MX2008007969A

MX2008007969A - Ink composition for marking glass and ceramic surfaces

Info

Publication number: MX2008007969A
Application number: MXMX/A/2008/007969A
Authority: MX
Inventors: Balazs Laszlo; Dudas Ferenc; Pilter Zoltan
Original assignee: General Electric Company
Priority date: 2005-12-29
Filing date: 2008-06-19
Publication date: 2008-09-26

Abstract

An ink composition for marking glass and ceramic surfaces, and for burning in said surfaces at an elevated temperature is disclosed, the composition comprising the following components:35-55%by weight pigment, 15-30%by weight lead-free frit, 20-45%by weight vehicle material, and the components constitute a total 100%by weight.

Description

COMPOSITION OF INK TO MARK GLASS AND CERAMIC SURFACES FIELD OF THE INVENTION This invention relates to an ink composition for marking glass and ceramic surfaces More particularly, this invention relates to a composition suitable for ink pad material, which can be used to prepare surface markings. glass or ceramic BACKGROUND OF THE INVENTION Marking, for example the name and logo of a manufacturer, a trade name or performance data of a product, are generally indicated on the products. Those that have glass or ceramic surfaces carry the marks on these surfaces. Such products are , for example, sources of light sources Moreover, labels, decorations and markings are also applied to the surface of homemade glass and ceramic products, as well as laboratory material. Marks, labels and decorations can be manufactured using ink materials. They are stamped on the glass and ceramic surfaces and then marked on fire so that the mark can be durable. Various compositions for ink materials are known to be suitable for stamping and marking, among other things, on foci of However, the known materials have lead content, which is undesirable. As of July 1, 2006, lead-containing preparations can not be used to mark glass portions of light sources in the European market, as declared in Directive 2002/95 / EC of the European Parliament and Council of Europe. This directive restricts the content of lead in different compositions, semi-finished products and finished products drastically. Considering that the restriction is mandatory for both manufacturers and distributors, products containing lead will not be manufactured or sold after the aforementioned date. U.S. Patent No. 1, 538, 890 discloses an ink composition for glass. This ink comprises an intimate mixture of about 70% by weight of silver oxide and about 30% by weight of lead borate, mixed in the proportion of about 65% by weight to about 35% by weight of glycerin. Due to the lead borate content of the ink composition, it does not meet the requirements for lead-free composition and is thus harmful to the environment. U.S. Patent No. 2,254,865 refers to ink and, more particularly, can be applied to the surface of glass or other soft material, to produce on it a monogram, trademark or other indication. The patented ink composition comprises about 73.7 wt% glycerin. This considerable amount of vehicle material is disadvantageous. In this way, there is a particular need for a ink composition, which meets the requirements of the aforementioned guideline and still good stamping properties, marked by fire and life time.

BRIEF DESCRIPTION OF THE INVENTION In an exemplary embodiment of the invention, an ink composition is provided for marking glass and ceramic surfaces, and for marking said surfaces at a high temperature. The ink composition comprises the following components: 35-55% by weight of pigment, 1 5-30% by weight of lead-free frit, 20-45% by weight of carrier material, and the components constitute a total of 100% by weight The mark can be marked by fire on the surface at an elevated temperature, with the help of thermal effect, for example, with a direct gas flame. This has an advantage that regular lamp making lines do not require change to use this ink. Additionally, such ink compositions are useful not only for marking glass bulbs in the lighting industry, but for decorative coatings and ornaments on the surface of glass and ceramic products. In addition, the proposed ink does not contain either lead or any other component, for example, cadmium, mercury or hexavalent chromium restricted by the European directive.

