Organic compounds -- part of the class 532-570 series – Organic compounds – Heavy metal containing
Patent
1995-06-15
1999-02-16
Shaver, Paul F.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heavy metal containing
556405, 556 14, 556 24, 556174, 2523151, 252 70, 252166, 252 83, 424 701, 424 704, 424 7012, 260665R, C07F 708
Patent
active
058722726
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to polyvalent metal salts of a phosphoric diester or organo(poly)siloxanes modified with a polyvalent metal salt of a phosphoric diester which are useful as starting materials in the manufacture of perfumery and cosmetic compositions. The present invention also relates to processes for manufacturing the salts or the organo(poly)siloxanes, gelling agents containing the same and cosmetic compositions containing the same, which provide excellent sensation during use and have a good stability.
DESCRIPTION OF THE RELATED ART
Conventional oil-based cosmetic compositions are either in a liquid state or in a solid (wax) state, and therefore, they entail drawbacks in handling, such as running of liquid and difficulty in taking out the content from the container. These drawbacks would be overcome by the use of gelling agents which are capable of providing oil-based cosmetic compositions with proper viscosity. From this point of view, many approaches have been proposed to apply materials known as oil gelling agents to cosmetic compositions.
Among such gelling agents, metallic soap, dextrin fatty acid esters, metal salts of dialkyl phosphoric esters and the like involve drawbacks in that they become brittle and hard gels when they are cooled down at a temperature not higher than a phase inversion temperature (hereinafter referred to as Tc) after heated and dissolved in oil, and the gels cannot be recovered upon stress. In order to recover the gels, it was necessary to heat them again at a temperature not lower than Tc. To obtain thixotropy sufficient for overcoming this problem, use of compounds having a short-chain branched alkyl group and having a Tc not higher than room temperature is suggested. However, gels of such compounds are highly viscous and have spinnability, resulting in very sticky cosmetic compositions which also raise drawbacks in handling. Organic modified bentonites are capable of imparting sufficient thixotropy to oil-based cosmetic compositions, which however, raise problems in that the additives in the cosmetic composition are freeing, and gels having softness and elasticity are not formed.
Accordingly, development of cosmetic compositions which have sufficient thixotropy, are easy to handle, stable and provide excellent sensation during use has still been desired.
Silicones are known to be resistant against heat, acidity, weather and the like, due to the high bonding energy of its backbone chain. They are also known to have properties of easy release from molds, high lubricity and water repellency due to their low surface tension. Furthermore, small intermolecular force of silicones results in an elastic backbone chain, achieving high gas permeability, and physiologically inert property of silicones features low toxicity and low irritability. Accordingly, silicones have conventionally been utilized in a variety of fields including electric, electronics, automobiles, machines, medicines, cosmetics, fibers, papers, pulps, building materials, and the like.
Especially in the fields of perfumery and cosmetic compositions, dimethylpolysiloxanes and cyclic silicones are actively incorporated into styling agents for the hair and cosmetic compositions as an oil ingredient due to their stickiness-free property and safety. Thus, technology of taking advantage of excellent characteristics of silicone oils and development of their use especially in perfumery and cosmetic compositions have been continued.
Although silicone oils are an important material as a component of perfumery and cosmetic compositions, they still involve problems in manufacturing products of enhanced functions. For example, silicone oils do not have good compatibility with other cosmetic oil base. Accordingly, uniform solutions and stable products having a silicone oil base are difficult to obtain. That is, silicone oils easily leach out and cause separation. Moreover, since there are no agents that are capable of controlling the viscosity of silicone oils, cosmetic compositions containing
Akaogi Akira
Fujikura Yoshiaki
Fukasawa Junichi
Ihara Takeshi
Kawasaki Hironori
Kao Corporation
Shaver Paul F.
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