US 5,961,988 AGranted

Cosmetic and dermatological preparation based on magnetically hard particles

AssigneeLancaster Group GmbH

InventorsLeonhard Zastrow, Karin Golz-Berner, Doucet Olivier

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Abstract

The invention relates to a cosmetic and dermatological preparation for treating sensitive tissue, wounds and hair. The preparation contains (a1) magnetically hard particles such as barium or strontium hexaferrite single crystals, samariumcobalt particles (SmCo) and neodymium-iron-boron particles (Nd.sub.2 Fe.sub.14 B), each with a particle size in the range of 80 to 550 nm, and with a coercive field strength of the particles in the range of 1,000 to 20,000 Oerstedt; or (a2) particles according to (a1), encapsulated in aqueous liposomes or asymmetrical lamellar aggregates, where the aggregates consist of fluorocarbons and natural phospholipids with a phosphatidylcholine content of 30 to 99 wt %; and separately in addition to (a1) or (a2) or mixtures thereof, it also contains asymmetrical lamellar aggregates without encapsulated particles which are loaded with oxygen to the saturation limit. In addition, it also contains excipients and optionally other cosmetic or pharmacological active ingredients.

Claims10

Dependent claims

A cosmetic and dermatological preparation based on magnetically hard particles and asymmetrical lamellar aggregates consisting of phospholipids and fluorocarbons, comprising of

(a1) magnetically hard particles selected from the group consisting of barium hexaferrite single crystals, strontium hexaferrite single crystals, samarium-cobalt particles (SmCo) and neodymium-iron-boron particles (Nd.sub.2 Fe.sub.14 B), each with a particle size in the range of 80 to 550 nm, and the particles have a coercive field strength in the range of 1,000 to 20,000 Oerstedt;
or
(a2) magnetically hard particles according to (a1), encapsulated in aqueous liposomes or asymmetrical lamellar aggregates or a mixture of the two, where the asymmetrical lamellar aggregates consist of natural phospholipids with a phosphatidylcholine content of 30 to 99 wt % and fluorocarbons;
or a mixture of (a1) and (a2);
and
(b) separately in addition to (a1) or (a2) or mixtures thereof, it also contains asymmetrical lamellar aggregates consisting of fluorocarbons and natural phospholipids having a phosphatidylcholine content of 30 to 99 wt %, where the asymmetrical lamellar aggregates are charged with oxygen to the saturation partial pressure;
and
(c) cosmetic or dermatological excipients or carriers;
and optionally
(d) cosmetic or pharmacological active ingredients;
and where the amount of particles according to
(a1) or (a2) is in the range of 0.001 to 50 wt %,
(b) is in the range of 2.5 to 70 wt %,
(c) is in the range of 5 to 80 wt %, and optionally
(d) is in the range of 0.5 to 75 wt %, based on the total weight of the preparation.

12 more elements

Process for the manufacture of a preparation based on magnetically hard particles and asymmetrical lamellar aggregates consisting of phospholipids and fluorocarbons, comprising

(a1) preparing magnetically hard particles selected from the group consisting of barium hexaferrite single crystals, strontium hexaferrite single crystals, samarium-cobalt particles (SmCo) and neodymium-iron-boron particles (Nd.sub.2 Fe.sub.14 B), each with a particle size in the range of 80 to 550 nm, and with a coercive field strength of the particles in the range of 1,000 to 20,000 Oerstedt;
or
(a2) preparing magnetically hard particles according to (a1), encapsulated in aqueous liposomes or asymmetrical lamellar aggregates or a mixture of the two, where the asymmetrical lamellar aggregates consist of natural phospholipids with a phosphatidylcholine content of 30 to 99 wt % and fluorocarbons;
or preparing a mixture of (a1) and (a2);
and
(b) preparing separately in addition to (a1) or (a2) or mixtures thereof asymmetrical lamellar aggregates comprising fluorocarbons and natural phospholipids having a phosphatidylcholine content of 30 to 99 wt %, and
(b1) charging said additionally prepared asymmetrical lamellar aggregates with oxygen to the saturation partial pressure and than mixing it with the aggregates prepared according to (a2) or the mixture of (a2) and (a1);
or
(b2) mixing the aggregates prepared according to (a2) or the mixture of (a2) and (a1) with said aggregates prepared according to (b) and than charging both with oxygen to the saturation partial pressure;
and
introducing the mixture prepared according to (b1) or (b2) into a cosmetically or pharmacologically acceptable excipient (c) to form a dispersion;
and
with the optional addition of cosmetical or pharmacological active ingredients (d) to form said dispersion;
wherein the amount of particles according to
(a1) or (a2) is in the range of 0.001 to 50 wt %,
(b) is in the range of 2.5 to 70 wt %,
(c) is in the range of 5 to 80 wt %, and optionally
(d) is in the range of 0.5 to 75 wt %, based on the total weight of said dispersion.

15 more elements

Dependencies are inferred from the claim text.