JP2588868B2 - Alkali easily soluble filament - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alkali-soluble filament. In particular, the present invention relates to an alkali-soluble filament suitable for use in a polyester fiber special pattern fabric having a watermark pattern, a so-called opal-processed fabric.

[0002]

2. Description of the Related Art Alkali-soluble polymers have been known for a long time, and polyethylene terephthalate obtained by copolymerizing sulfoisophthalic acid and its derivatives, polyethylene glycol and the like has been widely used as an alkali-soluble polymer. Particularly, it is used as a dissolving segment of a dissolving splittable conjugate fiber.
No. 6,944,619 and Japanese Patent Application Laid-Open No. 1-162813.

It has also been proposed to use an alkali-soluble polymer alone, as disclosed in, for example, JP-A-64-267.
No. 47 describes "a mixed fiber consisting of a polyester filament yarn and a cocoon yarn of a silk filament, and a mixed fiber consisting of a polyester fiber or a composite yarn of a polyester which is easily dissolved under silk scouring conditions and a polyester which is not easily dissolved. Yarn "is described. The mixed yarn is sodium 3,5 dicarboxybenzenesulfonate (sodium sulfoisophthalic acid) in 8
By using a copolymerized polyethylene terephthalate containing at least 1% by weight and a polyalkylene glycol as an easily soluble component, an alkaline aqueous solution (aqueous solution of Marcel soap and soda ash), which is a condition for scouring silk after forming a fabric, is used. Is to improve the drapability and surface touch of the treated fabric by dissolving the.

On the other hand, water-soluble filaments have also been developed, as disclosed in JP-A-2-139443 and JP-A-2-21625.
No. 9 describes a water-soluble vinylon. However, since it is water-soluble, it cannot be used for fabrics, such as opal processing, in which it is essential to leave some of its filaments, because they cannot be washed.

This is disclosed in Japanese Patent Application Laid-Open No. 55-90673.
"Print a polyester-containing fiber containing two or more types of polyester fibers with different alkali weight loss rates, and print out the polyester fibers with a large alkali weight loss rate." Similarly, even when used, the filament remains without being dissolved, so it is necessary to pay attention to various physical property values such as suppressing a decrease in light resistance.

[0006]

The above-mentioned alkali-soluble filament contains a large amount of sulfoisophthalic acid in order to increase the dissolution rate. As a result, the melt viscosity of the polymer becomes extremely high, and the melt spinning becomes extremely difficult. Having. Also, in order to avoid this, when polyalkylene glycol is copolymerized, light resistance is significantly reduced,
If the easily soluble filaments remain even in a small amount, they have a disadvantage that they turn yellow when exposed to light for a long time.

An object of the present invention is to provide a filament which dissolves very quickly in an alkali suitable for opal processing or the like and, when it remains, has excellent light resistance. That is, in order to increase the alkali dissolution rate, it is optimal to use polyethylene terephthalate in which the copolymerization ratio of sulfoisophthalic acid is increased, but if the copolymerization ratio is high, the melt viscosity becomes extremely high, and melt spinning becomes difficult. It will be difficult. Thus, lowering the copolymerization ratio of sulfoisophthalic acid and substituting polyalkylene glycol for copolymerization lowers the melt viscosity and facilitates spinning, but lowers light resistance. On the other hand, if the copolymerization amount of the polyalkylene glycol is too large, generation of white powder at the time of yarn production and weaving is increased. The present inventors have intensively studied to resolve this dilemma, and have reached the present invention.

[0008]

The alkali-soluble filament of the present invention is a filament comprising a polymer containing polyethylene terephthalate as a main component, wherein the polymer is a copolymer of an alkali metal salt of sulfoisophthalic acid and polyethylene glycol. And the polymer contains 0.2 to 2% by weight of a benzotriazole compound and / or a benzophenone compound.

Examples of the metal salt of sulfoisophthalic acid include lithium sulfoisophthalic acid, potassium sulfoisophthalic acid, and sodium sulfoisophthalic acid, with sodium sulfoisophthalic acid being preferred. The copolymerization ratio of the metal salt of sulfoisophthalic acid to polyethylene terephthalate is preferably 2 to 5 mol%. If it is less than 2 mol%, the alkali dissolution rate will be extremely low, and if it exceeds 5 mol%, the melt viscosity will be extremely high for the degree of polymerization, making spinning difficult and the yarn strength not increasing. However, when the copolymerization ratio of the metal salt of sulfoisophthalic acid to polyethylene terephthalate is 2 mol% to 5 mol%, the alkali dissolution rate is
Because it is only 3 to 30 times that of pure polyethylene terephthalate, polyethylene glycol is also copolymerized.

