DE1469111A1 - Improved Highly Crystalline Polyolefin Filaments and Processes for Their Production - Google Patents

Description

PATENT LAWYERS

DR.-ING. BY KREISLER DR.-ING. SCHÖNWALD 1469111 Dt.-ING. TH. MiYER DR. FUES

COLOGNE 1, DEICHMANNHAUS Or.-Ιαβ. Uöpufc

Montecatinl SooietA Generale per l'Induatrla Mlneraria e Chimica, 1-2 Largo Quldo Donegani, "Milan (Italy)

Improved threads made from highly crystalline polyolefins

The invention relates to improved, particularly high-tensile mono- and plurifiles made from crystalline olefin polymers, in particular from polypropylene produced with stereospecific catalysts and a process for their production.

In previous proposals, the manufacture of mono- and plurifiles by extrusion of olefin polymers, in particular Polypropylene, already described in the molten state. The mono- and plurifiles obtained by the known processes already have a considerable tensile strength which, however, generally does not exceed 6 to 7 g / den.

It has now surprisingly been found that polyolefinic Mono- and Plurifile very high tensile strength and normal

'Ler elongation can be obtained by crystalline polyolefins, in particular polypropylene consisting essentially of isotactic macromolecules with an intrinsic viscosity / JqJ between 2 and 5, which were pressed in the molten state through a spinneret with a length / diameter ratio preferably greater than 1 , as threads when leaving the spinneret through a ^{tubular device heated to 130 ° to 30O 0} C, which is immediately

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Intorl

is arranged behind the spinneret and is 2 to 5 µm larger in diameter than the SplnndUsendurohmesser and «Ine · Has a length of 2 cm to 1 m, directs and then curls up.

The process according to the invention can be applied both to polyolefins, in particular polypropylene, and to mixtures of polyolefins with, for example, color modifiers, stabilizers, matting agents, pigments or dyes.

Basic sticks obtained by condensation of epichlorohydrin with amines are preferably used as color modifiers Substance compounds are used, while the preferred stabilizer is a mixture consisting of 0.02 to 2 wt.

The extruded threads are then stretched in ratios between 1: 2 and 1:10 at temperatures between 80 ° and 150 ° C in stretching devices heated with hot air, steam or a similar medium or over a heated plate stretched.

After stretching, the threads can undergo thermal shape stabilization treatments under free conditions or hindered shrinkage as well as conventional band treatments.

The threads obtained from mixtures of polyolefins with color modifiers can also be used before or after the Stretching, for example, let formaldehyde, diisocyanates or diepoxy compounds act.

The invention is illustrated in the following examples, which are compiled in tabular form. Example 6 shows the

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This is the same limit of the treatment according to the invention. Surprisingly, it was found that a treatment below 150 ^° C. noticeably reduces the tensile strength of the polypropylene fibers.

46911: 1

Tabel

Composition of the mixture

a) polypropylene #

Limiting viscosity (determined in tetrahydronaphthalene at 130)

Ash content

Residue after heptane extraction

b) caloium stearate
o) stabilizer i »

Lauryl thiodipropionate

4,41-thiobis-3-tert-butyl-metacresol Spinning conditions: snail temperature

Spinning head temperature Pin nozzle ent emperature Spinneret type

Temperature of the heated tubular device below the ¹ spinneret

Maximum pressure (kg / cm)

Take-up speed (m / minute;

Streek conditions: temperature

medium

Stretch ratio Properties of the pre-stretched fibers:

Tensile strength (g / den)

Tendon (jt)

example 1 00 5, οι i ο, 00 Jl 94, 3 ο, 6th 0, 2 0,

230 ° 235 ° 285 ° 40 / 0.8x16 mn

160 ° 30

600
130 ° steam It 8.3

9
18th

-S-

Example 2 Example 3 Example 4 Example 5 Example 6 2.50 3.00 3.00 2.00 3.00 0.02 rf 0.01 rf 0.04 rf 0.02 rf 0.01 rf 94.5 rf 94.00 rf 95.6 rf 96.1 rf 94.00 rf 0.3 0.3 0.3 0.3 0.3 0.6 0.5 0.6 0.5 0.6 0.2 0.2 0.2 0.2 0.2 230 ° 230 ° 240 ° 230 ° 230 ° 230 ° 230 ° 240 ° 240 ° 235 ° 270 ° 250 ° ' 295 ° 285 ° 285 ° 40 / 0.8x16mm. 50 / l »3x26mm . ■ 20 / 0.4x8mm 20 / 0.4x0.8 40 / 0.8xl & 140 ° 130 ° 280 ° 270 ° 110 ° * 25th 30th 45 35 30th 600 80 240 320 600 130 ° 150 ° 130 ° 135 ° 130 ° steam steam Warm air Warm air steam Ii8.5 1:10 1: 6.28 1:10 1: 8.3 8.8 9.5 14.5. 11.5 5.8 20th 12th 23 20th 14th

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Claims (7)

Claims 1.) Process for the production of particularly high tensile strength threads based on crystalline polyolefins, in particular on the basis of polypropylene consisting essentially of isotactic macromolecules with a QrenEViskosi- did between 2 and 5 duroh melt spinning and subsequent · Stretching, characterized in that the from the Threads emerging from the nozzle through a directly behind the spinneret, at temperatures in the range between two * 150 ° and 300 ° C heated tubular device, whose Diameter 2 to 5 cm larger than that of the spinneret and which is 2 to 1 cm long, directs and stirs up danaoh. 2.) The method according to claim 1, characterized in that organic or inorganic pigments containing polyolefin · used in bulk. 3.) Method according to claim 1 or 2, characterized in that that one uses mixtures of crystalline polyolefins and nitrogen color modifiers. 4.) Method naoh claim 1 to 3, characterized by that mixtures are used which contain mixtures of 0.02 % of an aliphatic thioester, a dialkylphenol sulfide and potassium stearate as a stabilizer. 5.) Method according to claims 1 to 4, characterized by that the threads are treated with formaldehyde, isocyanates or diepoxide compounds before or after drawing. 6.) Method according to claims 1 to 5, characterized by that the threads with Streok ratios between Ii2 'and 1:10 at temperatures between 80 ° and 150 ⁰ O In with Hei 6- 809808/0664 New bobbin thread (Art7 | iAiÄ2Nr.i8ito3 * eÄiKi * runo> flMbV! .Aibl »» i - • Streokvorriohtungen heated by steam or a similar medium or stretched over a heated plate. 7.) Tensile textile thread based on crystalline polyolefins, especially polypropylene «characterized by a content of a stabilizer consisting of 0.02% of an aliphatic thioester, a dialkylphenol sulfide and CaIoiumsfcearat in addition to basic polymeric nitrogen compounds obtained by condensation of epichlorohydrin with amines as color modifiers. BU9ÖUÖ / Ub64