Title:
DOUBLE-SIDED ADHESIVE FILM
Document Type and Number:
WIPO Patent Application WO/2021/230313
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a double-sided adhesive film which has a generally equal elongation in the XY (longitudinal and transverse) directions, more preferably in the thickness direction, while being prevented from the occurrence of adhesive protrusion or glue burr, and which has higher adhesive force and higher holding power in comparison to similar single-layer adhesive articles, while being applicable to a stretchable or flexible adherend. A double-sided adhesive film according to the present invention is a substrate-less double-sided adhesive film which is composed of a center layer that is formed of a resin adhesive, and adhesive layers that are superposed on the front surface and the back surface of the center layer, said adhesive layers being formed of a resin that is the same as or similar to the resin that constitutes the center layer, wherein the weight average molecular weight or the crosslinking degree of the resin that constitutes the center layer is higher than the weight average molecular weight or the crosslinking degree of the resin that constitutes the adhesive layers. This double-sided adhesive film is characterized in that the tolerance between the elongation in the longitudinal direction and the elongation in the transverse direction is ±20% or less relative to one of the elongations, more preferably, the elongation in the longitudinal direction and the elongation in the transverse direction are equal to each other.
Inventors:
HAMANO HISASHI (JP)
INAGAKI TATSUO (JP)
INAGAKI TATSUO (JP)
Application Number:
PCT/JP2021/018176
Publication Date:
November 18, 2021
Filing Date:
May 13, 2021
Export Citation:
Assignee:
KYODO GIKEN CHEMICAL CO LTD (JP)
International Classes:
C09J7/10; C09J9/02; C09J11/00; C09J133/06
Foreign References:
| JP2017075281A | 2017-04-20 | |||
| JP2013146945A | 2013-08-01 | |||
| JP2007105983A | 2007-04-26 | |||
| JP2011219665A | 2011-11-04 | |||
| JPH026790B2 | 1990-02-13 |
Attorney, Agent or Firm:
OGURA & CO. (JP)
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