Resin composition laminate and laminate film

• US 6,426,135 B1
• Filed: 01/21/2000
• Issued: 07/30/2002
• Est. Priority Date: 01/24/1994
• Status: Expired due to Term

• Current Assignee: Unitika Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Kuroda, Toshiya, Kawakita, Toshio, Kotani, Kozo, Sakaya, Taiichi
• Primary Examiner(s): Resan, Stevan A.
• Assistant Examiner(s): TARAZANO, DONALD LAWRENCE
• Application Number:
  US09/489,476
• Time in Patent Office: 921 Days
• Field of Search: 428/34.6, 428/34.7, 428/35.4, 428/35.9, 428/36.6, 428/36.7, 428/323, 428/325, 428/324, 428/328, 428/329, 428/330, 428/331, 428/411.1, 428/500, 428/515, 428/688, 428/221, 428/522, 428/520, 428/516
• US Class Current: 428/323
• CPC Class Codes: B32B 27/06 as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: C08J 7/0423 with at least one layer of inorganic material and at least one layer of a composition containing a polymer binder
• CPC Class Codes: C08J 7/048 Forming gas barrier coatings
• CPC Class Codes: C08K 2201/008 Additives improving gas barrier properties
• CPC Class Codes: C08K 2201/016 Additives defined by their aspect ratio
• CPC Class Codes: C08K 3/346 Clay
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/251 Mica
• CPC Class Codes: Y10T 428/252 Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 428/259 Silicic material
• CPC Class Codes: Y10T 428/31913 Monoolefin polymer
• CPC Class Codes: Y10T 428/31928 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31935 Ester, halide or nitrile of addition polymer

Abstract

A resin composition comprising: a polyvinyl alcohol; and an inorganic laminar compound having an aspect ratio of not less than 50 and not more than 5000, which has a volume ratio of (inorganic laminar compound/polyvinyl alcohol) in the range of (5/95) to (30/70); and a laminate or laminate film comprising, as at least a portion thereof, a layer or portion (1) comprising such a resin composition. The resin composition, laminate or laminate film may exhibit a good gas barrier property while substantially retaining a good film strength.

Claims

1. A laminate structure comprising a first material layer having a first and second surface, a barrier layer of a resin composition disposed on the first surface of the first layer, and a second material layer disposed on at least one of the second surface of the first layer or the barrier layer;

in which said resin composition comprises;

(a) a polyvinyl alcohol resin having a saponification degree of not less than 70% and

(b) an inorganic laminar compound having an aspect ratio of 200 to 3000 having a layered crystal structure, wherein unit crystal layers are mutually stacked to form said layered structure, and said inorganic laminar compound is swollen or cleft when in a solvent;

said composition has a volume ratio of;

inorganic laminar compound/polyvinyl alcohol, in the range of 5/95 to 30/70, and said laminate structure exhibits an oxygen permeability of not more than 0.5 cc/m²-day-atm under the condition of 30°

C. and 60% relative humidity.

2. The laminate structure according to claim 1, which has the shape of a film.

3. The laminate structure according to claim 1, wherein either the first material layer or the second material layer comprises polypropylene and is dry laminated to the barrier layer.

4. The laminate structure according to claim 1, wherein the barrier layer is formed by applying a coating liquid containing the resin composition mixture onto a surface of the first material layer or second material layer and then drying the resultant coating.

5. The laminate structure according to claim 1, wherein the barrier layer is formed and laminated onto at least one of the first and second material layers.

6. The laminate structure according to claim 1, wherein the first material layer or the second material layer is extrusion-laminated onto the barrier layer.