DETAILED DESCRIPTION OF THE INVENTION The proposed tire composition refers to a stamping material, which is suitable for and durable during manufacture and even during its additional product life time. The coloring characteristics have to be maintained even until the end of the product life time. At the same time, the components of the ink have to meet the requirements of lead-free composition. The usual types, capable of meeting the requirements mentioned above, comprise pigments as coloring material, frit as binder material and vehicle material. In an exemplary embodiment of the ink composition, the components are in the following ranges: 35-55% by weight of pigment, 1 5-30% by weight of lead-free frit, 20-45% by weight of material of vehicle, in which the three components constitute a total of 1 00% by weight. In a further embodiment, the components are in the following ranges: 42-52% by weight of pigment, 1 5-28% by weight of lead-free phyta, 25-40% by weight of vehicle material. Still in a further embodiment, the components are in the following ranges: 40-45% by weight of pigment, 1 7-25% by weight of lead-free frit, 29-38% by weight of carrier material. The binder material can be a glass enamel frit with low melting point. This coefficient of thermal expansion should be adjusted to the coefficient of thermal expansion of soft glass bulbs and should also be suitable for borosilicate glass bulbs. The upper value of the fire marking temperature range should be so far from the softening point of the glass material in the foci that the amount of heat that arises when marking the spotlights does not cause any deformation of the focus. The organic or inorganic vehicle material must not be poisonous either in a liquid or gaseous state, and must be adequate to prepare homogenous and lump-free paste. It should not cause any change in the consistency of finished pulp during the manufacture and storage of the pulp through either chemical reactions or evaporation. In addition, it should not damage the structural unit to which the paste is applied. In the case of rubber stamping, you should not damage the stamping mat material. Additionally, the vehicle material must evaporate and burn completely while marking the brand. If the base is water, then other additive materials need to be adequate for the aforementioned requirements. The vehicle material that meets the requirements listed above may be at least one member selected from the group of organic liquid, water, additive. The carrier material may preferably be a member selected from the following group: 100 wt.% Glycerin, 95 wt.% Glycerin and 5 wt.% Water, 90 wt.% Glycerin and 10 wt.% water, 85% by weight of glycerin and 15% by weight of water. The organic liquid can be at least one member selected from the following group: glycerin, castor oil, rapeseed oil, synthetic oil, mineral oil. The additive may be at least one member selected from the group of active surface material, flux, anti-foaming agent. The pigment may be selected from at least one member of the inorganic oxide and metal group, which becomes a colored compound upon heating. These metals are known to a person skilled in the art. The inorganic oxide can be at least one selected member of the following group: silver oxide, titanium dioxide, manganous oxide, iron oxide, copper oxide The pigment comprises the following components 50-90% by weight of silver oxide, 10-20% by weight of iron oxide , 1 0-20% by weight of titanium dioxide, or 75-85% by weight of silver oxide, 1-0-1 5% by weight of iron oxide, 1-0-1 5% by weight of titanium dioxide The components of the pigment constitute a total of 1 00% by weight in both cases. The preferably used frit is lead free., cadmium and chromium The coefficient of thermal expansion is 86-90 x 1 0-7 K 1, its temperature domain of burned to fire is 440-51 0 ° C The coefficient of thermal expansion coefficient is adjusted to the coefficients of expansion thermally soft glass bulbs perfectly and is also suitable for borosilicate glass The higher fire-marking temperature should be so far from the softening point of bulbs glass material that the amount of heat arising when spotting the bulbs does not cause some deformation of focus An ink composition suitable for marking light sources is made of the aforementioned materials within the following ranges of concentration 35-45% by weight of silver oxide, 1-5% by weight of free-flowing frit, 30- 40% by weight of glycemide, in which the components constitute a total of 1 00% by weight The experimental stamping ink pastes were produced in the laboratory as described below EX EMPLO 1 This example is a black marker ink paste The raw materials were - silver oxide powder precipitated, washed, sieved and dried, - lead-free glass glaze frit of type EG 2998, - glycemap Glaze frit Lead-free glass of type EG 2998 can be purchased from Ferro Corporation (Cleveland, Ohio, US) 140 grams of silver oxide, 60 grams of fried EG 2998, and a maximum of 1 00 cubic centimeters of glycemia were mixed in a bowl The amount of glycerin was changed according to the desired consistency of the ink paste. The mixing bowl was a so-called mortar with beater made of porcelain. The raw materials were mixed in the mixing bowl until it became a material. similar to pasta Mixing time required was approximately 10 minutes. Subsequent to the mixing operation, the resulting paste material was allowed to stand in the mixing bowl, while the bowl of material as paste was protected from light. We mixed the paste-like material about a day later and this operation was repeated for 5 consecutive days.

EX EMPLO 2 This example also refers to a black marker ink paste. We used a lead-free glass glaze frit of type EG 2934. This frit had a slightly higher silica content and is also available from Ferro Corporation, Cleveland, Ohio, US. Other raw materials and their amounts were identical as those of Example 1. The mixing procedure was also substantially identical.

