CV of speaker – John Hook

Nationality: English

Employer: Clariant International, Basel, Switzerland.

Education: MSc Polymer and Dyestuff Chemistry – Bradford College, England

Member: Associate of Society of Dyer and Colourists

Awards: Turner Schofield Award (1988)– Work on Reactant Fixable Dyestuffs

Work History:
Started Sandoz 1973. – Lab. Technician
Head Sandoz Dyestuffs UK 1990 – 2001
2001 – 2004. Clariant Head Textile Business Southern Africa
2004 – 2005. Clariant Technical Head Textile Dyes Business China
2005 – 2007. Clariant Technical Head Textile Dyes Business USA
2007 – Present. Product Line Head – Acid and Metal complex Dyestuffs Clariant , Switzerland

Synopsis:

Section 1

The paper discusses the rudimentary, ecological and practical issues for successful dyeing of polyamide and polypeptide fibers. The demands on processing fastness and the increasing demands on end user fastness, the shift to finer synthetic fibers and the problems presented by the long haired superfine woolen fibers gives the dyer a number of potential dyestuff options for both fiber types. However there are, as always, positive and negative aspects of each potential dyestuff class and equally, post fixation treatments to consider and this paper takes a look at what dyestuffs are available and where a technical gap is filled by the development and expansion of the Nylosan S dyestuff range along with post fixation using Nylofixan HF.

Section 2
The basic requirements of a new dyestuff are discussed with a view to processing and end user fastness, ecology, application, economy etc. and the need to determine what chemical and physical attributes are significant to a dyestuffs’ performance.
These performances are compared between dyestuff classes and the consequential strengths and weaknesses are briefly reviewed.

The ‘design ‘of a new dyestuff has many influences and all these must be considered to reach the optimum goal (namely, a product which performs and ultimately sells).The different perspectives of those in the chain - Dyestuff Manufacturer – Dyer – Retailer – to ultimately the End User are discussed:

Chemical and physical constitution, stability, ecology in manufacture, economy, ease of application, fastness, application stability, subsequent processing stability, fault correction, coverage, ecology in application, performance, color appeal, resilience and ultimately ecology in disposal.