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AssigneeAlbright & Wilson Limited
InventorsBrinley M. Phillips, Maurice E. Thompson, Alan J. Lambie
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The reaction of an imidazoline base of the formula: ##STR1## wherein R represents an aliphatic group comprising from 6 to 22 carbon atoms and R.sub.1 represents a substituted or unsubstituted alkyl or alkenyl group comprising 1 to 4 carbon atoms, with a carbo-alkylating agent is carried out in two stages. Initially the pH is maintained in the range 7 to 11 and subsequently it is maintained in the range 9 to 12.5. These conditions encourage at least part of the imidazoline to undergo alkylation followed by hydrolysis and further alkylation. The di alkylated amidoamines thus produced are believed to be novel. The reaction products are surfactants which exhibit very low skin irritancy and have a desirably low viscosity. They find particular application in shampoo formulations.
A process for the preparation of a surface active agent comprising a mixture containing mono- and dicarbo-alkylated derivatives of acylated ethylene diamines which comprises treating an imidazoline of the formula ##STR8## wherein R represents an aliphatic group comprising from 6 to 22 carbon atoms and R.sub.1 represents a substituted or unsubstituted alkyl or alkenyl group having from 1 to 4 carbon atoms with from 1 to 4 moles per mole of imidazoline of a carboalkylating agent of the formula Z-R.sub.2 -COO.sup.- wherein R.sub.2 represents a substituted or unsubstituted alkylene group having from 1 to 4 carbon atoms and Z represents a halogen atom characterized in that the reaction is carried out at a temperature of from 40.degree. to 90.degree. C., the pH of the reaction medium being maintained in the range 7.0 to 11.5 and after at least 0.5 mole of carbo-alkylating agent per mole of imidazoline have reacted the pH of the reaction medium is maintained in the range of more than 9 up to 12.0 to produce said mixture;
A surface active agent comprising a mixture containing mono- and di-carbo-alkylated derivatives of acylated ethylene diamines produced by the process which comprises treating an imidazoline of the formula ##STR9## wherein R represents an aliphatic group comprising from 6 to 22 carbon atoms and R.sub.1 represents a substituted or unsubstituted alkyl or alkenyl group having from 1 to 4 carbon atoms with from 1 to 4 moles per mole of imidazoline of a carboalkylating agent of the formula Z-R.sub.2 -COO.sup.- wherein R.sub.2 represents a substituted or unsubstituted alkylene group having from 1 to 4 carbon atoms and Z represents a halogen atom characterized in that the reaction is carried out at a temperature of from 40.degree. to 90.degree. C., the pH of the reaction medium being maintained in the range 7.0 to 11.5 and after at least 0.5 mole of carbo-alkylating agent per mole of imidazoline have reacted the pH of the reaction medium is maintained in the range 9.0 to 12.0 to produce said mixture;
Dependencies are inferred from the claim text.