DE102012102818B3 - Sign color, useful for applying marking points on glasses such as optical glasses, comprises a coloring substance, a water-soluble polymer comprising polyethylene glycol, water, and a viscous and hygroscopic substance including glycerol - Google Patents

Abstract

Sign color comprises (a) 10-50 wt.% of a coloring substance, (b) 5-10 wt.% of a water-soluble polymer comprising polyethylene glycol, (c) 0.1-5 wt.% of water, and (d) 100 wt.% of a viscous and hygroscopic substance including glycerol. An independent claim is included for producing a sign color, which is adapted for the application of marking points on glasses, comprising (a) concentrating 10-50 wt.% of pigment with 5-10 wt.% of concentrated water soluble polymer, (b) adding 0.1-5 wt.% of water and 100 wt.% of viscous and hygroscopic substance to the concentrated mixture, and (c) mixing the added component under ambient conditions to form a homogeneous suspension.

Description

Field of the invention

The invention relates to an indication color for applying marking points to glasses, in particular optical glasses, to a method for producing an indication color according to the invention, and to the use of an indication color according to the invention for applying marking points to glasses, in particular optical glasses.

Prior art and background of the invention

In the production of optical aids, such as spectacles, the spectacle lenses to be inserted into a spectacle frame must be adapted to the shape of the spectacle frame, which can be done for example by grinding the spectacle lenses. In order to ensure a correct manufacture of a spectacle lens, marking points are applied to the unprocessed spectacle lens, which serve as reference points during the processing of the spectacle lens. For the application of the marking points, vertex-value measuring devices with point systems are used.

A vertex measuring device comprises an indicator device comprising marking pins, an operating lever and a color cartridge or a color pad. By operating the operating lever, the marking pins are first inserted with the tips of the color cartridge or in the ink pad to record the color of the indicator. By another actuation of the operating lever, the indicator pins resiliently touch the lens to be marked and leave marks on the surface of the lens. Thus, the optical center, the main intersecting positions, the base position and the horizontal reference line can be marked on the spectacle lens.

After application of the marking points, the spectacle lens can be further processed and after completion of further processing, the marking points can be removed again from the spectacle lens.

The disadvantage here, however, is that the marker color or the indicator color has solvent-containing components and after application to the spectacle lens dries or hardens relatively quickly, so that the indicator color after further processing of the lens is difficult to remove again. Another drawback of the prior-art indicia paint is that the solvent-containing and oily paint with its creep properties will eventually contaminate or damage the inkpad, dot mechanism, and body parts of the lensmeter. The impurities can usually only be removed by using solvents.

Modern eyeglass lenses have different high-quality surfaces, which in particular are intended to prevent dirt or liquid from adhering to them. The indicia dyes known in the art are unsuitable for use on such surfaces because only very little color of the indicia color present at the tip of the marker sticks to the surface of the lens. This has the consequence that the spotting is barely visible. Further, the solvents of the art-known indicia dyes can undesirably alter the glass surfaces.

Another disadvantage of the oily and solvent-containing inks in the inkpad is that the sponge of the inkpad may degrade due to the solvents contained in the ink. Further, frequent dipping of the marker pens into the ink pad will cause the tips of the marker pens to damage the ink pad over time, resulting in reduced ink pickup.

From the DE 100 19 422 A1 For example, a composition for a paint based on sols, water of non-volatile solvents and water-soluble polymers is known, which water-soluble polymers may include glycerine and polyethylene glycols.

From the DE 27 22 540 For example, nontoxic, water-removable stamping inks containing 60-75% by weight of glycerine dyes and water are known. In addition to glycerol, polypropylene glycol can also be added.

From the DE 10 2005 019 743 A1 For example, the use of inks for labeling glass is known which, in addition to 0.01-40% by weight of dyes, may contain 0.02-99.98% by weight of water and 0.01-40% by weight of a solvent mixture. The solvent mixture may contain glycerol and polyethylene glycols.

Object of the invention

The object of the present invention is therefore to provide an indication color, in particular for applying marking points on glasses, in particular optical glasses, which can easily be removed after application to the glass even after a long time and does not dries on the glass, which in a color pad does not dry even after a long time, with which ensures that surfaces of the glasses are not damaged and with which it can be ensured that when applying the color of the indicator on the glass surface with a marker pen a sufficiently large amount of the glass surface adheres without drowning.

