Silicone porous body and method of producing the same

Patent metadata

Field	Value
Publication number	US-2019330438-A1
Application number	US-201916503009-A
Country	US
Kind code	A1
Filing date	Jul 3, 2019
Priority date	Dec 26, 2014
Publication date	Oct 31, 2019
Grant date	—

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.

First claim

1 . A method of producing a silicone porous body, comprising steps of:
preparing a liquid containing silicon compound microporous particles; adding a catalyst for chemically bonding the silicon compound microporous particles to the liquid; and chemically bonding the microporous particles by catalysis.

2 . The method according to claim 1 , wherein
the catalysis in the bonding step is wet-type treatment and/or dry-type treatment.

3 . The method according to claim 1 , wherein
the silicon compound microporous particle includes a silica sol fine particle.

4 . The method according to claim 3 , wherein
the silica sol fine particle is obtained by pulverizing a gelled silica compound.

5 . The method according to claim 4 , wherein
the pulverization is performed by high pressure medialess pulverizing.

6 . The method according to any one of claim 1 , wherein
in the bonding step, the chemical bond is a crosslinking bond.

7 . The method according to any one of claim 1 , wherein
a drying temperature for the catalysis in the bonding step is 50° C. or more and less than 200° C.

8 . The method according to any one of claim 1 , further comprising a step of:
adding a crosslinking assisting agent for indirectly bonding the silicon compound microporous particles to the liquid.

9 . The method according to claim 8 , wherein
an amount of the crosslinking assisting agent to be added relative to a weight of the silicon compound microporous particle is in a range from 0.01 wt % to 20 wt %.

Assignees

• Nitto Denko Corp

Inventors

• Haruta Hiromoto
• Nakamura Kozo
• Uwada Kazuki
• Takemoto Hiroyuki
• Murakami Nao
• Hattori Daisuke

Classifications

• C08J2383/04

  Polysiloxanes · CPC title

• C08G77/04

  Polysiloxanes · CPC title

• C08J2201/0504

  the liquid phase being aqueous · CPC title

• C08J2205/02

  the finished foam itself being a gel or a gel being temporarily formed when processing the foamable composition · CPC title

• C08J2201/026

  Crosslinking before of after foaming · CPC title