Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Reexamination Certificate
2005-08-16
2005-08-16
Tran, Thao T. (Department: 1711)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
C428S3550EP, C428S3550RA, C428S447000
Reexamination Certificate
active
06929856
ABSTRACT:
Dicing tape comprises a tackifiable adhesive layer which is composed mainly of a polyimide and has a peel strength of 0.02 N/mm (20 gf/cm) or greater as the adhesive strength at near room temperature (20-50° C.) and a cured peel strength of 0.3 N/mm (300 gf/cm) or greater. The tape exhibits adhesive strength with silicon wafers sufficiently high to allow dicing at near room temperature, and also exhibits high adhesive strength with circuit boards after curing, in light of the processing disadvantages of polyimide-based dicing tape resulting from its low tacky strength (initial adhesive strength) at low temperatures of around room temperature, which requires a higher ambient temperature to increase the adhesive force and thus necessitates supplementary heating equipment.
REFERENCES:
patent: 5180627 (1993-01-01), Inoue et al.
patent: 6271107 (2001-08-01), Massingill et al.
patent: 6335571 (2002-01-01), Capote et al.
patent: 05025452 (1993-02-01), None
patent: 05025453 (1993-02-01), None
patent: 10324857 (1998-12-01), None
Hayashi Koji
Ishikawa Seiji
Sonoyama Kenji
DLA Piper Rudnick Gray Cary US LLP
Tran Thao T.
Ube Industries Ltd.
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