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OCA adhesive tape applied to folding mobile phone

A technology for folding mobile phones and tapes, applied in the field of flexible materials, can solve problems such as easy fracture or delamination, and large modulus, and achieve the effect of reducing the risk of fracture or delamination, low modulus, and improving crystallinity

Pending Publication Date: 2022-06-03
安徽晶华新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the folding requirements, the adhesive tape for connecting the internal parts of the mobile phone needs to be matched with flexible and repeatable folding. The existing OCA adhesive modulus is relatively large, and the stress concentration area at the bend is prone to breakage or delamination.

Method used

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  • OCA adhesive tape applied to folding mobile phone
  • OCA adhesive tape applied to folding mobile phone
  • OCA adhesive tape applied to folding mobile phone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Synthetic OCA glue

[0020] 20wt% monomer (mass ratio 1:2:3:4 butyl acrylate, ethyl acrylate, 2-ethylhexyl methacrylate, lauryl acrylate), 0.1wt% initiator benzoyl peroxide , and the remaining amount of toluene was added to the reaction kettle, and polymerized at 70° C. for 6 hours to obtain an acrylate-based copolymer. Based on this acrylate copolymer, it is measured as 25wt% of the raw material of the OCA adhesive layer, and then 55wt% of diluent solvent ethyl acetate and the balance of toluene are added to adjust to a reasonable viscosity of 5000-6000cps, that is, OCA glue is obtained to prepare OCA adhesive tape

[0021] Select a 75μm release layer with a suitable release force (15-100g), apply the OCA glue (dry glue thickness) prepared by 75μm through a slit or a doctor blade, and then heat it in an oven. The 50μm plane release film with the force (3-50g) produces the finished OCA tape without substrate.

Embodiment 2

[0023] Synthetic OCA glue

[0024] 30wt% monomer (mass ratio 1:1:1 of 2-ethylhexyl methacrylate, lauryl acrylate, methacrylic acid), 1t% initiator benzoyl peroxide, and the balance of toluene were added to the reaction The kettle was polymerized at 72°C for 6 hours to obtain an acrylate-based copolymer. Based on this acrylate copolymer, it is measured to account for 35wt% of the raw material of the OCA adhesive layer, then add diluting solvent 30-55wt% ethyl acetate and the balance of toluene, adjust to a reasonable viscosity of 5000-6000cps, that is, obtain OCA glue

[0025] Preparing OCA Tape

[0026] Select a 100μm release layer with a suitable release force (15-100g), apply it through a slit or a doctor blade, and directly apply the OCA glue (dry glue thickness) prepared by 65μm. The 55μm plane release film with the force (3-50g) produces the finished OCA tape without substrate.

Embodiment 3

[0028] Synthetic OCA glue

[0029] 40wt% of monomer 2-ethylhexyl methacrylate, 2wt% of initiator dicumyl peroxide, and balance of toluene were added to the reaction kettle, and polymerized at 74° C. for 6 hours to obtain an acrylate copolymer. Based on this acrylate copolymer, it is measured as 45wt% of the raw material of the OCA adhesive layer, and then 40wt% of diluent solvent ethyl acetate and the balance of toluene are added to adjust to a reasonable viscosity of 5000-6000cps, that is, OCA glue is obtained to prepare OCA adhesive tape

[0030] Select an 85m release layer with a suitable release force (15-100g), apply it through a slit or a scraper, and directly apply the OCA glue (dry glue thickness) prepared by 33μm. A 65μm flat release film with a force (3-50g) is used to produce a finished OCA tape without a substrate.

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Abstract

The invention discloses an OCA adhesive tape applied to a folding mobile phone, the OCA adhesive tape comprises a release layer, an OCA adhesive layer and a planar release film which are arranged in sequence, and the OCA adhesive layer comprises the following raw materials in percentage by weight: 25-50% of acrylate copolymer, 30-55% of ethyl acetate and the balance of toluene. The composition and the structure of the OCA adhesive tape are optimally designed, so that the flexibility and the fitting performance of a product are effectively improved, and the requirement of long-term use of a folding screen is fully met.

Description

technical field [0001] The present invention relates to flexible material technology, in particular to an OCA tape applied to a foldable mobile phone. Background technique [0002] With the development of science and technology and new market demands, flexible and foldable smartphones were launched at the 2019 Mobile World Congress. In order to meet the needs of current consumers seeking portability and a variety of functions, major mobile phone manufacturers are committed to researching foldable smartphones. In order to meet the folding requirements, the link tape of the internal parts of the mobile phone needs to be matched with flexibility and can be folded repeatedly. The existing OCA adhesive has a relatively large modulus, and the stress concentration area at the bend is prone to fracture or delamination. [0003] The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not be ta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/30C09J7/40C09J133/08C09J133/10C08F120/18C08F220/06C08F220/18
CPCC09J7/30C09J7/40C09J133/08C09J133/064C09J133/10C08F220/1812C08F220/1808C08F220/06C08F120/18C09J2203/326C08F220/1802C08F220/1804
Inventor 胡东超郭啸风郑章勤周晓南
Owner 安徽晶华新材料科技有限公司
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