Silicone adhesive composition, adhesive tape, and method for producing adhesive tape

Patent metadata

Field	Value
Publication number	US-10995247-B2
Application number	US-201515116462-A
Country	US
Kind code	B2
Filing date	Jan 8, 2015
Priority date	Feb 13, 2014
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A silicone adhesive composition includes 100 parts by weight of a peroxide-curable silicone, 1.2 to 3.2 parts by weight of an organic peroxide curing agent, and 2 to 9 parts by weight of an addition reaction-curable silicone rubber. An adhesive tape includes a base and an adhesive layer placed on the base, the adhesive layer being formed from the above silicone adhesive composition. The adhesive composition exhibits high load bearing capacity even in higher-temperature environments than ever before. The adhesive tape exhibits high load bearing capacity and good shelf life even in such high-temperature environments.

First claim

The invention claimed is:

1. A silicone adhesive composition consisting essentially of:
100 parts by weight of a peroxide-curable silicone;
1.2 to 3.2 parts by weight of an organic peroxide curing agent; and
2 to 9 parts by weight of an addition reaction-curable silicone rubber, wherein
the peroxide-curable silicone includes (1) at least one selected from the group consisting of a dimethylpolysiloxane which may optionally have a hydroxy group, and a partial condensate thereof and (2) and at least one selected from an MQ resin which is comprises an M unit and a Q unit, and a partial condensate thereof,
the addition reaction-curable silicone rubber contains an addition-polymerizable group, and
the silicone adhesive composition satisfies at least one of the following conditions: (a) a gel fraction of a cured product of the silicone adhesive composition is 40 to 60%; or (b) in an adhesive tape comprising a base and an adhesive layer placed on the base, the adhesive layer being formed from the silicone adhesive composition, an amount of peel in 90° direction is 0 (mm),
wherein the amount of peel in 90° direction is determined by:
(i) cutting the adhesive tape to obtain a 10-mm-wide test specimen;
(ii) attaching the test specimen to a stainless steel plate so that an adhesive area is 10 mm×20 mm and one edge of the test specimen is not in contact with the stainless steel plate;
(iii) applying a load of 20 g, acting in a direction perpendicular to the surface of the stainless steel plate, to the one edge of the test specimen;
(iv) quickly heating the test specimen and the stainless steel plate to 250° C. and holding at 250° C. for 1 hour; and
(v) evaluating an amount of peel of the test specimen.

Assignees

• Nitto Denko Corp

Inventors

• Kigami Hiroki
• Watanabe Yoshinori

Classifications

• C09J183/04 Primary

  Polysiloxanes · CPC title

• C09J2400/143

  in the substrate · CPC title

• C09J2400/263

  in the substrate · CPC title

• C09J2483/00

  Presence of polysiloxane · CPC title

• C09J7/30

  characterised by the adhesive composition · CPC title