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A UV debonding pressure-sensitive adhesive composition and pressure-sensitive tape suitable for porous substrates

A technology of pressure-sensitive adhesives and compositions, applied in the field of pressure-sensitive adhesives, can solve problems such as difficult to clean and glue residue

Active Publication Date: 2021-11-26
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing debonding adhesive composition due to its glue formulation limitation, when used on porous surfaces, the debonding UV oligomers will migrate into the micropores
After UV debonding, the glue will further remain on the surface, making it difficult to remove

Method used

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  • A UV debonding pressure-sensitive adhesive composition and pressure-sensitive tape suitable for porous substrates
  • A UV debonding pressure-sensitive adhesive composition and pressure-sensitive tape suitable for porous substrates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] First, synthesize an acrylic pressure-sensitive adhesive with epoxy functional groups. Add butyl acrylate, methyl acrylate, acrylic acid and glycidyl methacrylate (ratio: 60:30:5:5) into the reaction kettle, and use toluene as a solvent. , add benzoyl peroxide (BPO) as an initiator, react at 70°C for 24h and discharge. Add a polyurethane oligomer (6145-100 from Changxing Chemical) to the obtained pressure-sensitive adhesive, and then add a bridging agent diallylamine and a photoinitiator. The specific ratio is shown in the following table. In the tables below, weight percentages are based on the total amount of components excluding solvent.

[0050] Among them, the photoinitiator is photoinitiator 184. The viscosity of 6145-100 at 25°C is 70000mPa·s, and its glass transition temperature after ultraviolet light crosslinking is 104°C.

[0051] Coat the glue on the polypropylene (PP) film and dry it to get the UV debonding protective tape. The tape is pasted on the surfa...

Embodiment 2

[0054] First synthesize the acrylic pressure-sensitive adhesive with epoxy functional group, add 2-ethyl ethyl acrylate, methyl acrylate, acrylic acid and glycidyl acrylate (ratio 55:35:7:3) into the reaction kettle to Toluene is used as a solvent, BPO is added as an initiator, and the reaction is carried out at 70°C for 24 hours. Add polyurethane oligomer (Sartomer CN8000NS, USA) to the obtained pressure-sensitive adhesive, and then add bridging agent allylamine and photoinitiator. The specific ratio is shown in the following table.

[0055] Among them, the photoinitiator is TPO. The viscosity of CN8000NS at 25°C is 14000mPa·s, and its glass transition temperature after UV crosslinking is 65°C.

[0056] Coat the glue on the PP film and dry it to get the UV debonding protective tape. The tape is pasted on the surface of anodized aluminum with an initial adhesive force of 0.4N / mm. After UV irradiation, the viscosity is reduced to 0.01N / mm. After the tape is removed, there is ...

Embodiment 3

[0059] First synthesize acrylic pressure-sensitive adhesive with epoxy functional group, 2-ethyl ethyl acrylate, methyl methacrylate, hydroxyethyl acrylate and glycidyl methacrylate (ratio 60:26:10:4 ) into the reactor, using toluene as the solvent, adding BPO as the initiator, reacting at 70°C for 24h and discharging. Add a polyurethane oligomer (6145-100 from Changxing Chemical) to the obtained pressure-sensitive adhesive, and then add a bridging agent diallylamine and a photoinitiator. The specific ratio is shown in the following table.

[0060] Among them, the photoinitiator is TPO. The viscosity of 6145-100 at 25°C is 70,000mPa·s, and its glass transition temperature after UV crosslinking is 104°C.

[0061] Coat the glue on the PP film and dry it to get the UV debonding protective tape. The tape is pasted on the surface of anodized aluminum with an initial adhesive force of 0.6N / mm. After UV irradiation, the viscosity is reduced to 0.01N / mm. After the tape is removed, t...

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Abstract

The invention provides a UV debonding pressure-sensitive adhesive composition and an adhesive tape comprising the same. The UV debonding pressure-sensitive adhesive composition comprises a polyacrylate pressure-sensitive adhesive, a UV-polymerizable polyurethane oligomer, a bridging agent and a free radical photoinitiator, wherein the polymerization monomer of the polyacrylate pressure-sensitive adhesive contains Epoxy functional acrylic monomer. The UV debonding pressure-sensitive adhesive composition greatly reduces its adhesive force after being irradiated with ultraviolet light, and when used on a microporous surface, there is no residual glue in the micropore.

Description

technical field [0001] The invention relates to the field of pressure-sensitive adhesives, in particular to a UV debonding pressure-sensitive adhesive composition and a pressure-sensitive adhesive tape comprising the same. Background technique [0002] Porous ceramic materials, including anodized aluminum, are increasingly used in cosmetic parts in the consumer electronics industry. During the processing of porous materials, it is necessary to temporarily protect them with protective films such as adhesive tape. [0003] There are a large number of nano-scale pores distributed on the surface of the anodized aluminum used for the back shell of the mobile phone. Common protective film tapes have poor adhesion to porous surfaces and tend to fall off when the back cover is processed by computer numerical control (CNC) and cannot provide sufficient protection. For high-viscosity protective films, the adhesive layer is easy to penetrate into the micropores, and residual adhesive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/38C09J133/08C09J175/14C09J7/26
CPCC09J133/068C09J175/14C09J2423/106C09J2433/00C09J2475/00C09J7/26C09J7/385C08L75/14
Inventor 杨超崔伟
Owner 3M INNOVATIVE PROPERTIES CO