Resist ether-protected chemical

Other reported chemical amplification resist polymers based on the acid-catalyzed deprotection of ether-protected groups include the hydrolysis of tri-methylsilyl (TMS) ether polymer and the alcoholysis of tetrapyranal (THP) -protected group polymer all of these lead to conversion to PHOST (see Scheme 1.2% ) ... 

Traditionally, Zirpro -finished wool meets the above requirements and decabro-modiphenyl ether/antimony oxide-acrylic resin-fmished cotton fabrics (originally marketed as Caliban, White Chemical) have also been found to be suitable for workers in the aluminium industry. However, as discussed in Chapter 8, this latter finish is currently being withdrawn on environmental grounds and this whole area has recently been reviewed by Makinen, who lists more recent fabrics based on a variety of blends with flame retardant wool, viscose, and inherently flame retardant aramid fibres, for example. However, these factors are all different for molten iron or steel, copper, tin, lead, zinc, or aluminium and so protective aprons and overalls have to be tailored to fit the threat. Examples listed by Makinen for molten aluminium resistance include ... 

Saito Y, Matsumoto K, Higashihara T, Ueda M. A chemically amphfied, negative-type photosensitive polyCphenylene ether ketone) (PEK) resist based on ketal-protected PEK and a photoacid generator. Chem Lett 2009 38(11) 1048-9. 

A copolymeric derivative of the para-aramid fibres was introduced by Teijin in 1985 under the trade name Technora .This fibre is based on the 1 1 copoly(terephthalamide) of 3,4 -diaminodiphenyl ether and p-phenylene-diamine and is claimed to have a much higher chemical resistance than PPTA, as well as increased abrasion and steam resistance, which are useful properties in many protective applications. Technora has a decomposition temperature of about 500°C and other properties are comparable with PPTA although its LOI value is slightly lower at 25 vol %. 

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