Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1987-01-13
1988-04-05
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528272, 528275, C08G 6368, C08G 7500
Patent
active
047360143
DESCRIPTION:
BRIEF SUMMARY
Polyesters and their preparation by condensing glycols with dicarboxylic acids and dicarboxylic acid esters have already been described in large number and have in some instances become widely established. For instance, polyesters which are essentially obtained from terephthalic acid and ethylene glycol are used as fiber material.
It is also already known to prepare, by methods analogous to those for preparing acid-modified polyacrylonitrile fibers, acid-modified polyester fibers which can be dyed easily and in deep shades with basic dyes. For instance, U.S. Pat. Nos. 3,018,272, 3,164,566, 3,164,567 and 3,166,531 describe fiber-forming polycoesters which contain in the molecule a small amount of randomly distributed sulfo groups which are bonded to phenyl nuclei. Such products can be obtained for example by replacing a small portion of the dicarboxylic acid used by sulfoterephthalic acid or sulfoisophthalic acid.
The abovementioned polyesters are insoluble in water. Also already known are water-soluble or readily water-dispersible polyesters which are used for example as sizing agents for polyester yarns.
The processing of textile threads into textile material by weaving is only possible in practice if the warp yarn is treated before weaving with a sizing agent which has the function of conferring greater smoothness, suppleness, resistance and cohesion on the threads under the high mechanical stresses of weaving and hence of facilitating the weaving process and of reducing thread breakages and thread abrasion. In addition to the properties mentioned, a good sizing agent must also have a number of other specific properties, so that its use does not lead to production problems. For example, the sizing agent must not leave a tacky deposit on metallic yarn guides; the sized yarn should have a very low metal friction and not stick to other sized yarns or to apparatus parts. The sizing agent should be sufficiently soluble in water, and the ready-to-use aqueous solution must not form a skin, since this skin leads to stubborn soiling of the yarns and unpleasant production problems. The solution must remain homogeneous for a long time, so that no inadmissible concentration fluctuations arise, and the stability of the solution must even be retained in the presence of spin finishes which are inevitably carried over into the sizing baths in the course of sizing spin-finished yarns. (Spin finishes are indispensable for trouble-free spinning and therefore are present on all spun synthetic fibers.) It is also particularly important that after weaving the textile material can be completely freed from the sizing agent by simply rinsing or washing, since this is a prerequisite for troublefree further processing, such as, for example, dyeing.
The sizing agents used are increasingly products based on polycoesters. Austrian Pat. No. 229,040 discloses polycoesters from dicarboxylic acids, polyalkylene glycols having a molecular weight of above 6000 and polyfunctional, aliphatic alcohols, which are swellable or even soluble, up to a certain degree, in water. These products are supposed to be used, inter alia, as sizing agents. However, when used in this way these products do not produce the desired high yarn cohesion and are incompatible with customary spin finishes. They further have the disadvantage that they are not easily dissolved. Moreover, solutions of these products have extremely high viscosities even at very low concentrations.
German Auslegungsschrift No. 1,816,163 describes a process for preparing water-soluble linear polyesters, wherein (a) dicarboxylic acids, (b) diols and (c) dicarboxylic acids or diols with in each case a sulfonyl or sulfonate radical of an aromatic ring are condensed to an intrinsic viscosity of at least 0.3, at least 20 mol % of the diol component (b) consisting of a certain polyethylene glycol, and component (c) accounting for 8 to 45 mol % of the dicarboxylic acid or diol component. The polyesters are used as sizing agents.
German Pat. No. 2,438,379 discloses water-soluble or readily water-di
REFERENCES:
patent: 4104262 (1978-08-01), Schade
patent: 4167395 (1979-09-01), Engelhardt et al.
patent: 4215026 (1980-07-01), Login
patent: 4250296 (1981-02-01), Weckler et al.
patent: 4427557 (1984-01-01), Stockburger
Engelhardt Friedrich
Hintermeier Karl
Kleber Rolf
Klein Peter
Cassella Aktiengesellschaft
Phynes Lucille M.
LandOfFree
Water-soluble polycoesters, process for their preparation, and t does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Water-soluble polycoesters, process for their preparation, and t, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Water-soluble polycoesters, process for their preparation, and t will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2234398