Silicone porous body and method of producing the same

Patent metadata

Field	Value
Publication number	US-10472483-B2
Application number	US-201515539926-A
Country	US
Kind code	B2
Filing date	Dec 25, 2015
Priority date	Dec 26, 2014
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

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

The invention claimed is:

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 %.

Assignees

• Nitto Denko Corp

Inventors

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

Classifications

• C08G77/04

  Polysiloxanes · CPC title

• C08J2201/026

  Crosslinking before of after foaming · CPC title

• C08J2205/05

  Open cells, i.e. more than 50% of the pores are open · CPC title

• C08J2205/02

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

• C08J9/28 Primary

  by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum · CPC title