Inventive solution

This object is achieved by an indication color for applying marking points on glasses, especially optical glasses, by a method for producing an indicator color according to the invention, as well as by the use of the inventive marker color for applying marking dots on glasses, in particular optical glasses according to the independent claims. Advantageous embodiments and further developments of the invention are specified in the respective dependent claims.

• a) 10 bis 50 Gew.-% einer farbgebenden Substanz,
• b) 5 bis 10 Gew.-% eines wasserlöslichen Polymers, wobei das wasserlösliche Polymer Polyethylenglycol umfasst,
• c) 0,1 bis 5 Gew.-%, vorzugsweise 0,1 bis 2 Gew.-% Wasser, und
• d) auf 100 Gew.-% ergänzte Anteile einer viskosen und hygroskopischen Substanz, wobei die viskose und hygroskopische Substanz Glycerin umfasst,

aufweist, jeweils bezogen auf die Gesamtzusammensetzung der Anzeichenfarbe.Accordingly, an indication color is provided, in particular for the application of marking points on glasses, in particular optical glasses, wherein the indication color

• a) 10 to 50% by weight of a coloring substance,
• b) 5 to 10% by weight of a water-soluble polymer, the water-soluble polymer comprising polyethylene glycol,
• c) 0.1 to 5 wt .-%, preferably 0.1 to 2 wt .-% water, and
• d) proportions of a viscous and hygroscopic substance added to 100% by weight, the viscous and hygroscopic substance comprising glycerol,

, in each case based on the total composition of the indicator color.

The coloring substance may include pigments, in particular zinc sulfide.

Polyethylene glycol having an average molecular weight between 200 and 600, preferably 400, has proven to be suitable.

The indicator dye may additionally comprise 0.1 to 10% by weight, preferably 0.1 to 2% by weight of cellulose.

• a) 10 bis 50 Gew.-% einer farbgebenden Substanz,
• b) 5 bis 10 Gew.-% eines wasserlöslichen Polymers, wobei das wasserlösliche Polymer Polyethylenglycol umfasst,
• c) 0,1 bis 5 Gew.-%, vorzugsweise 0,1 bis 2 Gew.-% Wasser, und
• d) auf 100 Gew.-% ergänzte Anteile einer viskosen und hygroskopischen Substanz, wobei die viskose und hygroskopische Substanz Glycerin umfasst,

jeweils bezogen auf die Gesamtzusammensetzung der Anzeichenfarbe.The invention also provides the use of an indicia dye for applying marking dots to glasses, in particular optical glasses, wherein the indicia color includes:

• a) 10 to 50% by weight of a coloring substance,
• b) 5 to 10% by weight of a water-soluble polymer, the water-soluble polymer comprising polyethylene glycol,
• c) 0.1 to 5 wt .-%, preferably 0.1 to 2 wt .-% water, and
• d) proportions of a viscous and hygroscopic substance added to 100% by weight, the viscous and hygroscopic substance comprising glycerol,

in each case based on the total composition of the indicator color.

The coloring substance may include pigments, in particular zinc sulfide.

The polyethylene glycol preferably has an average molecular weight of between 200 and 600, more preferably of 400.

• a) 10 bis 50 Gew.-% eines Pigments, vorzugsweise Zinksulfid, mit 5 bis 10 Gew.-% eines wasserlöslichen Polymers eingedickt werden, wobei das wasserlösliche Polymer Polyethylenglycol umfasst,
• b) sodann 0,1 bis 5 Gew.-%, vorzugsweise 0,1 bis 2 Gew.-% Wasser und ein auf 100 Gew.-% ergänzender Anteil einer viskosen und hygroskopischen Substanz zugegeben werden, wobei die viskose und hygroskopische Substanz Glycerin umfasst, und
• c) unter Raumbedingungen zu einer homogenen Suspension vermischt werden.

The invention also provides a method for producing an indication color, which is particularly adapted for applying marking points to glasses, in particular optical glasses, wherein

• a) from 10 to 50% by weight of a pigment, preferably zinc sulfide, is thickened with from 5 to 10% by weight of a water-soluble polymer, the water-soluble polymer comprising polyethylene glycol,
• b) then 0.1 to 5 wt .-%, preferably 0.1 to 2 wt .-% of water and a 100 wt .-% additional portion of a viscous and hygroscopic substance are added, wherein the viscous and hygroscopic substance comprises glycerol , and
• c) are mixed under ambient conditions to a homogeneous suspension.

