass and a content of the polymer block mainly comprising the vinyl aromatic compound (S1) is 8 to 25% by mass in the hydrogenated block copolymer (b1),
a vinyl bond content before hydrogenation of the polymer block mainly comprising a conjugated diene compound (B1) is 40 to 100 mol %,
the hydrogenated block copolymer (b1) has a ratio of hydrogenation of 80 mol % or more,
a content of the polypropylene resin in the outer layer is 60 to 100% by mass, and
a content of the hydrogenated block copolymer (a) and/or hydrogenated block copolymer (b1) in the outer layer is 0 to 40% by mass.

11. The tube according to claim 8 , wherein
the inner layer comprises a polypropylene resin, and
a content of the hydrogenated block copolymer (a) in the inner layer is 40 to 95% by mass.

12. The tube according to claim 8 , wherein
the inner layer comprises a hydrogenated block copolymer (b2) (provided that the hydrogenated block copolymer (b2) comprises no polymer block mainly comprising a conjugated diene compound having a vinyl bond content before hydrogenation of 1 to 25 mol %),
the hydrogenated block copolymer (b2) comprises a polymer block mainly comprising a conjugated diene compound (B2) and a polymer block mainly comprising a vinyl aromatic compound (S2),
a content of the polymer block mainly comprising the conjugated diene compound (B2) is 75 to 92% by mass and a content of the polymer block mainly comprising the vinyl aromatic compound (S2) is 8 to 25% by mass in the hydrogenated block copolymer (b2),
a vinyl bond content before hydrogenation of the polymer block mainly comprising the conjugated diene compound (B2) is 60 to 100 mol %,
the hydrogenated block copolymer (b2) has a ratio of hydrogenation of 80 mol % or more,
a content of the polypropylene resin in the inner layer is 5 to 60% by mass, and
a total content of the hydrogenated block copolymer (a) and the hydrogenated block copolymer (b2) in the inner layer is 40 to 95% by mass.

13. The tube according to claim 8 , comprising an intermediate layer between the outer layer and the inner layer, wherein
the intermediate layer comprises the hydrogenated block copolymer (a).

14. A tube comprising a hydrogenated block copolymer (a), wherein
the hydrogenated block copolymer (a) comprises, in a molecule, a polymer block mainly comprising a conjugated diene compound (C), a polymer block mainly comprising a conjugated diene compound (B), and a polymer block mainly comprising a vinyl aromatic compound (S),
a content of the polymer block mainly comprising the conjugated diene compound (C) is 1 to 30% by mass, a content of the polymer block mainly comprising the conjugated diene compound (B) is 69 to 98% by mass, and a content of the polymer block mainly comprising the vinyl aromatic compound (S) is 1 to 20% by mass in the hydrogenated block copolymer (a),
the polymer block mainly comprising a conjugated diene compound (C) has a vinyl bond content before hydrogenation of 1 to 25 mol %, the polymer block mainly comprising the conjugated diene compound (B) has a vinyl bond content before hydrogenation of 60 to 100 mol %, and the hydrogenated block copolymer (a) has a ratio of hydrogenation of 80 mol % or more,
the hydrogenated block copolymer (a) comprises two or more of the polymer blocks mainly comprising a conjugated diene compound (B) in a molecule, and
a content of a polymer block (B-1) present at a terminal of the hydrogenated block copolymer (a) of the polymer blocks mainly comprising the conjugated diene

Assignees

• Asahi Chemical Ind

Inventors

• Kusanose Yasuhiro
• Ichino Hiroyuki
• Yagi Noriko
• Fujiwara Masahiro

Classifications

• C08L53/02

  of vinyl-aromatic monomers and conjugated dienes · CPC title

• C08L23/10

  Homopolymers or copolymers of propene · CPC title

• C08F297/04 Primary

  polymerising vinyl aromatic monomers and conjugated dienes · CPC title

• C08F8/04

  Reduction, e.g. hydrogenation · CPC title

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title