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Moisture-curable hot-melt adhesive agent

A hot-melt adhesive, moisture curing technology, applied in the direction of adhesive types, polyurea/polyurethane adhesives, adhesives, etc., can solve hot-melt adhesive yellowing, difficult light resistance, Cracking and other problems, to achieve the effect of improved adhesion, excellent adhesion, and improved light resistance

Inactive Publication Date: 2015-09-09
HENKEL KGAA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When moisture-curable hot-melt adhesives are used as house interior and automotive interior materials, due to sunlight (ultraviolet rays) transmitted through glass, the cured moisture-curable hot-melt Permanent adhesives may turn yellow and experience deterioration, leading to cracking
[0006] The moisture-curable hot-melt adhesives of Patent Documents 1 and 2 are not intended as house interior and automobile interior materials, and it is difficult to say that the moisture-curable hot-melt adhesives have sufficiently excellent light resistance (light resistance to adhesion, yellowing and fading, etc.)

Method used

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Examples

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preparation example Construction

[0112] 6. A process for the preparation of a moisture-curable hot melt adhesive comprising the following steps (i) and (ii):

[0113] (i) the step of mixing polycarbonate polyol with cycloaliphatic isocyanate to prepare cycloaliphatic polycarbonate urethane polyol; and

[0114] (ii) A step of mixing the cycloaliphatic polycarbonate urethane polyol with an aromatic isocyanate to prepare a cycloaliphatic urethane prepolymer.

Embodiment 1 to 7 and comparative example 1 to 8

[0147] PCUO1 to PCUO'6 were mixed with other raw materials in the respective proportions shown in Tables 2 and 3 to prepare moisture curable hot melt adhesives. Specifically, all the raw materials except the isocyanate compound were charged into the reaction vessel, and the temperature was raised to 120°C, followed by stirring under reduced pressure for 1 hour. After removing moisture, an isocyanate compound was added at the same temperature, followed by stirring under reduced pressure for 2 hours, thereby obtaining a moisture-curable hot-melt adhesive. The melt viscosity of the moisture-curable hot melt adhesive was evaluated, and whether one or more terminal isocyanate groups were combined with a chemical structure derived from an aromatic ring was evaluated.

[0148]

[0149] Using a viscometer (manufactured by Brookfield Engineering Labs), the viscosity was measured. A specified amount (10.5 g) of molten moisture curable hot melt adhesive was dropped into the viscosity ...

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Abstract

The present invention discloses a moisture-curable hot-melt adhesive agent which comprises an alicyclic urethane prepolymer having isocyanate groups respectively at terminals of the alicyclic urethane prepolymer, wherein the alicyclic urethane prepolymer has a chemical structure derived from a polycarbonate polyol and at least one of the isocyanate groups located at the terminals is bound to a chemical structure derived from an aromatic ring. The adhesive agent has excellent adhesion properties (initial adhesiveness and adhesiveness after curing), light resistance (light-resistant adhesion force, yellow discoloring properties, color-fading properties, etc.) and curability (heat resistance).

Description

technical field [0001] The present invention relates to a moisture curable hot melt adhesive. More particularly, the present invention relates to a moisture-curable hot-melt adhesive that is excellent in adhesiveness, light resistance, and curability (heat resistance) and is particularly suitable for automotive interior applications. Background technique [0002] Moisture-curable hot melt adhesives are used in various fields such as building interior materials (or building materials) and electronic materials. The moisture-curable hot melt adhesive contains a urethane prepolymer having isocyanate groups at the ends. Typically, the adhesive produces an initial bond by being applied to two adherends (substrate and adherend) in a hot-melt state, cooled and hardened, and then Moisture curing by crosslinking and thus increasing the molecular weight of the urethane prepolymer improves the adhesion and curability (heat resistance) of the adhesive. [0003] Patent Document 1 discl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04
CPCC08G2170/20C08G18/42C08G18/44C08G18/10C08G18/755C08G18/757C08G18/758C08G18/7642C08G18/307C09J175/06C08G18/1833C08G18/12C08G18/724C09J175/04
Inventor 田母神刚早川正
Owner HENKEL KGAA
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