Method of making siloxane-based polymides

a technology of siloxane and polyamide, which is applied in the field of making siloxane-based polyamides, can solve the problems of difficult to produce in commercial quantities, prohibitive cost of products,

Inactive Publication Date: 2003-05-06
DOW CORNING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This invention relates to a method of forming a siloxane-based polyamides which are useful as thickening agents to formulate a wide var

Problems solved by technology

The process according to the '709 application involves many steps, and this results

Method used

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  • Method of making siloxane-based polymides
  • Method of making siloxane-based polymides
  • Method of making siloxane-based polymides

Examples

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example 1

30 DP Polymer

A 500 ml three neck flask equipped with a thermometer, electrical stirrer, nitrogen sweep, and a condenser, was charged with 50.12 g of undecylenic acid, and 22.58 g of a 70% hexamethylene diamine mixture in water. The flask was immediately heated to 225 degrees C. and kept at this temperature for 2 hours. After 2 hours, a vacuum was applied to the system for 2 hours to remove any unreacted materials. Upon completion of vacuum stripping, the flask was reweighed to obtain the product weight. The temperature was increased to 120 degrees C., and 65 g of toluene, complex of platinous chloride and divinyl tetramethyl disiloxane, were added to the flask. The temperature was increased to 185 degrees C., and 279.2 g of a 30 DP dimethylhydrogen endblocked polydimethylsiloxane was added to the flask over a 30 minute period. After complete addition, a dean stark trap was used to replace the addition funnel on the flask, and the toluene was removed from the flask. After removal of ...

example 2

20 DP Polymer

A 500 ml three neck flask equipped with a thermometer, electrical stirrer, nitrogen sweep, and a condenser, was charged with 55.0 g of undecylenic acid, and 24.77 g of a 70% hexamethylene diamine mixture in water. The flask was immediately heated to 225 degrees C., and kept at this temperature for 2 hours. After 2 hours, a vacuum was applied to the system for 2 hour to remove any unreacted materials. Upon completion of vacuum stripping, the flask was reweighed to obtain the product weight. The temperature controller was increased to 120 degrees C., and 65 g of toluene, and 0.5 g of a solution containing platinum in the form of a complex of platinous chloride and divinyl tetramethyl disiloxane, were added to the flask. The temperature was then increased to 185 degrees C., and 222.0 g of a 20 DP dimethylhydrogen endblocked polydimethylsiloxane was added to the flask over a 30 minute period. After complete addition, a dean stark trap was used to replace the addition funnel...

example 3

15 DP Polymer

A 500 ml three neck flask equipped with a thermometer, electrical stirrer, nitrogen sweep, and a condenser, was charged with 57.75 g of undecylenic acid, and 24.77 g of a 70% hexamethylene diamine mixture in water. The flask was immediately heated to 225 degrees C., and kept at this temperature for 2 hours. After 2 hours, a vacuum was applied to the system for 2 hours to remove any unreacted materials. Upon completion of vacuum stripping, the flask was reweighed to obtain the product weight. The temperature was increased to 120 degrees C., and 65 g of toluene, and 0.5 g of a solution containing platinum in the form of a complex of platinous chloride and divinyl tetramethyl disiloxane were added to the flask. The temperature was then increased to 185 degrees C., and 168.72 g of a 15 DP dimethylhydrogen endblocked polydimethylsiloxane was added to the flask over a 30 minute period. After complete addition, a dean stark trap was used to replace the addition funnel on the f...

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Abstract

A method of making siloxane-based polyamides which includes at least one repeating unit represented by the formulawherein X is a linear or branched C1-C30 alkylene chain; Y is a linear or branched C1-C20 alkylene chain; DP is an integer having a value of 10-500; n is an integer having a value 1-500. The method involves heating an intimate reaction mixture containing an olefinic acid and an organic diamine at a temperature greater than 100° C. and forming an organic diamide; and thereafter reacting the organic diamide with a hydride-terminated polydimethylsiloxane in the presence of a hydrosilylation catalyst to form the siloxane-based polyamide.

Description

CROSS-REFERENCE TO RELATED APPLICATIONSNot applicable.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENTNot applicable.REFERENCE TO A MICROFICHE APPENDIXNot applicable.FIELD OF THE INVENTIONThis invention is directed to an improvement in the method of making siloxane-based polyamides described in a prior copending application, U.S. Ser. No. 08 / 904,709, filed Aug. 1, 1997, and entitled "Cosmetic Composition Containing Siloxane-Based Polyamides as Thickening Agents", hereafter referred to as the '709 application.BACKGROUND OF THE INVENTIONThe present invention relates to a novel method of making siloxane-based polyamides.There is a growing demand in the personal care arena for polymeric materials capable of thickening dimethylcyclosiloxanes in order to modify product viscosity in various market niche hair, skin, cosmetic, and underarm, applications.The '709 application is directed to one type of a process for preparing siloxane-based polyamides. The process according to t...

Claims

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Application Information

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IPC IPC(8): A61K8/72A61K8/895A61Q19/00C08G69/00C08G69/42C08G77/00C08G77/455C08G77/26A61K8/898
CPCA61K8/898A61Q5/00A61Q19/00C08G69/42C08G77/455
Inventor PETROFF, LENIN JAMESROSE, JAY BRIANSKINNER, MICHAEL WARD
Owner DOW CORNING CORP
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