Perachem Limited

University of Leeds

Jamie Anthony Hawkes

David Malcolm Lewis

John Mama

Paul Webb

Andrew Edward Bayliff

Céline Gauché

Celine Gauche

Jiming Yao

Céline Gauché´

Jerry S Knapp

Céline GauchÉ

Andrew Bayliff

A coloring composition comprising: (i) at least 0.0001 wt % of a water-soluble dye compound containing one or more sulfonate and/or carboxylate groups; (ii) at least 0.1 wt % urea; (iii) from 0.1 to 2.5 wt % of a thiol; (iv) less than 0.5 wt % ammonia; and (v) less than 0.5 wt % sulfite ions.

Hair treatment methods

A method of treating a material, the method comprising the steps of: (i) contacting the material with a coloring composition comprising a dye compound; and (ii) contacting the material with a composition comprising a quaternary ammonium salt.

A depilatory composition comprising a source of cyanate ion, an organic acid or a salt thereof and a peroxide compound; and methods of removing hair from the skin using such compositions.

Composition and method

A method of treating a material, the method comprising applying to the material a composition comprising at least 10 wt % of ammonium carbonate, ammonium carbamate or a mixture thereof; and a source of hydrogen peroxide.

Bleaching methods and compositions

Flame-retardant composition containing a first component selected from phosphorous acid or a salt of phosphorous acid and a second component selected from an isocyanic acid, an isocyanic acid precursor, a cyanate salt, a thiocyanate salt or isothiocyanic acid precursor, dicyandiamide, cyanamide or carbodiimide precursor.

Phosphorus-contaning flame-retardant compositions

A method of treating a material to improve flame retardancy, the method comprising applying to the material urea, phosphorous acid or a salt thereof, and a base comprising a monovalent metallic cation.

Method and composition

A method of colouring a material, the method comprising the steps of: a)applying to the material a composition comprising a sulphur-containing nucleophile; and b)applying to the material a composition comprising a dye compound selected from a dye class other than the class of reactive dyes.

In one embodiment, the invention provides a method of removing color from dyed hair, the method comprising applying to the hair a color removal composition comprising a sulfur-containing nucleophile or a precursor thereof.

Hair treatment composition and methods

wherein D is a chromophore; L is a linking group selected from SO, NHCO, and NHSO; Q is a hydrogen or halogen atom; and R is selected from C-Calkyl, (CH)COOH, (CH)CONH, (CH)SOH, (CH)COOM, (CH)POH, (CH)OH, (CH)SSO&#x2033;, (CH)NR, (CH)NRH, (CH)NHCOR, PhSSO&#x2033;, PhSOH, PhPOH, PhNR, PhNR, (CH)CH(SH)R(CH)COOH, and n is an integer in the range of 1 to 4 wherein within the same molecule each n is not necessarily the same integer; M is a cation of an alkaline earth metal, alkali metal, NH4+ or NR; and Ris C-Calkyl. 

The invention provides a method of treatment of a material, comprising contacting said material with a percarbamic acid and/or diacyl percarbamate. Preferably the percarbamic acid has formula (I), where R represents an optionally substituted alkyl, aryl, heteroaryl, cycloalkyl or non-aromatic heterocyclic group, a hydrogen atom, or a group having formula (1a), where each Rindependently represents a hydrogen atom or an alkyl group; and m=0 to 30. The method provides effective bleaching agents and resterilizing agents and or bacteriocidal agents over a wide range of pH and temperatures, for a wide range of applications. Compositions comprise formula (II), whereby R is H or alkyl and L is a moiety displaced by &#x2014;OOH, and hydrogen peroxide or per hydroxy anion or a precursor therefor 

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Leeds, United Kingdom

Jamie Anthony Hawkes