Thermally conductive sheet product and method for producing same

Patent metadata

Field	Value
Publication number	US-2024316910-A1
Application number	US-202218579081-A
Country	US
Kind code	A1
Filing date	Jul 4, 2022
Priority date	Jul 14, 2021
Publication date	Sep 26, 2024
Grant date	—

Abstract

The present invention provides: a thermally conductive sheet product wherein both surfaces of a fluorine rubber-based thermally conductive sheet are protected from foreign substances and the like, and excellent setting workability is achieved between a heat generation member and a heat dissipation member; and a method for producing this thermally conductive sheet product.
A thermally conductive sheet product which is obtained by bonding electrically insulating films to both surfaces of a thermally conductive sheet that is formed of a cured product of a thermally conductive fluorine-containing curable composition containing
(A) a linear polyfluoro compound which comprises two or more alkenyl groups in each molecule, while having a perfluoro polyether structure in the main chain, (B) a fluorine-containing organohydrogen siloxane which comprises a perfluoroalkyl group or a perfluorooxyalkyl group in each molecule, or alternatively comprises a perfluoroalkylene group or a perfluorooxyalkylene group, while additionally containing two or more groups (SiH groups), wherein a hydrogen atom is directly bonded to a silicon atom, in each molecule, and which does not comprise an alkoxy group that is directly bonded to a silicon atom in the molecule. (C) a platinum group metal-based catalyst and (D) a specific amount of a thermally conductive filler.

First claim

1 . A thermally conductive sheet product comprising a thermally conductive sheet and electrically insulating films attached on both sides of the thermally conductive sheet, the thermally conductive sheet comprising a cured product of a thermally conductive fluorine-containing curable composition comprising:
(A) 100 parts by weight of a linear polyfluoro compound having two or more alkenyl groups in one molecule and having a perfluoropolyether structure in a main chain; (B) a fluorine-containing organohydrogensiloxane having, in one molecule, one or more selected from perfluoroalkyl groups, perfluorooxyalkyl groups, perfluoroalkylene groups, and perfluorooxyalkylene groups, and further having two or more hydrogen atoms directly bonded to silicon atoms (SiH groups), and free of an alkoxy group directly bonded to a silicon atom in the molecule, in an amount such that the amount of hydrogen atoms directly bonded to silicon atoms in the component (B) is 0.50 to 3.0 mol per 1 mol of alkenyl groups contained in the whole of the composition; (C) a platinum group metal-based catalyst in an amount of 0.1 to 2,000 ppm in terms of the weight of platinum group metal atoms with respect to the component (A); and (D) 100 to 4,000 parts by weight of a thermally conductive filler.

2 . The thermally conductive sheet product according to claim 1 , wherein the electrically insulating films have a thickness of 1 to 200 μm.

3 . The thermally conductive sheet product according to claim 1 , wherein the electrically insulating films are films of at least one selected from the group consisting of polyolefins, polyimides, polyamides, polyesters, aromatic polyether ketones, fluorine-containing polymers, polyvinyl chlorides, and paper.

4 . The thermally conductive sheet product according to claim 1 , wherein the electrically insulating films are polyethylene terephthalate (PET) films.

5 . The thermally conductive sheet product according to claim 1 , wherein at least one of the electrically insulating films is treated with a fluorine-containing silicone release agent on a side in contact with the thermally conductive sheet.

6 . The thermally conductive sheet product according to claim 5 , wherein the fluorine-containing silicone release agent is an organopolysiloxane having one or more perfluoroalkyl groups or perfluorooxyalkyl groups.

7 . The thermally conductive sheet product according to claim 6 , wherein the perfluoroalkyl groups or the perfluorooxyalkyl groups are groups having the following general formula (1) or general formula (2):
C f″ F 2f″+1 —  (1)

wherein f″ is an integer of 1 to 10,

wherein g″ is an integer of 1 to 30.

8 . The thermally conductive sheet product according to claim 1 , wherein the thermally conductive fluorine-containing curable composition further comprises, as a component (E), a fluorine-containing organosilicon compound having, in one molecule, one or more perfluoroalkyl groups or perfluorooxyalkyl groups, and further having one or more alkoxy groups directly bonded to silicon atoms, and free of a hydrogen atom directly bonded to a silicon atom (a SiH group) in the molecule, in an amount of 0.01 to 300 parts by weight per 100 parts by weight of the component (A).

