Modified polyester filament, hetero-shrinkage conjugate polyester filament and their fabrics

Abstract

Disclosed is to provide a modified polyester filament, which is formed by spinning the polyester resin composed of ethylene terephthalate more than 85 mol % as main component repeating unit, and component A organic sulfonate shown as the formula listed below RSO3M [wherein R is selected from alkyl group of carbon 3 to 30, aromatic group and alkyl aromatic group of carbon 7 to 40; M is selected from alkali metal, alkali earth metal] and component B polyalkylene glycol and satisfies the following three conditions (1) the content of said component A RSO3M is from 0.4 weight % to 5 weight %; (2) the content of said component B polyalkylene glycol is from 0.4 weight % to 5 weight %; (3) said polyester filament obtained by spinning is subjected to alkali treatment to reduce the weight in an amount of 5-45% with 60~130° C. alkali solution of concentration 0.2 to 8.0 weight %, dyeing to get polyester filament having 0.1~0.001 d.p.f. (denier per filament) ultrafine fluffs thereon Fabric woven by using the hetero-shrinkage conjugate polyester filament textured yarn made by combining the modified polyester filament with high boiling water shrinkage filament and draw twisting has soft, puffy, dry feeling and natural fiber like hand, can elevate the commercial value of polyester filament, suitable to high grade clothing.

Description

[0001] This invention relates to a modified polyester filament, hetero-shrinkage conjugate polyester filament made by combining the modified polyester filament with high boiling water shrinkage filament and draw twisting, and their fabrics, especially to a polyester filament having 0.1.about.0.001 d.p.f. (denier per filament) ultrafine fluffs thereon, the filament obtained has soft, puffy, dry feeling and natural fiber like hand, can improve the deficiency of synthetic filament, elevate the commercial value of polyester filament, suitable to high grade clothing.PRIOR ART[0002] Polyester can be widely used in versatile usages such as filament, film, packaging container and engineering plastics X wherein filament is the most used. Despite of polyester filament has excellent physical property, but also posses many deficiencies of synthetic fiber such as no water absorption, rough, no smooth hand etc., Especially in the clothing use, hand of fiber is the key point of commercial value. T...

AI Technical Summary

Benefits of technology

This patent is about a modified polyester filament that has ultrafine fluffs on its surface, making it soft, puffy, and dry feeling like natural fiber. This filament can be used to improve the deficiencies of synthetic fibers and elevate the commercial value of polyester filament. The invention also includes a method for combining the modified polyester filament with high boiling water shrinkage yarn to create a hetero-shrinkage conjugate yarn. The fabric made from this yarn has soft, puffy, and dry feeling like natural fiber. The modified polyester filament is composed of polyester resin and a specific organic sulfonate. The invention also provides a method for decreasing the d.p.f. (denier per filament) of the filament to achieve a soft, puffy, and dry feeling like natural fiber.

Problems solved by technology

But there are defects in these methods.

Though these two methods can be used to obtain filament having soft hand feeling, but the filament obtained is lack of dry feeling and touch as that of natural filament.

While if the addition amount is greater than 5.0 wt %, the effect reached is over saturated, the physical properties of filament obtained are decreased and unstable.

While if the molecule is greater than 50,000, the thermal stability becomes bad and its compatibility with polyester is inferior to cause uneasy dispersion, and also do harm to the physical properties of filament.

Polyalkylene glycol will be bound at the molecular chain of filament if polyalkylene glycol is completely copolymerize with polyester, and this will do harm to the effect of promoting dispersion of organic sulfonate and enhancing filament splitting.

As to the compatibility of polyalkylene glycol with polyester, the compatibility of small molecular weight polyalkylene glycol is better, while the compatibility of high molecular weight polyalkylene glycol is bad.

The higher the molecular weight of polyalkylene glycol, the more difficult to compatible with polyester, which do no good to the effect on dispersing organic sulfonate and enhancing splitting of filament.

Besides, as to the heat resistance of polyalkylene glycol, the smaller the molecular weight of polyalkylene glycol, the better the heat resistance and the higher the molecular weight of polyalkylene glycol, the more inferior the heat resistance.

In view of utility, the more the molecular weight of polyalkylene glycol will cause the defects of inferior heat resistance and bad physical properties.

The decrement (reduction) speed is too slow if the concentration of alkali solution is less than 0.2 wt %; the decrement (reduction) speed is too rapid to control the reduction rate if the concentration of alkali solution is greater than 8 wt %, this will cause over reduction to greatly decrease the strength of filament.

The reduction speed is too slow and the reduction needed is too long if the temperature is lower than 60.degree. C.

The reduction speed is too fast to control the reduction rate if the temperature is higher than 130.degree. C., this will cause over reduction to greatly decrease the strength of filament.

The structure of filament will apt to be destroyed if the reduction rate is higher than 45%, this will cause the filament decrease its physical property rapidly and lose the utility.

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