Double-sided pressure-sensitive adhesive tape or sheet and process of producing the same
The double-sided pressure-sensitive adhesive tape or sheet is a double-sided pressure-sensitive adhesive tape or sheet containing a support having a pressure-sensitive adhesive layer on the both surfaces thereof, characterized in that the double-sided pressure-sensitive adhesive tape or sheet has a total thickness including the thickness of the support and the two pressure-sensitive adhesive layers formed on the both surfaces of the support of 0.003 mm or more and less than 0.03 mm and a breaking strength of from 2 to 26 MPa/10 mm-width. The support preferably has a thickness of from 0.002 to 0.012 mm. As the support, plastic films (especially, a polyethylene terephthalate film) are suitable. The double-sided pressure-sensitive adhesive tape or sheet may have a length of 5 m or more and have a roll-wound form.
1. A process of producing a double-sided pressure-sensitive adhesive tape or sheet comprising a support having a pressure-sensitive adhesive layer on both surfaces thereof, said method including
(A) a step of coating a pressure-sensitive adhesive on a release treatment surface of a release liner to form a pressure-sensitive adhesive layer on the release liner,
(B) a step of laminating the pressure-sensitive adhesive layer formed on the release liner on one surface of a support to form a first pressure-sensitive adhesive layer on the support without generating wrinkles, and
(C) a step of coating a pressure-sensitive adhesive on the other surface of the support to form a second pressure-sensitive adhesive layer on the support,
wherein the support comprises a plastic film having a thickness of from 0.002 to 0.012 mm,
wherein a total thickness including the thickness of the support and the thicknesses of the two pressure-sensitive adhesive layers formed on both surfaces of the support amounts to 0.003 mm or more and less than 0.03 mm, the thickness of the two pressure-sensitive adhesive layers being the same, and
wherein in the step (B), in laminating the pressure-sensitive adhesive layer formed on the release liner on one surface of the support, a tension to be applied to the support is less than 2 N.
2. The process of producing a double-sided pressure-sensitive adhesive tape or sheet according to claim 1 , wherein the support to be used in the step (B) is a roll-wound longitudinal support, and in feeding the roll-wound longitudinal support to laminate the pressure-sensitive adhesive layer formed on the release liner on one surface of the support, a tension to be applied to the support is less than 2 N.
3. The process of producing a double-sided pressure-sensitive adhesive tape or sheet according to claim 1 , further including (D) a step of roll winding the laminate in such a manner that the second pressure-sensitive adhesive layer is superimposed on the release treatment surface of the other surface of the release liner, to obtain a roll-wound double-sided pressure-sensitive adhesive tape or sheet.
4. The process of producing a double-sided pressure-sensitive adhesive tape or sheet according to claim 1 , wherein the double-sided pressure-sensitive adhesive tape or sheet has a breaking strength of from 2 to 26 MPa/10 mm-width.