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Use of hydrophilic-rich alkylmethylsiloxane-dimethylsiloxane-polyoxyalkylene copolymers as emulsifiers for the preparation of cosmetic o/w emulsions of improved aesthetic properties and mildness

a technology of polyoxyalkylene and polymethylsiloxane, which is applied in the field of new hydrophilic-rich organomethylsiloxanedimethylsiloxanepolyoxyalkylene copolymers, can solve the problems of unrecognized use of oh terminal oxyalkylene polyethers, and difficulty in achieving stable disper

Inactive Publication Date: 2007-11-15
SILVER MICHAEL E
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The patent describes a new type of silicone copolymer that has a unique combination of properties. These copolymers are easy to mix with water and form a stable dispersion, like other silicone copolymers. However, they also have some organo-functional properties, making them different from other silicone copolymers. When used in cosmetic formulations, these copolymers improve the texture, feel, and aesthetics of the product. They also have increased mildness and are less toxic."

Problems solved by technology

The similar preparation of silicone copolyols that employ polyoxyalkylene but that is allyl terminated at one end and OH terminated at the other end is more problematic.
These crosslinking reactions are catalyzed by platinum catalysts such as chloroplatininc acid (H2PtCl6.6H2O), and lead to a generally undesired increase in viscosity of the final product and / or eventual gellation.
This reference, however, utilizes alkoxy endblocked polyethers in the hydrosilation reaction and does not disclose the use of OH terminal oxyalkylene polyethers.

Method used

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  • Use of hydrophilic-rich alkylmethylsiloxane-dimethylsiloxane-polyoxyalkylene copolymers as emulsifiers for the preparation of cosmetic o/w emulsions of improved aesthetic properties and mildness
  • Use of hydrophilic-rich alkylmethylsiloxane-dimethylsiloxane-polyoxyalkylene copolymers as emulsifiers for the preparation of cosmetic o/w emulsions of improved aesthetic properties and mildness
  • Use of hydrophilic-rich alkylmethylsiloxane-dimethylsiloxane-polyoxyalkylene copolymers as emulsifiers for the preparation of cosmetic o/w emulsions of improved aesthetic properties and mildness

Examples

Experimental program
Comparison scheme
Effect test

example 4

Copolymer where R Dodecyl, R′═H, x=18, y=5, z+q=4, q≦0.8, p=12

[0053]

[0054] Previously nitrogen saturated 1-dodecene (82.58 g, 0.491 mol), silanic hydrogen intermediate Example 1 (200.0 g, 0.0981 mol), and allyl / OH-PEO-12 (92.11 g, 0.157 mol) were combined in a Parr Model 4511 reactor and the head space was purged with nitrogen. The mixture was then stirred and heated to 85° C., whereupon the reactor was opened to allow for the injection of Pt catalyst (192.2 μL of a freshly prepared 0.050 M solution of H2PtCl6.6H2O in isopropyl alcohol). The reactor was sealed and the head space again purged with nitrogen while stirring was initiated, resulting in an exotherm leading to a rapid approximate35° C. increase in temperature. After 43 minutes, the reactor was opened and nitrogen saturated allyl / OH-PEO-12 (138.17 g, 0.235 mol) and additional Pt catalyst (70.7 μL) were added. The reactor was resealed and the stirred reaction allowed continued for an additional 67 minutes. By this time the ...

example 5

Copolymer where R=Dodecyl, R′═H, x=18, y=6, z+q=4, q≦0.8, p=12

[0055]

[0056] Previously nitrogen saturated 1-dodecene (111.08 g, 0.660 mol), silanic hydrogen intermediate Example 2 (230.82 g, 0.110 mol), and allyl / OH-PEO-12 (103.22 g, 0.176 mol) were combined in a Parr Model 4511 reactor and the head space was purged with nitrogen. The mixture was then stirred and heated to 85° C., whereupon the reactor was opened to allow for the injection of Pt catalyst (215.3 μL of a freshly prepared 0.050 M solution of H2PtCl6.6H2O in isopropyl alcohol). The reactor was sealed and the head space again purged with nitrogen while stirring was initiated, resulting in an exotherm leading to a rapid approximate 50° C. increase in temperature. After 30 minutes, the reactor was opened and nitrogen saturated allyl / OH-PEO-12 (154.88 g, 0.264 mol) and additional Pt catalyst (92.3 μL) were added. The reactor was resealed and the stirred reaction allowed continued for an additional 30 minutes. By this time t...

example 6

Copolymer where R Dodecyl, R′=Me, x=18, y=5, z+q 4, q≦0.8, p=12

[0057]

[0058] Previously nitrogen saturated 1-dodecene (82.58 g, 0.491 mol), silanic hydrogen intermediate Example 1 (200.0 g, 0.0981 mol), and allyl / OMe-PEO-12 (94.31 g, 0.157 mol) were combined in a Parr Model 4511 reactor and the head space was purged with nitrogen. The mixture was then stirred and heated to 85° C., whereupon the reactor was opened to allow for the injection of Pt catalyst (186.1 μL of a freshly prepared 0.050 M solution of H2PtCl6.6H2O in isopropyl alcohol). The reactor was sealed and the head space again purged with nitrogen while stirring was initiated, resulting in an exotherm leading to a rapid approximate 42° C. increase in temperature. After 30 minutes, the reactor was opened and nitrogen saturated allyl / OMe-PEO-12 (141.50 g, 0.235 mol) and additional Pt catalyst (79.7 μL) were added. The reactor was resealed and the stirred reaction allowed continued for an additional 60 minutes. By this time ...

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Abstract

This invention relates to the use of hydrophilic-rich, rake-type alkylmethylsiloxane-dimethylsiloxane-polyoxyalkylene copolymers.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of co-pending U.S. application Ser. No. 10 / 891,438, filed Jul. 14, 2004, which claims the benefit of U.S. Provisional Application Ser. No. 60 / 487,179 filed Jul. 14, 2004, and U.S. Provisional Application Ser. No. 60 / 513,136 filed Oct. 21, 2003, all of which are hereby incorporated herein by reference in their entirety.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The invention present invention relates to novel, hydrophilic-rich organomethylsiloxane-dimethylsiloxane-polyoxyalkylene copolymers and to their use as emulsifiers for the preparation of cosmetic emulsions of improved aesthetic properties and mildness. [0004] 2. Background Art [0005] An emulsion is a dispersion of droplets of one liquid in a second, immiscible liquid. [0006] The process of dispersing one liquid in a second immiscible liquid is called emulsification. [0007] An emulsifier is required to stabilize an emulsi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K31/74A61Q19/00
CPCA61K8/06A61K8/062A61K8/894A61Q19/00A61Q1/14A61Q17/04A61K31/74C08G77/50
Inventor SILVER, MICHAEL E.
Owner SILVER MICHAEL E
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