Method for producing cohesive polyacrylate adhesive compounds with a narrow molar mass distribution

A technology of acrylate and polymer, applied in the field of molecular weight of polyacrylate

Active Publication Date: 2014-09-10
TESA SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High concentrations of cross-linking agents increase the risk of gelation during hotmelt, and / or risk of over-crosslinking

Method used

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  • Method for producing cohesive polyacrylate adhesive compounds with a narrow molar mass distribution
  • Method for producing cohesive polyacrylate adhesive compounds with a narrow molar mass distribution
  • Method for producing cohesive polyacrylate adhesive compounds with a narrow molar mass distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0142]

[0143] The following test methods were used in order to evaluate the process adhesion properties and general properties of the prepared PSAs.

[0144] ESI-MS measurement (test A)

[0145] Mass spectra were recorded on an LXQ mass spectrometer (ThermoFisher Scientific, San Jose, CA, USA) equipped with an atmospheric pressure ionization source in nebulizer-assisted electrospray mode. The instrument was calibrated in the range 195-1822 m / z using standard volumes of caffeine, Met-Arg-Phe-Ala acetate (MRFA), and a mixture of fluorinated phosphazenes (Ultramark 1621) (all from Sigma-Aldrich) . A constant spray voltage of 3.5 kV and a dimensionless purge gas flow rate of 8 and a carrier gas flow rate of 2 were set. Capillary voltage, lens voltage, and capillary temperature were 60V, 120V, and 275°C.

[0146] Gel Permeation Chromatography GPC (Test B)

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Abstract

The invention relates to a method for producing polyacrylate adhesive compounds with a narrow molar mass distribution by means of a radical polymerization and a subsequent increase of the molar masses by reacting with bis- or multi-dienyl compounds, in particular with alpha, omega-bis-dienyl compounds, in order to increase the cohesion in particular.

Description

technical field [0001] The present invention relates to a process for increasing the molecular weight of polyacrylates with a narrow molar mass distribution. Background technique [0002] Industrial tape applications very frequently use pressure sensitive polyacrylate adhesives. Polyacrylates have several advantages over other elastomers. They are highly stable to UV light, oxygen, and ozone. Synthetic and natural rubber adhesives often contain double bonds, which can render these adhesives unstable to the aforementioned environmental influences. Another advantage of polyacrylates is their transparency and their ability to be used over a relatively wide temperature range. [0003] Pressure-sensitive polyacrylate adhesives are usually prepared in solution by free-radical polymerization. In general, the polyacrylate in solution is applied to the carrier material concerned with a coating rod and then dried. To increase cohesion, the polymer is usually crosslinked. Curing ...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08F220/18C09J133/14C08F2/38
CPCC08F2/38C09J133/08C08F2438/03C08F220/18C08F220/1804C08F220/1808C08F220/06C08J3/24C08K5/5317C08K5/378C09J133/14
Inventor A.普伦泽尔
Owner TESA SE
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