Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1983-11-29
1985-01-29
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
5282953, 528300, 528301, C08G 6366, C08G 6368
Patent
active
044967160
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a thread with a proportion of a basic-dyeable, texturised polyester filament.
Polyester filaments which have an affinity for basic dyestuffs have already been disclosed, and are obtained, for example, according to Swiss Pat. No. 373,559, by adding metal sulphonates. According to U.S. Pat. No. 3,772,872, such polyesters can even be melt-spun in a high-speed process. The preferred additives are sulphonic acid salts which contain the grouping ##STR2## where M denotes a monovalent metal, and are added in the course of the preparation of polyethylene terephthalate.
However, these polyester filaments have the disadvantage that their mechanical properties, specifically their strength, are poor, in particular when they have been subjected to a false-twist draw-texturising operation. For this reason they, alone or together with other synthetic and/or natural fibres or filaments, are difficult to process.
On the other hand, U.S. Pat. No. 2,865,891 discloses that non-basic-dyeable polyesters with polyalkylene glycols containing the grouping --)--(C.sub.n H.sub.2n O).sub.z -- where 2.ltoreq.n.ltoreq.10 and 10.ltoreq.z.ltoreq.150 in the molecular chain are used for preparing yarns having improved dyeability with disperse dyestuffs. Polyesters modified in such a way can, according to U.S. Pat. No. 3,772,872, even be spun in a high-speed method. However, the addition of polyalkylene glycols to polyesters yields no improvement in respect of mechanical properties of draw-texturised filaments prepared therefrom.
It is an object of the present invention to prepare a thread containing basic-dyeable texturised polyester filaments, having improved mechanical yarn properties and being easier to process.
The invention relates to a thread with a proportion of a basic-dyeable, texturised polyester filament in which proportion the basic-dyeable polyester filament contains a metal sulphonate having the structural unit ##STR3## where M is equal to Na or K, and a compound A containing the structural units --(CH.sub.2).sub.y -- and/or --O--(C.sub.x.sbsb.1 H.sub.2x.sbsb.1 O).sub.y.sbsb.1 -- where x.sub.1 .gtoreq.2, y.gtoreq.20 and x.sub.1.y.sub.1 .gtoreq.20.
The additives having the abovementioned structural units are incorporated into the polyester chain in the course of an esterification or transesterification. In the case of compound A it can also be present as a separate phase.
The polyester thread modified according to the invention is surprisingly strong, which fact enables efficient processing, alone or together with other synthetic and/or natural filaments or staple yarns. This modified thread is, moreover, white, and has, in addition to good textile properties, a particularly good affinity for basic dyestuffs. Furthermore, dyed with disperse dyestuffs it gives a relatively deep shade.
For the purposes of the invention, a filament is a yarn comprising several individual filaments.
The polyesters can be prepared in a conventional manner, for example in the case of copolyesters with polyethylene terephthalate either by directly condensing ethylene glycol and terephthalic acid or by transesterifying dimethyl terephthalate with ethylene glycol and then polycondensing the diglycol terephthalate formed as an intermediate. It is possible to replace ethylene glycol by other diols, such as 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol or cyclohexanedimethanol, and to use in addition to terephthalic acid or dimethyl terephthalate other dicarboxylic acids, such as isophthalic acid, adipic acid, azelaic acid or dimeric fatty acid or the alkyl esters of these acids.
The sulphonic acid salt and compound A are added at or before the start of the polycondensation phase, preferably before the start of the esterification of terephthalic acid or transesterification of the dialkyl terephthalate with the glycol. The elimination of water or methanol in the course of the esterification or transesterification and of the glycol in the course of the subsequent polycondensation is effected in a known manner by means of catalysts
REFERENCES:
patent: 3018272 (1962-01-01), Griffing et al.
patent: 3104450 (1963-09-01), Christens et al.
patent: 3922250 (1975-11-01), Cleary
patent: 4250296 (1981-02-01), Weckler et al.
patent: 4390687 (1983-06-01), Tung
patent: 4403094 (1983-09-01), Sasaki et al.
Humbrecht Remy
Schmieder Heinrich
Phynes Lucille M.
Viscosuisse S.A.
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