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Production method for flexible packaging film

A manufacturing method and flexible packaging technology, applied in the manufacturing field of the process, can solve problems such as promoting overflow phenomenon

Active Publication Date: 2020-10-23
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this becomes what contributes to the above-mentioned overflow

Method used

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  • Production method for flexible packaging film
  • Production method for flexible packaging film
  • Production method for flexible packaging film

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0113] Production Example 1 [Synthesis of Polyisocyanate (A-1)]

[0114] In a flask equipped with a stirrer, a thermometer, and a nitrogen inlet tube, 17 parts of 4,4-diphenylmethane diisocyanate and 38 parts of an MDI mixture ["Lupranate MI" manufactured by BASF Corporation, 4,4'-diphenyl A mixture of methane diisocyanate / 2,4'-diphenylmethane diisocyanate (mass ratio) of 1 / 1] was put into the reaction container, stirred and heated to 80° C. under nitrogen. 11 parts of polypropylene glycol with a number average molecular weight of 400 (hereinafter abbreviated as "PPG"), 22 parts of PPG with a number average molecular weight of 1000, and 12 parts of PPG with a number average molecular weight of 2000 were added dropwise, stirring for 5- After 6 hours, the carbamation reaction was complete. The NCO group content rate of the obtained polyisocyanate was 13.8%, and the melt viscosity at 40 degreeC was 1500 mPa.s. Hereinafter, this polyisocyanate is abbreviated as "A-1".

manufacture example 2

[0115] Production Example 2 [Synthesis of Polyisocyanate (A-2)]

[0116] In a flask equipped with a stirrer, a thermometer, and a nitrogen gas introduction tube, 14 parts by mass of 4,4-methylene bis-diphenylisocyanate and 42 parts of an MDI mixture (the above-mentioned "Lupranate MI" manufactured by BASF Corporation) were charged into the reaction container. Stir and heat to 80° C. under nitrogen. 44 parts of polyester polyol resin ("POLYLITE OD-X-2376" manufactured by DIC Corporation, acid value 0.8mgKOH / g, molecular weight about 1000) was added dropwise, stirred for about 5 to 6 hours, and the carbamic acid The esterification reaction is complete. The NCO group content of the obtained polyisocyanate was 15.0%, and the melt viscosity at 40° C. was 2000 mPa·s. Hereinafter, this polyisocyanate is abbreviated as "A-2".

manufacture example 3

[0117] Production Example 3 [Synthesis of Polyisocyanate (A-3)]

[0118] In a flask equipped with a stirrer, a thermometer, and a nitrogen introduction tube, 35 parts of 4,4-diphenylmethane diisocyanate was put into a reaction container, and it heated to 80 degreeC with stirring under nitrogen. 5 parts of trifunctional PPG with a number average molecular weight of 400 (manufactured by Asahi Glass Co., Ltd. "Excenol 430"), 18 parts of PPG with a number average molecular weight of 1000, and 32 parts of PPG with a number average molecular weight of 2000 were added dropwise, stirring for 5 to 6 hours, the carbamate reaction was complete. After the reaction, 5 parts of isocyanurate body of 1,6-hexamethylene diisocyanate (manufactured by Covestro "Desmodul N3300"), 5 parts of polymerized diphenylmethane diisocyanate (manufactured by BASF " Lupranate M20S") and stirred for 30 minutes. The NCO group content of the obtained polyisocyanate was 10.0%, and the melt viscosity at 40° C. w...

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Abstract

The production method is for a flexible packaging film that is a laminate of a first substrate and a second substrate having interposed therebetween a reactive adhesive of a polyisocyanate composition(X) and a polyol composition (Y), the method comprising a two-part application step for bringing a liquid mixture of the polyisocyanate composition (X) and the polyol composition (Y) applied to the first substrate into contact with a catalyst (Z) formed as dots on the second substrate, and performing bonding under pressure. The substrates are each preferably a plastic film, a metal vapor deposition film, or a metal foil. A non-stretchable film is preferably used as the second substrate.

Description

technical field [0001] The present invention relates to a production method of a film for flexible packaging, particularly a production method having a step of separately coating a catalyst. Background technique [0002] Conventionally, reactive adhesives such as two-component curing type polyurethane resin adhesives have been widely used as adhesives for films for flexible packaging. [0003] Back printing is performed on a plastic film, an adhesive is applied on the surface of the ink, and another plastic film is laminated. Therefore, the ink becomes an obstacle to finishing the appearance neatly, and an improvement of the appearance is required. [0004] In addition, a soft packaging material using a plastic laminate preferably has a hard texture. The harder the adhesive coating film is, the better the texture is. Therefore, it is desirable to obtain such a product. [0005] In addition, there are also desirable performances from the viewpoint of improving the production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04B32B27/40B32B37/12B65D65/40C08G18/10C08G18/16C08G18/36C08G18/38C08G18/42C08G18/48C09J5/04C09J11/06
CPCB32B37/12C08G18/10C09J5/04C09J175/04C09J2475/00C09J2301/204C08G18/246C08G18/168C08G18/227C08G18/4825C08G18/4829C08G18/7671C08G18/5024B32B2255/10B32B7/12B32B27/308B32B27/306B32B2250/02B32B2307/518B32B27/34B32B2255/26B32B27/286B32B27/302B32B27/285B32B15/088B32B15/082B32B27/32B32B27/281B32B15/18B32B2553/00B32B27/365B32B2255/205B32B27/36B32B27/10B32B15/20B32B15/09B32B15/12B32B15/085B32B27/304B32B27/08C08G18/48C08G18/36C08G18/50C08G18/792C08G18/7664C08G18/725C08K5/103B32B27/40B65D65/40C08G18/16C08G18/3819C08J5/18B32B37/10
Inventor 波多清实高桥茂和
Owner DIC CORP
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