Anti-adhesion and anti-static heat-seal coating and cover tape

Abstract

The invention belongs to the technical field of cover tape films, and particularly discloses an anti-adhesion and anti-static heat-seal coating and a cover tape. The anti-blocking and anti-static heat-seal coating is formed by applying a coating liquid with Tg of 60-80 DEG C. The coating liquid comprises the following components: 1-3wt% of cellulose acetate butyrate, 9-18wt% of heat-seal resin, 76-86wt% of a solvent, 2-3wt% of titanium dioxide conductive particles and 0.4-0.8wt% of a dispersing agent. The cover tape comprises a base material layer and the anti-adhesion and anti-static heat-seal coating applied to the base material layer. According to the invention, the problems of high adhesion and non-ideal antistatic effect of the heat-seal layer resin of the existing cover tape can be effectively solved, and the prepared cover tape does not have the phenomena of adhesion and reverse winding; the tension is large, and damage is not likely to happen; and the antistatic effect is lasting.

Description

technical field [0001] The invention belongs to the technical field of cover tape films, and in particular relates to an anti-adhesion and antistatic heat-sealing coating and a cover tape. Background technique [0002] In recent years, with the rapid development of surface mounting of electronic components, surface mounting technology has also made great progress. In order to better preserve and transport small electronic chip components, carrier tape is usually used for packaging, and electronic components are stored in each part of the carrier tape. Pocket, then seal with cover tape. The cover tape is stored in the form of winding before use. After winding, the front and back of the cover tape overlap. After being attached to the carrier tape, it is stored in a coiled state. During storage in the coiled state, the cover tape is in contact with the electronic components and the carrier tape, and the cover tape and the electronic components sometimes stick together, which a...

AI Technical Summary

Problems solved by technology

The cover tape is stored in the form of winding before use. After winding, the front and back of the cover tape overlap. After being attached to the carrier tape, it is stored as a reel. During storage in the reel state, the cover tape is in contact with the electronic components and the carrier tape, and the cover tape and the electronic components may sometimes stick together, which affects the use of the electronic components.

At the same time, the existence of static electricity on the cover tape will also bring certain hazards to the storage and transportation of electronic components. Therefore, the development of a non-adhesive and anti-static cover tape is urgently needed by the market.

[0003] Since the heat-sealing layer resin of the cover tape is sticky, it is generally necessary to add an auxiliary anti-blocking agent to prevent the problems caused by the sticking of the cover tape product. Usually, the added anti-blocking agent is some inorganic fillers, such as carnauba wax and polyolefin wax , spherical or crushed talc particles, silica particles, bauxite particles, mica particles, calcium carbonate, magnesium carbonate, etc., these materials may be unevenly dispersed in the heat-sealing coating liquid, and problems such as agglomeration occur, and then Affects the peel performance of the cover tape

At the same time, the cover tape must also provide some protection against static electricity. Static electricity will cause breakdown and other damage to precision electronic components, and the winding and unwinding of the cover tape will aggravate such problems. In order to avoid damage to electronic components caused by static electricity, In the prior art, ionic antistatic agents are usually added to the cover tape coating. The hydrophilic groups in the molecules of such antistatic agents are all arranged toward the air side, which is easy to absorb environmental moisture, or interact with moisture in the air through hydrogen bonds. Combined, a monomolecular conductive layer is formed, so that the generated static charge can leak quickly to achieve the purpose of antistatic, but this kind of antistatic agent is greatly affected by air humidity, and the antistatic effect is short-lived

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