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Particulate compositions and their use in personal care products

IP.com Disclosure Number: IPCOM000012080D
Publication Date: 2003-Apr-07

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed are a method of modulating fluctuations in the surface temperature of the body or a part thereof, comprises application of a personal care or cosmetic formulation that contains an effective amount of a microencapsulated phase change material to at least a part of said body, and personal care or cosmetic compositions that contain said materials. Preferably the capsule shell material is a reaction product of methacrylic acid and at least one alkyl ester of (meth)acrylic acid which forms a homopolymer having a glass transition temperature in excess of 60° C and having microencapsulated within a hydrophobic phase change material, such as one or more paraffinic hydrocarbons, which undergoes a phase change from solid to liquid at a temperature from about 25 to 39° C.

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Particulate compositions and their use in personal care products

FIELD OF THE INVENTION

This invention relates to compositions containing energy absorbing and releasing temperature stabilizing microencapsulated phase change materials and their use in personal care applications.

BACKGROUND OF THE INVENTION

Generally speaking, phase change materials are substances that have the capability of absorbing or releasing thermal energy in order to reduce or eliminate heat transfer at the temperature stabilizing range of the particular temperature stabilizing material.  A phase change material will reduce or stop the flow of thermal energy through a substrate during the time it is absorbing or releasing heat, typically during the material’s change of phase.  This action is transient, i.e., the phase change material will be effective as a barrier to thermal energy until the total latent heat of the temperature stabilizing material is absorbed or released during the heating or cooling process.  Changes in the local environment can result in thermal energy being stored or removed from the phase change material, and the phase change material can effectively be recharged by a source of heat or cold. 

U.S. Patent 5,290,904 describes improved heat shields comprising two covering layers of a nonflammable, flexible material such as aluminized Mylarâ with a thin thermal energy absorbing material sandwiched between them.  The thermal energy absorbing material may comprise a bulk-phase change material, or a phase change material embedded in a solidifiable base such as a silicone rubber binder, or it may comprise a macro- or microencapsulated phase change material used in bulk or in combination with the solidifiable base. 

While the objective of U.S. Patent 5,290,904 is to protect persons or property from the detrimental effects of fire, incorporation of microencapsulated phase change materials into fabrics used to manufacture articles of clothing such as gloves and ski apparel is also known.  For example U.S. Patent 4,756,958 describes fibers impregnated with microspheres filled with phase change materials.  The fibers may be woven into fabrics having enhanced thermal storage properties that may be used to make articles of clothing.  The function of the phase change materials in the articles of clothing is to regulate body temperature by absorbing or releasing body heat as needed to reduce temperature extremes.  This also seems to be the intent of the foam-coated fabrics in U.S. Patent 5,677,048.

EP 1 201 220 A1 discloses the use of certain thermally stable microcapsules to protect cosmetic or pharmaceutical compositions against the effects of thermal variations.

It has now been found that certain microencapsulated phase change materials, instead of being incorporated into fibers or embedded into a polymeric binder, when incorporated into personal care compositions, particularly into personal care and cosmetic compositions that are applied to the skin, will mo...