To adjust the viscosity of the indicator dye, it is additionally possible to add from 0.1 to 10% by weight, preferably from 0.1 to 2% by weight, of cellulose.

Pigments are understood to be all organic or inorganic solids customarily used for coloring. The pigments are in the application medium, i. H. in the indication color preferably insoluble. The pigments can be white, black or colored. However, white pigments have proven to be particularly advantageous. Zinc sulfide has been found to be a beneficial white pigment. Of course, other white pigments or colored pigments can be used.

Brief description of the figures

Further details and features of the invention and specific embodiments of the invention will become apparent from the following description taken in conjunction with the drawings. It shows:

1 an optical glass on the surface of which three marking dots are applied with an indication color according to the invention;

2a a color pad, preferably for receiving or storing an indication color according to the invention;

2 B this in 2a shown color pads with a marker pin in the recording of color indicator from the ink pad;

3 a color pad in a housing having a number of openings;

4 three ink pads, each disposed in a housing to adjust the position of the individual ink pads relative to the marking pins, each housing having a fastener;

5 an alternative embodiment of a color pad in a housing;

6 a color pad in an alternatively configured housing; and

7 an arrangement of three ink pads on a mounting plate.

Detailed description of the invention

The indicia of the invention comprises 10 to 50% by weight of a colorant, 5 to 10% by weight of a water-soluble polymer, the water-soluble polymer comprising polyethylene glycol, 0.1 to 5% by weight, preferably 0.1 to 2% by weight of water and to 100% by weight of additional constituents of a viscous and hygroscopic substance, the viscous and hygroscopic substance comprising glycerol, in each case based on the total composition of the marker color.

A particularly advantageous pigment has been the white pigment Sachtolith HDS from Sachtleben Chemie GmbH, which has a low abrasiveness due to its low Mohs hardness and very good dispersibility. Sachtolith HDS is a white pigment based on zinc sulphide.

When selecting the pigments, care should be taken according to the invention to the hardness of the pigments. It is advantageous to select those pigments whose Mohs hardness is low, preferably less than 6, particularly preferably less than or equal to 3. Sachtolith HDS has a Mohs hardness of 3. The use of pigments with low hardness avoids that the surface of the glasses or optical glasses is affected by the pigments, for example, is scratched.

As the water-soluble polymer, polyethylene glycol (PEG) is used. The polyethylene glycol is essentially intended to adjust the viscosity of the indicator dye. This makes it possible to adjust the viscosity of the indicator color for different glasses or glass surfaces in order to apply optimal marking points on different glass surfaces. Further, polyethylene glycol is hygroscopic, i. That is, polyethylene glycol has the property of binding moisture from the environment, which counteracts the drying out of the color of the indication. Polyethylene glycols having an average molecular weight of between 200 and 600, preferably having an average molecular weight of about 400, have proven to be advantageous. Such a low molecular weight is preferable in the present invention because the polyethylene glycols are present as nonvolatile liquids at room temperature at these molecular weights. Furthermore, the hygroscopicity, i. H. the ability to absorb water decreases with increasing molecular weight. Polyethylene glycol 400 (polyethylene glycol having a molecular weight of 400) has proven particularly suitable.

Furthermore, the indicator dye comprises 0.1 to 5% by weight of water and 100% by weight of added constituents of a viscous and hygroscopic substance. In the present case, glycerol (also called glycerol or propanetriol) is used as the viscous and hygroscopic substance. According to the invention, glycerin has the advantage that it is water-soluble and readily miscible with the water. Another advantage of glycerol according to the invention is that it is a viscous and hygroscopic liquid at room temperature, so that it effectively counteracts drying out of the indicator dye due to its hydrophilic properties and positively supports the production of optimum marking points on the glass surface due to its viscosity. Furthermore, it has been found that glycerol as a dispersant ensures optimal mixing of pigments, polyethylene glycol and water.

Depending on the specific application, preservatives may be added to the color of the sign. For further adjusting the viscosity of the indicator dye, the indicator dye may additionally be added with 0.1 to 10% by weight, preferably 0.1 to 2% by weight, of cellulose based on the total composition of the color of the indication. The addition of cellulose may be required if the viscosity of the polyethylene glycol and / or glycerol is insufficient to produce an optimum marking point on the surface of the glass, which may be the case, for example, where marking dots are applied at very high temperatures Need to become.

