Pressure sensitive adhesive and a pressure sensitive adhesive fi

Details Pressure sensitive adhesive and a pressure sensitive adhesive fi Pressure sensitive adhesive and a pressure sensitive adhesive fi

1988-12-21

1990-04-03

Lesmes, George F.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Adhesive outermost layer

428355, 428518, 428520, 428913, B32B 2708, B32B 2716, B32B 2720, B32B 2730

Patent

active

049139606

ABSTRACT:
A pressure sensitive adhesive film reducible in the adhesive force by the application thereto of ultraviolet light which comprises: (a) a base film permeable to ultraviolet light; and (b) a layer of a pressure sensitive adhesive formed on one side of the base film, the adhesive comprising: (i) at least one elastic polymer selected from the group consisting of a polymer mainly composed of an acrylic acid ester copolymer and a saturated copolyester mainly composed of dibasic carboxylic acids and dihydroxy alcohols; (ii) an ultraviolet light polymerizable acrylic acid ester having not less than two acryloyl or methacryloyl groups in the molecule and having a molecular weight of not more than about 1000, in amounts of about 15-200 parts by weight in relation to 100 parts by weight of the elastic polymer; and (iii) a photopolymerization initiator in amounts sufficient to induce the photopolymerization of the ultraviolet light polymerizable acrylic acid ester.
The film is especially suitable for use as a dicing film in dicing a semiconductor wafer to dices in which the wafer is fixed on the film with a relatively large adhesive force and thereafter the film is irradiated by ultraviolet light from the other side thereof to substantially reduce the adhesive force of the film so that the dice is loosely adhered onto the film.

REFERENCES:
patent: 3060023 (1962-10-01), Burg
patent: 4312916 (1982-01-01), Kakumara
patent: 4398660 (1983-08-01), Pampalone

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