DE2148348A1 - Flame resistant satd polyester - contg red phosphorus added to raw materials for polyester prepn - Google Patents

Abstract

Flame resistant linear satd. polyesters are obtd. by adding 0.5-10 wt.% red phosphorus in particle form 0.15, pref.0.001-0.01 mm in size to the raw materials (contg. inorg., pref. glass, fibres) during prepn. of the polyester, the phosphorus being more easily mixed with raw materials than with finished polyester. Ignition risks are greatly reduced.

Description

Use of red phosphorus containing polymers for the position of flame retardant threads and fibers === === == === = = = = = = == = = = = - = - = == == - - = The invention relates to the use of deformable from the melt Polymers for the production of flame-retardant or self-extinguishing threads and fibers.

It is known that the addition of red phosphorus in casting resins such as effective fire protection even with thermoplastics and foamed plastics leads (BE-PS 715 11o, BE-PS 752 166; US-PS 3,373,135, GB-PS 1,112,139, GB-PS 1,147 009, GB-PS 1,157,419; DAS 1,173,641; DOS 1 965 635, DOS 1 944 56, DOS 1 812 512).

It is also known cellulosic molded products with reduced Flammability, in particular to produce threads, fibers, yarns, films and fiber webs, which contain 1 - 25 percent by weight, based on the cellulose content, of red phosphorus (DOS 1 944 056).

The object of the present invention is to provide flame-retardant threads and Manufacture fibers from melt-spinnable polymers.

This object was achieved in that deformable from the melt Polymers to which red phosphorus has been added during polymer manufacture is used to make threads and fibers.

The red phosphorus is in the form of particles, their mean grain size is less than or equal to lo / u (in diameter), preferably aler in the range of 1 lAi.s 3 / u has been added.

The concentration of red phosphorus in the one used in the invention Polymers deformable from the melt is expediently depending on the flame protection requirements between 0.5 and 10 percent by weight, preferably between 1 and 5 percent by weight, based on the weight of the polymer.

It has been suggested for polyester, the finely powdered red Acute phosphorus with the diol component, and this slurry under more extensive Elimination of the risk of ignition of the reaction protection under a nitrogen atmosphere to add.

The red phosphorus can also correspond to the other starting monomers have been added during polymer production. Surprisingly, can The polymers produced in this way are perfectly spun from the melt and without Difficulty drawing threads and fibers with high strength.

The choice of red phosphorus as the flame retardant to be mixed in has the advantage that when the threads and fibers are burned, all of the phosphorus Remains in the ashes and does not escape in volatile form, as with the halogen-containing ones Flame retardants where harmful argas - hydrogen halide - is produced.

The polymers used in the present invention have those for melt spinning usual viscosities.

In addition to the red phosphorus, the polymers could also contain the usual additives such as matting agents, pigments, etc.

Polyesters or polyamides can be used as linear melt-spinnable polymers can be used, e.g. polyesters of terephthalic acid with diols with 2 - 10 carbon atoms in the molecule and the well-known mixed polyesters and as polyamides poly- caprolactam and polyhexamethylene adipamide. Polyethylene terephthalate is preferred.

The threads and fibers according to the invention are flame-retardant or self-extinguishing; tested on the 47irk hose iiacli DTN 54 331 (bogen testcr) Illit BaumwoJ Lunter Jn! E.

It is particularly noteworthy that, despite the red phosphorus content high-strength threads can be obtained, which are used e.g. for technical articles can, especially for coated fabrics.

Example 1: A polyethylene terephthalate of relative viscosity 1.8, measured in the Ostwald viscometer on a 1 percent by weight solution in phenol / tetrachloroethane in a weight ratio of 3: 2, which contained 1.5 percent by weight of red phosphorus according to patent application P 21 26 923.8, at 280 ° C from the melt spun into threads that were drawn in a ratio of 1: 3.65. The titer was dtex 56f24. The strength was 3.5 p / dtex with an elongation at break of 20%. the Color was pale pink.

Example 2: A polyethylene terephthalate was spun and drawn as in Example 1, but with 3 percent by weight of red phosphorus. Between the textiles There are no data differences between the burn test on the knitted hose according to DIN 54 331 (Sheet tester) with cotton underlay Burning time Burning time¹) Angle2) PÄT Comp. without red lo "323" 1800 I'lloshor PÄT with 1.5% red. Phos. lo "63" 930 (example 1) PÄTi with 3% red. Phos. lo "49" 910 (Ex. 2) 1) Burning time: time after which the flame is extinguished 2) Angle: Angle that the flame reaches before it is extinguished example 3: A polyethylene terephthalate with a phosphorus content as in Example 1, however with a relative viscosity of 2.0, was spun at 2900 and in two stages drawn with a total draw ratio of 1: 9. The titer was dtex 110f20, the strength 7.2 p / dtex, the elongation 16%, the shrinkage 1.5% at 16o0C. The flame test proceeded like in example 1.

Claims (3)

PATENT CLAIMS: 1. Use of melt-deformable polymers, those red Phosphorus has been added during polymer production to produce flame retardant or self-extinguishing threads and fibers. 2. Use of polyethylene terephthalate, the red phosphorus during has been added to manufacture for making filaments and fibers. 3. Use of polyethylene terephthalate according to claim 2 for the production of threads and fibers, characterized in that the polyesters 0.5 - lo percent by weight, based on the finished polyester, contain red phosphorus.