Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic -co- compound
Patent
1993-10-27
1996-10-29
Acquah, Samuel A.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic -co- compound
528297, 528300, 528301, 525437, 428364, 428480, 427 11, 427170, 427412, 252 884, 252 886, 26417717, C10M11916, C10M14538
Patent
active
055694080
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/EP92/00894 filed Apr. 23, 1992.
The present invention relates to new water-soluble and biologically degradable carbonic acid polyesters (polycarbonates) and their use as preparation agents and lubricants for synthetic yarns.
To permit machine-processing of synthetic fibers and yarns made of polyester, polyamide, polypropylene, polyacrylonitrile, and even of regenerated cellulose at high speeds and without wear and breakage antistatic, friction-reducing oils having a low volatility and a high flash point are used. In general, thin-bodied water-insoluble mineral oils, ester oils, or polyether are used as base components for such "spinning assistants" (e.g., described in U.S. Pat. No. 3,338,830); they are adjusted to water-miscibility according to the respective requirements by means of emulsifiers.
As the rate of the mechanical processing of synthetic fibers increases, in particular if used under the severe conditions of friction texturizing, the mechanical and thermal stability of fiber processing agents has gained increasing importance. In case of products comprising mineral oil, undesired cracking residues or tarry deposits on the surfaces of heating rails frequently result in costly interruptions of production. A certain type of polyalkylene glycol ether carbonate has been proposed to solve this problem (Japanese Patent No. 195437/83 or European Patent No. 0146234). However, with respect to structure and synthesis only water-insoluble products or those emulsifiable in water could be obtained. The use of ethylene-(propylene)-oxide adducts of fatty alcohols which are self-emulsifiable in water proved to be advantageous, they could be present in the form of block or random adducts (with random sequences). However, due to their structure, they lacked both the wetting action and the biodegradability.
It is accordingly the object of the present invention to provide thin-bodied, water-soluble and biodegradable products having an excellent wetting action and high thermal stability and which are suitable for the use as spinning assistants, i.e., as preparation agents and lubricants for synthetic yarns.
Said object is achieved by new carbonic acid polyesters of the general formula: ##STR3## wherein: R.sub.1 is a linear or branched, saturated or mono-unsaturated alkyl residue with 6 to 22 C-atoms, ##STR4## n is an integer from 0 to 10, m is an integer from 5 to 16,
As compared to the conventionally manufactured products, the new oligomeric low-viscosity carbonic acid esters of polyalkylene glycols have a lower solidification point, a more favorable consistency at room temperature, an improved hydrophilicity, they exhibit wetting action and are biodegradable.
The present invention is based on the surprising finding that by introducing ester groups in the form of carbonic acid ester groups the condensation of water-insoluble primary alcohols and partially water-soluble alkyl-poly-ethyleneglycol ethers of such alcohols with polyalkylene glycol can be carried out in such a manner that an intensification of the hydrophobic properties, as is normal in ester formations, does not occur and that instead water-soluble compounds result. As is usual for polycondensates, the monofunctional primary alcohol has a limiting effect on the molar mass of the total molecule. Thus the following structures result for the new fiber preparations: ##STR5## b) incomplete condensation: ##STR6## having the following meanings: R.sub.1 : linear or branched, saturated or monounsaturated alkyl residue having 6 to 22 C-atoms,
The substituent R.sub.2 contained in the polyalkylene glycol ether block may either be the same or different, if present repeatedly in each case. In the latter case they are adducts of ethylene and propylene oxide with block or random sequences.
The molecule obtained by complete condensation can be divided into a central hydrophilic block and two terminal hydrophobic residues. Therefore, polyethylene glycol is preferably used as condensation component. Adducts with propylene oxide comprise at l
REFERENCES:
patent: 3338830 (1967-08-01), Stokes et al.
patent: 4314000 (1982-02-01), Thir et al.
Goossens Bernhard
Peppmoller Reinmar
Winck Karl
Acquah Samuel A.
Chemische Fabrik Stockhausen GmbH
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