Surfactants

US5962626A · kind A · utility

Assignee

• NYCOMED IMAGING AS · NO

Inventors

• Per Strande · Oslo, NO
• Harald Dugstad · Oslo, NO
• Balin Balinov · Oslo, NO
• Jan A. Alfheim · Hagan, NO
• Joseph Arukwe · Oslo, NO

Key dates

• Filing date: Nov 25, 1997
• Grant date: Oct 5, 1999
• Expiry date: Nov 25, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K23/34
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The present invention provides a polyethylene glycol (PEG) ester surfactant comprising at least one polyethylene glycol moiety and at least one fatty acyl moiety characterized in that said moieties are linked by a linkage incorporating a biodegradable methylene diester unit of formula (I) EQU --CO.O.C(R.sup.1)(R.sup.2).O.CO-- (I) where R.sup.1 and R.sup.2 may, for example, each be a hydrogen atom or a monovalent organic group attached through a carbon atom or R.sup.1 and R.sup.2 together may, for example, form a divalent organic group attached through carbon atoms.