Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Reexamination Certificate
2003-05-21
2004-11-02
Edwards, N. (Department: 1774)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
C428S374000, C428S364000, C428S399000
Reexamination Certificate
active
06811876
ABSTRACT:
DESCRIPTION
The present invention relates to a fiber containing a longitudinal core (I) of a polymer and a chemically different surrounding sheath (II), wherein said sheath (II) is based on a polyamide containing a sterically hindered piperidine derivative (III) attached to the polymer chain by chemical bonding.
The present invention further relates to the use of such a fiber for producing yarn, fabric and carpet.
The use of polymers, especially polyamides, for producing fiber and yarn is generally known, for example from: Ullmann's Encyclopedia of Industrial Chemistry, 5
th
Ed., Vol. A10, VCH Verlagsgesellschaft mbH, Weinheim, Germany, 1987, pages 567-579.
Yarn is produced in a conventional manner by melting the polyamide, spinning the polyamide into a fiber, drawing and texturing this fiber and optionally aftertreating the fiber. This is customarily followed by cabling and heat setting of the yarn.
According to Dictionary of Fiber & Textile Technology, Hoechst Celanese Corporation, Charlotte, N.C. 28232, USA, 1990, p. 159, texturing, which also comprehends crimping, serves to increase yarn cover.
When carpet is produced from such yarn, a high crimp is desirable because high yarn cover means that less yarn is needed to cover a carpet.
It is an object of the present invention to provide a fiber from which yarn having improved crimp can be produced.
We have found that this object is achieved by the fiber defined at the beginning and the use of this fiber for producing yarn, fabric and carpet.
According to the invention, the fiber contains a longitudinal core (I) of a polymer.
Useful polymers advantageously include polymers that are meltable and spinnable from the melt, such as polyamides, polyesters, polyolefins, preferably polyamides, polyolefins, especially polyamides.
Polyamides are herein to be understood as being homopolymers, copolymers, blends and grafts of synthetic long-chain polyamides having recurring amide groups in the polymer main chain as an essential constituent. Examples of such polyamides are nylon-6 (polycaprolactam), nylon-6,6 (polyhexamethyleneadipamide), nylon-4,6 (polytetramethyleneadipamide), nylon-6,10 (polyhexamethylenesebacamide), nylon-7 (polyenantholactam), nylon-11 (polyundecanolactam), nylon-12 (polydodecanolactam). As well as polyamides known by the generic name of nylon, polyamides further include the aramids (aromatic polyamides), such as poly-meta-phenyleneisophthalamide (NOMEX® fiber, U.S. Pat. No. 3,287,324) or poly-para-phenyleneterephthalamide (KEVLAR® fiber, U.S. Pat. No. 3,671,542).
Polyamides can in principle be prepared by two methods.
In a polymerization from dicarboxylic acids and diamines and also in a polymerization from amino acids or their derivatives, such as aminocarbonitriles, aminocarboxamides, aminocarboxylate esters or aminocarboxylate salts, the amino and carboxyl end groups of the starting monomers or starting oligomers react with one another to form an amide group and water. The water can subsequently be removed from the polymer. In a polymerization from carboxamides, the amino and amide end groups of the starting monomers or starting oligomers react with one another to form an amide group and ammonia. The ammonia can subsequently be removed from the polymer. This polymerization reaction is customarily known as a polycondensation.
A polymerization from lactams as starting monomers or starting oligomers is customarily known as a polyaddition.
Such polyamides are obtainable by conventional processes, described for example in DE-A-14 95 198, DE-A-25 58 480, EP-A-129 196 or in: Polymerization Processes, Interscience, New York, 1977, pages 424-467, especially pages 444-446, from monomers selected from the group consisting of lactams, omega-aminocarboxylic acids, omega-aminocarbonitriles, omega-aminocarboxamides, omega-aminocarboxylate salts, omega-aminocarboxylate esters, equimolar mixtures of diamines and dicarboxylic acids, dicarboxylic acid/diamine salts, dinitriles and diamines or mixtures thereof.
