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Silicone composition which is cross-linkable by dehydrogenative condensation in the presence of a metal catalyst

A composition and dehydrogenation technology, applied in physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, adhesives, etc., can solve toxic and other problems

Inactive Publication Date: 2012-05-16
BLUESTAR SILICONES FRANCE SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, alkyltin-based catalysts, although very effective, usually colorless, liquid and soluble in silicone oils, have the disadvantage of being toxic (CMR2, toxic for reproduction)

Method used

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  • Silicone composition which is cross-linkable by dehydrogenative condensation in the presence of a metal catalyst
  • Silicone composition which is cross-linkable by dehydrogenative condensation in the presence of a metal catalyst
  • Silicone composition which is cross-linkable by dehydrogenative condensation in the presence of a metal catalyst

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Experimental program
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Embodiment

[0176] I) Preparation of the catalyst according to the invention

[0177] a) Synthesis of catalyst (5): [Zn (isopropyl acetoacetate) 2 ] or [Zn(iPr-AA) 2 ]， Where iPr-AA = isopropyl acetoacetate anion or enol of isopropyl acetoacetate anion

[0178] A 97% solution of 100 mmol sodium methoxide (6.12 g) in 100 ml isopropanol was concentrated 20% by distillation, then 95% 100 mmol isopropyl acetoacetate (15.93 g) was added and the solution was heated at 80° C. for 1 Hours, an orange homogeneous solution was produced. A solution of zinc chloride (50 mmol, 7 g) in 50 ml isopropanol was then added at 70° C. within 1 hour. Heating was maintained at 80-90° C. for 3 hours and 30 minutes, and then, after cooling, the sodium chloride formed was filtered. The alcoholic solution was evaporated to dryness to obtain 25.3 g of a paste which was redissolved in 200 ml of ethanol. After hot filtration and evaporation to dryness, 17.2 g of white solid were obtained (98% yield)....

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Abstract

The present invention relates to a silicone composition including components having SiH / SiOH groupings and which can be polymerized / cross-linked by a dehydrogenative condensation reaction in the presence of a zinc catalyst and requiring a low activation temperature.

Description

technical field [0001] The present invention relates to the field of catalysis enabling dehydrogenation condensation reactions for the polymerization / crosslinking of silicones. The reactive substances involved are monomers, oligomers and / or polymers of the polyorganosiloxane type. Background technique [0002] The reactive motifs involved in these substances are on the one hand ≡SiH units and on the other hand ≡SiOH units. The dehydrogenative condensation between these silicone reactive units leads to the formation of ≡Si-O-Si≡ bonds and to the release of hydrogen gas. [0003] This dehydrocondensation is an alternative to the polymerization / crosslinking route known in the silicone art, namely polyaddition via reactions between ≡SiH and ≡Si-alkenyl (vinyl) units pathway, or the polycondensation pathway via the reaction between ≡SiOR and ≡SiOR units (where R=alkyl). All these polymerization / crosslinking routes lead to more or less polymerized and more or less crosslinked s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/08C08G77/12C08G77/16C08L83/06C09D183/04C08L83/04C09J7/02C08J7/04C08J9/00C08J9/02B01J31/22B01J31/28
CPCC08J2201/024C08G77/16C08L83/04C08L2205/02C08K5/56C08G77/12C09D183/04C08J9/02B01J2531/26B01J31/2213C08J2383/04C08G2101/00C08L83/00C08G77/08
Inventor C·马利维尔尼
Owner BLUESTAR SILICONES FRANCE SAS
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