# US 11,110,693 B2 · Laminate and copolymer

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- Number: US 11,110,693 B2
- Document ID: US11110693B2
- Status: Granted
- Kind: B2
- Application number: 16/325,465
- Filed: 2017-07-21
- Published: 2019-07-11
- Granted: 2021-09-07
- Earliest claimed: 2016-09-06
- Assignees: Daikin Industries, Ltd.
- Applicants: Daikin Industries, Ltd.
- Inventors: Yuuki Kuwajima; Toshiaki Masui; Takeshi Inaba
- Web page: https://patentgrep.com/patent/US11110693B2

## CPC

- B32B 27/304: {comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF}
- B32B 7/06: permitting easy separation
- B32B 25/08: of synthetic resin
- B32B 25/14: comprising {synthetic rubber copolymers (B32B25/18 and B32B25/20 take precedence)}
- B32B 25/16: comprising polydienes {homopolymers} or poly-halodienes {homopolymers (B32B25/12 takes precedence)}
- B32B 27/322: {comprising halogenated polyolefins, e.g. PTFE}
- C08F 214/18: Monomers containing fluorine
- C08F 214/262: {with fluorinated vinyl ethers}
- C08F 216/14: Monomers containing only one unsaturated aliphatic radical
- B32B 2250/24: All layers being polymeric
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/50: having particular mechanical properties
- B32B 2307/546: Flexural strength; Flexion stiffness
- B32B 2307/724: Permeability to gases, adsorption
- B32B 2307/726: Permeability to liquids, absorption
- B32B 2307/7265: Non-permeable
- B32B 2307/732: Dimensional properties
- B32B 2319/00: Synthetic rubber
- B32B 2327/18: PTFE, i.e. polytetrafluoroethylene
- B32B 2597/00: Tubular articles, e.g. hoses, pipes
- C08F 2800/10: as molar percentages
- F16L 11/04: made of rubber or flexible plastics
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

The invention provides a laminate in which a fluororesin layer and a rubber layer are firmly bonded to each other and the fluororesin layer has low fuel permeability and is less likely to suffer solvent cracking. The laminate includes a rubber layer (A) and a fluororesin layer (B). The fluororesin layer (B) contains a copolymer containing a chlorotrifluoroethylene unit, a tetrafluoroethylene unit, and a perfluoroalkyl vinyl ether unit. The copolymer contains 96.0 to 97.4 mol % of the chlorotrifluoroethylene unit and the tetrafluoroethylene unit relative to all the monomer units constituting the copolymer and 2.6 to 4.0 mol % of the perfluoroalkyl vinyl ether unit relative to all the monomer units constituting the copolymer.

## Claims

### Claim 1

A laminate comprising a rubber layer (A) and a fluororesin layer (B),
the fluororesin layer (B) comprising a copolymer containing a chlorotrifluoroethylene unit, a tetrafluoroethylene unit, and a perfluoroalkyl vinyl ether unit,
the copolymer containing 96.0 to 97.4 mol % of the chlorotrifluoroethylene unit and the tetrafluoroethylene unit relative to all the monomer units constituting the copolymer and 2.6 to 4.0 mol % of the perfluoroalkyl vinyl ether unit relative to all the monomer units constituting the copolymer,
wherein a ratio of the chlorotrifluoroethylene unit to and the tetrafluoroethylene unit is 15-25 to 85-75, and
wherein the perfluoroalkyl vinyl ether is represented by the following formula:
CF2=CF—O—Rf
wherein Rf is a C1-C5 perfluoroalkyl group.

### Claim 2 (depends on 1)

The laminate according to claim 1,
wherein the rubber layer (A) contains a non-fluoroelastomer.

### Claim 3 (depends on 1)

The laminate according to claim 1,
wherein the rubber layer (A) contains at least one non-fluoroelastomer selected from the group consisting of acrylonitrile-butadiene rubber, a hydride of acrylonitrile-butadiene rubber, epichlorohydrin rubber, acrylic rubber, and a rubber blend of two or more thereof.