Cover tape for surface mount device packaging
AssigneeBrady Precision Tape Co.
InventorSohail Akhter
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Abstract
High clarity, tear resistant, static dissipative cover tapes for two-piece surface mount device packaging tapes are described comprising of backing film, e.g. a polyester film, one side of which is coated with a thin layer of heat-sealable adhesive, e.g. an adhesive comprising a styrenic block elastomer, and the other side of which is coated with an organic antistatic agent. The cover tapes of this invention can be used with carrier tapes made from a variety of materials, e.g. polystyrene, polyvinyl chloride, polycarbonate, etc., and demonstrate a consistent peel force of between about 10 and about 120 grams.
Claims18
A low haze, high light transmission, static dissipative, heat-sealable, tear resistant cover tape comprising an unmetallized backing film one side of which is coated with an adhesive composition and the other side of which is coated with a first organic antistatic agent, the adhesive composition comprising at least one:
- A. Thermoplastic elastomer comprising a styrenic block copolymer,
- B. Modifying agent comprising a polyester copolymer,
- C. Antiblock agent comprising microspheres, and
- D. Second organic antistatic agent.
A low haze, high light transmission, static dissipative, heat-sealable, tear resistant cover tape comprising an unmetallized backing film one side of which is coated with an adhesive composition and the other side of which is coated with a first organic antistatic agent, the adhesive composition comprising, in weight percent based on the weight of the adhesive composition, between about:
- A. 60 and about 90 percent of at least one thermoplastic elastomer comprising a styrenic block copolymer,
- B. >0 and about 30 percent of at least one modifying agent comprising a polyester copolymer,
- C. 1 and about 20 percent of at least one antiblock agent comprising microspheres, and
- D. 0.2 and about 10 percent of at least one second organic antistatic agent.
Dependencies are inferred from the claim text.