Chemistry of carbon compounds – Dipeptides – e.g. – aspartame – anserine – carnosine – etc.
Patent
1974-05-28
1976-05-04
Sutto, Anton H.
Chemistry of carbon compounds
Dipeptides, e.g., aspartame, anserine, carnosine, etc.
260 25AJ, 260978, C07F 908, C08J 900
Patent
active
039549178
ABSTRACT:
Products which are phosphorus containing oligomers having ##EQU1## linkages between phosphorus atoms and which are obtained by the self-condensation of .beta.-haloalkyl esters of pentavalent phosphorus acids or by condensation of these esters with an alkyl ester of a pentavalent phosphorus acid are treated with an alcohol having the formula ROH wherein R is a C.sub.1 -C.sub.20 alkyl group or a substituted alkyl group and then with an alkylene oxide for a period of time after residual acidity has been neutralized, e.g., by treatment with an alkylene oxide, which is sufficient to enable the alcohol and the alkylene oxide to act upon labile groups contained in the condensed product and to neutralize any further acidity generated by the opening of such groups. The stabilized product formed by this process when incorporated in a polyurethane foam gives a foam having superior green strength to a foam containing a condensed oligomer which is not so treated.
REFERENCES:
patent: 3641202 (1972-02-01), Biranowski et al.
patent: 3822327 (1974-07-01), Weil
Honig Milton L.
Walsh Edward N.
Fennelly Richard P.
Stauffer Chemical Company
Sutto Anton H.
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