JPS5819360A - Electrically conductive polymer composition - Google Patents

Abstract

PURPOSE:To provide a polymer compsn. excellent in electric conductivity and color tone and is suitable for production of electrically conductive conjugate fiber, prepared by adding particulate cuprous iodide and conductive carbon black particles to a polymer. CONSTITUTION:15-60wt% particulate cuprous iodide particles (A) with a particle diameter of 10mu or smaller and a specific resistivity of 10<2>OMEGA.cm or lower and 2-25wt% electrically conductive carbon black particles (B) with a particle diameter of 1mu or smaller and a specific resistivity of 10<2>OMEGA.cm or lower (e.g. acetylene black) are added to a polymer so that the resultant polymer compsn. may contain 20-70wt% A and B in total and have a specific resistivity of 10<6>OMEGA.cm or lower. EFFECT:When the polymer compsn. is used for a conjugate fiber which has such a cross sectional shape that part or the whole of the compsn. is covered with other delustering agent-contg. white colored polymers, the resultant fibre has a near-white color and can be dyed evenly without formation of deep-colored streaky dyeing specks caused by the presence of carbon black.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conductive polymer composition, particularly a polymer composition suitable for producing conductive composite fibers with excellent color tone.

One effective means of imparting antistatic properties to textile products is to incorporate conductive car pump hook particles, and this method has been widely used in recent years, mainly in carpets, work clothes, and the like. However, this method has a problem with the black color of the car pump hook, and if the car pump book is incorporated to an extent that has sufficient conductivity, it will not be possible to use fibers obtained simply by incorporating the car pump hook into the polymer. The black color of the fibers is easy to stand out even when a white polymer is spun into a core-sheath type or seabird type composite. Naturally, this tendency becomes more pronounced as the amount of carbon black increases, and various attempts have been made to reduce the amount of carbon black introduced.

On the other hand, in order to improve the drawbacks of such car pump hook-containing fibers, there is active research into fibers containing white conductive substances. Among them, conductive tin oxide and cuprous iodide are attracting attention because they are nearly white in color and easily mix with the melt or solution that forms fibers. However, when actually applied, the disadvantage is that the achieved electrical conductivity is lower than in the case of carbon black even if a large amount of tin oxide or cuprous iodide is added. This phenomenon is probably due to the fact that the stannic oxide particles and the sweetened primary steel particles are difficult to form chains (conductive paths) in the polymer, or because the chain formation is incomplete.

The present inventors had previously found that the conductivity of a polymer containing tin oxide was significantly enhanced by the presence of conductive carpump hook particles, but as a result of further investigation, it was found that The present invention was achieved based on the discovery that the conductivity of the polymer contained therein is also mutually enhanced by the conductive car pump hook particles.

That is, the gist of the present invention is a conductive polymer composition in which the polymer contains cuprous iodide particles (3) and conductive carbon black particles ω).

The composition of the present invention has a synergistic effect on electrical conduction between cuprous iodide and the conductive car pump hook (= an effect that occurs due to the formation of a chain between the first steel particles and the carbon black particles). The fibers have excellent electrical conductivity based on wax) and have a cross-sectional shape partially or completely covered by the polymer composition of the present invention, for example, a polymer containing a matting agent. cuprous chloride and matting agent)
This has the effect of canceling out the black color due to the oxidation process, and the effect of improving the color tone (white skin) by reducing the amount of car pump hooks introduced.

In the present invention, the primary iodide steel particles (4) preferably have a particle diameter of 10μ or less from the viewpoint of formability (thread-spinning property) and chain-forming property, and have a specific resistance of 10"Ω·1 or less. good.

Also, conductive carbon black particles) refers to car pump hook particles such as acetylene black, channel block, furnace black, thermal black, lamp hook, etc., which have good conductivity, and whose specific resistance is Those having a particle size of 1080·1 or less and a particle size of 1 μ or less are preferably used.

In addition, in the present invention, examples of polymers containing 9) include polyethylene terephthalate, liptylene terephthalate, poly-1,4-V chlorohexylene dimethylene terephthalate, polyP-ethyleneoxybenzoate, etc. In addition to thermoplastic polymers with good moldability, such as polyester, nylon 6I, nylon 66, etc., meliamid, polyethylene, pyrene, etc., which have these as main components, and polyolefins, which have these as main components. , vinylon, acrylic.

Polyurethane, polykufur, polyvinyl chloride.

Examples include fiber-forming polymers such as polyvinylidene chloride. When used as a component of composite fiber, 9 particles (A
In order to improve the dispersibility and mixability of l and (g), it is also possible to use a polymer that itself has poor moldability (fiber-forming properties).

