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Emulsions of branched organopolysiloxanes

A kind of polysiloxane, organic technology, applied in the field of preparing branched organopolysiloxane and its emulsion

Inactive Publication Date: 2016-09-28
DOW CORNING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Attempts to use mechanical methods for emulsifying silicones such as high molecular weight and viscosity organopolysiloxane polymers have been largely unsuccessful due to the aforementioned problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0125] 500 parts of dimethylhydroxyl-terminated polydimethylsiloxane with a viscosity of 70 mPa·s at 25° C., Mn of 2500 g / mol and Mw of 3500 g / mol and 500 parts of Hydroseal G 250H hydrocarbon oil (provided by Total Company (Total) and 2 parts of methyltrimethoxysilane (MTM). Add 15 parts per million (ppm) of ionic phosphazene [Cl(PCl) diluted in dichloromethane 2 =N) x PCl 3 ] + [PCl 6 ] - (x is 1 to 11) as a catalyst. Polymerization was carried out at 70° C. under vacuum in a 1 liter glass reactor (IKA Corporation (IKA)). After 5 minutes, the polymerization was stopped by adding 0.04 parts of trihexylamine. Produces branched polydimethylsiloxane polymers mixed with hydrocarbon oils.

example 2

[0127] By replacing the Hydroseal G 250H of Example 1 with Lytol supplied by Sonneborn TM (a white mineral oil) to prepare another branched polydimethylsiloxane, and the reaction time was 24 minutes.

[0128] example

example 3

[0130]The branched polymers of Examples 1 and 2 were used to prepare the emulsions. 200 g of the polymer blend from Example 1 or 2 were mixed with C12-13 Pareth-4 and C12-13 Pareth-23 in a SpeedMixer (TM) DAC 600 FVZ at 2700 rpm for 30 seconds. A total of 5% by weight of water was added and the contents were mixed for 2 minutes at 2700 rpm. The remainder of the water was added gradually and the contents were mixed at 2700 rpm for 30 seconds after each addition. The biocide was added and the contents were mixed for 30 seconds at 2700 rpm. Emulsion formulations and properties are listed in the table below. Emulsion particle size was measured using a Malvern Mastersizer (TM) 2000; volume averages are reported.

[0131] Product from Example 1

[0132] *Biocide: a mixture of 1.13 active weight % of 5-chloro-2-methyl-4-isothiazolin-3-one and 0.37 active weight % of 2-methyl-4-isothiazolin-3-one .

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PUM

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Abstract

The invention relates to branched organopolysiloxanes and emulsions thereof, and to methods of preparation and uses of the branched organopolysiloxanes and emulsions thereof. A branched organopolysiloxane is prepared by the reaction of a branching agent with a substantially linear organopolysiloxane containing at least one hydroxyl or hydrolysable group bonded to silicon, in the presence of an inert fluid and a catalyst, such as a phosphazene catalyst. Phosphazene catalysts also have the advantage that the content of undesired low molecular weight cyclic silicones in the polymerisation product is low.

Description

[0001] Cross references to related patent applications [0002] This patent application claims the benefit of US Provisional Patent Application No. 61 / 939865, filed February 14, 2014, the contents of which are incorporated herein by reference. technical field [0003] The present invention relates to branched organopolysiloxanes and emulsions thereof. The invention also relates to a process for the preparation of branched organopolysiloxanes and their emulsions and their use. Background technique [0004] Organopolysiloxanes have various uses, for example as sealants, defoamers, elastomers, pressure sensitive adhesives, or release agents. Organopolysiloxanes are useful in hair care and other personal care products, as well as in household care compositions. [0005] Silicone emulsions can be prepared by various methods such as (a) mechanical emulsification, or (b) emulsion polymerization. Mechanical emulsification requires homogenization of the oil phase (eg, silicone pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08G77/06C08G77/32C08L83/04
CPCC08G77/32C08L83/04C08G77/38A61K8/062A61K8/89A61Q5/00A61Q19/00C08J3/02C08J3/092A61K8/892A61Q5/06A61Q5/12C08L83/06C08L2201/52C08L2203/02
Inventor 塞维林·科万L·德克里派尔罗伯特·D·肯尼迪Y·刘
Owner DOW CORNING CORP