Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1997-12-11
1999-03-30
Raimund, Christopher
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428378, 191455, 442377, 139425R, B32B 900
Patent
active
058886524
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a fiber blend comprising
Fibers composed of melamine-formaldehyde condensation products are known, for example from DE-B-23 64 091. They are incombustible, flame resistant and heat resistant. Owing to these properties, they are used for manufacturing fire resistant textiles. However, there are applications for which the fibers are not sufficiently strong and there are applications where their low abrasion resistance is a disadvantage.
The disadvantage of natural fibers is that they require the addition of flame retardants to render them nonflammable. However, flameproofed natural fibers such as cotton lose some of the flame retardant in the course of washing, and the result is an increased risk of fire, for example in the case of welders, suits.
It is an object of the present invention to improve the properties of melamine resin fibers on the one hand and the properties of natural fibers on the other.
We have found that this object is achieved by the above-defined fiber blend. This invention further provides fiber blends additionally including other fibers and/or metal fibers or conductive polymer fibers and also a process for their production and the use of the fiber blends of this invention for producing wovens, nonwovens, yarns, tapes and moldings and the use of melamine resin fibers for producing the fiber blends of this invention.
According to DE-B-23 64 091, the melamine resin solution used for spinning the melamine resin fibers may have added to it, during spinning, solutions of other fiber-forming polymers, including solutions of polyamides in organic solvents. Preference is given to adding to the melamine resin solution aqueous solutions of polyvinyl alcohol as a way of improving the mechanical properties of the fibers produced by the spinning process. This reference thus involves spinning mixtures or solutions of different polymers to produce multicomponent fibers (blends of polymers within a single fiber), whereas the present invention involves blending various ready-produced single-component fibers to produce fiber blends (blends of different fibers). and incombustibility. Their production and properties are known, for example from DE-A-23 64 091. They are preferably produced from highly concentrated solutions of melamine-formaldehyde precondensation products after addition of an acidic curing agent, by centrifugal spinning, drawing out, extrusion or fibrillation. The fibers obtained are generally predried and optionally stretched, and the melamine resin is customarily cured at from 120.degree. to 250.degree. C. The fibers are typically from 5 to 25 .mu.m in thickness and from 2 to 2,000 mm in length. Particularly thermally stable fibers are obtained when up to 30 mol %, in particular from 2 to 20 mol %, of the melamine in the melamine resin is replaced by a hydroxyalkylmelamine, as described in EP-A 221 330 or EP-A 523 485. Such fibers have a sustained use temperature of up to 200.degree. C., preferably up to 220 .degree. C. In addition, minor amounts of melamine can be replaced by substituted melamines, urea or phenol. Particular preference is given to condensation products obtainable by condensation of a mixture including as essential components ##STR1## where X, X' and X" are each selected from the group consisting of --NH.sub.2, --NHR and --NRR', and X, X' and X" are not all --NH.sub.2, and R and R' are each selected from the group consisting of hydroxy-C.sub.2 -C.sub.10 -alkyl, hydroxy-C.sub.2 -C.sub.4 -alkyl-(oxa-C.sub.2 -C.sub.4 -alkyl).sub.n, where n is from 1 to 5, and amino-C.sub.2 -C.sub.12 -alkyl, or mixtures of melamines I, and unsubstituted or substituted by radicals selected from the group consisting of C.sub.1 -C.sub.9 -alkyl and hydroxyl, C.sub.1 -C.sub.4 -alkanes substituted by two or three phenol groups, di(hydroxyphenyl) sulfones, or mixtures thereof, with melamines to formaldehyde within the range from 1:1.15 to 1:4.5.
The following compounds are substituted melamines particularly suitable for this invention: 2-(2-hydroxyethylamino)-4,6-dia
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Berbner Heinz
Eichhorn Hans-Dieter
Ott Karl
BASF - Aktiengesellschaft
Raimund Christopher
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