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Reversible covalent crosslinking method for adhesives

A technology of adhesives and preparations, applied in the direction of adhesive types, ester copolymer adhesives, acidic copolymer adhesives, etc., which can solve problems such as low adhesion

Active Publication Date: 2017-06-30
TESA SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of such tapes is therefore limited to applications requiring only low adhesion

Method used

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  • Reversible covalent crosslinking method for adhesives
  • Reversible covalent crosslinking method for adhesives
  • Reversible covalent crosslinking method for adhesives

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0103] Preparation of base polymer Ac1

[0104] A reactor conventional for free radical polymerization was charged with 30.0 kg of 2-ethylhexyl acrylate, 67.0 kg of butyl acrylate, 3.0 kg of acrylic acid and 66.7 kg of acetone / isopropanol (96:4). After nitrogen had been passed through the reactor for 45 minutes, the reactor was heated to 58° C. with stirring and 50 g of Vazo 67 in a solution of 500 g of acetone were added. The external heating bath was then heated to 70°C and the reaction was carried out constantly at this external temperature. After 1 hour, an additional 50 g of Vazo 67 was added as a solution in 500 g of acetone, and after 2 hours the batch was washed with 10 kg of acetone / isopropanol mixture (96:4 ) for dilution. After 5.5 hours, add 150 g of bis(4-tert-butylcyclohexyl)peroxydicarbonate (in the form of a solution in 500 g of acetone); after 6 hours and 30 minutes, add 10 kg of acetone / isopropanol The mixture (96:4) was diluted again. After 7 hours, anot...

Embodiment

[0110] Preparation of pressure sensitive adhesives PSA1 to PSA6

[0111] Table 2: Adhesive specific data

[0112]

[0113] 0.47 wt% of T3P corresponds to 3.5 mol%, based on the acrylic acid fraction of the polymer.

[0114] The base polymer in solution is in each case admixed with a 3% solution of a coupling agent or crosslinker in isopropanol, diluted to a solids content of 30% with isopropanol, and then coated from the solution. Coated onto siliconized (siliconised) barrier film (50μm polyester) (coating speed: 2.5m / min, drying tunnel: 15m, temperature zone 1: 40°C, zone 2: 70°C, zone 3: 95°C, zone 4 : 105°C). The coating weight is in each case 50 g / m 2 .

[0115] Table 3: Adhesive performance results

[0116]

[0117] In order to evaluate the reversibility of the crosslinking, the bonded adhesive was subjected to a climatic cycle test (changes in atmospheric humidity and temperature) on the one hand and briefly treated with an acetic acid solution (approximately ...

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Abstract

The present invention relates to methods of thermal crosslinking of adhesives and to products produced with these adhesives. It is an object of the present invention to provide a method for thermal crosslinking of adhesives, wherein the crosslinking (initiated by chemical or physical stimuli) is covalent and reversible. When desired, the cross-linking method can also be configured to produce covalent, irreversible networks.

Description

technical field [0001] This invention relates to a process for the thermal crosslinking of adhesives and to the products produced with these adhesives. Background technique [0002] It has long been known that for adhesives, more particularly for acrylate adhesives, crosslinking is necessary in order to produce outstanding adhesive properties. With rubber, crosslinking also produces improvements in adhesive properties. [0003] In order to ensure sufficient stability of the adhesive against high temperatures, solvents and other influences, the following methods are mainly preferred: eg chemical / thermal crosslinking methods such as lead to the formation of covalent crosslinks and methods involving UV radiation or electron beams. [0004] The adhesive produced by the above-mentioned method is usually irreversibly cross-linked, thereby restricting the use of the adhesive tape produced by this adhesive in specific applications, for example, restricting the re-separation ability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J11/06C09J133/08
CPCC08K5/5317C09J9/00C09J11/06C09J2433/00C08G18/6254C09J175/04C09J2301/302C09J11/00C09J201/00C07F9/657172C08F8/40C08F16/02C08F20/06C08F2810/20C09J133/02
Inventor A.普伦泽尔S.巴姆伯格
Owner TESA SE