Porous body, and method for producing porous body

• US 10,640,623 B2
• Filed: 03/30/2016
• Issued: 05/05/2020
• Est. Priority Date: 04/02/2015
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Saomoto, Kenjiro, Matsuo, Naoyuki
• Primary Examiner(s): Golden, Chinessa T.
• Application Number:
  US15/562,667
• Publication Number:
  US 20180086891A1
• Time in Patent Office: 1,497 Days
• Field of Search: None
• CPC Class Codes: B32B 27/00 Layered products comprising a layer of synthetic resin fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18
• CPC Class Codes: B32B 27/281 comprising polyimides
• CPC Class Codes: B32B 27/285 comprising polyethers
• CPC Class Codes: B32B 27/322 comprising halogenated polyolefins, e.g. PTFE
• CPC Class Codes: B32B 27/325 comprising polycycloolefins
• CPC Class Codes: C08G 77/04 Polysiloxanes
• CPC Class Codes: C08G 77/06 Preparatory processes C08G77/045 takes precedence
• CPC Class Codes: C08J 2201/00 Foams characterised by the foaming process
• 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 2205/04 characterised by the foam pores
• 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 2483/04 Polysiloxanes
• 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: C08J 9/365 Coating
• CPC Class Codes: C08J 9/42 with macromolecular compounds

Abstract

According to the present invention, there are provided a porous body comprising a porous silicone substrate having communicating pores and a three-dimensional network silicone skeleton which forms the pores and which is formed by a copolymerization of a bifunctional alkoxysilane and a trifunctional alkoxysilane, and a polymeric cover material covering at least a part of a surface of the silicone skeleton, and an a method for producing the porous body. The porous body of the present invention has high flexibility and is strong to tension.

Claims

1. A porous body comprising:

a porous silicone substrate having communicating pores and a three-dimensional network silicone skeleton which forms the pores and which is formed by a copolymerization of a bifunctional alkoxysilane and a trifunctional alkoxysilane; and

a polymeric cover material covering at least a part of a surface of the porous silicone skeleton,

wherein the porous body has an elastic modulus at 20% strain of 0.01 MPa or more, and

wherein the polymeric cover material consists of silicone, and

wherein a solution for forming the polymeric cover material contains a polymeric material in a concentration of 1% to 5% by weight.

2. The porous body according to claim 1, having a compressive stress at 80% strain of 0.6 MPa or less.

3. The porous body according to claim 1, wherein the solution for forming the polymeric cover material contains a polymeric material in a concentration of 1% to 3% by weight.

4. A method for producing the porous body according to claim 1, comprising:

covering, with a polymeric cover material, at least a part of a surface of a porous silicone substrate having communicating pores and a three-dimensional network silicone skeleton which forms the pores and which is formed by a copolymerization of a bifunctional alkoxysilane and a trifunctional alkoxysilane,

wherein the porous body has an elastic modulus at 20% strain of 0.01 MPa or more.

5. The method according to claim 4, wherein the covering step comprises dipping the porous silicone substrate in a solution of a polymeric material for forming the polymeric cover material, and then taking the porous silicone substrate out of the solution.