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AssigneeUniversity of Leeds
InventorsDavid Malcolm Lewis, Juning Yao, Jerry S. Knapp, Jamie Anthony Hawkes
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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 R2 independently represents a hydrogen atom or an alkyl group; and m=0 to 30. The method provides effective bleaching agents and r sterilizing agents an 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 —OOH, and hydrogen peroxide or per hydroxy anion or a precursor therefor. 1
A method of treatment of a material, comprising contacting said material with a percarbamic acid and/or diacyl percarbamate, having the formula
A method as claimed in any preceding claim, wherein the method of treatment is carried out in the pH range 3 to 11.
A method as claimed in any preceding claim, wherein the method of treatment is carried out at a temperature in the range 0° C. to 95° C.
A method as claimed in any preceding claim, wherein the material to be treated is an organic fibre, such as cellulose, lignin and hair, an inorganic fibre, a textile material such as cotton, wool and synthetic textiles, a metal surface, a wood surface, a ceramic surface, a plastics surface, a liquid, or an aqueous liquid.
A method as claimed in any preceding claim, wherein the method is a method of bleaching.
A method as claimed in any preceding claim, wherein the percarbamic acid and/or diacyl percarbamate is generated in situ.
9 A method as claimed in any preceding claim, wherein L is selected from a phosphonate, phosphinate, thiourea or quaternary ammonium group;
A method as claimed in claim 9, wherein L has the formula —SX where X represents a cyano group, an optionally substituted C1-6 alkyl group or SO3M, where M represents a hydrogen atom, an alkali metal atom, or an ammonium group.
A method as claimed in claim 9, wherein L is —OX′ where X′ represents an optionally substituted alkyl group, an optionally substituted aryl group or an optionally substituted alkylcarbonyl group, or a group —CHO or —OCN.
A method as claimed in claim 9, wherein L is —O —PhSO3M, where M is a hydrogen atom, an alkali metal atom, or an ammonium group.
A method as claimed in claim 9, wherein L is —NX″X′″ where X″ and X′″ may both be alkyl groups or X′″ may be a hydrogen atom and X′″ may be a cyano, alkyl, hydroxyl, amido, amino, aminosaccharide or polyaminosaccharide group.
A method as claimed in claim 9, wherein L is of formula —P(═O)R′R″ where R′ represents a hydroxyl group and R″ represents hydrogen or hydroxyl group or amido group.
A method as claimed in claim 9, wherein L is Q+ connected to the C═O group by an N+ atom, the group Q being a quaternary ammonium moiety formed from a tertiary amine, or a heteroaryl or non-aromatic heterocyclic group.
A method as claimed in claim 9, where L is a group selected from the following:
A method as claimed in any preceding claim, in which R represents hydrogen, wherein the compound of formula (II) is prepared by a reaction employing an alkali metal or an ammonium cyanate and a compound HL where L is a moiety displacable by the perhydroxy anion.
A washing or bleaching or sterilizing or bactericidal composition comprising a compound of formula (II) as defined in any preceding claim and hydrogen peroxide or the perhydroxy anion or a precursor therefor.
A compound of formula
Dependencies are inferred from the claim text.