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Gas barrier laminate

A gas barrier, laminated body technology, applied in the direction of layered products, flexible containers, flexible coverings, etc., can solve the problems of uneven coating film, the laminated body does not show gas barrier properties, etc., to achieve excellent productivity and economy. , the effect of excellent gas barrier properties

Inactive Publication Date: 2015-05-13
UNITIKA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The inventors of the present invention have studied the method of Patent Document 1 by using a curtain coater or the like to simultaneously apply a solvent-based undercoat layer-forming paint and a water-based gas barrier layer-forming paint, but the coating film becomes distorted when dried. Inhomogeneous, the resulting laminate does not exhibit gas barrier properties

Method used

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Examples

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preparation example Construction

[0073] The coating liquid can be prepared by a known method using a dissolution tank equipped with a stirrer. For example, a method in which polycarboxylic acid and polyol are separately prepared as aqueous solutions and mixed before coating is preferable. At this time, if the above-mentioned basic compound is previously added to the aqueous solution of polycarboxylic acid, the stability of the aqueous solution can be improved.

[0074] In addition, in the present invention, when a polycarboxylic acid and a polyamine are mixed to prepare an aqueous coating liquid, it is preferable to add a base to the polycarboxylic acid in advance in order to suppress gelation. The base may be any base as long as it does not inhibit the gas barrier properties of the obtained gas barrier laminate. It can be volatilized by drying and heat treatment, preferably ammonia. The amount of the base added is preferably 0.6 equivalent or more, more preferably 0.7 equivalent or more, and still more pref...

Embodiment 1

[0163]Nylon 6 resin and master batches were mixed so that the content of magnesium oxide was 0.1% by mass. This mixture was put into an extruder and melted in a barrel at 270°C. The molten material was extruded into a sheet form from a T-die orifice, and quenched by closely contacting with a rotating drum cooled to 10° C. to obtain an unstretched plastic substrate (I) film with a thickness of 150 μm. The obtained unstretched film was transferred to a warm water bath at 50° C., and subjected to a water immersion treatment for 2 minutes.

[0164] Next, the PVA aqueous solution and the EMA aqueous solution were mixed so that the mass ratio (solid content) of PVA to EMA was 50 / 50 to obtain a coating solution for forming a gas barrier layer (II) with a solid content of 10% by mass. This coating liquid was applied to one side of the unstretched film subjected to the water immersion treatment, and then dried.

[0165] The ends of the film were held in clips of a tenter-type simulta...

Embodiment 2～16、18、20～34

[0166] Embodiment 2~16, 18, 20~34, comparative example 1~4

[0167] Nylon 6 resin and masterbatches were mixed so as to have the metal compound content described in Tables 1 to 2. In addition, except that the thickness after stretching was set to the thickness described in Tables 1 to 2, the same method as in Example 1 was obtained. Stretch the plastic substrate (I) film, and perform water immersion treatment.

[0168] Next, a gas barrier layer (II) was prepared in the same manner as in Example 1, except that the types and mass ratios (solid content) of other resins such as PVA and polycarboxylic acids were those described in Tables 1 and 2. Use coating fluid.

[0169] Except for using the obtained coating liquid so that the thickness after stretching was the thickness described in Tables 1 to 2, it was coated on an unstretched film in the same manner as in Example 1, dried, and then simultaneously biaxially stretched to obtain A gas barrier laminate was obtained.

[0170] ...

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Abstract

A gas barrier laminate in which a gas barrier layer (II) is laminated on a plastic substrate (I), the gas barrier laminate characterized in that the plastic substrate (I) contains 0.1-70% by mass of a metal compound, and the gas barrier layer (II) contains a polycarboxylic acid.

Description

technical field [0001] The present invention relates to a gas-barrier laminate having excellent gas-barrier properties even under high humidity. Background technique [0002] Plastic films such as polyamide films are excellent in strength, transparency, and formability, and thus are widely used as packaging materials. However, due to the high gas permeability of these plastic films such as oxygen, when used for packaging of general food, retort food, cosmetics, medical supplies, pesticides, etc., sometimes due to the gas such as oxygen permeating the film during long-term storage, , resulting in deterioration of the contents. Therefore, plastic films used for these packaging applications need to have gas barrier properties, and in addition, gas barrier properties under high humidity are also required for packaging of moisture-containing foods and the like. [0003] As a method of imparting gas barrier properties to a plastic film, there is a method of laminating a gas barr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/30B32B27/20B32B27/34B65D30/02B65D65/40B65D81/24C08J7/048
CPCB32B27/08B32B27/18B32B27/20B32B27/30B32B27/34B32B27/36B65D31/02B65D65/40B65D81/24B32B27/28B32B27/304B32B27/306B32B27/32B32B27/365C08J2367/00C08J2367/02C08J2377/00C08J2377/02C08J2429/04C08J2433/02Y10T428/1341Y10T428/31725Y10T428/31786B32B2307/518B32B2307/7244B32B2439/46C08J7/0427C08J7/048
Inventor 前原淳冈部贵史南條一成穴田有弘
Owner UNITIKA LTD
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