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Process for preparing silicone emulsions

An organosilicon emulsion and organic technology, applied in the field of preparing organosilicon emulsions and organosilicon emulsions, can solve problems such as long reaction time

Inactive Publication Date: 2014-09-03
DOW CORNING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, to obtain high molecular weight polymers using suspension polymerization techniques, generally longer reaction times are required

Method used

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  • Process for preparing silicone emulsions
  • Process for preparing silicone emulsions

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[0050]The following examples are included to illustrate preferred embodiments of the invention. It should be appreciated by those of skill in the art that the techniques disclosed in the examples which follow represent techniques discovered by the inventors to function well in the practice of the invention, and thus can be considered to constitute preferred modes for its practice. However, those of skill in the art should, in light of the present disclosure, appreciate that many changes can be made in the specific embodiments which are disclosed and still obtain a like or equivalent result without departing from the spirit and scope of the invention. All percentages are % by weight. All measurements were performed at 23°C unless otherwise indicated.

[0051] Dimethicone polymer was prepared by emulsifying 363.7 g of hydroxyl-terminated polydimethylsiloxane ( Its viscosity at 25°C is 70 mPa·s).

[0052] The following procedure was used for emulsification:

[0053] - Mix DBS...

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Abstract

The present disclosure provides a process for preparing silicone emulsions via suspension polymerization techniques that are faster and / or provide higher molecular weight organopolysiloxanes than conventional techniques. The process involves combining a) an emulsifier, b) a silanol functional organopolysiloxane, c) a polymerization catalyst, and water to form a mixture, shearing the mixture to form an emulsion having a dispersed phase of the organopolysiloxane, reacting the emulsion in a closed system having a pressure greater than 1 MPa to polymerize the organopolysiloxane.

Description

[0001] Cross references to related patent applications [0002] This application claims the benefit of US Patent Application Serial No. 61 / 569500, filed December 12, 2011. Background technique [0003] Silicone emulsions are well known in the art. Silicone emulsions can be prepared by various methods such as (i) mechanical emulsification, (ii) mechanical emulsification by inversion, or (iii) emulsion polymerization. However, due to the high viscosity of some silicones, such as high molecular weight silicone fluids, silicone gums, silicone rubbers, silicone elastomers, and silicone resins, their emulsification is often limited to emulsion polymerization techniques. Attempts to emulsify silicone gels, silicone rubbers, silicone elastomers, and silicone resins using mechanical methods have also been limited because it is difficult to include a surfactant or a mixture of surfactants in a silicone gel. , silicone rubber, silicone elastomer or silicone resin. It is also difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/06C08G77/08C08L83/04
CPCC08G77/06C08L83/04C08G77/08C08L2201/52
Inventor 塞维林·科万A·斯塔默A·T·沃尔夫
Owner DOW CORNING CORP