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Method for stabilizing polyacrylate pressure-sensitive adhesives in admixture with adhesive resins

A pressure-sensitive adhesive, polyacrylate technology, applied in the direction of adhesives, adhesive types, acidic copolymer adhesives, etc., can solve the problems of tackifier resin oxidative damage, no implementation, browning, etc.

Inactive Publication Date: 2012-09-12
TESA SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, all these tackifier resins have the disadvantage that the resins exhibit a more or less intrinsic color, which means that the addition of these resins to transparent, clear and completely colorless pressure-sensitive adhesives leads to discoloration of the pressure-sensitive adhesive, And lose the colorless and transparent properties of polyacrylate pressure-sensitive adhesives
This thermal load leads to oxidative damage of the added tackifier resin, which, depending on the tackifier resin used, manifests itself as browning of the resin and thus of the resin-blended polyacrylate PSA
[0012] The use of thioalkyl-substituted cresol derivative-type aging inhibitors for resin-blended polyacrylate PSAs to stabilize compound color has hitherto not been practiced in the art

Method used

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  • Method for stabilizing polyacrylate pressure-sensitive adhesives in admixture with adhesive resins
  • Method for stabilizing polyacrylate pressure-sensitive adhesives in admixture with adhesive resins
  • Method for stabilizing polyacrylate pressure-sensitive adhesives in admixture with adhesive resins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] A polyacrylate PSA prepared by free radical polymerization in 60 / 95 benzine spirit based on 48.5 mol% acrylic acid was compounded with about 30% by weight of terpene phenolic resin TP95 from Arizona. The copolymer composition of 2-ethylhexyl ester, 48.5mol% butyl acrylate, 1mol% acrylic acid and 2mol% glycidyl methacrylate, weight average molecular weight (M w ) is about 1.5×10 6 g / mol. The compound was subsequently mixed with a 2% by weight solution of Irganox 1726 in 60 / 95 petrolatum. The mixture was then homogenized on a roller table for 24 hours.

[0068] The resulting resin-blended polyacrylate PSA was coated onto etched PET film at a coating weight of 50 g / m using a coating knife in a laboratory coating unit 2 .

[0069] The coated material was dried at room temperature for 24 hours and color measurements were taken as a reference.

[0070] The reference material was then heat-treated at 150°C for 3 hours in a forced-air drying oven.

[0071] The color and g...

Embodiment 2

[0082] A polyacrylate PSA prepared by free-radical polymerization in 60 / 95 petrolatum based on 48.5 mol% 2-ethyl acrylic acid was compounded with about 30 wt. The copolymer composition of hexyl hexyl ester, 48.5mol% butyl acrylate, 1mol% acrylic acid and 2mol% glycidyl methacrylate, weight average molecular weight (M w ) is about 1.5×10 6 g / mol. The compound was subsequently mixed with a mixture of 1% by weight of Irganox 1726 and 1% by weight of Irgafos 168 in 60 / 95 petrolatum. The mixture was then homogenized on a roller table for 24 hours.

[0083] The resulting resin-blended polyacrylate PSA was coated onto etched PET film at a coating weight of 50 g / m using a coating knife in a laboratory coating unit 2 .

[0084] The coated material was dried at room temperature for 24 hours and color measurements were taken as a reference.

[0085] The reference material was then heat-treated at 150°C for 3 hours in a forced-air drying oven.

[0086] The color and gloss of differe...

Embodiment 3

[0097] A polyacrylate PSA prepared by free-radical polymerization in 60 / 95 petrolatum was compounded with about 30% by weight of the terpene phenolic resin TP95 from Arizona and was composed of The copolymer composition of hexyl hexyl ester, 48.5mol% butyl acrylate, 1mol% acrylic acid and 2mol% glycidyl methacrylate, weight average molecular weight (M w ) is about 1.5×10 6 g / mol. The compound was then mixed with a mixture of 1% by weight of Irganox 1726 and 1% by weight of a solution of Tinuvin 765 in 60 / 95 petrolatum. The mixture was then homogenized on a roller table for 24 hours.

[0098]The resulting resin-blended polyacrylate PSA was coated onto etched PET film at a coating weight of 50 g / m using a coating knife in a laboratory coating unit 2 .

[0099] The coated material was dried at room temperature for 24 hours and color measurements were taken as a reference.

[0100] The reference material was then heat-treated at 150°C for 3 hours in a forced-air drying oven. ...

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Abstract

The invention relates to polyacrylate-based pressure-sensitive adhesives, containing at least one resin and at least one ortho, meta or para-cresol derivative, the aromatic ring thereof being substituted on at least two carbon atoms, wherein the substitutes are derivatives of thiols and / or thioethers. The invention further relates to adhesive tapes comprising at least one layer of said pressure-sensitive adhesive and to the use of said cresol derivatives as an antioxidant for polyacrylate pressure-sensitive adhesives.

Description

technical field [0001] This invention relates to a method of stabilizing polyacrylate pressure sensitive adhesives mixed with tackifier resins. Background technique [0002] Acrylate-based polyacrylates with defined ester pendant chain lengths exhibit pressure-sensitive adhesive properties. If the length of the pendant ester groups exceeds a certain level, pressure sensitive adhesive properties are lost due to crystallization of the copolymer. [0003] Polyacrylates exhibit a broad profile of properties compared to other conventional scaffold polymers for pressure sensitive adhesives. Polyacrylate scaffold polymers have no double bonds ("saturated systems") and are therefore very stable against aging processes. It is transparent, colorless and has proven to be very stable (even on exposure to UV light). Due to these circumstances, it is also not necessary to add aging inhibitors or light stabilizer packages to polyacrylates, in contrast to eg natural rubber-based or styre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/13C08K5/37C09J133/00
CPCC08K5/13C08K5/375C09J133/02C09J133/068Y10T428/2848Y10T428/273Y10T428/2891C08F220/1807C08F220/1804C08F220/06C08F220/325C08F220/14C08F220/281C09J133/00C08K5/37
Inventor M.斯皮斯B.利曼
Owner TESA SE
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