For the electronic registration of the applied marking points no coloring of the indication color is necessary. The electronic detection of the marking points can be done with a UV light in the transmitted light method and a UV camera. For electronic detection, the lensing effect of the marker points is sufficient. In addition, it has been found that the indicator dye according to the invention is particularly well suited for the electronic detection of marker points, because due to the inventive composition of the indicator color and the associated adhesion properties of the indicator color on the glass surface, a substantially round lenticular hemisphere can be produced, which is a for An electronic detection ensures optimal refraction. In the case of the indication colors known from the prior art, the generation of essentially round lenticular hemispheres on the glass surface can not be ensured, which leads to erroneous measured values, in particular in the case of the electronic detection of the marking points.

To prepare the indicator dye according to the invention, initially from 10 to 50% by weight of a pigment, preferably zinc sulfide, is added with the addition of from 5 to 10% by weight of a water-soluble polymer, the water-soluble polymer comprising polyethylene glycol. Subsequently, 0.1 to 5 wt .-%, preferably 0.1 to 2 wt .-% water and a 100 wt .-% complementary portion of a viscous and hygroscopic substance, wherein the viscous and hygroscopic substance comprises glycerol added, and mixed with the pigment-polyethylene glycol mixture. Under room conditions, the mixture thus produced is stirred, for example with a stirrer or a dissolver, until a homogeneous suspension is formed.

1 shows a section of an optical glass L, such as a spectacle lens, on the curved surface with a marker color according to the invention three marking points P are applied.

How out 1 As can be seen, the three marking points P form a substantially round lenticular hemisphere due to the composition of the sign color according to the invention and the associated adhesion properties. Due to the inventive composition of the color indicator, the formation of a round lenticular hemisphere is also ensured on such surfaces, which should just prevent dirt or liquid from adhering to the surface. The indication color according to the invention is thus also suitable for applying marking points to glasses which have a nano-coated surface. Due to the hygroscopic properties of the sign color according to the invention it is ensured that the marking points P do not dry on the surface of the glass L even after a long time, so that the marking points P can be easily wiped off the surface if necessary.

2a shows a color pad K, in particular for use in a lensmeter for applying marking points on glasses, in particular optical glasses. The ink pad K serves as a depot for storing the sign color of the present invention, which can be dispensed to a pen to apply a marker point to a surface of a glass with the pen.

The ink pad K has a surface configured and open-pored foam rubber S with a top O and a bottom U on. Furthermore, the ink pad K has a fabric G, which is arranged on the upper side O of the foam rubber S.

The fabric G may comprise organza, preferably made of synthetic fibers. Alternatively, the fabric G may comprise a gauze or gauze. Preferably, a tissue is selected which is particularly durable, permeable to water and preferably not pierced or pierced by the tip of the pin. The fabric G can be at least selectively insoluble, for example by means of an adhesive, be connected to the foam rubber S. When using a housing in which the ink pad K is arranged, can be dispensed with the connection of the fabric G with the foam S, such as from 3 to 5 seen. In particular, the fabric G is designed such that the fabric G prevents penetration of the pins into the foam rubber S.

The foam rubber S used is an open-pore foam rubber in which the pore size of the pores of the foam rubber decreases from the lower side U to the upper side O of the foam rubber S. The large pores on the bottom U of the foam ensure that large amounts of the color of the sign according to the invention can be absorbed and stored in the foam rubber S, while the small pores on the foam Top O of the foam S improve the color output to the pen. The extra small pores on the top O prevent the indicator color from quickly flowing back into the foam S, ensuring optimum ink absorption by the pen. Particularly advantageous is a latex foam rubber, preferably made of synthetic latex has been found. As a foam rubber, for example, Comprex bindings cut to size can be used by Lohmann & Rauscher GmbH & Co. KG. Preferably, the foam rubber S has a thickness d of about 3 mm to 10 mm, preferably about 5 mm.

The above-described fabric G is applied to the surface of the foam rubber S where the foam rubber S has the small pores.

2 B shows a color pad in which a pen is in a position relative to the ink pad, in which the pen with its tip receives an indication color.

