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Adhesive for laminate

A technology of laminated materials and adhesives, applied in the direction of adhesives, adhesive types, adhesive additives, etc., can solve the problems of appearance (peeling deterioration, etc.), to prevent tunnel effect or film offset, reduce costs, and excellent resistance to content The effect of physical properties

Active Publication Date: 2012-01-25
NIPPON POLYURETHANE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the laminated film packaging material manufactured using the adhesive for dry lamination of Patent Document 1 can improve the performance of the laminated film packaging material when it is used to pack contents such as food or medicine and is used for high-temperature treatments such as boiling and retorting. Its adhesive performance, hot water resistance, acid resistance and other content resistance performance, but the appearance (peeling) of the film after high temperature treatment is significantly worse

Method used

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  • Adhesive for laminate
  • Adhesive for laminate

Examples

Experimental program
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Embodiment

[0072] Hereinafter, examples of the present invention will be described in detail, but the explanation of the present invention is not limited to the examples. Unless otherwise specified, % in Synthesis Examples, Examples, and Comparative Examples means "mass %".

[0073] [Synthesis of Polyester Polyol Containing Aromatic Rings in the Molecule and Substantially a Hydroxyl Terminal at the Molecule]

Synthetic example 1

[0075] Add 25 grams of ethylene glycol and 400 grams of neopentyl glycol into a reactor equipped with a stirrer, a thermometer, a nitrogen seal and a cooler. After dissolving at 120°C, add 269 grams of adipic acid and 306 grams of m-benzene Diformic acid was esterified at 220°C under normal pressure. After a certain amount of water was distilled off, 0.03 g of tetrabutyl titanate was added, and the pressure was slowly reduced from normal pressure to 2.7 kPa abs (absolute pressure) over 5 hours. Thereafter, a transesterification reaction was carried out at 220°C for 5 hours to obtain a polyester polyol having an acid value of 0.4 mg KOH / g, a hydroxyl value of 56.1 mg KOH / g, a number average molecular weight of 2,000, and a viscous liquid at room temperature .

[0076] This polyester polyol is referred to as A-1.

[0077] [Synthesis of polyester polyol without aromatic ring in the molecule]

Synthetic example 2

[0079] Add 148 grams of ethylene glycol and 148 grams of diethylene glycol into the same reactor as in Synthesis Example 1, dissolve at 120° C., add 611 grams of adipic acid, and carry out esterification reaction at 220° C. under normal pressure. After a certain amount of water was distilled off, 0.03 g of tetrabutyl titanate was added, and the pressure was slowly reduced from normal pressure to 2.7 kPa abs (absolute pressure) over 5 hours. Thereafter, a transesterification reaction was carried out at 220°C for 5 hours to obtain a polyester multi-polymer with an acid value of 0.3 mg KOH / g, a hydroxyl value of 56.1 mg KOH / g, a number average molecular weight of 2,000, and a viscous liquid at room temperature. alcohol.

[0080] This polyester polyol is referred to as A-2.

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Abstract

Disclosed is an adhesive for laminates which has high initial adhesion, high productivity and good workability while maintaining excellent resistance to contents. Specifically disclosed is an adhesive for laminates composed of a base material solution and an isocyanate curing agent. The base material solution contains at least a polyurethane resin, a silane coupling agent and an organic solvent, and the polyurethane resin is obtained by reacting the following components (A), (B), (C) and (D) at a mass ratio of (A) / (B)=95 / 5-75 / 25 (A) a polyester polyol containing an aromatic ring in a moleculewherein a hydroxyl group substantially forms a molecular end (B) a polyester polyol containing no aromatic ring in a molecule (C) a dimethylolalkanoic acid (D) an organic polyisocyanate.

Description

technical field [0001] The present invention relates to an adhesive, and more particularly to an adhesive suitable for dry laminates of films such as metals. Background technique [0002] Recently, due to reasons such as high strength, good protection of goods, strong adaptability to packaging operations, good packaging publicity effects, and reduced packaging costs due to a large amount of plastic materials and cheap supply, composite flexible packaging has gained popularity as a packaging method. Remarkable development. [0003] As an adhesive for this kind of film laminate, based on the consideration of excellent adhesive performance, cold resistance and heat resistance, and a wide range of adaptability to various plastics, metal foils and other substrates, generally, the adhesives with active hydrogen such as hydroxyl groups The two-component polyurethane-based adhesive consisting of a main agent with isocyanate groups and a curing agent with isocyanate groups has becom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C09J11/06
CPCC08G18/755C08G18/6659C09J175/06C08G18/4202C08G18/4208C08G18/0823C08G18/4236C09J183/04
Inventor 森川幸弘川口忠之小林孝德田口享史
Owner NIPPON POLYURETHANE IND CO LTD
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