Laminate, multilayered structure, and method for producing the same

Patent metadata

Field	Value
Publication number	US-11020942-B2
Application number	US-201716305683-A
Country	US
Kind code	B2
Filing date	May 31, 2017
Priority date	May 31, 2016
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

Provided are: a laminate having an outer surface thereof that is highly adhesive to a rubber material, and having sufficient gas barrier properties, interlayer adhesiveness and flex resistance; a multilayered structure including such a laminate; and a method for producing the same. A laminate including: a plurality of gas barrier layers (A) formed from a polymer including a gas barrier resin; and an elastomer layer (B) including at least one adhesive layer (B1), wherein a sum of number of the gas barrier layers (A) and number of the elastomer layer (B) is 5 or greater and 300 or less, the adhesive layer (B1) is laminated as at least an outermost layer, and the adhesive layer (B1) includes a styrene elastomer and is formed from a polymer having an iodine value of 200 or greater and 300 or less.

First claim

The invention claimed is:

1. A laminate comprising:
a plurality of as barrier layers (A) formed from a polymer comprising a gas barrier resin; and
one or a plurality of elastomer layer(s) (B) comprising at least one adhesive layer (B1), wherein
a sum of number of the gas barrier layers (A) and number of the elastomer layer(s) (B) is from 5 to 300,
the adhesive layer (B1) is laminated as at least one outermost layer,
the adhesive layer (B1) comprises a styrene elastomer and is formed from a polymer having an iodine value of 200 to 300, and
an average thickness of the adhesive layer (B1) laminated as the outermost layer is from 0.1 μm to 10 μm.

2. The laminate according to claim 1 , where
the styrene elastomer comprises an epoxy group in a main chain thereof, and
a content of the epoxy group in a total polymer from which the adhesive layer (B1) is formed is from 0.1 mmol/g to 2 mmol/g.

3. The laminate according to claim 1 , wherein
an average thickness of each one layer of the gas barrier layers (A) is from 0.1 μm to 15 μm, and
an average thickness of each one layer of the elastomer layer(s) (B) is from 0.1 μm to 30 μm.

4. The laminate according to claim 1 , wherein a total thickness of all the gas barrier layers (A) and all the elastomer layer(s) (B) is from 15 μm to 500 μm.

5. The laminate according to claim 1 , wherein the one or a plurality of elastomer layer(s) (B) comprises a further elastomer layer (B2) other than the adhesive layer (B1).

6. The laminate according to claim 5 , wherein each of the gas barrier layer (A) and the further elastomer layer (B2) are laminated alternately.

7. The laminate according to claim 5 , wherein the further elastomer layer (B2) is formed from a polymer comprising a polyurethane elastomer.

8. The laminate according to claim 1 , wherein
every one of the elastomer layer(s) (B) is the adhesive layer (B1), and
each of the gas barrier layers (A) the adhesive layer (B1) are laminated alternately.

9. A method for producing the laminate according to claim 1 , the method comprising coextruding:
a polymer for forming the gas barrier layers (A); and
a polymer for forming the one or a plurality of elastomer layer(s) (B).

10. A multilayered structure comprising:
the laminate according to claim 1 ; and
a diene rubber layer (C) laminated on an outer surface of the adhesive layer (B1) having been laminated as the outermost layer of the laminate.

11. A method for producing the multilayered structure according to claim 10 , the method comprising:
coextending a polymer for forming the gas barrier layers (A), and a polymer for forming the one or a plurality of elastomer layer(s) (B); and
thermally bonding a diene rubber layer (C) to a structure obtained after the coextruding.

Assignees

• Kuraray Co

Inventors

• Suzuki Makoto
• Nonaka Yasuhiro

Classifications

• B29K2995/0067

  non-permeable · CPC title

• B29K2009/06

  SB polymers, i.e. butadiene-styrene polymers · CPC title

• B29C48/21

  the layers being joined at their surfaces · CPC title

• B29C48/185

  comprising six or more components, i.e. each component being counted once for each time it is present, e.g. in a layer · CPC title

• B29K2075/00

  Use of {PU, i.e.} polyureas or polyurethanes {or derivatives thereof}, as moulding material · CPC title