JPH073528A - Saturated polyester-based fiber - Google Patents

Abstract

PURPOSE:To obtain a saturated polyester-based fiber excellent in bulkiness and also having flexibility and suitable for carpet. CONSTITUTION:This saturated polyester-based fiber is composed of (A) 94.5-51wt.% of a saturated polyester rein, (B) 0.5-9wt.% of a modified polyolefin resin and (C) 5-40wt.% of a polypropylene resin.

Description

Detailed Description of the Invention

[0001]

The present invention has excellent characteristics of saturated polyester resin and polypropylene resin,
In particular, the present invention relates to a saturated polyester fiber having bulkiness and flexibility, which is suitable for carpets and the like.

[0002]

2. Description of the Related Art Saturated polyester resins are excellent in heat resistance and bulkiness, but lack the flexibility, have poor recovery characteristics, and have an inherent disadvantage that they have a large specific gravity as compared with nylon and polyolefin. ing. On the other hand, polypropylene resin has excellent properties such as processability, toughness, water resistance, and chemical resistance, and has low specific gravity and is inexpensive, but has drawbacks in heat resistance and dyeability. There is. Therefore, in order to improve the respective drawbacks of the saturated polyester resin and the polypropylene resin, it is conceivable to use these resins together, but a resin mixture obtained by mixing the saturated polyester resin and the polypropylene resin by a usual method, or A resin composition obtained by simply melt-kneading has poor compatibility and cannot be a composition having the desired excellent physical properties.

Therefore, a composite fiber composed of polypropylene fiber and polyethylene terephthalate fiber (Japanese Patent Laid-Open No. 55-55
-41807, Japanese Patent Application Laid-Open No. 2-191719) and fibers made of polyethylene terephthalate as a core component and polypropylene as a sheath component (Japanese Patent Application Laid-Open No. 2-145842). However, since these fibers are composite fibers, the manufacturing process is complicated, and they are not fibers having the excellent physical properties of both polypropylene resin and polyethylene terephthalate resin.

A composition comprising a saturated polyester resin, a polyolefin polymer, an epoxy group-containing copolymer and the like is known for the purpose of improving rigidity, impact resistance and the like (JP-A-59). -115352, Japanese Patent Laid-Open No. 61-60746), there is a problem in stretchability in the case of fiber molding. Therefore, at present, fibers having the excellent properties of both polypropylene and saturated polyester have not been obtained.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and provides a saturated and saturated polyester fiber having excellent moldability, particularly stretchability, and balanced strength / elongation, which is flexible and bulky. The task is to do.

[0006]

Means for Solving the Problems The above-mentioned problems are (A) saturated polyester resin 94.5 to 51% by weight, (B) modified polyolefin resin 0.5 to 9% by weight, and (C) polypropylene resin 5 to 40. The problem can be solved by using a saturated polyester fiber composed of 10% by weight.

As the saturated polyester resin (A) used in the present invention, various saturated polyesters composed of a dicarboxylic acid component and a diol component can be used.

Examples of the dicarboxylic acid component include terephthalic acid, sebacic acid, dodecanedicarboxylic acid, and the like.
20 aliphatic dicarboxylic acids, isophthalic acid, naphthalenedicarboxylic acid and other aromatic dicarboxylic acids, or cyclohexanedicarboxylic acid and other alicyclic dicarboxylic acids, singly or as a mixture, particularly those containing 40 mole% or more of terephthalic acid. preferable.

Aliphatic glycols such as ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, 1,10-decanediol and 1,4-cyclohexanediol are used as the diol component. Examples thereof include alicyclic glycols alone or as a mixture.

Among these saturated polyester resins, polyethylene terephthalate or polybutylene terephthalate is particularly desirable.

The intrinsic viscosity of the saturated polyester resin (the intrinsic viscosity measured at 25 ° C. using o-chlorophenol as a solvent) is preferably in the range of 0.5 to 3.0. However, it is difficult to obtain the desired mechanical strength.

