Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1995-11-14
1997-04-01
Gorr, Rachel
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
5282953, 528301, 25218227, 568616, 568619, 568698, C08G 1848
Patent
active
056166796
DESCRIPTION:
BRIEF SUMMARY
The present application was filed under the provisions of 35 USC 371 as the U.S. National Phase of PCT/EP94/01553 filed May 13, 1994, and published as WO94/26804 Nov. 24, 1994.
BACKGROUND OF THE INVENTION
This invention relates to polyalkylene glycol, to its production and to its use.
DISCUSSION OF RELATED ART
"Polyalkylene glycols" are understood to be predominantly linear polyethers corresponding to the following general formula: group R is a difunctional radical which contains. 2 H atoms less than the corresponding alkane compound at two different C atoms. Known polyalkylene glycols are, for example, polyethylene glycol (R=CH.sub.2 CH.sub.2), polypropylene glycol (R=CH.sub.2 --CH.sub.2 (CH.sub.2)) or polytetramethylene glycol (R=CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2). They are generally prepared by polyaddition of the corresponding cyclic ethers onto water or dihydric alcohols. The known polyalkylene glycols are liquid, wax-like or solid products according to their molecular weight. They are widely used. Above all, they are used as diol component in the production of polyurethanes and polyesters. They provide above all for an improvement in hydrolytic stability by comparison with the corresponding polyester diols. In addition, they are used for the production of nonionic emulsifiers, surfactants or wetting agents and as solvents, plasticizers or solubilizers.
Low molecular weight diols, for example ethylene glycol, hexanediol, decane-1,10-diol, 1,4-cyclohexane dimethanol or dimer diol, are used for similar purposes.
The dimer diol has been known for some time. Thus, its production by dimerization of unsaturated fatty alcohols with basic alkaline earth metal compounds at more than 280.degree. C. was described, for example, about 30 years ago in DE 11 98 348. It may also be prepared by hydrogenation of dimeric fatty acids and/or esters thereof in accordance with DE-B-17 68 313. Suitable adducts are dimerization products of monounsaturated and/or polyunsaturated fatty acids and/or esters thereof, for example dimerization products of oleic acid, linoleic acid, linolenic acid, palmitoleic acid, elaidic acid and/or erucic acid and/or esters thereof. Particularly preferred adducts are dimerization products of monounsaturated or polyunsaturated fatty acid mixtures of the type obtained in the hydrolysis of natural fats and/or oils, for example olive oil, sunflower oil, soybean oil, cottonseed oil/coriander oil and/or tall oil. Depending upon the reaction conditions selected for the dimerizations known per se, varying amounts of oligomeric fatty acids and/or residual quantities of monomeric fatty acids or esters thereof may be present in addition to dimer fatty acids. If the dimerized fatty acids or fatty acid esters contain relatively large quantities of monomeric fatty acids or fatty acid esters, it may be advisable to remove them by distillation, preferably as fatty acid esters of lower C.sub.1--4 alcohols, after or before hydrogenation to the dimer diols. The hydrogenations of the dimerized fatty acids or esters thereof may be carried out in accordance with DE-B-17 68 313 in the presence of copper- and/or zinc-containing catalysts in typical continuous pressure hydrogenation reactors with gas circulation. Under these conditions, not only are the carboxyl groups of the fatty acids hydrogenated to hydroxyl groups, double bonds still present in the dimerized fatty acids or their esters may also be partly or completely hydrogenated. However, the hydrogenation may also be carried out in such a way that the double bonds remain fully intact during the hydrogenation reaction. In this case, unsaturated dimer diols are formed, optionally in admixture with trimer triols and residual monomers. However, the hydrogenation is preferably carried out in such a way that the double bonds are at least partly or completely hydrogenated. Another method of preparing completely saturated dimer diols is to convert saturated dimer fatty acids into the corresponding saturated dimer diols by hydrogenation. Another method of preducin
REFERENCES:
patent: 3188353 (1965-06-01), Holtschmidt
patent: 3296317 (1967-01-01), Stein et al.
Fies Matthias
Gr utzmacher Roland
Westfechtel Alfred
Gorr Rachel
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Szoke Ernest G.
Wood John Daniel
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