Gel composition, cable filler, cable, and crumb for gel composition

Patent metadata

Field	Value
Publication number	US-11753545-B2
Application number	US-201816618277-A
Country	US
Kind code	B2
Filing date	May 31, 2018
Priority date	May 31, 2017
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

A gel composition is a gel composition containing a base oil (a) and a hydrogenated block copolymer (b), wherein the hydrogenated block copolymer (b) is a hydrogenated product of a diblock copolymer composed of a polymer block (A) consisting mainly of a structural unit derived from an aromatic vinyl compound and a polymer block (B) consisting mainly of a structural unit derived from a conjugated diene compound, the content of the polymer block (A) in the hydrogenated block copolymer (b) being 38.0 to 45.0% by mass; and the content of the hydrogenated block copolymer (b) in the gel composition is 1 to 20 parts by mass based on 100 parts by mass of the total amount of the base oil (a) and the hydrogenated block copolymer (b).

First claim

The invention claimed is:

1. A gel composition, comprising:
a base oil and
a hydrogenated block copolymer,
wherein the hydrogenated block copolymer is a hydrogenated product of a diblock copolymer composed of a first polymer block consisting of a structural unit derived from an aromatic vinyl compound in an amount of 50% by mass or more based on the total mass of the first polymer block, and a second polymer block consisting of a structural unit derived from isoprene in an amount of 50% by mass or more based on the total mass of the second polymer block,
the content of the first polymer block in the hydrogenated block copolymer being from 38.0 to 45.0% by mass,
the content of a vinyl bond structural unit in the second polymer block is from 2 to 10 mol %, and
the content of the hydrogenated block copolymer in the gel composition is from 1 to 20 parts by mass based on 100 parts by mass of the total amount of the base oil and the hydrogenated block copolymer.

2. The gel composition according to claim 1 , wherein a peak top molecular weight of the hydrogenated block copolymer is from 50,000 to 250,000.

3. The gel composition according to claim 1 , wherein a hydrogenation rate of the second polymer block in the hydrogenated block copolymer is from 90 to 99.5 mol %.

4. The gel composition according to claim 1 , wherein a viscosity index of the base oil is from 70 to 150.

5. The gel composition according to claim 1 , wherein the base oil is at least one selected from paraffin-based mineral oils and naphthene-based mineral oils.

6. The gel composition according to claim 1 , wherein the base oil comprises a paraffin and a naphthene, and a mass ratio of the paraffin to the naphthene [paraffin/naphthene] is from 60/40 to 90/10.

7. The gel composition according to claim 1 , further comprising an antioxidant in an amount of 0.01 to 1 part by mass based on 100 parts by mass of the total amount of the base oil and the hydrogenated block copolymer.

8. The gel composition according to claim 1 , wherein a viscosity of the gel composition under a shear rate condition of 50 s −1 is 500 to 100,000 mPa·s.

9. The gel composition according to claim 1 , wherein a ratio of a viscosity under a shear rate condition of 1 s −1 to a viscosity under a shear rate condition of 50 s −1 is 5 or more.

10. The gel composition according to claim 1 , wherein a separation oil degree of the gel composition is 1% or less.

11. A cable filling material, which is composed of the gel composition according to claim 1 .

12. A cable, comprising the gel composition according to claim 1 .

13. The cable according to claim 12 , which is an optical fiber cable.

14. A crumb for gel composition, comprising a hydrogenated block copolymer,
wherein the hydrogenated block copolymer is a hydrogenated product of a diblock copolymer composed of a first polymer block consisting of a structural unit derived from an aromatic vinyl compound in an amount of 50% by mass or more based on the total mass of the first polymer block, and a second polymer block consisting of a structural unit derived from isoprene in an amount of 50% by mass or more based on the total mass of the second polymer block, the content of the first polymer block in the hydrogenated block copolymer being from 38.0 to 45.0% by mass, and the content of a vinyl bond structural unit in the second polymer block is from 2 to 10 mol %.

15. The gel composition according to claim 1 , wherein the hydrogenated block copolymer is the only hydrogenated block copolymer in the composition.

16. The crumb according to claim 14 , wherein the hydrogenated block copolymer is the only hydrogenated block copolymer in the composition.

Assignees

• Kuraray Co

Inventors

• Morishita Yoshihiro
• Tomishima Yuta
• Oshita Shinya
• Minamide Asako

Classifications

• C08L91/00 Primary

  Compositions of oils, fats or waxes; Compositions of derivatives thereof · CPC title

• C08L53/025 Primary

  modified · CPC title

• G02B6/44384

  the means comprising water blocking or hydrophobic materials (G02B6/4439, G02B6/4479 take precedence) · CPC title

• C08L53/02 Primary

  of vinyl-aromatic monomers and conjugated dienes · CPC title

• C08J3/092

  Hydrocarbons · CPC title