JPH02221413A - Hygroscopic polyester fiber - Google Patents

Abstract

PURPOSE:To obtain the subject fiber having permanent hygroscopicity and unique feeling by dispersing and mixing a specified amount of cellulose acetate in a terephthalic acid-based polyester. CONSTITUTION:In a polyester (e.g. polyethylene terephthalate or polybutylene terephthalate) containing terephthalic acid as the main acid component, 1-30wt.%, preferably 10-15wt.% cellulose acetate (preferably 52-63% degree of acetylation) is dispersed and mixed to obtain the objective fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to hygroscopic polyester fibers.

<Prior Art> Polyester, especially polyester containing terephthalic acid as its main acid component, has mechanical and physical properties.

Fibers and films due to their excellent chemical properties.

Widely used for other molded products.

However, such polyester has extremely low hygroscopicity, and its use is currently limited, particularly in clothing applications.

Many attempts have been made to improve the hygroscopicity of polyester fibers.

For example, a method of blending polyester and cotton is commonly used, but this method limits the form of the polyester fiber to a cotton fabric, so the excellent physical properties of polyester must be sacrificed to some extent. There are problems such as this, and it cannot be said to be a satisfactory method.

In addition, a method in which fine pores are formed by spinning polyester to which a specific compound is added and then subjecting it to alkali treatment (Japanese Patent Laid-Open No. Sho 5)
6-43420), a method of copolymerizing or mixing polyoxyalkylene glycol with polyester to improve water absorption (Japanese Patent Publication No. 44-30010), and a method of adding a hydrophilic compound in post-processing (Japanese Patent Publication No. 44-30010). 49-5599
9) have been proposed.

However, these methods cannot be said to be satisfactory in that the hygroscopicity changes significantly over time. In the method of forming micropores, the micropores become buried with dirt etc. during use, resulting in a decrease in hygroscopicity.In the method of using polyoxyalkylene glycol, the polyoxyalkylene glycol deteriorates due to sunlight, etc., resulting in a decrease in hygroscopicity. In addition, post-processing methods have problems in terms of durability, such as the processing agent falling off during washing or the like.

<Object of the Invention> The present invention was made against this background, and its object is to provide a polyester fiber miscellaneous material having permanently excellent hygroscopicity.

<Structure> As a result of intensive studies aimed at achieving the above object, the present inventors discovered that permanent hygroscopicity could be imparted by dispersing and mixing cellulose acetate into polyester, and thus arrived at the present invention.

That is, in the present invention, cellulose acetate is contained in a polyester containing terephthalic acid as a main acid component (1% to 30fi1%).
It is a hygroscopic polyester fiber characterized by being dispersed (with respect to polyester).

The polyester in the present invention mainly refers to polyethylene terephthalate and polybutylene terephthalate, but a small amount of a third component, preferably 30 mol % or less based on the main acid component, such as isophthalic acid and naphthalene dicarboxylic acid.

diphenyl dicarboxylic acid, diphenyl ether dicarboxylic acid, diphenyl sulfone dicarboxylic acid, diphenoxyethane dicarboxylic acid, adipic acid, azelaic acid,
Sebacic acid, β-hydroxyethoxybenzoic acid, ω-hydroxycaproic acid.

Aromatic acid components such as hexahydroxyterephthalic acid, alicyclic acid components, aliphatic acid components, trimethylene glycol, hexamethylene glycol.

Decamethylene glycol, diethylene glycol.

Aromatic, alicyclic, aliphatic diol components such as Schiff-hexane dimetatool, 2.2,4.4-tetramethyl Schiff-butanediol, bis(β-humanOxyethoxyphenyl)propane, polyethylene glycol; A polyester obtained by copolymerizing one or more of these ester-forming derivatives may also be used.

These boliers and stells include trifunctional or higher polyfunctional compounds such as trimellitic acid, trimethylolpropane, and pentaerythritol, and/or monofunctional compounds such as benzoic acid, 0-benzoylbenzoic acid, and methoxypolyethylene glycol, or esters thereof. The resulting polyester may be substantially linear and may be copolymerized with one or more selected from formable derivatives within a certain range.

The type of cellulose acetate used in the present invention is not particularly limited, and any linter pulp may be used as a raw material, but among them, cellulose acetate with a degree of acetylation of 52 to 6
3% triacetate, especially triacetate with an acetylation degree of 59 to 63%, is preferable because it causes very few troubles during spinning.