As the modified polyolefin (B) used in the present invention, there are various kinds, including carboxylic acid groups (acetic acid group, acrylic acid group, methacrylic acid group, fumaric acid group, itaconic acid group, etc.), carboxylic acid. Metal base (sodium salt, calcium salt, magnesium salt, zinc salt, etc.), carboxylic acid ester group (methyl ester group, ethyl ester group, propyl ester group, butyl ester group, vinyl ester group, etc.), acid anhydride group (anhydrous) It is a polyolefin having at least one functional group selected from maleic acid groups) and epoxy groups.

As the polyolefin, polyethylene,
Examples thereof include polypropylene, polybutene, ethylene / propylene copolymers, ethylene / butene copolymers, ethylene / hexene copolymers, and copolymers containing a small amount of diene therein.

Specific examples of the modified polyolefin include ethylene / acrylic acid copolymer, ethylene / methacrylic acid copolymer, ethylene / fumaric acid copolymer, ethylene / methacrylic acid / zinc methacrylate copolymer, ethylene / acrylic. Acid / sodium methacrylate copolymer, ethylene / isobutyl acrylate / methacrylic acid / zinc methacrylate copolymer, ethylene / methyl methacrylate / methacrylic acid / magnesium methacrylate copolymer, ethylene / ethyl acrylate copolymer, Ethylene / vinyl acetate copolymer, ethylene / glycidyl methacrylate copolymer,
Ethylene / vinyl acetate / glycidyl methacrylate copolymer, maleic anhydride grafted polyethylene, acrylic acid grafted polyethylene, maleic anhydride grafted ethylene / propylene copolymer, acrylic acid grafted ethylene / propylene copolymer rubber, fumaric acid grafted ethylene / 1-butene copolymer, ethylene / 1-hexene-itaconic acid copolymer, ethylene / propylene-endobicyclo [2.2.1] -5-heptene-2,3-dicarboxylic anhydride copolymer, ethylene / Propylene-methacrylic acid graft glycidyl copolymer, maleic anhydride graft ethylene / propylene / 1,4-hexadiene copolymer, fumaric acid graft ethylene / propylene / dicyclopentadiene copolymer, maleic acid graft ethylene /
Propylene / norbornadiene copolymers and acrylic acid-grafted ethylene / vinyl acetate copolymers, and generally ethylene-based ionomers marketed under the trade names "Surlyn", "Himilan", "Corporene", etc. The polyolefin may be used alone or in combination of two or more.

The melt flow rate of the modified polyolefin used in the present invention is 0.01 to 400 g / 10.
Those in the range of minutes can be arbitrarily selected, and especially 0.1 to 5
0 g / 10 minutes is preferable.

The modified polyolefin is produced by a known method, for example, Japanese Patent Publication No. 53-41173 and Japanese Patent Publication No.
It can be manufactured according to the method shown in, for example, 6-9925.

The polypropylene resin (C) used in the present invention is a propylene homopolymer or a propylene copolymer. Here, as the propylene copolymer, there are a propylene-ethylene copolymer, a propylene-butene-1 copolymer and the like, and a block copolymer or a random copolymer thereof is used. The polypropylene resin may be used alone or in combination of two or more kinds.

The melt flow rate (MFR) of the polypropylene resin at 230 ° C. is preferably 1 to 50 g / 10 minutes, particularly preferably 2 to 20 g / 10 minutes.

