Sheet for carrier tape

Details Sheet for carrier tape Sheet for carrier tape

2007-09-11

2007-09-11

Teskin, Fred (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S080000, C525S087000, C525S093000, C428S521000

Reexamination Certificate

active

10569052

ABSTRACT:
The present invention relates to a sheet for a carrier tape, having at least one layer comprising (I) a block copolymer comprising a vinyl aromatic hydrocarbon and a conjugated diene, (II) a non-rubber-modified vinyl aromatic type hydrocarbon polymer, and (III) a rubber-modified vinyl aromatic type hydrocarbon polymer, wherein the peak molecular weight of the vinyl aromatic hydrocarbon polymer block in the block copolymer (I) is from 30,000 to 80,000, the half-width in the molecular weight distribution curve of the vinyl aromatic hydrocarbon block is from 1.3 to 2.8, the vinyl aromatic hydrocarbon content in the sheet for a carrier tape is from 75 to 95 wt %, and the content of the vinyl aromatic hydrocarbon polymer component is from 65 to 85 wt %.The sheet for a carrier tape of the present invention is transparent and excellent in the balance of physical properties such as rigidity, impact resistance and heat shrinkability, and therefore, can be suitably used for a carrier tape for packaging an electronic component (e.g., IC, LSI) in an electronic device.

REFERENCES:
patent: 6235847 (2001-05-01), Hoshi et al.
patent: 6660790 (2003-12-01), Hoshi et al.
patent: 7-179696 (1995-07-01), None
patent: 10-279755 (1998-10-01), None
patent: 2001-191461 (2001-07-01), None
patent: 2002-331621 (2002-11-01), None

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