Silicone porous body and method of producing the same

• US 10,472,483 B2
• Filed: 12/25/2015
• Issued: 11/12/2019
• Est. Priority Date: 12/26/2014
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Haruta, Hiromoto, Nakamura, Kozo, Uwada, Kazuki, Takemoto, Hiroyuki, Murakami, Nao, Hattori, Daisuke
• Primary Examiner(s): Boyle, Kara B
• Application Number:
  US15/539,926
• Publication Number:
  US 20170342232A1
• Time in Patent Office: 1,418 Days
• CPC Class Codes: C08G 77/04 Polysiloxanes
• CPC Class Codes: C08J 2201/026 Crosslinking before of after foaming
• CPC Class Codes: C08J 2201/0504 the liquid phase being aqueous
• CPC Class Codes: C08J 2205/02 the finished foam itself being a gel or a gel being temporarily formed when processing the foamable composition
• CPC Class Codes: C08J 2205/05 Open cells, i.e. more than 50% of the pores are open
• CPC Class Codes: C08J 2383/04 Polysiloxanes
• CPC Class Codes: C08J 9/24 by surface fusion and bonding of particles to form voids, e.g. sintering of expandable particles C08J9/232
• CPC Class Codes: C08J 9/28 by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
• CPC Class Codes: C09D 183/04 Polysiloxanes

Abstract

The present invention provides, for example, a silicone porous body having a porous structure with less cracks and a high proportion of void space as well as having a strength. The silicone porous body of the present invention includes silicon compound microporous particles, wherein the silicon compound microporous particles are chemically bonded by catalysis. For example, the abrasion resistance measured with BEMCOT® is in the range from 60% to 100%, and the folding endurance measured by the MIT test is 100 times or more. The silicone porous body can be produced, for example, by forming the precursor of the silicone porous body using sol containing pulverized products of a gelled silicon compound and then chemically bonding the pulverized products contained in the precursor of the silicone porous body. The chemical bond among the pulverized products is preferably a chemical crosslinking bond among the pulverized products, for example.

Claims

1. A silicone porous body comprising:

silicon compound microporous particles, wherein

the silicon compound microporous particles are chemically bonded by catalysis, and

the porosity of the silicone porous body is 40% or more.

2. The silicone porous body according to claim 1, wherein

a porous structure of the silicone porous body is an open-cell structure in which pore structures are interconnected.

3. The silicone porous body according to claim 1, wherein

the silicon compound microporous particle includes a pulverized product of a gelled silica compound.

4. The silicone porous body according to claim 1, wherein

the silicone porous body has a haze value of less than 5%.

5. The silicone porous body according to claim 1, wherein

the silicone porous body is in the form of a film.

6. The silicone porous body according to claim 1, wherein

the silicone porous body has an abrasion resistance showing a strength in a range from 60% to 100%, and

a folding endurance showing flexibility of 100 times or more.

7. The silicone porous body according to claim 1, further comprising:

a crosslinking assisting agent for indirectly bonding the silicon compound microporous particles.

8. The silicone porous body according to claim 7, wherein

a content of the crosslinking assisting agent relative to a weight of the silicon compound microporous particle is in a range from 0.01 wt % to 20 wt %.