9 . The thermally conductive sheet product according to claim 1 , wherein the thermally conductive fluorine-containing curable composition further comprises, as a component (F), at least one non-functional polyfluoro compound selected from the group consisting of compounds having the following general formula (3) and the following general formula (4), in an amount of 0.1 to 300 parts by weight per 100 parts by weight of the component (A):
F—(CF 2 CF 2 CF 2 O) a -A  (3)

wherein A is a group having —C b F 2b+1 (b is an integer of 1 to 3) and a is an integer of 1 to 500,
A-{(OCF(CF 3 )CF 2 ) c —(OCF 2 CF 2 ) d —(OCF 2 ) u′ })—O-A  (4)

wherein A is the same as above, c and d are each an integer of 0 to 300, u′ is an integer of 1 to 300, c and d are not 0 at the same time, and the repeating units may be randomly arranged.

10 . The thermally conductive sheet product according to claim 1 , wherein the thermally conductive fluorine-containing curable composition further comprises, as a component (G), a polyfluoromonoalkenyl compound having one alkenyl group in one molecule and having a perfluoropolyether structure in a main chain, in an amount of 0.1 to 100 parts by weight per 100 parts by weight of the component (A).

11 . The thermally conductive sheet product according to claim 1 , wherein the alkenyl group content in the component (A) is 0.0050 to 0.300 mol/100 g.

12 . The thermally conductive sheet product according to claim 1 , wherein the perfluoropolyether structure in the component (A) comprises a structure having the following general formula (5):
—(C m F 2m O) n —  (5)

wherein m is an integer of 1 to 6 and n is an integer of 1 to 300.

13 . The thermally conductive sheet product according to claim 1 , wherein the component (A) is one or more linear polyfluoro compounds selected from the group consisting of the following general formula (6) and the following general formula (7):

wherein R 1 and R 2 independently at each occurrence denote an alkenyl group or an unsubstituted or substituted monovalent hydrocarbon group free of an aliphatic unsaturated bond, 2 or more of all of R 1 and R 2 are alkenyl groups, R 3 independently at each occurrence denotes a hydrogen atom or an unsubstituted or substituted monovalent hydrocarbon group, e and f are each an integer of 1 to 150, the average value of e+f is 2 to 300, and g is an integer of 1 to 6,

wherein R 4 independently at each occurrence denotes an alkylene group having 1 to 6 carbon atoms, R 5 independently at each occurrence denotes a hydrogen atom or an alkyl group having 1 to 4 carbon atoms that may be substituted with fluorine, and R 1 , R 2 , e, f, and g are the same as above.

14 . The thermally conductive sheet product according to claim 1 , wherein the component (D) is at least one selected from metals, metal oxides, metal nitrides, metal hydroxides, metal carbides, soft magnetic alloys, and ferrites.

15 . The thermally conductive sheet product according to claim 14 , wherein the component (D) is alumina.

16 . The thermally conductive sheet product according to claim 15 , wherein the component (D) is amorphous alumina and/or spherical alumina.

17 . The thermally conductive sheet product according to claim 16 , wherein the amorphous alumina as the component (D) has an average particle size of 0.2 to 5 μm.

18 . The thermally conductive sheet product according to claim 16 , wherein the spherical alumina as the component (D) has an average particle size of 5 to 100 μm.

19 . The thermally conductive sheet product according to claim 8 , wherein the component (E) is a fluorine-containing organosilicon compound having, in one molecule, one or more perfluoroalkyl groups or perfluorooxyalkyl groups bonded to a silicon atom directly bonded to an alkoxy group, via a divalent hydrocarbon group that may contain a carbon atom, a silicon atom, an oxygen atom, and a nitrogen atom.

20 . The thermally conductive sheet product a

Assignees

• Shinetsu Chemical Co

Inventors

• Koshikawa Hidenori
• Endo Akihiro

Classifications

• B32B2307/202

  Conductive · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B27/08 Primary

  of synthetic resin · CPC title

• B32B2307/206

  Insulating · CPC title

• B32B29/002

  as the main or only constituent of a layer, which is next to another layer of the same or of a different material (next to a layer of a particular substance B32B9/06; next to a bituminous or tarry layer B32B11/06; next to a water-setting substance layer B32B13/08; next to a metal layer B32B15/12; next to a glass layer B32B17/065; next to a layer formed of natural mineral fibres or particles B32B19/046; next to a wood layer B32B21/06; next to a cellulosic plastic layer B32B23/06; next to a natural or synthetic rubber layer B32B25/06; next to a synthetic resin layer B32B27/10) · CPC title