The blending amount of cellulose acetate is 1 to 3 to polyester.
0 wt%, preferably 5 to 20 wt%, more preferably 1
0 to 15 wt% is required. When the amount of added Q is less than 1 wt%, the effect of improving hygroscopicity is small, and when it exceeds 30 w%, the physical properties of the fibers are markedly deteriorated and the color tone of the resulting fibers is also deteriorated, which is not preferable.

In the present invention, the method of blending the polyester and cellulose acetate and spinning the mixture can be the same as the conventional method of mixing the polyester and other polymers and spinning the mixture.

For example, there are methods such as feeding polyester polymer and finely powdered cellulose acetate into an extruder at the same time, melt-mixing them, and then spinning them, and feeding finely powdered cellulose acetate into pre-melted polyester from the middle of the extruder. Can be mentioned.

Note that the polyester fiber of the present invention may contain optional additives, such as Catalyst 1 and color inhibitor, if necessary.

Heat resistance improvers, flame retardants, i%A inhibitors, matting agents9 colorants, inorganic particles, plasticizers, etc. may be included, and in particular,
It is preferable to add a plasticizer for the purpose of improving the fluidity of cellulose acetate.

Examples of plasticizers include polyester glycol having a molecular life of 300 to 1000, dimethyl phthalate, diethyl phthalate, and the like.

<Effects of the Invention> As described above, according to the present invention, polyester I[l] having permanent hygroscopicity can be produced.

Furthermore, since the blending of cellulose acetate creates fine irregularities on the surface of the yarn, the fabric obtained from the polyester fiber of the present invention has the effect of exhibiting a unique texture.

EXAMPLES The present invention will be described in more detail below with reference to Examples.

The equilibrium moisture absorption rate in the examples is a value obtained by absorbing moisture in an atmosphere of 20° C. and 65% relative humidity.

In addition, after knitting the yarn into stockinette knitting, using a home washing machine, Neoperex P (manufactured by Kao Soap Co., Ltd.) 0.
Wash with a 2% aqueous solution at 40°C for 10 minutes, then wash at 40°C.
It is washed with hot water at 60° C. for 5 minutes, then washed with overflow water for 15 minutes, dehydrated, and dried at 60° C. for 30 minutes.

The equilibrium moisture absorption rate after repeating this washing-drying process 20 times is H
a. Let Hso be the equilibrium moisture absorption rate after repeating 50 times.

Further, the equilibrium moisture absorption rate when these operations are not performed is Ho.

Example 1 Cell O-sudiacetate flakes (degree of acetylation 55.4%)
: 350+++ esh pass particle size) were uniformly mixed with 15 W [%] of polyethylene terephthalate pellets (intrinsic viscosity measured with an orthochlorophenol solution at 35°C > 0.64), and then melt-blended using a twin-screw extruder to form pores. It was extruded from several 24 spinnerets at a discharge cycle of 219/in and wound at a take-up speed of 3000 m/min.After that, it was stretched to twice the original size using an O-roller 8.
The drawn yarn was heat-treated by passing through a 180°C zone in a constant length state (0°C) to obtain a drawn yarn.

The obtained yarn has a strength of 3.0 g/denier and an elongation of 20%, and the equilibrium moisture absorption rate is Ho = 2.0%, To12o = 1.
9%, H button = 1.9%.

Example 2 The same procedure as in Example 1 was carried out except that 30 W% (based on cellulose diacetate) of polyethylene glycol (molecular 1600) as a plasticizer was added to cellulose diacetate in advance.

The obtained yarn had a strength of 3.29/denier, an elongation of 23%, and an equilibrium moisture absorption rate of No = 2.1% and To1zo = 1.9.
%.

H5O=1.8%.

Comparative Example 1 The same procedure as in Example 1 was carried out except that the amount of cellulose diacetate added was 0.swt%.

The obtained yarn has a strength of 3.69/denier, an elongation of 25%, and an equilibrium moisture absorption rate of Ho = 0.47% and H2@ = 0.4.
6%, and 1so=0.45%.

Example 3 The same procedure as in Example 1 was carried out except that cellulose triacetate having a degree of acetylation of 61.5% was used instead of cellulose diacetate.

The obtained yarn has a strength of 3.29/denier, an elongation of 22%, and an equilibrium moisture absorption rate of Ha = 2.1% and H21 = 1.9%.
.

H3O-1.8%.

Claims (2)

[Claims] (1) A hygroscopic polyester fiber characterized in that 1 to 30% by weight (based on the polyester) of cellulose acetate is dispersed in a polyester containing terephthalic acid as the main acid component. (2) The hygroscopic polyester fiber according to claim (1), wherein the degree of acetylation of cellulose acetate is 52 to 63%.