Strand, driving part, method for producing strand, and winding body

Patent metadata

Field	Value
Publication number	US-2025122651-A1
Application number	US-202218685431-A
Country	US
Kind code	A1
Filing date	May 18, 2022
Priority date	Aug 25, 2021
Publication date	Apr 17, 2025
Grant date	—

Abstract

To provide a strand having excellent slidability, a driving part, a method for producing a strand, and a winding Body. A strand including a core material containing a reinforcing fiber impregnated with an elastomer, and a covering layer containing a thermoplastic resin. A driving part including a first member including a strand, and a second member being in contact with the strand of the first member and containing a thermoplastic resin.

First claim

1 . A strand comprising:
a core material containing a reinforcing fiber impregnated with an elastomer; and a covering layer containing a thermoplastic resin.

2 . The strand according to claim 1 , wherein the elastomer is a thermosetting elastomer.

3 . The strand according to claim 2 , wherein an elastic modulus A and an elastic modulus B satisfy (the elastic modulus A/the elastic modulus B)<0.00500,
where the elastic modulus A is measured in accordance with JIS K 7161:2019 after the elastomer is heated at a curing temperature of the elastomer for 2 hours and then subjected to temperature and humidity adjustment at 23° C., and a relative humidity of 55% for 2 weeks, and the elastic modulus B is measured in accordance with JIS K 7161:2019 after an ISO test piece having a thickness of 4 mm made of a covering layer composition constituting the covering layer is dried at 120° C. for 1 hour.

4 . The strand according to claim 1 , wherein the covering layer contains a filler material having an aspect ratio (long side/short side) of 10 or greater.

5 . The strand according to claim 4 , wherein the filler material having the aspect ratio (long side/short side) of 10 or greater contains a potassium titanate whisker.

6 . The strand according to claim 1 , wherein the thermoplastic resin contains a polyamide resin.

7 . The strand according to claim 6 , wherein the polyamide resin contains diamine-derived structural units and dicarboxylic acid-derived structural units, 70 mol % or greater of the diamine-derived structural units are derived from xylylenediamine, and 70 mol % or greater of the dicarboxylic acid-derived structural units are derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 20 carbon atoms.

8 . The strand according to claim 1 , wherein the elastomer is an elastomer containing a styrene unit.

9 . The strand according to claim 1 , wherein the reinforcing fiber is covered by yarn containing a polyester resin.

10 . The strand according to claim 1 , wherein the reinforcing fiber contained in the core material contains a carbon fiber.

11 . The strand according to claim 1 , wherein
an elastic modulus A and an elastic modulus B satisfy (the elastic modulus A/the elastic modulus B)<0.00500, where the elastic modulus A is measured in accordance with JIS K 7161:2019 after the elastomer is heated at a curing temperature of the elastomer for 2 hours and then subjected to temperature and humidity adjustment at 23° C., and a relative humidity of 55% for 2 weeks, and the elastic modulus B is measured in accordance with JIS K 7161:2019 after an ISO test piece having a thickness of 4 mm made of a covering layer composition constituting the covering layer is dried at 120° C. for 1 hour; and the covering layer contains a filler material having an aspect ratio (long side/short side) of 10 or greater.

12 . The strand according to claim 1 , wherein
the covering layer contains a filler material having an aspect ratio (long side/short side) of 10 or greater and containing a potassium titanate whisker; the thermoplastic resin contains a polyamide resin containing diamine-derived structural units and dicarboxylic acid-derived structural units, 70 mol % or greater of the diamine-derived structural units are derived from xylylenediamine, and 70 mol % or greater of the dicarboxylic acid-derived structural units are derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 20 carbon atoms; the elastomer contains an elastomer containing a styrene unit; the reinforcing fiber is covered by yarn containing a polyester resin; and the reinforcing fiber contained in the core material contains a carbon fiber.

13 . A driving part comprising:
a first member comprising the strand described in claim 1 ; and a second member being in contact with the strand of the first member and containing a thermoplastic resin.

14 . The driving part according to claim 13 , wherein the second member contains a polyamide resin and a filler material having an aspect ratio (long side/short side) of 10 or greater.

15 . The driving part according to claim 13 , wherein the second member contains
a polyamide resin containing diamine-derived structural units and dicarboxylic acid-derived structural units, 70 mol % or greater of the diamine-derived structural units are derived from xylylenediamine, and 70 mol % or greater of the dicarboxylic acid-derived structural units are derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 20 carbon atoms and a potassium titanate whisker.

16 . The driving part according to claim 15 , wherein a composition of a covering layer of the strand and 70 mass % or greater of a composition of the second member are common.

17 . The driving part according to claim 13 , wherein an elastic modulus B and an elastic modulus C satisfy 0.5≤(the elastic modulus B/the elastic modulus C)≤2.0,
where
the elastic modulus B is measured in accordance with JIS K 7161:2019 after an ISO test piece having a thickness of 4 mm made of a covering layer composition constituting the covering layer of the first member is dried at 120° C. for 1 hour, and
the elastic modulus C is measured in accordance with JIS K 7161:2019 after an ISO test piece having a thickness of 4 mm made of a second member composition constituting the second member is dried at 120° C. for 1 hour.

18 . A method for producing a strand, the method comprising:
forming a covering layer by extruding a covering layer composition containing a thermoplastic resin on an outer side of a core material containing a reinforcing fiber impregnated with an elastomer.

19 . The method for producing a strand according to claim 18 , wherein
a yarn containing a polyester resin covers the reinforcing fiber, and a melting point of the polyester resin is higher than a melting point of the thermoplastic resin contained in the covering layer composition.

20 . The method for producing a strand according to claim 18 , wherein the strand is a strand which comprises a core material containing a reinforcing fiber impregnated with an elastomer; and a covering layer containing a thermoplastic resin.

21 . A winding body comprising:
the strand described in claim 1 ; and a core for winding, the core having a radius of 76.2 mm or less, wherein the strand is wound around the core.

Assignees

• Mitsubishi Gas Chemical Co

Inventors

• Matsumoto Nobuhiko

Classifications

• D10B2505/02

  Reinforcing materials; Prepregs · CPC title

• D10B2331/04

  polyesters, e.g. polyethylene terephthalate [PET] · CPC title

• D10B2101/12

  Carbon; Pitch · CPC title

• D02G3/404

  Yarns or threads coated with polymeric solutions · CPC title

• D02G3/38

  Threads in which fibres, filaments, or yarns are wound with other yarns or filaments, {e.g. wrap yarns, i.e. strands of filaments or staple fibres are wrapped by a helically wound binder yarn; (D02G3/32 takes precedence)}; (covering endless core threads with fibres by using open-end spinning techniques D01H4/00) · CPC title