Resin mixture and multilayer structure

Patent metadata

Field	Value
Publication number	US-10975236-B2
Application number	US-201113883194-A
Country	US
Kind code	B2
Filing date	Nov 1, 2011
Priority date	Nov 2, 2010
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

Provided is a resin mixture, comprising: polyolefin (A); a saponified ethylene-vinyl acetate copolymer (B); and an acid modified olefin-vinyl carboxylate copolymer (C), wherein the acid modified olefin-vinyl carboxylate copolymer (C) has an olefin content of from 50 to 95 mol %, and a difference between an ethylene content of the saponified ethylene-vinyl acetate copolymer (B) and the olefin content of the acid modified olefin-vinyl carboxylate copolymer (C) is within a range of from 20 to 70 mol %. This enables to provide a resin mixture that contains polyolefin and an EVOH, and even in continuous melt molding over a long period of time, has a less amount of screw buildup of a degraded material and also is reduced in generation of fish-eyes, cords, and streaks in a molded product obtained therefrom.

First claim

The invention claimed is:

1. A resin mixture, comprising:
polyolefin;
a saponified ethylene-vinyl acetate copolymer;
an acid modified olefin-vinyl carboxylate copolymer which, prior to acid-modification, consists of an olefin monomer and a vinyl carboxylate monomer;
an olefin-vinyl carboxylate copolymer that is not acid-modified and which consists of an olefin monomer and a vinyl carboxylate monomer,
wherein the acid modified olefin-vinyl carboxylate copolymer has an olefin content of from 50 to 95 mol %,
wherein a difference between an ethylene content of the saponified ethylene-vinyl acetate copolymer and the olefin content of the acid modified olefin-vinyl carboxylate copolymer is from 20 to 70 mol %,
wherein the saponified ethylene-vinyl acetate copolymer has a ratio of 0.03 mol % or more of a total of a carboxylic acid unit and a lactone ring unit in a polymer terminal to a total of an ethylene unit, a vinyl alcohol unit and a vinyl ester unit,
wherein the saponified ethylene-vinyl acetate copolymer has an ethylene content of from 25 to 60 mol % and has a degree of saponification of 80% or more,
wherein the olefin-vinyl carboxylate copolymer that is not acid-modified has an olefin content of from 50 to 98 mol %, and the resin mixture comprises the olefin-vinyl carboxylate copolymer that is not acid-modified in an amount of from 0.01 to 20 mass % to a total of the resin mixture, and
wherein a mass ratio of the acid modified olefin-vinyl carboxylate copolymer to the olefin-vinyl carboxylate copolymer that is not acid-modified is from 0.45/2.55 to 0.45/0.2.

2. The resin mixture according to claim 1 ,
wherein the acid modified olefin-vinyl carboxylate copolymer comprises acid modification in an amount of from 0.01 to 2 mmol/g.

3. The resin mixture according to claim 1 , wherein a content of the acid modified olefin-vinyl carboxylate copolymer ranges from 0.1 to 30 parts by mass relative to 100 parts by mass of the saponified ethylene-vinyl acetate copolymer.

4. The resin mixture according to claim 1 ,
wherein the resin mixture comprises the saponified ethylene-vinyl acetate copolymer in an amount of from 0.1 to 30 mass %.

5. The resin mixture according to claim 1 ,
wherein a difference in solubility parameters between the acid modified olefin-vinyl carboxylate copolymer and the saponified ethylene-vinyl acetate copolymer is from 0.5 to 4.0 (cal/cm 3 ) 1/2 .

6. The resin mixture according to claim 1 , further comprising:
an olefin-vinyl carboxylate copolymer that is not acid-modified and which consists of an olefin monomer and a vinyl carboxylate monomer,
wherein the olefin-vinyl carboxylate copolymer that is not acid-modified has an olefin content of from 55 to 98 mol %, and the resin mixture comprises the olefin-vinyl carboxylate copolymer that is not acid modified in an amount of from 0.01 to 20 mass % to a total of the resin mixture.

7. The resin mixture according to claim 1 , further comprising:
a lubricant,
wherein the resin mixture comprises the lubricant in an amount of from 0.005 to 1.0 mass %.

8. The resin mixture according to claim 1 , further comprising:
a pigment,
wherein the resin mixture comprises the pigment in an amount of from 0.0001 to 10 mass %.

9. A multilayer structure, comprising a layer obtained by a process comprising melt molding the resin mixture according to claim 1 .

10. The resin mixture according to claim 3 ,
wherein the acid modified olefin-vinyl carboxylate copolymer comprises acid modification in an amount of from 0.01 to 2 mmol/g.

11. The resin mixture according to claim 3 ,
wherein the resin mixture comprises the saponified ethylene-vinyl acetate copolymer in an amount of from 0.1 to 30 mass %.

12. The resin mixture according to claim 3 ,
wherein a difference in solubility parameters between the acid modified olefin-vinyl carboxylate copolymer and the saponified ethylene-vinyl acetate copolymer is from 0.5 to 4.0 (cal/cm 3 ) 1/2 .

13. The resin mixture according to claim 3 , further comprising:
an olefin-vinyl carboxylate copolymer that is not acid-modified and which consists of an olefin monomer and a vinyl carboxylate monomer,
wherein the olefin-vinyl carboxylate copolymer that is not acid-modified has an olefin content of from 50 to 98 mol %, and the resin mixture comprises the olefin-vinyl carboxylate copolymer that is not acid modified in an amount of from 0.01 to 20 mass % to a total of the resin mixture.

14. The resin mixture according to claim 3 , further comprising:
a lubricant,
wherein the resin mixture comprises the lubricant in an amount of from 0.005 to 1.0 mass %.

15. The resin mixture according to claim 3 , further comprising:
a pigment,
wherein the resin mixture comprises the pigment in an amount of from 0.0001 to 10 mass %.

16. A multilayer structure, comprising a layer obtained by a process comprising melt molding the resin mixture according to claim 3 .

Assignees

• Igarashi Takeyuki
• Tai Shinji
• Kuraray Co

Inventors

• Igarashi Takeyuki
• Tai Shinji

Classifications

• C08L23/10 Primary

  Homopolymers or copolymers of propene · CPC title

• C08L31/02

  Homopolymers or copolymers of esters of monocarboxylic acids · CPC title

• C08L23/12

  Polypropene · CPC title

• B32B2270/00

  Resin or rubber layer containing a blend of at least two different polymers · CPC title

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title