The copolymerization ratio of polyethylene glycol is 5
~ 12% by weight is preferred. If it is less than 5% by weight, the alkali dissolution rate cannot be sufficiently improved. When the content exceeds 12% by weight, white powder is generated in a process after the yarn is formed and adheres to a guide or the like, often impairing operability. The molecular weight of polyethylene glycol is preferably from 1,000 to 5,000. When the molecular weight is less than 1,000, the molecular weight of the copolymer does not sufficiently increase, and when the molecular weight exceeds 5,000, since it is a solid at ordinary temperature, the time required for melting is increased.

The alkali dissolution rate of the copolyester thus obtained can be 50 times or more that of pure polyethylene terephthalate when caustic soda is used as the alkali. For example, 4 mol% of sodium sulfoisophthalate and molecular weight When 10% by weight of 4000 polyethylene glycol is copolymerized, the dissolution rate is about 100 times that of pure polyethylene terephthalate.

The alkali dissolution rate is preferably at least 50 times the rate of weight loss when the paste containing sodium trichloroacetate is dipped and then treated with saturated steam at 100 ° C. This is also achieved in polymerized polyethylene terephthalate.

[0013] Sodium trichloroacetate is neutral in itself, but decomposes at high temperatures to form sodium carbonate and chloroform. Therefore, the sizing agent containing sodium trichloroacetate is advantageous because there is almost no danger in handling, it shows alkalinity in a high-temperature steam atmosphere, and its alkali strength is smaller than that of caustic soda and the rate of weight loss can be easily controlled. Since the time required for the yarn of the copolymerized polyester to completely dissolve in alkali is extremely short, there is almost no damage to the mixed or cross-woven polyethylene terephthalate yarn.

The alkali-soluble filament of the present invention comprises:
The copolymerized polyester contains a benzotriazole-based compound and / or a benzophanone-based compound in an amount of 0.2 to 2% by weight. Benzotriazole compounds include:
2- (5-methyl-2-hydroxyphenyl) benzotriazole, 2- [3.5-bis (2,2-dimethylpropyl) -2-hydroxyphenyl] benzotriazole, 2- (3-tbutyl-5-methyl -2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3
• 5-dibutyl-2-hydroxyphenyl) -5-chlorobenzotriazole and the like, and examples of the benzophenone-based compound include 2-4-dihydroxybenzophenone, 2.2 ′, 4.4′-tetrahydroxybenzophenone. , 2-hydroxy-4- (β-hydroxyethoxy) -benzophenone, bis (5-benzoyl-4)
-Hydroxy-2-methoxyphenyl) methane and the like.

If these benzotriazole-based compounds and / or benzophenone-based compounds are contained in an amount of less than 0.2% by weight, the effect of absorbing ultraviolet light is poor, and light resistance cannot be sufficiently imparted to the polymer. On the other hand, if it exceeds 2% by weight, the spinning operability is rather badly affected.

The heat-shrinkage rate of the alkali-soluble filament of the present invention is preferably 12% or less. If the heat shrinkage exceeds 12%, after the present filament and regular polyester are cross-woven, when subjected to opal processing or the like, cracking or embossing occurs, and it becomes difficult to print an alkali paste. In order to reduce the heat shrinkage to 12% or less, a method of performing a high-temperature heat treatment at the time of drawing after spinning, a method of performing a relaxation heat treatment after drawing, and the like can be given.

The alkali-soluble filament is
It is preferable to mix this with a difficult-to-dissolve filament such as a regular polyester filament yarn to form a fabric, and print an alkaline sizing agent on the fabric to dissolve and remove the alkali-soluble filament. can get. As such an alkaline paste, caustic soda, salts of carboxylic acid chloride and the like can be used, but the latter is particularly preferable, and specifically, sodium salt of carboxylic acid chloride is more preferably sodium trichloroacetate.
The paste is preferably an inorganic paste, and diatomaceous earth and montmorillonite are preferably added.

When a salt of a carboxylic acid chloride is used, it is preferable to perform a heat treatment (steaming) at a relative humidity of 90% or more for 7 minutes or more, preferably several tens minutes, as a dissolution removal treatment.

