Lubricants for elastic fiber

Details Lubricants for elastic fiber Lubricants for elastic fiber

2002-07-01

2004-11-23

Le, Hoa Van (Department: 1752)

Bleaching and dyeing; fluid treatment and chemical modification

Chemical modification of textiles or fibers or products thereof

C008S115600, C008S115550, C008S115650, C008S901000, C252S008840

Reexamination Certificate

active

06821301

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a spin finish for elastic fibers. More particularly, it relates to a spin finish for obtaining elastic fibers having excellent anti-tackiness properties and good antistatic properties.
BACKGROUND ART
With regard to the spin finish to be attached to elastic fibers in the process of spinning thereof, there have so far been proposed:
{circle around (1)} a method comprising suspending a solid metallic soap as an anti-tackiness agent to thereby produce a mold release effect (Japanese Kokoku Publication Sho-41-286 and Japanese Kokoku Publication Sho-40-5557), a method comprising using a polyether-modified silicone which is a liquid substance at ordinary temperature (Japanese Kokoku Publication Sho-45-40719 and Japanese Kokai Publication Sho-48-19893), and so forth; and
{circle around (2)} a method comprising adding, as an antistatic agent, a phosphate type anionic surfactant such as an alkyl phosphate metal salt (Japanese Kokoku Publication Sho-41-21956).
However, the methods mentioned above under {circle around (1)} have a problem in that even the addition of such an anti-tackiness agent is almost ineffective in reducing the volume resistivity. In the case of suspending a solid metallic soap, in particular, it is a problem that the spin finish is poor in storage stability. As for the method mentioned under {circle around (2)}, the compatibility between the antistatic agent and a base oil is poor and they attach to fibers only poorly; thus the problem is that no satisfactory antistatic effect can be obtained and the anti-tackiness property and antistatic property can never be produced simultaneously.
SUMMARY OF THE INVENTION
Accordingly, it is a primary object of the present invention to provide a spin finish for elastic fibers which is excellent in antistatic property and can effectively prevent elastic fibers from tacking with one another in the process of production of elastic fibers.
Another object is to provide a spin finish for elastic fibers which shows good storage stability when a solid metallic soap is suspended therein.
The present inventors made intensive investigations in an attempt to develop the spin finish of the type mentioned above and, as a result, have now completed the present invention.
The invention has five aspects, as mentioned below.
Invention According to the First Aspect
A spin finish for elastic fibers
which comprises an amphoteric surfactant (A1) and/or a cationic surfactant (A2) as well as a base oil (B) and
has a surface tension thereof at 25° C. of 14 to 35 mN/m and a volume resistivity thereof at 20° C. of 1×10
7
to 1×10
13
&OHgr;·cm.
Invention According to the Second Aspect
A spin finish for elastic fibers
which comprises an ionic surfactant (A) and a base oil (B) and has a surface tension (S) thereof at 25° C. of 14 to 22.5 mN/m and a volume resistivity (&rgr;) thereof at 20° C. of 1×10
7
to 1×10
13
&OHgr;·cm,
&rgr; and S satisfying the following relation [1]:
&rgr;≦1×10
(−2.4S+61)
  [1]
Invention According to the Third Aspect
A spin finish for elastic fibers
which comprises a quaternary ammonium salt (A2-11) represented by the following general formula (6), a base oil (B) and a higher fatty acid (C
5-30
) metal salt powder (C):
in the formula, R
11
, R
12
and R
13
each independently is a group selected from among an alkyl, alkenyl, hydroxyalkyl and polyoxyalkylene group containing 1 to 30 carbon atoms and groups represented by the formula R
5
—T—R
6
— (R
5
represents the residue of a C
1-30
fatty acid after removal of the COOH group therefrom, R
6
represents an alkylene or hydroxyalkylene group containing 1 to 4 carbon atoms and T represents —COO— or —CONH—); R
14
is an alkyl, alkenyl, hydroxyalkyl or polyoxyalkylene group containing 1 to 30 carbon atoms; any two of R
12
, R
13
and R
14
, together with N, may combinedly form a heterocyclic ring; and Q
1
−
is an organic acid anion derived from an organic acid-modified silicone.
Invention According to the Fourth Aspect
A method of treating an elastic fiber
which comprises providing an elastic fiber with any of the spin finish mentioned above in an amount of 0.1 to 12% by weight of said fiber.
Invention According to the Fifth Aspect
An elastic fiber
which is obtainable by the above treatment method.
The surface tension (S: mN/m) of the spin finish at 25° C. and the volume resistivity (&rgr;: &OHgr;·cm) of the spin finish at 20° C. are measured by the following methods.
Method of Measuring the Surface Tension of the Spin Finish at 25° C.
A 25-g of the spin finish sample conditioned at 25° C.±1° C. is weighed in a glass dish having an inside diameter of 80 mm and a depth of 15 mm and subjected to measurement on an automatic surface tensiometer (product of Kyowa Kaimen Kagaku; Wilhelmie method).
Method of Measuring the Volume Resistivity of the Spin Finish at 20° C.
The spin finish sample conditioned at 20° C.±1° C. is subjected to volume resistivity testing as described in the methods of testing of electrical insulation oils (JIS C 2101, para. 24, 1993) (the measurement temperature is 20° C.±1° C.).
In the following, the invention is described in detail.


REFERENCES:
patent: 4-352878 (1992-12-01), None
patent: 9-49167 (1997-02-01), None
patent: 11-12949 (1999-01-01), None
patent: 7-310281 (1999-11-01), None
patent: 2000-80561 (2000-03-01), None

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