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US 9,844,500 B2Granted
Process for semi-permanent straightening of curly, frizzy or wavy hair
AssigneeKao Corporation
InventorAlderano Mannozzi
Life of this patent
Estimating the term…
Abstract
The process of the invention provides for a preventive hair treatment with buffering agent, in particular glyoxylic acid in combination with mechanical straightening with hair straightening iron at temperature of approximately 200° C.+/−50° C.
Claims6
A process for semi-permanent hair straightening, comprising
- a) applying a solution comprising glyoxylic acid at a pH of 1.5-2.1, wherein the hair is prewashed prior to said applying;
- b) keeping the solution in contact with hair for 15 to 120 minutes, wherein said keeping has an average duration of 60 minutes;
- c) drying the hair, and
- d) straightening the hair with a hair straightening iron at temperature of approximately 200+/−50° C.
- wherein the hair is human hair and said glyoxylic acid is dissolved in aqueous solution in ponderal ratio between 5% and 10% in weight.
2 more elements
Dependencies are inferred from the claim text.