Compositions: coating or plastic – Coating or plastic compositions – Coating repellent
Patent
1995-01-23
1997-06-03
Bonner, Melissa
Compositions: coating or plastic
Coating or plastic compositions
Coating repellent
106 3, 106 11, 10628714, C09G 102, B08B 304, B08B 700
Patent
active
056349653
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a substantially liquid, aqueous, rare earth oxide based composition for preserving the lustre of the smooth surfaces of objects needing to have such an appearance.
2. Technological Background
The invention applies more specifically, though not exclusively, to the preservation of surfaces of glazings of the so-called semi-reflective type, that is, glazings on which one of the surfaces is rendered partially reflective of luminous rays by being coated with a thin layer of metal compounds, such as metal oxides.
The thickness of the above-mentioned layer is generally between zero point three and one point two micrometers (0.3 and 1.2 .mu.m).
It will be noted that the composition of the invention can also be applied to the surfaces of objects made of natural materials as diverse as polyvinyl chloride, stainless steel, varnish paint, copper, and marble.
Whatever the case may be, semi-reflective type glazings have the characteristic of being sensitive to certain atmospheric agents which considerably alter the lustre of their partially reflective surface.
When thus altered, these glazings lose their transparency at the part of the luminous spectrum at which they are initially transparent, but still tend to become absorbent for a large part of the luminous spectrum, which tends to raise their temperature and goes contrary to the thermal insulation effects sought in the field of these semi-reflective glazings.
The lustre of the partially reflective surface of these glazings must therefore be regularly maintained, that is, cleared of the elements which alter it.
In the field of cleaning glazings, particularly in order to eliminate the potential build-up of silicone, it has long been known (GB-A-1.267.509) to use a composition consisting of a combination of at least one detergent agent and at least one metal oxide powder, such as a cerium oxide powder.
This type of composition is criticized for being especially subject to the phenomenon of syneresis and, moreover, for sensitizing the semi-reflective glazings to the action of the altering atmospheric agents.
Also, in the field of polishing optical surfaces, there are known polishing compositions such as that described in the patent application (GB-A-2.011.939).
Such polishing compositions contain cerium oxide particles whose diameter is between one and fifty microns, which gives them a highly abrasive quality and prevents their use for the preservation of glazings of the above-mentioned type.
The abrasive composition described in the patent application (EP-A-0.336.651) would also be unsuitable for the preservation of glazings of the above-mentioned type because it contains, in particular, abrasive particles whose diameter is between thirty and five hundred microns.
SUMMARY OF THE INVENTION
A first object that the invention seeks to obtain is a composition for the preservation of the lustre of the smooth surfaces of objects needing to have such an appearance, a composition which has no destructive effects on any metal oxide coating which may comprise the surface thus treated.
A second object that the invention seeks to obtain is a composition for the preservation of the lustre of semi-reflective glazings which has a protective effect on this surface, that is, which impedes its alteration by atmospheric agents.
A third object which the invention seeks to obtain is a composition of the above-mentioned type which would be stable over time, that is, which would especially not be subject to syneresis.
Toward this end, the subject of the invention is a composition of the above-mentioned type, particularly characterized in that: with an average diameter of less than two micrometers (2 .mu.m), and, degreasing agent for diluting the polysiloxane oil.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention will be better understood with the aid of the description below, given as a non-limiting example.
As indicated, the composition is substantially liquid, aqueous, and constituted of a rare earth
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patent: 3981826 (1976-09-01), Munro
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patent: 4218250 (1980-08-01), Kasprzak
patent: 4347333 (1982-08-01), Lohr et al.
patent: 5094687 (1992-03-01), Elepano
Chemical Abstract citation 111:102561, corrisponding to JP 63-212462, Sep. 5, 1988.
Chemical Abstract citation 110:40609, corrisponding to JP 63-197586, Aug. 16, 1988.
Chemical Abstract citation 95:117209, corrisponding to JP 56-57863, May 20, 1981.
Database WPI Section Ch, Derwent Publications Ltd., London Class A97, AN 87-252489 [36] & JP, A, 62 172 099 (Daicel Chem Ind KK) 29 Jul. 1987--See Abstract.
Database WPI Section Ch, Derwent Publications Ltd., London GB; Class A97, AN 87-252488 [36] JP,A, 62 172 098 (Daicel Chem Ind KK) 29 Jul. 1987--See Abstract.
Database WPI Section Ch, Derwent Publications Ltd., London, GB; Class D25, AN 85-220442 [36] JP, A, 60 141 799 (Watanabe M) 26 Jul. 1985--See Abstract.
Bonner Melissa
Kondracki Edward J.
Lotigie S.A.
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