Useful monomers include
monomers or oligomers of a C
2
to C
20
, preferably C
2
to C
18
, arylaliphatic or, preferably, aliphatic lactam such as enantholactam, undecanolactam, dodecanolactam or caprolactam,
monomers or oligomers of C
2
to C
20
, preferably C
3
to C
18
, aminocarboxylic acids such as 6-aminohexanoic acid or 11-aminoundecanoic acid, and dimers, trimers, tetramers, pentamers or hexamers thereof, and salts thereof such as alkali metal salts, for example lithium, sodium or potassium salts,
C
2
to C
20
, preferably C
3
to C
18
, aminocarboxylic acid nitriles such as 6-aminocapronitrile or 11-aminoundecanoic acid nitrile,
monomers or oligomers of C
2
to C
20
amino acid amides such as 6-aminohexanamide or 11-aminoundecanamide, and dimers, trimers, tetramers, pentamers or hexamers thereof,
esters, preferably C
1
-C
4
alkyl esters, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl or s-butyl esters, of C
2
to C
20
, preferably C
3
to C
18
, aminocarboxylic acids, such as 6-aminohexanoic acid esters, for example methyl 6-aminohexanoate, or 11-aminoundecanoic acid esters, for example methyl 11-aminoundecanoate,
monomers or oligomers of a C
2
to C
20
, preferably C
2
to C
12
, alkyldiamine, such as tetramethylenediamine or, preferably, hexamethylenediamine,
with a C
2
to C
20
, preferably C
2
to C
14
, aliphatic dicarboxylic acid or mono- or dinitriles thereof, such as sebacic acid, dodecanedioic acid, adipic acid, sebacic acid dinitrile, decanoic acid dinitrile or adiponitrile,
and dimers, trimers, tetramers, pentamers or hexamers thereof,
monomers or oligomers of a C
2
to C
20
, preferably C
2
to C
12
, alkyldiamine, such as tetramethylenediamine or, preferably, hexamethylenediamine,
with a C
8
to C
20
, preferably C
8
to C
12
, aromatic dicarboxylic acid or derivatives thereof, for example chlorides, such as naphthalene-2,6-dicarboxylic acid, preferably isophthalic acid or terephthalic acid,
and dimers, trimers, tetramers, pentamers or hexamers thereof,
monomers or oligomers of a C
2
to C
20
, preferably C
2
to C
12
, alkyldiamine, such as tetramethylenediamine or, preferably, hexamethylenediamine,
with a C
9
to C
20
, preferably C
9
to C
18
, arylaliphatic dicarboxylic acid or derivatives thereof, for example chlorides, such as o-, m- or p-phenylenediacetic acid, and dimers, trimers, tetramers, pentamers or hexamers thereof,
monomers or oligomers of a C
6
to C
20
, preferably C
6
to C
10
, aromatic diamine, such as m- or p-phenylenediamine,
with a C
2
to C
20
, preferably C
2
to C
14
, aliphatic dicarboxylic acid or mono- or dinitriles thereof, such as sebacic acid, dodecanedioic acid, adipic acid, sebacic acid dinitrile, decanoic acid dinitrile or adiponitrile,
and dimers, trimers, tetramers, pentamers or hexamers thereof,
monomers or oligomers of a C
6
to C
20
, preferably C
6
to C
10
, aromatic diamine, such as m- or p-phenylenediamine,
with a C
8
to C
20
, preferably C
8
to C
12
, aromatic dicarboxylic acid or derivatives thereof, for example chlorides, such as naphthalene-2,6-dicarboxylic acid, preferably isophthalic acid or terephthalic acid,
and dimers, trimers, tetramers, pentamers or hexamers thereof,
monomers or oligomers of a C
6
to C
20
, preferably C
6
to C
10
, aromatic diamine, such as m- or p-phenylenediamine,
with a C
9
to C
20
, preferably C
9
to C
18
, arylaliphatic dicarboxylic acid or derivatives thereof, for example chlorides, such as o-, m- or p-phenylenediacetic acid,
and dimers, trimers, tetramers, pentamers or hexamers thereof,
monomers or oligomers of a C
7
to C
20
, preferably C
8
to C
18
, arylaliphatic diamine, such as m- or p-xylylenediamine,
with a C
2
to C
20
, preferably C
2
to C
14
, aliphatic dicarboxylic acid or mono- or dinitriles thereof, such as sebacic acid, dodecanedioic acid, adipic acid, sebacic acid dinitrile, decanoic acid dinitrile or adiponitrile,
and dimers, trimers, tetramers, pentamers or hexamers thereof,
monomers or oligomers of a C
7
to C
20
, preferably C
8
to C
18
, arylaliphatic diamine, such as m- or p-xyl
Bernstorff Bernd-Steffen von
Bever Paul-Michael
Conzelmann Gerhard
BASF - Aktiengesellschaft
Edwards N.
Keil & Weinkauf
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