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Thermally reversible cross-linked hot-melt adhesive

A hot-melt adhesive, reversible technology, used in adhesives, polyurea/polyurethane adhesives, non-polymer adhesive additives, etc., can solve problems such as poor pot life, increased viscosity, and short pot life. , to achieve the effect of excellent high-speed coating adaptability, excellent binding strength, and high adhesion

Inactive Publication Date: 2020-05-22
TAIYO SEIKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The characteristics of this PUR include: one-component property, instant setting properties, high adhesive force, and excellent heat resistance. As the problems, it is necessary to be airtight during storage, the pot life is short, and it reacts with moisture. PUR cannot be reused and cannot be reused
In addition, in the case of PUR, there is a problem that the residual diisocyanate monomer is generated in the form of gas during heating and melting, and the cleaning frequency of the adhesive coating device is high.
[0010] However, although the thermally reversible hot-melt adhesive described in this Patent Document 1 can be repeatedly heated and cooled without adversely affecting the performance of the adhesive, there are problems such as an increase in viscosity due to the passage of time, The problem of bad shelf life

Method used

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  • Thermally reversible cross-linked hot-melt adhesive
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  • Thermally reversible cross-linked hot-melt adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] Embodiment 1: Preparation of hot melt adhesive composition

[0109] Polyesterdiol (SA / HD3500, molecular weight 3500) formed from sebacic acid and hexanediol and having hydroxyl groups at both ends, polyesterdiol formed from sebacic acid and hexanediol and having hydroxyl groups at both ends ( SA / HD2000, molecular weight 2000), and polyester diol (AA / HD / NPG2000, molecular weight 2000) formed from adipic acid, hexanediol and neopentyl glycol and having hydroxyl groups at both ends were put into the reaction tank, and Melt mixing was performed at 90°C.

[0110] The antioxidant and antifoaming agent described in Table 1 were mixed with the said polyester diol which melt-mixed. After the temperature was raised, the pressure was reduced to 5 Torr, and stirring was performed under reduced pressure for 3 hours to dehydrate the raw material.

[0111] The reaction tank was returned to atmospheric pressure with nitrogen, and 4,4'-diphenylmethane diisocyanate was added under a ni...

Embodiment 2～11

[0125] Adhesive compositions of various formulations were prepared in the same manner as in Example 1. Table 1 shows details of the compositions of Examples 2 to 11.

[0126] In addition, the molecular weight distribution based on the gel permeation chromatography (GPC) was measured about the hot-melt adhesive composition of the present invention of Examples 1-11 described in the following Table 1, and these are number average molecular weight (Mn ) = about 8000 to 15000 (weight average molecular weight (Mw) = about 16000 to 30000). Then, calculate the average value of the molecular weight of the diols according to the molecular weight and the number of moles of the diols compounded in each embodiment, calculate the a , The value of b and find its average value. At this time, in Examples 1 to 11, trimethylolpropane was used as a multi-branched compound having three or more branches having a hydroxyl group at the terminal, so m=3 was used for calculation.

[0127] As a resul...

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Abstract

Provided is a thermally reversible cross-linked hot-melt adhesive which has good handling properties and storage stability, can be repeatedly melted by heating and solidified by cooling, and has highadhesiveness and good pot life. This hot-melt adhesive is obtained by melting and mixing a maleimide compound, having a maleimide group at a plurality of ends thereof, with a mixture of a star-branched-structure polyurethane resin having a furan ring at a plurality of ends thereof and a straight-chain polyurethane resin having a furan ring at both ends thereof. The hot-melt adhesive has, due to athermally reversible equilibrium reaction, a low viscosity when being melted by heating, and, after being solidified by cooling, forms a high molecular weight body having a three-dimensionally cross-linked structure, and therefore, is a resin having high cohesive force and high adhesiveness. The hot-melt adhesive does not react with moisture in the air and therefore can be stored in air, and is particularly suitable as a hot-melt adhesive for bookbinding.

Description

technical field [0001] The present invention relates to a thermally reversible cross-linking hot-melt adhesive, in particular to a thermally reversible cross-linking hot-melt adhesive suitable for bookbinding. Background technique [0002] Generally, there are two types of hot-melt adhesives used for bookbinding, and the characteristics and problems of each are as follows. [0003] 1) EVA hot melt adhesive [0004] It is a hot-melt adhesive with ethylene vinyl acetate copolymer resin (EVA) as the base resin, and the adhesive force is obtained by agglomerating and solidifying the heated and melted adhesive at room temperature. [0005] As the feature of this hot-melt adhesive, can enumerate: be one liquid property, have instant setting property, can store in the air, can reuse, and pot life (the adhesive agent in the adhesive agent coating device usable time) is long. On the other hand, as a problem of this hot-melt adhesive, since only the cohesive force of resin contribu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J11/06
CPCC08G18/282C08G18/3206C08G18/4202C08G18/4216C08G18/4238C08G18/73C08G18/7671C08G2170/20C09J175/06C09J11/06
Inventor 小林宪司木下典彦
Owner TAIYO SEIKI CO LTD
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