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Method for preparing polyorganosiloxane (pos) by ring(s)-opening polymerisation and/or pos redistribution in the presence of carbene(s) and pos compounds produced by said method

A polyorganosiloxane, redistribution technology, applied in the composition of POS and carbene catalysts, the ring-opening and/or redistribution polymerization of POScy to prepare POS field, can solve the problem of not being able to obtain high molecular weight, and achieve excellent Stability, simple operation, simple synthesis effect

Inactive Publication Date: 2007-02-21
RHODIA CHEM SA +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymerization tests show that the first group of catalysts does not favorably and selectively achieve high molecular weight

Method used

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  • Method for preparing polyorganosiloxane (pos) by ring(s)-opening polymerisation and/or pos redistribution in the presence of carbene(s) and pos compounds produced by said method
  • Method for preparing polyorganosiloxane (pos) by ring(s)-opening polymerisation and/or pos redistribution in the presence of carbene(s) and pos compounds produced by said method
  • Method for preparing polyorganosiloxane (pos) by ring(s)-opening polymerisation and/or pos redistribution in the presence of carbene(s) and pos compounds produced by said method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0245] 10 grams of octamethylcyclotetrasiloxane (D4) and 100 mg of hexamethylsiloxane (M2) were mixed in a 30 ml flask. 100 mg of imidazolium tetrafluoroborate 1 (0.34 mmol) and 39 mg of t-BuOK (0.34 mmol) were placed in a weighing tube. 0.5 mL of anhydrous THF was added, and the resulting suspension was quickly added to the flask containing M2 and D4.

[0246] The reaction mixture was stirred at room temperature for 24 hours. It slowly became viscous and silicon NMR analysis showed that 95% of the D4 was polymerized in the form of polysiloxane chains.

Embodiment 2

[0248] 10 grams of octamethylcyclotetrasiloxane (D4) and 100 mg of hexamethylsiloxane (M2) were mixed in a 30 ml flask. 100 mg of imidazolium tetrafluoroborate 1 (0.34 mmol) and 39 mg of t-BuOK (0.34 mmol) were placed in a weighing tube. 0.5 mL of anhydrous THF was added, and the resulting suspension was quickly added to the flask containing M2 and D4.

[0249] The reaction mixture was stirred at 60°C for 2 hours. It slowly became viscous and silicon NMR analysis showed that 95% of the D4 was polymerized in the form of polysiloxane chains.

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Abstract

The invention relates to a method for preparing polyorganosiloxane (POS) by a ring(s)-opening polymerisation and / or linear, non-linear or cyclic POS redistribution in the presence of a nucleophile carbene The aim of said invention is to offer an improved method for preparing POS by means of an efficient catalytic system at a low temperature, wherein the initial (for example of D4) efficiency of the POS conversion is substentially increased in comparison with a preceding state of the art in such a way that the initial POS (for example of D4) residual content is less than before. For this purpose, the following components are used: 500g of POS and / or POScy (i.e. D4), 0-10 g, preferably 0.5-2 g of chain stopper (i.e. M2), 0-10g, preferably 0.01-1g of a carbene salt precursor (formulas (III) or (III'), i.e. imidazolium salt), 0-10g, preferably 0.01-0.5g of base (i.e. t-Bu-OK) and 0.1-10 ml of a solvent (i.e.THF).

Description

technical field [0001] The technical field of the invention is the synthesis of silicones by ring-opening and / or redistribution polymerization of linear and / or nonlinear and / or cyclic POS: polyorganosiloxanes (POS). [0002] More specifically, the present invention relates to the preparation of POS by ring-opening and / or redistribution polymerization of POS, especially POScy, in the presence of a catalyst (or initiator) consisting of at least one nucleophilic carbene. [0003] The present invention also relates to the composition of POS and carbene catalyst, and it is used for the reaction that ring-opening and / or redistribution polymerization is carried out to cyclic POS, makes POS oil (for example, molar amount from 10 3 to 10 4 ) or POS rubber (for example, molar mass from 10 3 to 10 7 ). [0004] The invention also relates to certain POS or silanes which catalyze the substitution of carbene functional groups as novel products. Background technique [0005] Silicones...

Claims

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Application Information

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IPC IPC(8): C08G77/08
CPCC08G77/08C08G77/00C08G77/06
Inventor 德尔菲娜·布郎-马尼亚尔塞巴斯蒂安·斯特兰艾蒂安·弗勒里奥利维埃·比西纳安托万·巴塞雷多
Owner RHODIA CHEM SA
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