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Organopolysiloxane composition at room temperature vulcanizable to elastomer and organopolysiloxane polycondensation catalysts

A polysiloxane, composition technology, applied in the direction of organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, chemical/physical process, etc.

Inactive Publication Date: 2014-06-04
BLUESTAR SILICONES FRANCE SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015]Titanium based catalysts are also widely used in RTV-1, however have a serious disadvantage: they have slower speed than tin based catalysts
[0016]Other catalysts are sometimes mentioned, such as those based on zinc, zirconium or aluminum, but due to their moderate effectiveness, have only undergone little industrial development

Method used

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  • Organopolysiloxane composition at room temperature vulcanizable to elastomer and organopolysiloxane polycondensation catalysts
  • Organopolysiloxane composition at room temperature vulcanizable to elastomer and organopolysiloxane polycondensation catalysts
  • Organopolysiloxane composition at room temperature vulcanizable to elastomer and organopolysiloxane polycondensation catalysts

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Embodiment

[0222] I) Preparation of the catalytic system according to the invention

[0223] a) Synthesis of metal salts

[0224] (10): [Ce(EAA) 3 ], where EAA=ethyl acetoacetate anion or enolate anion of ethyl acetoacetate-[Ce (ethyl acetoacetate) 3 ]:

[0225] To 12 mmol of cerium trichloride (3 g) in water-ethanol (20 ml EtOH, 10 ml of water) was added 68 mmol of ethyl acetoacetate (8.88 g) and after 10 min to the obtained colorless solution was added 28% ammonia Aqueous solution (4.1 g). After 40 minutes of vigorous stirring, the white solid formed was filtered and dried at 50° C. and 3 mbar to give the target product (3 g), which contained a small amount of cerium hydroxide.

[0226] Calculated % Ce = 26.6%, determined by ICP = 34.5%

[0227] IR data (nm): 2979, 1611, 1505, 1239, 1161, 960.

[0228] (12): [Mo(O 2 )(Cy-acac) 2 ], where Cy-acac=2-acetylcyclohexanone radical anion or enolate anion of 2-acetylcyclohexanone-MoO 2 (2-Acetylcyclohexanone) 2 ,as well as

[0...

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Abstract

RTV-organopolysiloxane compositions are crosslinkable by polycondensation and are devoid of alkyltin-based catalysts; novel organopolysiloxane polycondensation catalysts are useful therefor.

Description

technical field [0001] The present invention relates to organopolysiloxane compositions vulcanizable to elastomers at ambient temperature, crosslinked by polycondensation and free of alkyltin based catalysts which have toxicity problems. [0002] The invention also relates to new polycondensation catalysts in organosilicon chemistry and to their use as catalysts for polycondensation reactions of organopolysiloxanes. [0003] More specifically, the present invention relates to compositions (RTV-2) that are presented in 2-component form prior to use. Background technique [0004] Elastomer formulations crosslinked by polycondensation generally comprise a silicone oil (usually polydimethylsiloxane, with hydroxyl end groups, optionally prefunctionalized with silanes to have alkoxy ends), a crosslinker, a polycondensation catalyst (usually tin salt or alkyl titanate), reinforcing fillers and other optional additives such as extender fillers, adhesion promoters, colorants, bioci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08L83/06C08L83/08C08L83/07C08K5/56
CPCC08K5/0091C08G77/16C08L83/04C08K5/56C08G77/08B01J31/22
Inventor C·马利维尼D·勃朗R·费尔哈
Owner BLUESTAR SILICONES FRANCE SAS
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