# US 8,541,082 B2 · Laminated resin formed body, method for producing laminated resin formed body, and multilayer article

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- Number: US 8,541,082 B2
- Document ID: US8541082B2
- Status: Granted
- Kind: B2
- Application number: 10/560,910
- Filed: 2004-06-16
- Published: 2007-05-03
- Granted: 2013-09-24
- Earliest claimed: 2003-06-17
- Assignees: Daikin Industries, Ltd.
- Applicants: Takeshi Inaba
- Inventors: Takeshi Inaba
- Web page: https://patentgrep.com/patent/US8541082B2

## CPC

- B32B 1/08: Tubular products
- B32B 27/08: of synthetic resin
- B32B 27/322: {comprising halogenated polyolefins, e.g. PTFE}
- B32B 27/34: comprising polyamides
- B32B 2250/03: 3 layers
- B32B 2250/24: All layers being polymeric
- B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2274/00: Thermoplastic elastomer material
- B32B 2307/714: Inert, i.e. inert to chemical degradation, corrosion
- B32B 2307/7145: Rot proof, resistant to bacteria, mildew, mould, fungi
- B32B 2307/7242: Non-permeable
- B32B 2307/734: Dimensional stability
- B32B 2597/00: Tubular articles, e.g. hoses, pipes
- B32B 2605/08: Cars
- Y10T 428/13: Hollow or container type article [e.g., tube, vase, etc.]
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/1379: Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
- Y10T 428/139: Open-ended, self-supporting conduit, cylinder, or tube-type article
- Y10T 428/1393: Multilayer [continuous layer]
- Y10T 428/31725: Of polyamide
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

It is an object of the present invention to provide a laminated resin molding which comprises a layer of a thermoplastic polymer such as a thermoplastic elastomer and a layer of a thermoplastic resin such as a fluorine-containing ethylenic polymer, is excellent in liquid chemical impermeability, chemical resistance and bacteria resistance, among others, and can be molded by coextrusion without causing foaming or deterioration of the thermoplastic elastomer and, further, has good interlaminar adhesive strength. The invention provides a laminated resin molding comprising a thermoplastic polymer layer (A), a polyamide-based resin layer (B) and a thermoplastic resin layer (C), wherein said thermoplastic polymer layer (A), said polyamide-based resin layer (B) and said thermoplastic resin layer (C) are laminated in that order and firmly adhered to one another, said thermoplastic polymer is to adhere to the polyamide-based resin by thermal fusion bonding, said polyamide-based resin has an amine value of 10 to 60 (equivalents/106 g), said thermoplastic resin contains a functional group and is to thereby firmly adhere to said polyamide-based resin by thermal fusion bonding, said functional group contains carbonyl group.

## Claims

### Claim 1

A laminated resin molding comprising a thermoplastic polymer layer (A), a polyamide-based resin layer (B) and a thermoplastic resin layer (C),
which is a hose or a tube,
which is obtained by a method comprising laminating by the simultaneous multilayer coextrusion technique using a coextruding machine comprising a die and a plurality of extruders each for feeding a resin to said die,
said die temperature being not higher than 230° C.,
wherein said thermoplastic polymer layer (A), said polyamide-based resin layer (B) and said thermoplastic resin layer (C) are laminated in that order and directly firmly adhered to one another,
said thermoplastic polymer is to adhere to the polyamide-based resin by thermal fusion bonding,
the initial adhesive strength between the thermoplastic polymer layer (A) and the polyamide-based resin layer (B) is not lower than 25 N/cm,
the initial adhesive strength between the polyamide-based resin layer (B) and thermoplastic resin layer (C) is not lower than 25 N/cm,
said polyamide-based resin has an amine value of 15 to 35 (equivalents/106 g),
said thermoplastic resin contains a functional group and is to thereby firmly adhere to said polyamide-based resin by thermal fusion bonding,
said functional group contains carbonyl group,
said thermoplastic polymer layer (A) consists essentially of said thermoplastic polymer,
said thermoplastic polymer is a thermoplastic elastomer comprising a polyurethane-based elastomer, and
said thermoplastic resin comprises a fluorine-containing ethylenic polymer.

### Claim 2 (depends on 1)

The laminated resin molding according to claim 1,
wherein the polyamide-based resin has an acid value of not higher than 80 (equivalents/106 g).

### Claim 3 (depends on 1)

The laminated resin molding according to claim 1, which has a modulus of elasticity in tension of lower than 400 MPa.

### Claim 4 (depends on 1)

The laminated resin molding according to claim 1, wherein the polyamide-based resin layer (B) has a thickness not exceeding one fifth of the thickness of the thermoplastic polymer layer (A).

### Claim 5 (depends on 1)

The laminated resin molding according to claim 1, which shows a total luminous transmittance of not lower than 75%.

### Claim 6 (depends on 1)

A method for producing the laminated resin molding according to claim 1,
which comprises laminating by the simultaneous multilayer coextrusion technique using a coextruding machine comprising a die and a plurality of extruders each for feeding a resin to said die,
said die temperature being not higher than 230° C.

### Claim 7 (depends on 1)

The multilayer molded article according to claim 1 which is a liquid chemical-transport tube or a liquid chemical-transport hose each having the thermoplastic polymer layer (A) as an outer layer, the thermoplastic resin layer (C) as an inner layer and the polyamide-based resin layer (B) as an intermediate layer.

### Claim 8 (depends on 1)

The multilayer molded article according to claim 1 which is a tube for feeding a coating or a hose for feeding a coating each having the thermoplastic polymer layer (A) as an outer layer, the thermoplastic resin layer (C) as an inner layer and the polyamide-based resin layer (B) as an intermediate layer.

### Claim 9 (depends on 1)

The multilayer molded article according to claim 1 which is a tube for a drink or a hose for a drink each having the thermoplastic polymer layer (A) as an outer layer, the thermoplastic resin layer (C) as an inner layer and the polyamide-based resin layer (B) as an intermediate layer.