Preparations containing wax

Details Preparations containing wax Preparations containing wax

1999-08-17

2000-04-18

Green, Anthony

Compositions

Leather or fur treating

106 10, 106 1829, 106272, C14C 902, C08L 9106, A01N 2700

Patent

active

060511559

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

This invention relates to preparations containing wax for the treatment of wooden and leather surfaces.
Wax-containing preparations in the form of solvent-based pastes, free-flowing powders, dispersions in organic solvents, liquid or pasty emulsions with or without solvent, mixtures with synthetic materials or wax aerosols are known for preserving wooden and leather surfaces.
According to their origin the waxes are divided into three groups: waxes and petrochemical waxes,
As far as these waxes are used for preserving wooden or leather surfaces, they do not offer protection against the damaging influence of visible and short-wave light of the U.V. range of wavelengths from 280 to 800 nm, so that the surfaces of wooden furniture, leather seating furniture, leather shoes, leather bags and leather clothing become discolored already after a relatively short period while they are being exhibited and stored or during usage. Organic absorbents are not very effective, because the preparations containing wax are applied only in relatively thin layers on wooden and leather surfaces; moreover, most of the organic absorbents are not without health hazards.
It is the object of the present invention to provide preparations containing wax for the treatment of wooden and leather surfaces, which preparations ensure a permanent protection against the damaging effect of light rays in the range of wavelengths from 280 to 800 nm.
This object is solved in that the wax-containing preparations have a content of micronized transparent titanium dioxide with a crystallite size of 5 to 50 nm. Such preparations provide for a long-term protection of wooden and leather surfaces against the damaging influence of visible and shortwave light of the U.V. range of wavelengths from 280 to 800 nm. The titanium dioxide particles can be stirred easily into the molten wax-containing preparations of low viscosity and in doing so are distributed homogeneously. In addition, the titanium dioxide particles can easily be dispersed in liquid emulsions.
One preferred aspect of the invention should be seen in that the content of micronized titanium dioxide is 0.05 to 20 wt-%. This is an advantageous content of titanium dioxide, which ensures a sufficient stability against light radiation of the U.V.-A and U.V.-B ranges.
The titanium dioxide particles may include an inorganic doping.
The titanium dioxide particles may also be subjected to an advantageous doping with alumina or zirconia. The doping of the titanium dioxide particles improves the weather resistance.
An organic coating of the titanium dioxide particles enhances their wettability and dispersibility.
Subject-matter of the invention also is the use of the wax-containing preservatives, where as titanium dioxide its rutile modification is used to preserve wooden and leather surfaces located in open rooms or outside, i.e. which are exposed directly to atmospheric influences.
As regards the preservation of the surfaces of wooden and leather articles accommodated in closed rooms, it was found to be advantageous when the titanium dioxide particles consist of the crystal modification anatase.
The invention will subsequently be described in detail with reference to a comparative embodiment.
A commercially available furniture wax (Antikwachs) was applied onto the surface of a first beechwood board. A second beechwood board was coated with a commercially available furniture wax to which 10% of a conventional U.V. absorbent (e.g. benzophenone) had been admixed. Furniture wax, in which 10 wt-% of a finely divided titanium dioxide of the rutile modification with a crystallite size of about 20 nm (according to Scherrer) had been uniformly dispersed; was applied onto the surface of a third beechwood board. Subsequently, the three coated beechwood boards were inserted in a Q.U.V.-quick weathering apparatus which provides for a simulation of the damaging influence of the U.V. light in order to predict the stability against U.V. radiation. The U.V. lamps mainly generate a U.V. light with wavelengths in

REFERENCES:
patent: 5250289 (1993-10-01), Boothroyd et al.
patent: 5911974 (1999-06-01), Brieva et al.
Chemical Abstract No. 109:24320, abstract of Japanese Patent Specification No. 63-066273 (Mar. 1988).
Patent Abstract of Japan, vol. 012, No. 297 (C-519) Aug. 12, 1988 & JP 63 066273 A (Idemitsu Kosan Co Ltd), Mar. 25, 1988.

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