The present invention relates to a general process for treating keratin substances, preferably keratin fibres, comprising the following steps: c) applying to the keratin substances a composition comprising at least one photo-crosslinkable polymer including at least one photo-dimerizable pendant group and at least one hydrophobic pendant group, and d) irradiating said composition on the keratin substances to crosslink the polymer.

The present invention relates to a general process for treating keratin substances, preferably keratin fibres, comprising the following steps: c) applying to the keratin substances a composition comprising at least one photo-crosslinkable polymer including at least one photo-dimerizable pendant group and at least one hydrophobic pendant group, and d) irradiating said composition on the keratin substances to crosslink the polymer.

Disclosed herein is an agent for shaping or altering the shape of hair, such as by straightening or relaxing hair, the agent comprising: A. a hair treatment composition containing an alkaline material selected from a hydroxide-containing compound and a carbonate compound; a cationic polymer selected from a quaternary diammonium polycondensate; an amphoteric polymer selected from a quaternary ammonium compound; an organic solvent, and water; and optionally, B. an activator component; wherein the pH of the composition is equal to or greater than 12 and wherein the weight ratio of (b) to (c) ranges from about 1 up to about 3.

Disclosed herein is an agent for shaping or altering the shape of hair, such as by straightening or relaxing hair, the agent comprising: A. a hair treatment composition containing an alkaline material selected from a hydroxide-containing compound and a carbonate compound; a cationic polymer selected from a quaternary diammonium polycondensate; an amphoteric polymer selected from a quaternary ammonium compound; an organic solvent, and water; and optionally, B. an activator component; wherein the pH of the composition is equal to or greater than 12 and wherein the weight ratio of (b) to (c) ranges from about 1 up to about 3.

A method of treating hair to reduce frizz involving the following steps: (i) prewashing the hair with water, (ii) applying a frizz reducing product to the hair using at least one of a brush and a spray, (iii) drying the hair in air, (iv) rinsing the hair with water, (v) drying the hair, (vi) applying to the hair a flat iron, and (vii) rinsing the hair with water. The frizz reducing agent used to treat hair is glyoxylic acid. The specific temperature the flat iron is set will depend on the specific hair type and degree of frizz.

A method of treating hair to reduce frizz involving the following steps: (i) prewashing the hair with water, (ii) applying a frizz reducing product to the hair using at least one of a brush and a spray, (iii) drying the hair in air, (iv) rinsing the hair with water, (v) drying the hair, (vi) applying to the hair a flat iron, and (vii) rinsing the hair with water. The frizz reducing agent used to treat hair is glyoxylic acid. The specific temperature the flat iron is set will depend on the specific hair type and degree of frizz.

A hair straightening or styling composition provided herein comprises: (i) citraconic acid; (ii) (a) a reducing agent and/or (b) an aldehyde, a thioacetal, a ketone or an alcohol; (iii) a buffering agent; (iv) an oxidizing agent; (v) optionally a carboxylic or dicarboxylic acid; and (vi) at least one solvent. Also provided herein is a method of straightening or styling hair using such composition.

A hair straightening or styling composition provided herein comprises: (i) citraconic acid; (ii) (a) a reducing agent and/or (b) an aldehyde, a thioacetal, a ketone or an alcohol; (iii) a buffering agent; (iv) an oxidizing agent; (v) optionally a carboxylic or dicarboxylic acid; and (vi) at least one solvent. Also provided herein is a method of straightening or styling hair using such composition.

The present invention relates to composition for hair or fiber comprising an alkyl ketene compound.

The composition according to the present invention includes an alkyl ketene compound capable of covalently bonding with a protein residue on a surface of hair or fibers, and the alkyl ketene compound can form a covalent bond with the hair or fiber to provide beneficial effects, such as long-lasting conditioning.

The present invention relates to processes for neutralizing relaxed hair. Still further, the present invention relates to neutralizer compositions for use on relaxed hair. Still further, the present invention relates to a system for neutralizing relaxed hair. Yet further, the invention relates to relaxed hair neutralized by the compositions and methods disclosed herein. The present invention also relates to compositions and methods to simultaneously neutralize and color relaxed hair.