Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1998-05-15
1999-12-14
Group, Karl
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
501 63, 501 64, 501 67, C03C 3093
Patent
active
060017546
DESCRIPTION:
BRIEF SUMMARY
The invention relates to compositions for opalescent glass, that is, compositions for the production of articles or substrates made of opalescent glass. Such articles or substrates are obtained in particular from compositions inducing the formation of microcrystals distributed in their thickness, imparting a more or less marked "clouded" and "cottony" appearance.
The perfume and cosmetics industries increasingly are demanding articles, such as bottles or jars, made of opalescent glass. The production of these articles has in particular the purpose of altering the presentation of the products deriving from these industries, in particular from an aesthetic point of view.
If the invention is not limited to such applications, it nonetheless will be described in greater detail in reference to the applications contemplated by the perfume and/or cosmetics industries, in particular in order to simplify the understanding thereof.
The inventors therefore set themselves the task of defining glass compositions for the production of articles made of opalescent glass.
Research led the inventors to produce such articles from glass compositions comprising in particular fluorine, an element capable of ensuring the germination of crystals. This research made it possible to produce such articles having opalescent, non-opaque walls having a satisfactory light transmission for the contemplated applications. On the other hand, aging tests for said articles under storage conditions similar to those to which they are intended to be subjected prior to filling revealed various problems.
To begin with, it was established that storage conditions in a confined atmosphere, the articles being subjected to fluctuations in temperature and humidity, lead to the formation of offensive, persistent odors, of the vinegar-odor type. The formation of such odors is, of course, completely unacceptable for the applications contemplated by the perfume and cosmetics industries.
Moreover, the aging conditions tested also disclosed the formation of a greasy gel on the surface of the glass. The formation of such a greasy film on the surface requires a washing and/or scouring of the articles prior to filling. These operations lead to very significant costs and, in addition, must be implemented by the filling industries and not by the container manufacturers, which also makes this drawback unacceptable.
During their analysis of the problems which have just been cited, the originators of this invention were able to demonstrate the assumed source of said problems. As a matter of fact, it would appear that the glass compositions used did not have a sufficient hydrolytic resistance.
The purpose of the invention thus is compositions for opalescent glass having an improved hydrolytic resistance, considering the results presented.
It furthermore is known to produce glass substrates comprising crystals in their thickness leading to a complete opacity; it involves substrates obtained from compositions of opaline glass. Such compositions are described in particular in patent application WO-96/06052. This application describes in particular the substitution of phosphorus-based compounds in place of fluorine-based compounds, in order to improve the coefficient of thermal expansion.
The previously set purpose is achieved according to the invention by a composition for opalescent glass of the borosilicate type including, in addition, the oxides below within the following limits by weight:
The various glass compositions used corresponding to this definition in effect make it possible to produce articles having in particular a satisfactory hydrolytic resistance for applications such as those of interest to the perfume and/or cosmetics industries. As a matter of fact, bottles or jars do not have, after a storage under conditions such as those cited previously, any greasy film or any odor which may be detrimental to their use or requiring additional cleaning stages prior to filling.
Furthermore, the glass compositions, such as defined, may be melted, then put to use with n
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Avisse Claude
Fosse Lucien
Group Karl
Saint-Gobain Emballage
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