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FILLER TREATMENTS FOR THERMALLY CONDUCTIVE SILICONE ELASTOMERS

IP.com Disclosure Number: IPCOM000024467D
Original Publication Date: 1980-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 88K

Publishing Venue

Xerox Disclosure Journal

Abstract

It is known to incorporate fillers such as silica or aluminum oxide, etc., in high temperature vulcanizable (HTV) silicone elastomers. The present invention relates to the treatment of the filler materials prior to their incorporation in the HTV silicone elastomers. The filler treatment of the present invention enhances the filler-polymer crosslinking action and thus results in increased strength elastomers, particularly when the elastomers are used in silicone oil environment in a fusing apparatus of an electrostatographic copying machine. Most conventional silicone elastomers are cured via methyl/vinyl siloxy groups which are present at low concentrations in the polymer. The present invention provides that the fillers for the polymeric silicone elastomer be pretreated with a coupling agent which will attach to the filler and a reactive radical source. The coupling agent and the reactive radical source may be separately provided or they may be provided in one treating material. Examples of separate treating materials include a conventional silane as the coupling agent and a hydrogen abstracting peroxide as the reactive radical source. Examples of conventional silanes useful as the coupling agent include those having the formula:

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XEROX DISCLOSURE JOURNAL

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FOR TREATMENTS FTI.1.F.R CONDUCTIVE SILICONE ELASTC THERMALLY Proposed Classification

IMERS U.S. Cl. 260/448.2

Int. Cl. C07f 7/02

James A. Lentz
Stephen Strella

It is known to incorporate fillers such as silica or aluminum oxide, etc., in high temperature vulcanizable (HTV) silicone elastomers. The present invention relates to the treatment of the filler materials prior to their incorporation in the HTV silicone elastomers. The filler treatment of the present invention enhances the filler-polymer crosslinking action and thus results in increased strength elastomers, particularly when the elastomers are used in silicone oil environment in a fusing apparatus of an electrostatographic copying machine. Most conventional silicone elastomers are cured via methyl/vinyl siloxy groups which are present at low concentrations in the polymer. The present invention provides that the fillers for the polymeric silicone elastomer be pretreated with a coupling agent which will attach to the filler and a reactive radical source. The coupling agent and the reactive radical source may be separately provided or they may be provided in one treating material. Examples of separate treating materials include a conventional silane as the coupling agent and a hydrogen abstracting peroxide as the reactive radical source. Examples of conventional silanes useful as the coupling agent include those having the formula:

H2C = CHSi (OR)3

in which the R may be an alkyl group. An example of the hydrogen abstracting peroxide is benzoyl peroxide. Examples...