The polymer composition of the present invention can be obtained by mixing particles V) and ω) with a polymer in a conventional manner, but the content of these particles is 15-60% by weight and 2-25% by weight, preferably 20-50% by weight and 4-20% by weight, respectively;
The specific resistance of the 9-polymer composition is preferably 5 to 60% by weight, preferably 1060.1 or less, preferably 104 Ω.flaw or less. Of course, these are determined by the required conductive performance, color tone, type of polymer, etc.

The conductive polymer composition of the present invention can be applied to various uses. Of these, it is particularly useful when used in composite fibers whose cross-section is partially or entirely covered with another white polymer. By having such a cross-sectional shape, conductive fibers with good color tone can be obtained. In this case, it is of course preferable that the white polymer is a fiber-forming polymer containing particles of titanium oxide, amiumina, s/rica, zeophyte, zinc oxide, acid-selective ability, etc. as a matting agent. It is.

1 to 8 schematically show preferred specific examples of such composite fibers. Figure 1.

Figure 2 shows a polymer containing conductive particles (shaded area) and a part of the polymer containing a matting agent (shaded area).
Figures 3 and 4 show examples completely covered, Figures 5 and 6 show examples covered with two types of white polymer, Figures 7 and 8 show examples covered with two types of white polymer. shows an example of a hollow cross-section yarn, but it is preferable to select it as appropriate depending on the use of the fiber and the requirements for conductive performance and color tone.

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

The electrical resistance value of the fiber in the example is I for a yarn with a length of 10 al.
The value is when a DC voltage of KV is applied, and the antistatic property was measured using a rotary static tester manufactured by Kaken, Kyoto University, in an atmosphere of 20°C and 40% R with cotton cloth as the friction body. This was done using a method to determine the frictional charging voltage. Also, unless otherwise stated, the polymers and the fibers used, which do not contain conductive particles, contain 2% by weight of titanium oxide particles as a matting agent.

Example 1 58 parts of primary iodized steel particles with a specific resistance of 5 Ω and a particle size of 1 to 5 μm with flaws and 10 parts of carbon black particles with a specific resistance of 1 Ω α and a particle size of 0.1 μm were mixed into 52 parts. was melt-mixed with nylon 6 to obtain chips. The specific resistance of this chip is 2
It was 10”Ω・trust.

This chip and a normal nylon 6 chip were spun using a normal extender type melt composite spinning device.

With the shapes shown in Figures 1 to 4, 7, and 8, the composite area ratio is 10:90 at a melting temperature of 270°C.
．． 4-Stainless x 4-hole spinneret;
The yarn was wound at a speed of win. Next, the polishing temperature was 50
℃, stretched at a stretching ratio of 3.7 times to 20 (174f)
A drawn yarn was obtained. A normal nylon 6 yarn made by combining this drawn thread with a 50d/20f drawn thread of normal nylon 6.
Tucked fabric consisting of (width and weft density each 100 pieces/2.54
ffi, constituent threads 70d/24f) were used as warp threads at a ratio of 1 thread/2.54 m. The fabric was then dyed in a blue acid dye at 100° C. for 1 hour.

Fibers of any cross-sectional shape can be spun, drawn, [1
The color tone of the drawn yarn was close to white, the dyed fabric was dyed tightly, and no dark streaks due to carpump hooks were observed. Furthermore, as shown in Table 1, the conductivity of the drawn yarn and the antistatic property of the fabric were good.

Table 1 Note (1) The degree of hollowness in Figures 7 and 8 is 10g6.

(2) In the case of normal nylon fibers and polyester μ fibers,
The electrical resistance value of the drawn yarn is about 10' Wtx.

The fabric exhibits a tribostatic voltage of 4-6 KV.

Examples 2-5. Comparative Examples 1 to 4 Table 2 shows the results of experiments conducted in Example 1 by changing the amounts of (A) and (Bl).

Table 2 Note (1) Specific resistance is the specific resistance of the polymer containing conductive particles.

The resistance value indicates the electrical resistance value of the drawn yarn, and the charging voltage indicates the frictional charging voltage of the fabric.

(2) Regarding the color tone, dyed fabrics were evaluated as 09 when dark streaks were not observed and 09 when no dark streaks were observed.

As is clear from this table, it can be seen that the coexistence of the 9M polycarbonate group 1 and carbon black is extremely effective for the nine conductive colors.

[Brief explanation of the drawing]

FIGS. 1 to 8 are schematic cross-sectional views showing specific examples of composite fibers partially using the polymer composition of the present invention. Patent applicant Unitika Co., Ltd.
Figure 8

Claims (1)

[Claims] 1.! ! An electrically conductive polymer composition comprising: (1) carbon steel particles and electrically conductive car pump hook particles. 2. The content of 1 and 2) in the polymer composition is 15 each.
~60% by weight, 2-25% by weight, and with (A))
The conductive polymer composition O according to claim 1, wherein the total content of O is 20 to 70% by weight.