Modified polyethylenephosphinic acids and their salts
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United States of America Patent
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Mar 25, 2008
Grant Date -
Feb 1, 2007
app pub date -
Sep 29, 2006
filing date -
Mar 4, 2003
priority date (Note) -
Expired
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Abstract
The invention relates to polymeric phosphinic acids and their salts of the formula (I) ##STR00001## where X is hydrogen or 1/m of a metal of valency m, or is a protonated nitrogen base, R.sub.1 and R.sub.2 are identical or different and are hydrogen, a carboxy group, a carboxylic acid derivative, an unsubstituted or substituted alkyl group having from 1 to 10 carbon atoms, phenyl, benzyl, or alkyl-substituted aromatic systems, R.sub.3 and R.sub.4 may be identical or different and are an unsubstituted or substituted alkyl group having from 2 to 20 carbon atoms, or are OX, with the above meaning for X, and is the average number of monomer units.The invention further relates to a process for preparing the abovementioned compounds, and to their use.
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