Aqueous dispersions of silicone polyether block copolymers

• US 7,887,834 B2
• Filed: 04/19/2005
• Issued: 02/15/2011
• Est. Priority Date: 04/20/2004
• Status: Expired due to Fees

• Current Assignee: Dow, Inc.
• Original Assignee: Dow, Inc.
• Inventors: Lin, Shaow, Nguyen, Kimmai
• Primary Examiner(s): Gulakowski; Randy
• Assistant Examiner(s): LOEWE, ROBERT S
• Application Number:
  US10/594,399
• Publication Number:
  US 20070219318A1
• Time in Patent Office: 2,128 Days
• Field of Search: 525/94
• US Class Current: 424/450
• CPC Class Codes: A61K 8/671 Vitamin A; Derivatives thereof, e.g. ester of vitamin A acid, ester of retinol, retinol, retinal
• CPC Class Codes: A61K 8/894 modified by a polyoxyalkylene group, e.g. cetyl dimethicone copolyol
• CPC Class Codes: A61Q 19/00 Preparations for care of the skin
• CPC Class Codes: C08G 77/46 containing polyether sequences
• CPC Class Codes: C08L 83/12 containing polyether sequences

Abstract

Aqueous dispersions of (AB)_n silicone polyether block copolymers, methods for preparing the dispersion compositions, and personal, household, and healthcare formulations containing the compositions are disclosed. The aqueous dispersions can be either vesicle or emulsion compositions depending on the (AB)_n silicone polyether block copolymers structure and method of preparing the dispersion.

Claims

1. A process for making an aqueous composition consisting of;

I) combining,

A) 2 to 50 wt % of an (AB)_n block silicone polyether copolymer having the average formula;

—

[R¹(R₂SiO)_x(R₂SiR¹O)(C_mH_2mO)_y]_z—

where x ranges from 30 to 75, y is greater than 4, the value of x/(x+y) ranges from 0.2 to 0.9, m is from 2 to 4 inclusive,

z is greater than 2,

R is independently a monovalent organic group,

R¹ is a divalent hydrocarbon containing 2 to 30 carbons,

B) 2 to 30 wt % of a water miscible volatile solvent selected from methanol, ethanol, isopropanol, or propanol,

with sufficient amounts of water to provide the sum of the wt % of A), B), and water to equal 100% to form an aqueous dispersion,

II) mixing the aqueous dispersion to form vesicles of

the (AB)_n silicone polyether copolymer having an average particle size of less than 10 micrometers,

III) optionally removing the water miscible volatile solvent from the aqueous dispersion.