[0019]

The present invention will be described in more detail with reference to the following examples. 600 parts of dimethyl terephthalate and 184 parts of ethylene glycol were charged into an autoclave, and a transesterification catalyst was added thereto to convert the mixture into bis-hydroxy-ethyl terephthalate by a conventional method. Then, an ethylene glycol solution of sodium sulfoisophthalic acid (35% by weight) was added. 110
And 55 parts of polyethylene glycol having a molecular weight of 4000 and a polymerization catalyst, and the copolymerized polyester was polymerized by a conventional method to form chips. The obtained polymer is polyethylene terephthalate in which sodium sulfoisophthalic acid is copolymerized at 3 mol% and polyethylene glycol at 8 wt%.

The polymer chip is dried and has a water content of 0.0
After the mixture was adjusted to 05% by weight, 2- (5-methyl-2-hydroxyphenyl) benzotriazole and / or 2-4-dihydroxybenzophenone were mixed and stirred. A polymer chip was manufactured.

This is heated and melted at a spinning temperature of 295 ° C., then spun from a die having 36 orifices having a round cross section, and after cooling, it is wound at a speed of 1470 m / min.
3d / 36f alkali-soluble unstretched filaments
Five types were manufactured.

The obtained undrawn yarn was drawn at a draw ratio of 2.84, a roll heater temperature of 80 ° C., and a plate heater temperature of 170 °.
C, after stretching at a stretching speed of 1010 m / min,
An alkali easily soluble drawn filament of 75d / 36f was obtained. The hot water shrinkage of the drawn yarn was 10.2%.

The alkali reduction rate and light resistance of the obtained filament were evaluated by the following methods. (1) Alkali weight loss rate A 75d / 36f filament of pure polyethylene terephthalate was used as a control and each was knitted in a tube. The weight W ₀ of each was measured, it was measured by the following 2 methods. A: Immersion in a 0.5% NaOH aqueous solution (98 ° C.)
The weight W ₁ after _one minute was measured. B: After dipping a paste consisting of 20% of sodium trichloroacetate, 60% of water and 20% of main paste for printing, 10
Weight W ₁ after washing with water, which was treated with saturated steam at 0 ° C. for 40 minutes.
Measure.

For these, the alkali weight loss rate is determined by the following equation.

(Equation 1) The ratio of the weight loss rate (N _i ) of the various alkali-soluble filaments to the weight loss rate (N _o ) of the pure polyethylene terephthalate filament was defined as the alkali weight loss rate ratio.

(Equation 2)

(2) Light fastness: Various tubular knitted fabrics are dyed with Sumikaron Blue SERPD (Sumitomo Chemical) owf 2% -reduced washing and then washed with a carbon arc fade meter.
Irradiation was performed at 3 ° C. for 40 hours, and the blue scale was determined.

The results are shown in Table 1.

[Table 1]

From Table 1, it can be seen that benzophenone compounds and / or
Alternatively, by mixing a benzophenone-based compound in an amount of 0.2 to 2.0% by weight, without impairing the alkali solubility,
In addition, it is understood that the light resistance is improved, and it can also be used for light exposure applications such as curtains.

Further, No. After the alkali-soluble drawn filament of No. 14 and the 75 d / 36 f regular polyester filament were twisted to 150 d / 72 f,
Using this twisted yarn as the weft, a plain fabric having a warp of 50 yarns / inch and a weft of 40 yarns / inch was manufactured.

After refining and heat setting the plain woven fabric, an extraction paste (PH6) consisting of 100 parts in total, 20 parts of sodium trichlorate, 8 parts of diatomaceous earth, 6 parts of montmorillonite, 3 parts of carboxymethylcellulose, 63 parts of water. .0), dried at 105 ° C. for 2 minutes, steamed at 130 ° C. for 30 minutes with saturated steam five times, and washed and dried. The alkali-soluble filaments in the printed portion were completely removed. As a result, a sharp opal-processed product was obtained.

[0030]

Since the alkali-soluble filament of the present invention has a very high alkali dissolution rate, even if it is used for hollow woven fabric, embroidery lace, and the like formed by interweaving with polyester, the desired filament can be used without damaging the polyester side. can get. At the same time, since it is excellent in light resistance, a fabric such as an opal-processed curtain which exhibits a special pattern and does not discolor even when exposed to light for a long time can be obtained.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location D06M 11/38 D06M 5/02 F

Claims (1)

(57) [Claims] 1. A filament comprising a polymer containing polyethylene terephthalate as a main component, wherein the polymer is a copolymer of an alkali metal salt of sulfoisophthalic acid and polyethylene glycol, and the polymer is 0.2 to 2%. An alkali-soluble filament containing at least 1% by weight of a benzotriazole-based compound and / or a benzophenone-based compound.