The mixing ratio of each component in the resin composition for producing the saturated polyester fiber of the present invention is from (A) to
It is as follows with respect to the total amount of the component (C). (A) Saturated polyester resin is 94.5 to 51% by weight,
It is preferably 80 to 60% by weight, and more preferably 75 to 65% by weight. 51 saturated polyester resin
If it is less than wt%, the bulkiness of the resulting composition is not sufficiently improved. On the other hand, if it exceeds 94.5% by weight, the compounding ratio of the component (C) decreases and the original properties of the polypropylene resin such as processability, toughness, water resistance and chemical resistance are lost. The (B) modified polyolefin resin is 0.5 to 9% by weight, preferably 1 to 7% by weight, and more preferably 1 to 5% by weight. When the content of the modified polyolefin resin is less than 0.5% by weight, the saturated polyester resin as the component (A) and (C)
It is difficult to improve the compatibility with the component polypropylene resin, and as a result, desired properties may not be imparted to the resulting composition. On the other hand, if the (B) modified polyolefin resin exceeds 9% by weight, molding, especially stretching cannot be performed. The (C) polypropylene resin is 5 to 40% by weight, preferably 19 to 33% by weight, more preferably 24 to 30% by weight. If the content of the polypropylene resin is less than 5% by weight, the resin composition cannot be imparted with the original properties of polypropylene such as processability, toughness, water resistance and chemical resistance.
On the contrary, if it exceeds 40% by weight, heat resistance is not sufficiently exhibited.

The resin composition according to the present invention contains the above three components (A), (B), and (C) as main components, but if necessary, other additives may be added to the properties of the above components. You may add in the range which does not inhibit. Additives that can be blended here include dyes, pigments, fillers, nucleating agents, fibrous materials,
Examples thereof include a plasticizer, a lubricant, a release agent, a coupling agent, a foaming agent, a heat resistance agent, a weather resistance agent, a flame retardant, an antistatic agent and a sliding agent.

The resin composition according to the present invention is prepared by mixing or kneading the respective components in the above-mentioned mixing ratio. The mixing is carried out by using a Banbury mixer, a Henschel mixer, etc. A twin-screw or twin-screw extruder is used. The order of blending is not particularly limited, and the components may be blended sequentially or simultaneously.
Further, the components (B) and (C) may be blended with the powdery or pelletized component (A) after completion of the polymerization reaction. The temperature at the time of melt-kneading depends on the components, blending amount, etc.
The temperature at which each component melts sufficiently and does not decompose may be appropriately selected. It is usually selected in the range of 180 to 350 ° C, preferably 200 to 300 ° C.

The saturated polyester fiber of the present invention can be obtained by melt spinning, air cooling and hot drawing the above resin composition. The apparatus used for spinning may be a general multifilament molding apparatus, and the spinning temperature is generally 27.
The temperature is 0 to 310 ° C, preferably 280 to 290 ° C. Two
If the temperature is lower than 70 ° C, spinning breakage tends to occur, and if the temperature exceeds 310 ° C, the polyolefin component is remarkably deteriorated, resulting in deterioration of spinnability and physical properties of the fiber.

The drawing may be carried out after the multifilament tow is once obtained, but it may also be carried out continuously during spinning. The stretching temperature is 80 to 150 ° C., preferably 90 to 12
It is 0 ° C. If it is less than 80 ° C., the stretchability is extremely lowered and a fiber having sufficient physical properties cannot be obtained. On the other hand, if the temperature exceeds 150 ° C, there is a risk that the fibers will be fused and the melted fibers will stick to the drawing roller.

The fineness of the saturated polyester fiber of the present invention is about 1 to 50 denier as a single yarn. It is difficult to make fibers having a fineness of 1 denier or less by a normal spinning method, while fibers having a fineness of more than 50 denier are too thick to make uniform cooling difficult. .

[0025]

EXAMPLES Next, the present invention will be described in more detail based on Examples and Comparative Examples. The various physical properties of the saturated polyester fibers obtained in the following examples are measured based on the following test methods.

(Tensile strength and elongation) JIS-L10
In accordance with No. 70, the measurement was carried out at a constant speed tension type, a grip interval of 30 cm, and a pulling speed of 30 cm / min.

(Initial Tensile Resistance) Based on JIS-L1073, the tensile strength and elongation were measured under the same conditions.

