Surfactants
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United States of America Patent
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Oct 5, 1999
Grant Date -
N/A
app pub date -
Nov 25, 1997
filing date -
Nov 25, 1996
priority date (Note) -
Expired
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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) --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.
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