Preparation of a self supporting cosmetic from a pigmented powder
US4724138A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1986 |
| Grant date | Feb 9, 1988 |
| Priority date | — |
| Expiry date | Nov 20, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S424/05
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Coherent powder compositions are formed by blending a powder phase containing at least 5 weight percent calcium sulfate hemihydrate with a liquid phase containing sufficient water to fully convert the hemihydrate to calcium sulfate dihydrate and drying the resultant blend. Uniformly pigmented products are formed by including a powdered pigment in the powder phase and 0.1 to 4.0 weight percent surfactant in the aqueous phase. Compositions suitable for use as cosmetic sticks are formed by employing at least 40 weight percent calcium sulfate hemihydrate. Preferably the products are formed by combining 40 to 60 parts by weight of aqueous phase with 50 parts by weight of powder phase. To improve pay-off characteristics the products are subjected to a temperature above 128.degree. C., the outer surface is abraded or up to 20 weight percent of the aqueous phase is glycerin or propylene glycol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.