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Cationic pressure sensitive adhesive UV cured by medium mercury bulbs

A pressure-sensitive adhesive, adhesive technology, applied in the direction of film/sheet adhesives, non-polymer adhesive additives, adhesive types, etc., can solve the problem of not yet obtained adhesives, etc., Achieve improved performance, high productivity, and less waste

Inactive Publication Date: 2018-11-09
HENKEL KGAA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disclosed adhesives have not been obtained through the use of the specific acrylic monomers of the present invention

Method used

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  • Cationic pressure sensitive adhesive UV cured by medium mercury bulbs
  • Cationic pressure sensitive adhesive UV cured by medium mercury bulbs
  • Cationic pressure sensitive adhesive UV cured by medium mercury bulbs

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0127] Adhesive Coating Preparation

[0128] The adhesive was applied using a laboratory applicator with two heatable rolls. The adhesive was heated to 150°C and coated onto a 2 mil (51 μm) thick silicone-coated PET release liner. The adhesive on the liner was irradiated with a UV-C dose of 257 mJ / cm2 under H-lamps (Fusion Systems) at a line speed of 15 m / min. Then, the film was layered and transferred to a polyethylene terephthalate substrate ( DuPont) and conditioned at 23°C and 50% relative humidity. Adhesive film thickness was 3.5 mils (89 μm) unless otherwise stated.

[0129] UV curing

[0130] The adhesive film was cured using a medium pressure mercury arc lamp (using an IST UV curing laboratory unit). Use the EIT PowerPuck to measure and record the UV C dose. UV-C is the 200-280nm region.

[0131] Measurement methods:

[0132] AFERA ​​4001 (measurement of adhesion (peel) according to DIN EN ISO 11339:2010-06)

[0133] AFERA ​​4012 (measured by cohesion (shear)...

Embodiment 1

[0146] Example 1 (comparative): Standard example using an acrylic polymer containing 2-ethylhexyl acrylate.

[0147] Preparation of UV-curable polymers:

[0148] A four-neck 1 L round bottom polymerization flask was equipped with a thermometer connected to a temperature control unit, a condenser, an overhead mechanical stirrer, two addition funnels, and nitrogen inlet / outlet. The apparatus was purged with nitrogen for 15 minutes. A mixture of the following monomers was prepared: 2-ethylhexyl acrylate (2-EHA, 99.8 g), methyl acrylate (MA, 96.2 g), 1-acryloylmethyl-3,4-cyclohexene epoxide (M100, 1.0g). Into a funnel was added 160 g of the monomer mixture. Into another funnel was added the initiator 2,2'-azobis-(2-methylpropionitrile) (AIBN, 0.5 g) and ethyl acetate (60 mL). The remaining monomer mixture (40 g), initiator AIBN (0.27 g) and ethyl acetate (100 mL) were added to the polymerization flask. The mixture was heated to vigorous reflux (76-80°C) for 15 minutes. The m...

Embodiment 2

[0153] Example 2: An example of using only butyl acrylate and methyl acrylate in the acrylic polymer.

[0154] Preparation of UV-curable polymer: Same as the polymer prepared in Example 1, except that butyl acrylate was used instead of 2-ethylhexyl acrylate. The properties of this polymer can be seen in Table 2 below. Most important are the ball rolling values ​​for two different curing conditions: at 20mJ UV-C: 20cm and 21cm on both sides. At the higher cure doses: 26cm and 28cm, there was no significant difference.

[0155] Table 2: Performance measurements of tackifying polymers using only butyl and methyl acrylate

[0156]

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Abstract

The present invention relates to an UV-curable pressure sensitive acrylic adhesive obtainable by reacting in a first step a mixture comprising: (i) at least one acrylic monomer of formula (I) whereinR1 is H or CH3; and wherein R2 and R3 are both H or both CH3; and n is an integer from 0 to 22; or mixtures thereof; and (ii) at least one monomer which comprises a pendant reactive functional group selected from cycloaliphatic epoxides, oxetanes, mono-substituted oxiranes or mixtures thereof; and in a second step reacting the obtained mixture from the first step with (iii) at least one cationic photoinitiator; and (iv) optionally further additives. An article comprising this adhesive, and a method of manufacturing the article are also related.

Description

technical field [0001] The present invention relates to UV-curable pressure-sensitive acrylic adhesives (hereinafter also referred to as HMPSAs) obtainable by combining, in a first step, specific acrylic monomers with at least one Reaction of monomers comprising side chain reactive functional groups selected from the group consisting of cycloaliphatic epoxides, oxetanes, monosubstituted oxiranes or combinations thereof mixture, and then react the obtained mixture with at least one cationic photoinitiator and optionally other components. Background technique [0002] Pressure sensitive adhesives (PSAs) are permanently tacky at room temperature and adhere to surfaces by applying light finger pressure. PSA compositions are commonly applied to various substrates, such as paper, fabric, metal and plastic films, and then turned into a large number of different products, especially pressure sensitive adhesive tapes, medical tapes and labels. These pressure-sensitive adhesive prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/18C09J7/38C09J133/14
CPCC09J133/14C09J2203/334C09J2433/00C09J7/385C09J2301/416C08F220/1804C08F220/1808C08K5/36C08F220/14C08F220/32C09J11/06C09J133/00C09J2301/302C08K5/45C08L63/00C09J133/10
Inventor J·范赫伦T·罗什科夫斯基
Owner HENKEL KGAA
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