RESIN MIXTURE AND MULTILAYER STRUCTURE

• US 20130225756A1
• Filed: 11/01/2011
• Published: 08/29/2013
• Est. Priority Date: 11/02/2010
• Status: Active Grant

• Current Assignee: Kuraray Company Limited
• Original Assignee: Kuraray Company Limited
• Inventors: Igarashi, Takeyuki, Tai, Shinji
• Granted Patent: US 10,975,236 B2
• Time in Patent Office: Days
• US Class Current: 524/524
• CPC Class Codes: B32B 2270/00 Resin or rubber layer containing a blend of at least two different polymers
• CPC Class Codes: B32B 2272/00 Resin or rubber layer comprising scrap, waste or recycling material
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/306 comprising vinyl acetate or vinyl alcohol (co)polymers
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: C08K 5/0016 Plasticisers
• CPC Class Codes: C08L 2203/16 used for films
• CPC Class Codes: C08L 2205/03 containing three or more polymers in a blend
• CPC Class Codes: C08L 23/0853 Vinylacetate
• CPC Class Codes: C08L 23/0861 Saponified vinylacetate
• CPC Class Codes: C08L 23/10 Homopolymers or copolymers of propene
• CPC Class Codes: C08L 23/12 Polypropene
• CPC Class Codes: C08L 31/02 Homopolymers or copolymers of esters of monocarboxylic acids
• CPC Class Codes: C08L 31/04 Homopolymers or copolymers of vinyl acetate
• CPC Class Codes: C08L 31/06 Homopolymers or copolymers of esters of polycarboxylic acids
• CPC Class Codes: C08L 51/06 grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond

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.

Claims

1. A resin mixture, comprising:

polyolefin;

a saponified ethylene-vinyl acetate copolymer; and

an acid modified olefin-vinyl carboxylate copolymer,

wherein the acid modified olefin-vinyl carboxylate copolymer has an olefin content of from 50 to 95 mol %, and 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 %.

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 the saponified ethylene-vinyl acetate copolymer has the ethylene content of from 20 to 60 mol % and has a degree of saponification of 80% or more.

4. The resin mixture according to claim 1,

wherein the saponified ethylene-vinyl acetate copolymer has a ratio of 0.03 mol % or more of a total of an 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

5. The resin mixture according claim 1,

wherein the saponified ethylene-vinyl acetate copolymer comprises the acid modified olefin-vinyl carboxylate copolymer in an amount of from 0.1 to 30 mass %.

6. 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 %.

7. 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/cm³)^1/2.

8. The resin mixture according to claim 1, further comprising:

alkali metal,

wherein a molar ratio of a content of the alkali metal to an amount of acid modification of the resin mixture is from 0.05 to 75.

9. The resin mixture according to claim 1, further comprising:

an unmodified olefin-vinyl carboxylate copolymer,

wherein the unmodified olefin-vinyl carboxylate copolymer has an olefin content of from 50 to 98 mol %, and the resin mixture comprises the unmodified olefin-vinyl carboxylate copolymer in an amount of from 0.01 to 20 mass % to a total of the resin mixture.

10. The resin mixture according claim 1, further comprising:

a lubricant,

wherein the resin mixture comprises the lubricant in an amount of from 0.005 to 1.0 mass %.

11. 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 %.

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

13. A method of producing the resin mixture according claim 1, comprising:

mixing a recovery of a multilayer structure comprising a layer of a resin composition comprising the polyolefin and a layer of the saponified ethylene-vinyl acetate copolymer, and a recycling agent of a resin composition comprising the acid modified olefin-vinyl carboxylate copolymer.