Composite material, formed body, electronic device with formed body, and method for manufacturing a formed body

Patent metadata

Field	Value
Publication number	US-9228914-B2
Application number	US-201113990512-A
Country	US
Kind code	B2
Filing date	Nov 23, 2011
Priority date	Dec 1, 2010
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

A composite material includes a polymer matrix and silica gel, which is bound in the polymer matrix. The volume fraction of the silica gel to the volume fraction of the composite material amounts to at least 50%, especially at least 65%. An electronic device, especially measuring device, includes at least one housing having at least one inner space, which contains an electronic circuit, wherein the device has at least one gas path, via which moisture can get into the housing, wherein the device has at least one formed body of the composite material.

First claim

The invention claimed is:

1. An electronic device, especially a measuring device, comprising:
at least one housing having at least one inner space, which contains an electronic circuit, wherein:
the device has at least one gas path, via which moisture can get into the housing; and
in that the device has at least one formed body, comprising a composite material, including: a polymer matrix; and silica gel, which is bound in the polymer matrix, wherein:
the volume fraction of the silica gel to the volume fraction of the composite material amounts to at least 50%.

2. The electronic device as claimed in claim 1 , wherein:
said formed body is arranged in the inner space.

3. The electronic device as claimed in claim 1 , wherein:
the device includes a relative pressure sensor for measuring the difference between a media pressure and an atmospheric pressure in the environment of the sensor;
the device has an atmospheric pressure path, in order to supply the pressure sensor with the atmospheric pressure; and
the atmospheric pressure path extends especially through the formed body.

4. The electronic device as claimed in claim 1 , wherein:
the volume of the formed body amounts to not less than 20%, preferably not less than 40% and especially preferably not less than 60% of the free volume of the inner space.

5. The electronic device as claimed in claim 1 , wherein:
the volume fraction of the silica gel to the volume fraction of the composite material amounts to at least 65%.

Assignees

• Uehlin Thomas
• Rossberg Andreas
• Lopatin Sergej
• Endress & Hauser Gmbh & Co Kg

Inventors

• Uehlin Thomas
• Rossberg Andreas
• Lopatin Sergej

Classifications

• B01J2220/46

  Materials comprising a mixture of inorganic and organic materials (materials coated or impregnated on a carrier B01J20/32) · CPC title

• B01J20/103

  comprising silica · CPC title

• B01J20/264

  derived from different types of monomers, e.g. linear or branched copolymers, block copolymers, graft copolymers · CPC title

• B01J20/26

  Synthetic macromolecular compounds · CPC title

• B01J20/261

  obtained by reactions only involving carbon to carbon unsaturated bonds (macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds per se C08F) · CPC title