Claims
- 1. A monofil or a bristle of a homopolymer or copolymer of acrylonitrile consisting of at least 90% by weight of acrylonitrile units and having a relative viscosity, as measured in a solution of 0.5 g of the polymer in 100 ml of dimethylformamide at 20.degree. C., of 1.7 to 6.0,
- and the monofil or bristle having a tear strength (tenacity) of from 20 to 60 CN/tex and an initial modulus, for 100% extension, of more than 700 to 1,800 cN/tex and a linear density (denier) of from 2.5 to about 30 tex.
- 2. The monofil or bristle as claimed in claim 1 wherein the relative viscosity of the acrylonitrile polymer is between 2.5 and 3.5.
- 3. The monofil or bristle as claimed in claim 1 wherein the copolymer comprises at least 99% by weight of acrylonitrile units.
- 4. In a process for producing a monofil or bristle of a homopolymer or copolymer of acrylonitrile as claimed in claim 1,
- in which monofils or bristles are produced by solvent spinning and subsequent spinning into a coagulant bath, with a wet stretch followed by a hot stretch in steps comprising
- preparing a spinning solution of the polymer in an aprotic solvent, spinning the solution into a coagulation bath,
- wet-stretching the resulting filaments at a stretch ratio of at least 1:4, the wet stretching being carried out before, during or after a washing out of the residual solvent, drying the thus stretched filaments under tension and then subjecting the filaments to at least one hot stretch at temperatures above 120.degree. C. in a stretching ratio of at least 1:2, the effective overall stretch being at least 1:8.
- 5. The process as claimed in claim 4 wherein the filaments are stretched with slight shrinkage.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3406910 |
Feb 1984 |
DEX |
|
Parent Case Info
This application is a continuation of application Ser. No. 704,781 filed Feb. 25, 1985, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1170011 |
Jul 1984 |
CAX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
704781 |
Feb 1985 |
|