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Uses of carbenes in solution as organopolysiloxane polycondensation catalysts

A siloxane oil and organic technology, applied in the field of organopolysiloxane compositions, can solve problems such as instability of carbene catalysts

Active Publication Date: 2014-03-19
BLUESTAR SILICONES FRANCE SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] The carbene catalysts described in the above two applications are unstable and must generally be used either in crystalline form or generated in situ from precursor salts

Method used

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  • Uses of carbenes in solution as organopolysiloxane polycondensation catalysts
  • Uses of carbenes in solution as organopolysiloxane polycondensation catalysts
  • Uses of carbenes in solution as organopolysiloxane polycondensation catalysts

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example

[0262] 1) Dealkoxypolycondensation catalyzed by N-heterocyclic carbene (NHC) and comparison with tin salt at room temperature

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Abstract

The invention relates to the use of novel stable carbenes in solution as organopolysiloxane polycondensation catalysts.

Description

technical field [0001] The present invention relates to an organopolysiloxane composition capable of being vulcanized at room temperature to an elastomer polymerized or crosslinked by polycondensation and free of alkyltin based catalysts which exhibit toxicity problems. [0002] The present invention also relates to the use of novel catalytic polycondensation compositions having a carbene structure and being stable in solution as catalysts for polycondensation reactions of organopolysiloxanes. Background technique [0003] Elastomer formulations crosslinked by polycondensation typically comprise a silicone oil, usually a polydimethylsiloxane, with hydroxyl end groups and optionally prefunctionalized with a silane so as to have alkoxy ends; a crosslinking agent; a polycondensation catalyst, conventionally a tin salt or an alkyl titanate; a reinforcing filler and other optional additives such as extending fillers, Adhesion promoters, colorants, biocides, etc. [0004] These ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/06C08K5/3445B01J31/02C09D183/06A61F13/02C08J7/04C08L83/04C09D183/04
CPCB01J31/0235C08J2483/06A61F13/02C08L83/06C08L83/04C09D183/06C08J7/047C09D183/04C08K5/3445C08G77/08
Inventor C·马里佛内L·圣-雅莱梅斯
Owner BLUESTAR SILICONES FRANCE SAS