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US 5,401,839 AGranted
Process of preparing N-substituted aldonamides having improved color and color stability
AssigneeLever Brothers Company, Division of Conopco, Inc.
InventorsVan Au, Bijan Harirchian
Life of this patent
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Abstract
A process of preparing N-substituted aldonamides, the process including the steps of mixing and reacting an aldonolactone and an amine in an organic polar solvent, in the presence of an antioxidant and a reducing agent. The aldonamides have improved color; the discoloration or browning of the aldonamides upon storage or elevated temperature processing is eliminated or substantially minimized.
Claims21
A process of preparing an N-substituted aldonamide, the process comprising the steps of:
- i) preparing a homogeneous mixture comprising an aldonolactone, a reducing agent, an antioxidant, an organic polar solvent, and an amine HNR.sup.1 R.sup.2, wherein R.sup.1 and R.sup.2 are the same or different and may contain heteroatoms and are selected from the group consisting of hydrogen, an aliphatic hydrocarbon radical, an aromatic radical, a cycloaliphatic radical, an amino acid ester, an ether amine and mixtures thereof selected from the group consisting of oxygen, nitrogen and sulphur, except that R.sup.1 and R.sup.2 are not both hydrogen at the same time, wherein the molar ratio of the aldonolactone to the amine is in the range of from about 1.1:1 to about 1:1;
- and
- ii) reacting the homogeneous mixture at a temperature not greater than 65.degree. C. to obtain the aldonamide.
Dependencies are inferred from the claim text.