EXAMPLE 3 This was a colored marker ink paste. The raw materials were - lead-free decoration color Sicocer A cobalt blue 558, which can be obtained from BASF AG, Germany; - lead-free glass glaze of type EG 2934; - glycerin na The mixing ratio was as follows: Sicocer A cobalt blue 558 70 grams, Frita EG 2934 45 grams, Glicepna 60 cubic centimeters maximum according to the desirable consistency The mixing time was approximately 20 m inutes, other operations in the procedure were substantially identical to those of Examples 1 and 2, respectively EX EMPLO 4 This was a black marker ink paste, however based on water The raw materials were - precipitated silver oxide powder, washed, sifted and dried, - lead-free glass enamel frit of type EG 2934, - liquid mixture including, - 91 5 wt .-% of dewormed water, - 8 wt% of ethylene oxide, type Polyox Resin WSRN 3000 made by Dow Chemical Company, (US), - 0 01% by weight of anti-foam additive, type ADDI D 880 made by Wacker Chemie GmbH, (Germany), - 0 4% by weight of active surface additive, type Haloflex 202-S Emulsion made by Avecia Neoresins (Thailand) 40 grams of silver oxide, 14 grams of EG 2934 frit and maximum 30 cubic meters of the liquid mixture identified above, were mixed in a mixing bowl The amount of the liquid mixture varied according to the desired consistency of the ink The mixing time was approximately 10 minutes. Additional steps of the procedure were substantially identical with the operations described in Examples 1, 2 and 3, respectively. Table 1 below shows a summary of stamping ink pastes produced experimentally from different compositions. The components are silver oxide that was precipitated, washed, dried and sieved; lead-free glass glaze of type EG 2998 and glycerin. Its quantity is expressed as a percentage by weight. EG 2998 frit was purchased from Ferro Corporation, (Clevaland, Ohio, US). Of course, this and the foregoing examples are for illustration only without imitating the scope of the invention.

Table 1

Claims

CLAIMING IS 1 An ink composition for marking glass and ceramic surfaces and for marking said surfaces at a high temperature with fire, the ink composition comprising the following components 35-55% by weight of pigment, 1 5-30% by weight of fried ibre lead, 20-45% by weight of vehicle material, and the components constitute a total of 1 00% by weight 2 The ink composition of claim 1, in which the fire-marking temperature is in the range of 440-51 0 ° C 3 The ink composition of claim 1, wherein the composition comprises the following components 42-52% by weight of pigment, 1-5-2% by weight of lead-free frit, 25-40% by weight of carrier material, and the components constitute a total of 1 00% by weight 4 The ink composition of claim 1, wherein the composition comprises the following components 40-45% by weight of pigment, 1 7-25% by weight of fried lead, 29-38% by weight of vehicle material, and the components constitute a total of 1 00% by weight. The ink composition of claim 1, wherein the The pigment is at least one member selected from the following inorganic oxide group, metal, which becomes a colored compound upon heating. The ink composition of claim 5, wherein the inorganic oxide is at least one member selected from the group. of silver oxide, titanium dioxide, magnesium oxide, iron oxide, copper oxide 7 The ink composition of claim 1, wherein the carrier material is at least one member selected from the group of organic liquid, Water, additive 8 The composition of claim 7, wherein the organic liquid is at least one member selected from the group of glycepine, castor oil, rapeseed oil, synthetic oil, mineral oil. ink of claim 7, wherein the additive is at least one member selected from the group of active surface material, flux, anti-foaming agent. The ink composition of claim 1, wherein the pigment comprises the following components: 50-90% by weight of silver oxide, 10-20% by weight of iron oxide, 10-20% by weight of titanium dioxide, and the components constitute a total of 100% by weight. The ink composition of claim 10, wherein the pigment comprises the following components: 75-85% by weight of silver oxide, 10-15% by weight of iron oxide, 10-15% by weight of titanium dioxide, and the components constitute a total of 100% by weight. 12. The ink composition of claim 1, wherein the carrier material is a member selected from the following group: 100 wt% glycerin, 95 wt% glycerin, and 5 wt% water, 90% by weight of glycerin and 10% by weight of water, 85% by weight of glycerin and 15% by weight of water. The ink composition of claim 1, wherein the composition comprises the following components: 35-45% by weight of silver oxide, 15-25% by weight of lead-free frit, 30-40% by weight of glycerin, and the components constitute a total of 1 00% by weight. 14. The ink composition of claim 1, wherein the composition is capable of marking at a high temperature provided by exposure of the glass surface and ceramic to flame. 5. The ink composition of claim 1, wherein the composition is a material of paste-like consistency.