Non-greasy petrolatum emulsion

• US 5,387,417 A
• Filed: 08/22/1991
• Issued: 02/07/1995
• Est. Priority Date: 08/22/1991
• Status: Expired due to Fees

• Current Assignee: Dow, Inc.
• Original Assignee: Dow, Inc.
• Inventors: Rentsch, Stefan F.
• Primary Examiner(s): Page, Thurman K.
• Assistant Examiner(s): Hulina, Amy
• Application Number:
  US07/751,361
• Time in Patent Office: 1,265 Days
• Field of Search: 424/401, 424/78, 514/937, 514/938, 514/941, 514/844, 514/847
• US Class Current: 424/401
• CPC Class Codes: A61K 2800/262 Transparent; Translucent
• CPC Class Codes: A61K 8/064 Water-in-oil emulsions, e.g. Water-in-silicone emulsions
• CPC Class Codes: A61K 8/31 Hydrocarbons
• 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

Abstract

This invention relates to an improved skin care composition for moisturizing and conditioning the skin. In particular, it relates to a cosmetically acceptable, translucent skin conditioning lotion having an emulsified petrolatum base. The emulsions of the present invention are prepared using a crosslinked organopolysiloxane-polyoxyalkylene emulsifier and involve matching the refractive indices for the continuous and discontinuous phases.

Claims

1. An emulsion comprising 1-75 percent by weight of a discontinuous phase comprising a polar liquid;

and 5-50 percent by weight of a continuous phase comprising petrolatum, 1-20 percent by weight of a cyclic polydimethylsiloxane fluid, and 0.2-9 percent by weight of a crosslinked emulsifier in which at least two organopolysiloxane-polyoxyalkylene molecules are crosslinked by a crosslinking radical;

the discontinuous phase and the continuous phase having refractive index measurements which are matched within 0.01 to provide translucency, the crosslinked organopolysiloxane-polyoxyalkylene emulsifier having the formula;

##STR7## wherein R is an aliphatic radical having 2to 25 carbon atoms;

R'"'"' is an organic or organosiloxane group which does not contain bydrolyzabe bonds;

R" is a terminal group;

R"'"'"' is independently an aliphatic radical having 1 to 25 carbon atoms;

R₁ is independently selected from the group consisting of hydrogen and an aliphatic radical containing 1-3 carbon atoms;

x is an integer from 0 to 100;

c is an integer from 1 to 5;

z is an integer from 0 to 600;

y is an integer from 1 to 10;

x+y+z>

40;

a is an integer from 4 to 40;

b is an integer from 0 to 40;

a/b>

1, and in which the cyclic polydimethylsiloxane fluid has the formula [(CH₃)₂ SiO]_x wherein x is an integer having a value of 3-6.

2. An emulsion according to claim 1 in which the continuous phase includes a non-crosslinked emulsifier which is a polydiorganosiloxane-polyoxyalkylene copolymer containing at least one polydiorganosiloxane segment and at least one polyoxyalkylene segment.

3. An emulsion according to claim 1 in which the continuous phase includes a silicone gum having a viscosity of 500,000-100,000,000 centistokes measured at twenty-five degrees Centigrade.

4. An emulsion according to claim 2 in which the continuous phase includes a silicone gum having a viscosity of 500,000-100,000,000 centistokes measured at twenty-five degrees Centigrade.