Adhesive containing block copolymer

一种嵌段共聚物、粘合剂的技术，应用在胶粘剂等方向，能够解决失去粘合性、无法使用等问题，达到优异粘合性能、粘合性优异、透明性优异的效果

Active Publication Date: 2016-01-06
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the adhesive is a reactive adhesive, it will react with the adherend after it is pasted on the adherend, lose its adhesiveness after the reaction, and cannot be used on tapes, labels, etc. that will be peeled off. Use in the use of adhesive products (use as an adhesive)

Method used

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  • Adhesive containing block copolymer
  • Adhesive containing block copolymer
  • Adhesive containing block copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8、 comparative example 1～8

[0279] The block copolymers (I-1) to (I-5) and (C-1) to (C-7) synthesized in the above synthesis examples 1 to 12 and a tackifying resin (manufactured by Arakawa Chemical Industry Co., Ltd., PINECRYSTALKE- 311) and a plasticizer (manufactured by Toagosei Co., Ltd., ARUFONUP 1000) were dissolved in toluene at the mass ratio shown in Table 3 below to prepare a 35% by mass toluene solution. This was coated on a film made of polyethylene terephthalate (Toyobo Ester Film E5000, thickness 50 μm) using a coater so that the thickness of the adhesive layer after drying was 25 μm, and then the The film was dried at 60° C. for 30 minutes and heat-treated to form an adhesive tape. In the evaluation of the produced pressure-sensitive adhesive tape, when sticking to an adherend, a 2 kg roller was made to reciprocate twice at a speed of 10 mm / sec, and sticking was performed for evaluation.

[0280] About the obtained pressure-sensitive adhesive tape, various physical properties were evaluat...

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Abstract

Provided are: an acrylic-based hot-melt adhesive that is superior in terms of both hot-melt coating characteristics and holding strength, is favorable for application in hot-melt coating methods that coat at a high speed at low temperatures, has superior transparency and weather resistance, and furthermore has superior adhesion at low temperatures; and a block copolymer favorable for use with respect to same. The present invention produces an adhesive containing a block copolymer having at least one structure represented by the general formula -[A1]-[B / A2]- (wherein: [A1] indicates a polymer block comprising a structural unit derived from a methacrylic ester (A1); [B / A2] indicates a copolymer block comprising a structural unit derived from an acrylic ester (B) and a structural unit derived from a methacrylic ester (A2); and the copolymer block [B / A2] has a gradient copolymer block section at which the copolymer ratio of the methacrylic ester (A2) continues to increase from the section of bonding to the copolymer block [A1]), having a total content of structural units derived from the methacrylic ester (A1) and the methacrylic ester (A2) of 5-60 mass%, having a weight average molecular weight (Mw) of 30,000-300,000, and having a molecular weight distribution (Mw / Mn) of 1.0-1.5.

Description

technical field [0001] The present invention relates to an adhesive. Specifically, the present invention relates to an adhesive containing a block copolymer having a specific gradient copolymer block. The adhesive of the present invention has excellent melt processability, high holding power, and good viscosity and wettability, so it is particularly suitable as a hot-melt adhesive. Background technique [0002] Compared with rubber-based adhesives, acrylic adhesives are widely used in optical films, protective films, labels, medical tapes, industrial Adhesive products such as tapes. In general, acrylic adhesives are mainly classified into solution adhesives, emulsion adhesives, and hot melt adhesives according to their form. In addition, in recent years, UV-curable adhesives have been developed that react by irradiating UV light after coating. [0003] In this specification, "adhesive" means "pressure-sensitive adhesive". Here, the "pressure-sensitive adhesive" refers t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J153/00C08F297/02
CPCC08F4/52C08F297/026C09J153/00C08F220/14C08F220/1804C08F293/005
Inventor 中田加那予森下义弘
Owner KURARAY CO LTD
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