Process for preparing a finely divided pulverous carotenoid retinoid or natural colourant preparation
US6406735B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1999 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Feb 22, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA23L5/44
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of a pulverous preparation having a finely divided carotenoid, retinoid or natural colorant is provided, which process comprises the steps of:a) forming a suspension of the active ingredient in a water-immiscible organic solvent optionally containing an antioxidant and/or an oil;b) feeding the suspension of step a) to a heat exchanger;c) heating the suspension to 100-250° C., whereby the residence time in the heat exchanger is less than 5 sec to provide a solution;d) rapidly mixing the solution of step c) with an aqueous solution of a swellable colloid and optionally a stabilizer such that the resulting mixture is at a temperature in the range of 20-100° C.;e) removing the organic solvent; andf) converting the dispersion of step e) into a pulverous preparation;where steps b) to f) are carried out continuously and in sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.