The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 15, 1986
Filed:
Dec. 14, 1984
Lothar Brandt, Wiesbaden, DE;
Utz-Hellmuth Felcht, Bad Soden-Neuenhain, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
The invention relates to novel water-soluble mixed ethers of .beta.-cyclodextrin (.beta.-CD) with ether substituents comprising (C.sub.1 and C.sub.2) alkyl, hydroxy(C.sub.2 to C.sub.4)alkyl and carboxy(C.sub.1 and C.sub.2)alkyl such as methylhydroxyethyl-.beta.-CD or hydroxyethyl-carboxy-methyl-.beta.-CD; hydroxyethyl-hydroxy propyl ethers are excepted. The process of the invention comprises reacting .beta.-cyclodextrin with at least two different alkylating, hydroxyalkylating and/or carboxyalkylating etherifying agents (for example, methyl chloride, ethylene oxide and/or chloroacetic acid) in a basic, liquid reaction medium containing an alkali-metal hydroxide, water and, optionally, at least one organic solvent (for example, dimethoxyethane or isopropanol).