Ultraviolet (UV) adhesive tape and preparation method thereof

Abstract

The invention relates to the technical field of wafer dicing adhesive glue, and particularly relates to an ultraviolet (UV) adhesive tape and a preparation method thereof. The UV adhesive tape comprises a PET (polyethylene terephthalate) released protective film, an UV (Ultraviolet) glue layer and a PVC (Polyvinyl Chloride) film which are sequentially stacked up and down; the UV glue layer is prepared from the following components in parts by mass: 50 to 100 parts of acrylic resin with a vitrified temperature of minus 20 to minus 30 DEG C, 0 to 5 parts of epoxy resin cross-linking agents, 0 to50 parts of carbon-carbon double-bond multi-element unsaturated resin and 0 to 10 parts of photoinitiator mixed liquid. According to the UV adhesive tape disclosed by the invention, the defect that aglue layer is too soft or too hard can be improved, adhesion and separation of glue residues formed in the back side of a wafer and an iron ring can be avoided, and the adhesion reduction effect of the adhesive tape also can be greatly improved so as to ensure that a picking rate is 100 percent; by utilizing polycondensation reaction on the epoxy resin cross-linking agents and the acrylic resin,glue materials are cross-linked in a net manner, and a hydroxyl functional group is produced, so that Van der Wals force between the hydroxyl functional group and a PVC film is greatly improved, and adhesive power and cohesion force are greatly enhanced; meanwhile, the UV adhesive tape has the characteristics of low cost, less pollution and the like.

Description

technical field [0001] The invention relates to the technical field of wafer cutting adhesives, in particular to a UV adhesive tape and a preparation method thereof. Background technique [0002] In the prior art, all the UV tapes used in China come from Japan. Its structure mainly includes PVC film, UV adhesive layer, and PET release protective film. When using, the release protective film is torn off and pasted on the back of the wafer. After the processing is completed, the adhesive force of the UV adhesive layer in the tape is rapidly reduced to almost zero through ultraviolet radiation from the direction of PVC, so that it is easy to pick. [0003] At present, the current situation of UV adhesive layer used in most domestic products is mainly reflected in the following points: [0004] 1) The domestic use of acrylic resin is not appropriate, so that the adhesion effect is poor, the adhesion and cohesion are insufficient, and it is prone to flying crystals and residual ...

AI Technical Summary

Problems solved by technology

[0004] 1) The domestic use of acrylic resin is not appropriate, so that the adhesion effect is poor, the adhesion and cohesion are insufficient, and it is prone to flying crystals and residual glue;

[0005] 2) In China, unsaturated resins with 3 carbon-carbon double bonds are mostly used, and the adhesive tape has poor viscosity reduction; after ultraviolet irradiation, the adhesive force is about 50g / 20mm, which is completely impossible to pick

[0006] 3) In addition, mostly trifunctional isocyanate crosslinking agents are used in China. After reacting with acrylic resin, the crosslinking degree of this crosslinking agent is relatively low, and the cohesion is relatively low, which is prone to residual glue

[0007] 4) A single photoinitiator is mostly used in China, and the tape’s viscosity reduction is poor; for example, 1-benzoylcyclohexanol is mostly used in China, and the UV adhesive layer is greatly affected by the shielding of the PVC film, so that the effect of reducing the adhesion is greatly affected. impact, totally impossible to pick

[0008] In addition, when the manufacturer introduces Japanese UV tape for production and processing, it still adopts the traditional technical solution. The specific implementation process of the technical solution is as follows: the first step is to apply a layer of treatment agent with a thickness of about 3μ on the PVC film and dry it in an oven. ; The second step, coating the pre-prepared UV adhesive layer on the PET release protective film, and then drying in an oven; the third step, coating the bonded UV adhesive layer, PET release protective film It is integrated with PVC film by pressing rollers to form a UV tape product; this traditional solution is to increase the adhesion between the UV adhesive layer and the PVC film and improve the quality of the UV tape product. A treatment agent coating process is added to the PVC film. , virtually increases the production and processing costs of the product, and more importantly, due to the pollution and timeliness of the treatment agent, the overall quality and environmental protection of the UV tape product is reduced, and it cannot be widely used

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