**Flame Retardancy and Dyeing Fastness of Flame Retardant Polyester Fibers**

Seung Cheol Yang, Moo Song Kim and Maeng-Sok Kim *Nylon Polyester Polymer R&D Team, Production R&D Center, Hyosung R&D Business Labs, 183, Hogye-dong, Dongan-gu, Anyang-si, Korea* 

## **1. Introduction**

100 Natural Dyes

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> This is a continuation of previously published paper1, 2, 3) in which the dyeing properties and chemical resistances of the flame retardant polyester fiber according to the type of flame retardants were reported.

> Polyester, mainly poly(ethylene terephthalate) fiber is widely used for textile apparel, industrial fiber, tire cord, etc., and the demands and supplies are growing annually by 9%. As interest in the danger of fire, the demand for flame retardant polyester fiber has been strong and there have been many researches and developments to improve the flame retardant polyester.

> In the our previous publication1, 2, 3, we report the relationships between phosphorous flame retardants and the products such as polymer, fiber according to the type of flame retardants. Flame retardant polyester fiber is used for other purposes not as a normal PET fiber. Normal PET fiber is primarily used in the textile apparel whereas the flame retardant polyester fiber is mainly used for industrial applications such as the upholstery or car interior. Therefore, flame retardant polyester fiber goods are exposed to the open air more than a normal PET fiber. If the flame retardant polyester fiber vulnerable to UV, the application of the fiber is limited. So, the flame retardant polyester fiber must have good weatherability such as good light fastness and anti-UV properties.

> In general, Polyester fiber use deluster to reduce the transmission of light. Deluster, commonly titanium dioxide, shows good protection of UV in the fields, preventing the passage of light. However, the titanium dioxide has low band gap, between the ground state and the excited state, it is deteriorated in high dosage and for long periods.4)

> Dyeing of polyester products primarily conducted at high temperature and pressure using disperse dyestuff. Disperse dyestuff is divided into nitrodiphenyl, amine, azo and anthraquinone dyestuff greatly depending on its chemical structure.5)

> In this chapter, flame retardancy and dyeing fastness of flame retardant polyester fiber were compared with those of normal PET fiber in accordance with contents of the flame retardant and deluster. Increasing deluster(titanium dioxide) content in the flame retardant polyester fiber, flame retardancy is lowered, but dyeing fastness shows almost same level. Besides light fastness, dyeing fastness shows similar level with increased phosphorous content compared with normal polyester fiber.

Flame Retardancy and Dyeing Fastness of Flame Retardant Polyester Fibers 103

LOI with deluster content

0 0.5 1 1.5 2 2.5 3 Deluster content(wt%)

30

Fig. 2. Flame retardancies with deluster contents

Fig. 3. Bandgaps of various semiconducting metals

35

LOI

40

y = -2.0914x + 37.114 R2 = 0.9335
