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Modified ethylene-based films to promote isocyanate chemical reactions in polyurethane laminating adhesives

一种多层薄膜、乙烯基聚合物的技术，应用在促进异氰酸酯在聚氨酯层压粘合剂中化学反应的改性的乙烯基薄膜领域，能够解决不能增加粘度、不会具有粘合强度、层压体有缺陷等问题

Inactive Publication Date: 2015-07-01
DOW GLOBAL TECH LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If an excess of OH-terminated components is added, the adhesive will not have the desired bond strength and the laminate may be defective
Also, the mixed adhesive cannot increase viscosity too quickly, or it is difficult to form a laminate

Method used

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  • Modified ethylene-based films to promote isocyanate chemical reactions in polyurethane laminating adhesives
  • Modified ethylene-based films to promote isocyanate chemical reactions in polyurethane laminating adhesives
  • Modified ethylene-based films to promote isocyanate chemical reactions in polyurethane laminating adhesives

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0017] As discussed above, the present invention provides a multilayer film comprising at least two layers A and B:

[0018] A. Film layer A formed from composition A comprising at least the following components: vinyl polymer and one of the following components (1 or 2):

[0019] 1) at least one polyol, alkoxylated amine, alkoxylated amide, amine-containing compound, and / or hydroxyl-containing compound; and a curing catalyst; or

[0020] 2) a curing catalyst comprising at least one hydroxyl group and at least one organometallic salt, or at least one hydroxyl group and a tertiary amine; and

[0021] B. Film layer B formed from a composition B comprising at least one isocyanate; and wherein film layer A is in contact with film layer B.

[0022] In one embodiment, the invention is a multilayer film according to any one or more of the embodiments described herein, and wherein the film consists essentially of layer A and layer B.

[0023] In a specific embodiment, the film layer...

Embodiment 1

[0167] The binder was diluted to approximately 40% solids with ethyl acetate. The adhesive was applied to the foil side of a "PET / Al prelaminate" sheet (approximately 20x30 cm) using a wire wound rod. A strip of paper 5 cm wide and 20 cm long was placed across the center of the sheet to provide an unlaminated strip area for separation of the film for the peel test. The polyethylene film was corona treated and then laminated to the adhesive applied to the aluminum foil by applying pressure at about 180°F (82°C) using steel nip rolls. The laminate was placed between two steel plates and stored in a sealed vacuum drying oven containing anhydrous calcium sulfate desiccant and purged with dry nitrogen. Cut into 15 millimeter (mm) strips at the intervals specified in the table and test for T-peel adhesion on a Thwing Albert tester at a speed of 4 inches (10 cm) / min.

[0168] Table 1

[0169] Laminated structure of embodiment 1

[0170]

[0171] The isocyanate-terminated p...

Embodiment 2

[0182] Two-layer polyethylene films were prepared, one layer containing the catalyst or a mixture of catalyst and ATMER 100, and the other layer containing no additives. The aim is to have the additive concentrated enough to contact the side of the adhesive film. This allows for more efficient use of additives.

[0183] The PE film in this example has a two-layer structure, the outer layer contains a 33.3 volume percent (vol%) sealant layer, and the inner layer is pure DOWLEX 2045G polyethylene resin. The outer layer was prepared by dry blending DOWLEX 2045G polyethylene resin and an additive masterbatch (containing polyol or catalyst) at a certain blend ratio. Except that DOWLEX 2045G polyethylene resin was used instead of DOWLEX 5056NG polyethylene resin, the same method as in Example 1 was used to prepare the additive masterbatch. The additives used were FASCAT 9102 (butyltin tris(2-ethylhexanoate)) and ATMER 100.

[0184] Double layer PE film is produced by using Colin ...

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Abstract

In the construction of a multilayer film in which an ethylene-based polymer layer is joined to one another layer by a polyurethane (PU) adhesive, the rate of cure and the degree of cure of the PU adhesive are accelerated by incorporating into the ethylene-based polymer layer a functional compound with active hydrogens, e.g., a polyol, and / or a cure catalyst, e.g., an amine, zinc or tin-based compound. The catalyst and reactive functionality may be present on the same molecule (e.g. alkoxylated amine or zinc ricinoleate). The catalyst and isocyanate reactive compound will migrate into the PU adhesive over time and accelerate the rate and promote the degree of PU adhesive cure, and the functional compound will promote the migration of the cure catalyst into the PU adhesive. In turn, this accelerated cure inhibits the migration of residual, monomeric amines from the PU adhesive into and through the ethylene-based polymer.

Description

[0001] References to related applications [0002] This application claims priority to US Provisional Patent Applications 61 / 695,654 and 61 / 695,679, filed August 31, 2012. Background of the invention [0003] Laminates are useful for food packaging. See, for example, International Publications WO2013 / 043635 and WO2013 / 043652. For laminates comprising polyurethane (PU) adhesives, the adhesive must be nearly fully or completely cured before it can be used for lamination. This is especially important if the isocyanate is an aromatic isocyanate, since any unreacted isocyanate can react with moisture to form primary aromatic amines (PAAs), which can be a food hazard if they come into contact with food. Two-part polyurethane adhesives are typically formulated to provide an excess of isocyanate. Crosslinking by reaction of isocyanate and ambient moisture is a partial cure process. This process can be slow, especially in dry conditions. If an excess of the OH-terminated component...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/08B32B15/085B32B15/09B32B15/20B32B27/10B32B27/32B32B27/34B32B27/36
CPCB32B27/32B32B27/40B32B27/08B32B15/20B32B27/34B32B2255/06B32B2439/70B32B15/08B32B15/085B32B15/09B32B27/36B32B2255/26B32B2439/80B32B27/10B32B2260/046Y10T428/31587C08J5/18C08L23/04B32B2553/00
Inventor X·陈R·L·麦克吉D·E·维耶蒂K·米亚克L·F·布林克曼
Owner DOW GLOBAL TECH LLC
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