Title:
SILICONE ADHESIVE COMPOSITION, ADHESIVE TAPE, ADHESIVE SHEET AND DOUBLE-SIDED ADHESIVE SHEET
Document Type and Number:
WIPO Patent Application WO/2019/087759
Kind Code:
A1
Abstract:
[Problem] In view of the above-described background, the purpose of the present invention is to provide: an adhesive composition which is able to be easily separated from a release liner, and wherein a silicone adhesive after separation is able to exhibit a strong adhesive force without depending on the separation rate; an adhesive tape and an adhesive sheet, each of which comprises a cured product of this composition; and a double-sided adhesive sheet which is composed of a cured product of this composition.
[Solution] The present invention provides a silicone adhesive composition which contains the components (A)-(C) described below.
(A): A condensation product of the component (a1), the component (b) and the component (a2) described below, or a combination of the component (a2) and a condensation product of the component (a1) and the component (b), wherein: the mass ratio of the component (a1) to the component (a2) is from 100/0 to 45/55; and the content of the component (b) is 75-40 parts by mass relative to 100 parts by mass of the total of the component (a1), the component (a2) and the component (b).
(a1): A linear or branched diorganopolysiloxane which has a hydroxyl group bonded to a silicon atom and/or an alkoxy group having 1-10 carbon atoms at an end, and which does not have an alkenyl group.
(a2): A linear or branched diorganopolysiloxane which has two or more alkenyl groups in each molecule, while having an alkenyl group content of 0.0005 mol/100 g or more but less than 0.15 mol/100 g, and which optionally has a hydroxyl group bonded to a silicon atom or an alkoxy group having 1-10 carbon atoms.
(b): An organopolysiloxane which has an R1
3SiO0.5 unit and an SiO2 unit, while having a hydroxyl group bonded to a silicon atom and/or an alkoxy group bonded to a silicon atom and having 1-6 carbon atoms, and wherein the molar ratio of the R1
3SiO0.5 unit to the SiO2 unit is from 0.5 to 1.5 (provided that R1 independently represents a substituted or unsubstituted monovalent hydrocarbon group having 1-10 carbon atoms).
(B): 0.1-5 parts by mass of an organohydrogen polysiloxane relative to 100 parts by mass of the component (A), said organohydrogen polysiloxane having three or more SiH groups in each molecule, while having an average degree of polymerization of 80 or less.
(C): A catalytic amount of a platinum group metal catalyst.
The present invention also provides: an adhesive tape or an adhesive sheet, which has a layer that is composed of a cured product of the above-described silicone adhesive composition; and a double-sided adhesive sheet which is composed of a cured product of the above-described silicone adhesive composition.
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Inventors:
NAKAYAMA KEN (JP)
KURODA YASUYOSHI (JP)
KURODA YASUYOSHI (JP)
Application Number:
PCT/JP2018/038351
Publication Date:
May 09, 2019
Filing Date:
October 15, 2018
Export Citation:
Assignee:
SHINETSU CHEMICAL CO (JP)
International Classes:
C09J183/04; C09D183/08; C09J7/10; C09J7/38; C09J7/40; C09J11/04; C09J11/06; C09J183/05; C09J183/06; C09J183/07
Domestic Patent References:
| WO2015151221A1 | 2015-10-08 | |||
| WO2010100024A1 | 2010-09-10 |
Foreign References:
| JP2012041505A | 2012-03-01 | |||
| JP2011001448A | 2011-01-06 | |||
| JPH0718185A | 1995-01-20 | |||
| JP2017222819A | 2017-12-21 | |||
| JP2002363523A | 2002-12-18 | |||
| JP2013091785A | 2013-05-16 | |||
| JP2016180021A | 2016-10-13 | |||
| JP2013173944A | 2013-09-05 | |||
| JP2016182772A | 2016-10-20 |
Other References:
See also references of EP 3705548A4
Attorney, Agent or Firm:
MATSUI Mitsuo et al. (JP)
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