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Monofilament yarn and process for producing same

A manufacturing method and monofilament technology, which is applied in the direction of single-component polyester rayon, thin material handling, transportation and packaging, etc., can solve the problems of low elastic recovery rate, poor bristle erection, low degree of polymerization, etc. Achieve the effect of good shape stability, high napping and good processability

Inactive Publication Date: 2003-05-28
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the PTT monofilament prepared under this condition has low toughness and low elastic recovery rate due to low intrinsic viscosity (that is, low degree of polymerization).
Therefore, when used for bristles, the bristles will split or the bristles will separate due to abrasion and soaking in a short period of time.
[0010] In addition, in the examples of document (D), since the heat setting conditions after the stretching process are not suitable, the residual heat shrinkage rate is high
Therefore, in the hair-planting process of the toothbrush, due to the heat generated when the hair tip is trimmed (the hair tip is trimmed) or the end is rounded (the hair tip is rounded), the bristles become bent or the hair tips are separated, etc., and the bristle erection ( Linearity) Variation
In addition, due to heat treatment such as high-temperature sterilization treatment after the brush is formed, there are also problems such as deformation or twisting of the bristles, and separation of the bristles, and it is an unsatisfactory material for the bristles.

Method used

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  • Monofilament yarn and process for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] Using a PTT polymer having an intrinsic viscosity [η] of 0.92 dl / g and a titanium oxide content of 0.1% by weight, a PTT monofilament was produced under the following production conditions.

[0103] Polymer output: 2.52g / min

[0104] Spinning temperature: 260°C

[0105] Cooling bath water temperature: 40°C

[0106] Peripheral speed of traction roller (1st roller): 15.8m / min

[0107] Stretching bath water temperature: 55°C

[0108] Peripheral speed of stretching roller (2nd roller): 79.2m / min

[0109] Heat treatment bath steam temperature: 120°C

[0110] Peripheral speed of the third roller: 72m / min

[0111] Winding speed: 72m / min

[0112] The physical properties of the PTT monofilament produced under the above-mentioned production conditions are as follows.

[0113] Intrinsic viscosity: 0.90dl / g

[0114] Diameter: 0.18mm

[0115] Denier: 355dtex

[0116] Breaking strength: 3.0cN / dtex

[0117] Elongation at break: 48.1%

[0118] Boiling water shrinkage: 6.4% ...

Embodiment 2～6

[0126] A PTT monofilament and a toothbrush were produced in the same manner as in Example 1 except that heat treatment was performed under the heat treatment conditions shown in Table 1. Table 1 shows the physical properties and bending recovery properties of the obtained PTT monofilament and the evaluation results of the toothbrush.

Embodiment 7

[0128] Using a PTT polymer with an intrinsic viscosity [η] of 1.13dl / g and a titanium oxide content of 0.1% by weight, a PTT monofilament was produced under the same manufacturing conditions as in Example 1, and heat treated under the same heat treatment conditions as in Example 3, A PTT monofilament is produced. A toothbrush was produced in the same manner as in Example 1 using the obtained monofilament.

[0129] Table 1 shows the physical properties and bending recovery properties of the obtained PTT monofilament and the evaluation results of the toothbrush.

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Abstract

A polytrimethylene terephthalate monofilament yarn which is excellent in flexibility, flex recovery, and durability in long-term use. It is characterized by being made of a polytrimethylene terephthalate comprising 90 mol% or more trimethylene terephthalate repeating units and 10 mol% or less repeating units of another ester and by having a single yarn fineness of 50 dtex or higher, an intrinsic viscosity of 0.8 to 1.3 dl / g, and a shrinkage in boiling water of 2% or lower.

Description

technical field [0001] The present invention relates to polytrimethylene terephthalate (hereinafter referred to as PTT) monofilament, its manufacturing method, and a brush using the monofilament. technical background [0002] Conventionally, monofilaments made of thermoplastic resins such as nylon have been widely used as raw materials for bristles of toothbrushes, cosmetic brushes, hair brushes, and various industrial brushes. For example, for toothbrushes, nylon 612 is often used as bristles from the viewpoint of soft feeling, less pain on teeth or gums, and good elasticity recovery. However, nylon has high hygroscopicity, and after moisture absorption, the physical properties and elastic recovery properties are reduced, or the size becomes larger, so when it is continued to be used as a brush, the bristles are easy to separate, and there are durability problems. In addition, there is also a problem that the raw material cost of the resin is high. [0003] In addition, P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/62
CPCD01F6/62Y10T428/2969Y10T428/2913
Inventor 结城康式松尾辉彦小柳正
Owner ASAHI KASEI KK
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