(Drawing ratio) The draw ratio was defined as the ratio of the set speeds of the first roller and the final fourth roller, which are spinning rolls.

(Bulkiness index) A sample fiber having a diameter of 21.7 m
Wrap it around a m steel pipe and put it in a dryer at 130 ° C.
After leaving it for 10 minutes, take it out, cool it to room temperature, apply an initial load (JIS-L1073) to the sample, and measure it correctly 300 mm.
Measure (L), hit two points, and measure the length (L ₁ ) between the two points after removing the initial load. Further, the denier (D) of the fiber was measured, and the bulkiness index was calculated from the following formula. The larger the bulkiness index, the better the bulkiness. Bulkiness index = {(L−L ₁ ) × 100} / (L × D)

Examples 1 to 3 Polyethylene terephthalate (PET-1) having an intrinsic viscosity of 0.68 was used as the saturated polyester resin, and M was used as the modified polyolefin resin.
An ethylene-methacrylic acid copolymer having an FR (190 ° C) of 300 g / 10 minutes and a methacrylic acid content of 20% (M
PE-1) and polypropylene resin, MFR (2
Propylene homopolymer (P at 30 ° C.) of 13 g / 10 min (P
P-1) was mixed in a predetermined amount shown in Table 1 and dry-mixed for 5 minutes by a Henschel mixer, and the obtained mixture was a twin-screw extruder with a vent (inner diameter 30 mm, L /
D = 17) was melt-kneaded at 280 ° C. to prepare pellets.

After heating and drying the pellets under reduced pressure,
Using a 40 mmφ extruder, extrusion was carried out at an extrusion temperature of 290 ° C. from a multifilament spinning die having a nozzle diameter of 0.86 mmφ and 12 holes. The extruded molten strand was cooled with a cooling duct having a length of 900 mm at a cooling temperature of 13 ° C. and a cooling air velocity of 0.5 m / min, and then stretched by the first to fourth rollers at different stretching ratios, and then wound on a winding roll. It was wound up to obtain a multifilament. As the result is shown in Table 2, a flexible fiber having good bulkiness was obtained.

(Examples 4 to 8) Saturated polyester resin,
A modified polyolefin resin and a polypropylene resin were blended in the predetermined amounts shown in Table 1, and the same operation as in Example 1 was carried out to obtain a flexible and good bulky fiber. In addition, M
PE-2 is an ethylene-glycidyl methacrylate-vinyl acetate copolymer having an MFR (190 ° C) of 20 g / 10 minutes and contents of glycidyl methacrylate and vinyl acetate of 12% by weight and 5% by weight, respectively.

(Comparative Example 1) 70% by weight of PET-1 and P
The same operation as in Example 1 was carried out using 30% by weight of P-1, but spinning was impossible.

(Comparative Examples 2 to 3) The same operation as in Example 1 or 2 was carried out using only PET-1, but the obtained fiber had poor flexibility.

(Comparative Example 4) 10% by weight of MEP, PP-
The same operation as in Example 1 was carried out except that 20% by weight of 1 was used, but spinning was possible, but stretching was not possible.

Comparative Examples 5-6 Using PP-1 only,
The same operation as in Example 1 or 2 was performed, but the obtained fiber had poor bulkiness.

[0037]

[Table 1]

[0038]

[Table 2]

[0039]

As described above, the saturated polyester resin fiber of the present invention has the excellent bulkiness of the saturated polyester, and at the same time has the excellent flexibility of the blended polypropylene. It is a fiber composed of a resin composition having properties and can be widely and effectively utilized as a material requiring bulkiness and flexibility, for example, a material such as carpet pile, clothing, and non-woven fabric.

Claims (1)

[Claims] 1. A saturated polyester resin (A) 94.5-
51% by weight, (B) modified polyolefin resin 0.5 to 9
%, And (C) 5 to 40% by weight of polypropylene resin, a saturated polyester fiber.