Organic compounds -- part of the class 532-570 series – Organic compounds – Fatty compounds having an acid moiety which contains the...
Reexamination Certificate
1999-12-17
2001-11-13
Carr, Deborah D. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Fatty compounds having an acid moiety which contains the...
C554S156000, C554S168000
Reexamination Certificate
active
06316650
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a wax preparation, to a process for the preparation thereof, and to the use thereof.
Combinations of Ca soaps of montan wax acid and eaters of dihydric alcohols having a high degree of esterification have been produced industrially for a long time and are employed as waxes for the preparation of solvent pastes or as lubricants and release agents.
For use in solvent pastes, use is made in particular of esters of 1,2-ethanediol and/or 1,3-butanediol having degrees of esterification of >90%. The proportion of Ca soap in the mixtures is about 45% by weight, corresponding to a Ca content of about 1.5% by weight. Such products are, for example, “Wax OP®” and “Wax O®” from Clariant GmbH and “Wax OP®” from BASF.
These waxes are prepared by virtually complete reaction of the alcohol component with a calculated excess of acid, followed by neutralization of the excess acid by addition of Ca(OH)
2
. Since distribution of the Ca(OH)
2
is always difficult, an excess is used, which then has to be separated off by filtration or centrifugation. Characteristic properties of these products are a viscosity (DGF-M-III 8 (75)) of about 400 mPas and a drop point (DGF-M-III 3 (75)) of 99-105° C.
These products compete with synthetic waxes and natural waxes, such as, for example, carnauba wax.
For use in solvent pastes for shoe care, carnauba in particular offers the advantage that it forms solid, heat-stable and glossy pastes which are preferred over applications of pure montan wax derivatives. The disadvantage is that carnauba is not available in constant amounts and quality.
The object was therefore to prepare a product for “solvent-based paste” applications which has the same or better properties than carnauba, but can be produced economically in constant quality.
SUMMARY OF THE INVENTION
Surprisingly, it has been found that partial esters of polyhydric alcohols, for example glycerol, diglycerol, polyglycerol, trimethylolpropane, di-trimethylolpropane, pentaerythritol, dipentaerythritol, sorbitol and sorbitan N-alkylglucamines, in combination with the Ca soap of montan wax acid, prepared by a novel process, satisfy these requirements.
The invention thus relates to a wax mixture comprising
a) 10-80% by weight of partial esters of polyols with mono-carboxylic acids or monocarboxylic acid mixtures having a chain length of C
16
-C
36
;
b) 0-30% by weight of partial esters of polyols with polybasic carboxylic acids having a chain length of C
4
-C
36
; and
c) 20-90% by weight of alkaline earth metal soaps of the abovementioned carboxylic acids or carboxylic acid mixtures, with the proviso that 1,2-ethanediol and 1,3-butanediol are excluded.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Particularly suitable are wax mixtures in which the proportion of OH groups in the alcohol component is ≧2, and in which polyhydric primary alcohols, their dimers or oligomers and/or their ethoxylation products or polyhydric alcohols containing primary and secondary OH groups are employed.
Preferred polybasic carboxylic acids here are dibasic and tribasic carboxylic acids.
The paste-forming action of the products can be further supported by the specific addition of dicarboxylic acids.
Particular preference given to, for example, citric acid tartaric acid, malic acid, itaconic acid, maleic acid, adipic acid, sebacic acid, dodecanedioc acid, dimeric fatty acid, phthalic acid or terephthalic acid.
The desired effect is achieved by preparing the partial esters in a first step by esterifying the polyols. The degree of esterification here is less than 90%, preferably between 30 and 70%. In a second step, a basic Ca compound, preferably Ca(OH)
2
, is then dispersed in the ester, which can be achieved without difficulties. Only then, in the third step, is the soap prepared by addition of wax acid. The proportion of soap can be adjusted to the optimum value by varying the Ca/montan wax acid amount and varies between 20 and 70% by weight, corresponding to a Ca content of 1-3% by weight.
The products having a Ca content of 1.6% by weight are characterized by a viscosity (DGF-M-III 8 (75)) of about 300 mPas and a drop point (DGF-M-III 3 (75)) of 105-115° C.
The wax mixtures according to the invention are highly suitable for the preparation of solvent pastes as a single component or in combination with synthetic, natural or semi-synthetic wax-like products and as lubricants and release agents in plastic and metal processing. They are also very highly suitable for the preparation of microfine wax powders.
Drechsler Monika
Heinrichs Franz-Leo
Henze Andree
Kapfer Werner
Carr Deborah D.
Clariant GmbH
Hanf Scott E.
Jackson Susan S.
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