Hard capsules comprising polymers of vinyl esters and polyethers, their use and production

US6783770B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Maximilian Angel · Mutterstadt, DE
• Karl Kolter · Ludwigshafen am Rhein, DE
• Axel Sanner · Bischofswerda, DE
• Michael Gotsche · Aachen, DE

Key dates

• Filing date: Mar 20, 2001
• Grant date: Aug 31, 2004
• Expiry date: Mar 20, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F283/06
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The present invention relates to hard capsules comprising(A) polymers obtainable by free-radical polymerization ofa) at least one vinyl ester in the presence ofb) polyether-containing compounds andc) where appropriate one or more other copolymerizable monomers c) and subsequent at least partial hydrolysis of the ester functions in the original monomers a),with the proviso that in the absence of another copolymerizable monomer c) the polyether-containing compound b) must have a number average molecular weight ≦10,000,(B) where appropriate structure-improving auxiliaries and(C) other conventional shell constituents, the production and use thereof.