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Yeadon, United Kingdom

Patent
PERACHEM Ltd | Date: 2011-01-24

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.


Patent
PERACHEM Ltd | Date: 2013-03-22

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


Patent
Perachem Ltd | Date: 2012-07-27

A method of removing colour from hair that has been oxidatively dyed, the method comprising the steps of: (a) contacting the hair with a composition comprising a sulfur-containing nucleophile or a precursor thereof; (b) contacting the hair with an acidic composition; and (c) contacting the hair with an oxidising composition; wherein there is no rinsing step between step (a) and step (b).


Patent
Perachem Ltd | Date: 2015-05-27

A method of treating a wool material, the method comprising the steps of:


Schuhmann M.,Clariant | Baier H.-D.,Clariant | Lewis D.M.,Perachem Ltd. | Hawkes J.,Perachem Ltd. | Sigmund H.,Clariant
Melliand International | Year: 2012

The market for coating additives with flame-retardant properties, especially in the US and Asia, is still dominated by halogen based chemistry. Nevertheless recent market related changes as well as new product safety related data urge the textile processing industries to reconsider their strategies. Therefore new non-halogenated alternatives have to be identified which can meet similar broad application ranges but also achieve comparable chemical efficiency, often being the exclusion factor for already existing halogen-free solutions during past years. A novel phosphorus chemistry initially developed for plastics now allows efficient flame-retardant action in back coatings with lower fiber selectivity than observed when using common established chemistries. In flame-retardant finishing on the other hand currently available products for durable effects on cotton and cotton rich blends are based since decades on non-halogen systems, but the established processes are linked to high formaldehyde emission levels. These have to be considered as problem for waste water streams but especially with respect to air emissions as worker safety is potentially at risk. A novel simple process technology is able to achieve high wash durability and materials with neutral hand accompanied by lower tensile strength loss and low impact on vat or selected reactive dyes regarding shade change. Source

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