How out 2 As can be seen, the tip of the pin presses both the fabric G and the foam rubber S down, so that in the region of the tip of the pin results in a dent in the ink pad. The fabric G is designed so that the tip of the pin does not penetrate the tissue. This can ultimately form the bulge, in which a small "color lake" of color indicator can form, which is at least partially absorbed by the tip of the pen or at least partially adhering to the tip of the pen.

Without the fabric G, the tip of the pin would work into the foam rubber S or penetrate the foam rubber S, without forming a bulge in the foam rubber S, as is the case with the ink pad described here.

By pressing the pin onto the ink pad, whereby the indentation forms, the foam rubber S dispenses, via the small pores, a small amount of the color of the indicator, which forms the color lake FS. Because of the small pores on the top O of the foam S, the emitted indicator color only very slowly back into the foam S, the color lake FS is maintained for a certain time, so that the tip of the pen can absorb an optimal amount of color indicator.

When the pencil is lifted off the ink pad, it picks up an optimal amount of color from FS, forming a small ball of paint on the tip of the pencil. This amount is sufficient to apply a clearly visible marking point P on a surface of a glass to be marked.

As a pin, for example, a pin can be used with a metal tip. Of course, also pins with a tip, such as a plastic, possible. The lower end of the tip may be rounded as in the enlarged view of the pen tip in FIG 2a shown. The rounding has a radius between 0.2 mm and 1 mm, preferably between 0.5 mm and 0.75 mm.

3 shows a color pad K, which is arranged in a housing H.

The housing H has on the side facing the tissue G side three openings through which the pins of a display device of a lensmeter can get to the color pad for recording indication color. Depending on the specific application, the housing H may also have less than three or more than three openings. Through the housing upper side, which forms a cover of the housing H, the fabric G is pressed substantially against the foam rubber S, so that the fabric G does not have to be connected to the foam rubber S. This has the advantage that the fabric G can be replaced or replaced independently of the foam rubber S. The housing H may be a plastic or a metal housing. Furthermore, a cover can be provided, with which the openings of the housing H can be closed or covered when not in use of the ink pad.

4 shows an alternative application example of a color pad.

Here, a color pad is provided for each pin of an indicator device of a lensmeter. Each of the three ink pads is housed in a housing H, respectively. Each of the housings has an opening at the top or side of the housing facing the fabric G, through which the pin can reach the foam rubber S to receive a corresponding amount of color of the sign.

The pins can have a different length. For example, in the in 4 shown example, the middle pin on a shorter length than the two outer pins. This makes it possible to adjust the length of the pins so that all the tips of the pins impinge simultaneously on a curved glass.

However, this has the consequence that when using a color pad, as with respect to 3 described that the two outer pins would penetrate deeper into the ink pad than the middle pin, which in turn means that the tip of the center pin can absorb much less color than the tips of the two outer pins. To solve this problem, it is therefore proposed to provide a separate ink pad for each pin, which are each housed in a separate housing H. As a result, a number of color pads, each having a different thickness or height, can be used in an indicator device of a vertex-value meter. Depending on the length of the pin, corresponding color pads can be used in the lensmeter.

In order to enable a simple replacement of the ink pad or the housing H with arranged therein ink pad, it is provided to arrange on the housing H fastener M, with which the ink pad or the housing attached to an indicator device of a lensmeter and dissolved when needed again can. In a particular embodiment, magnets, preferably permanent magnets, are used as fastening means. At the in 4 As shown, the magnets M are disposed on the outer surface of the housing bottom.

Instead of different heights or thicker ink pads, equally high ink pads can be used, whereby the adaptation of the height or the distance to the tips of the pins can be accomplished by using magnets of different thicknesses. This is particularly advantageous in the mass production of ink pads, since the ink pads must be made in one size and only different thickness magnets must be provided.

5 shows an alternative embodiment of a color pad, which is arranged in a housing H.

In this embodiment, the magnet M is disposed within the housing and at the bottom of the housing. Between the foam rubber S and the magnet M and / or between the magnet M and the bottom of the housing H, a further protective plate or protective layer, not shown here, can be arranged.

The housing H may have a lid in which the opening for the marking pen is located. The lid can be removable. The removable lid has the advantage that the fabric G and / or the foam rubber S can be easily replaced or replaced if necessary.

6 shows a further alternative embodiment of a color pad, which is arranged in a housing.

In contrast to the color pads shown above, the housing yields 6 no lid or cover. At the bottom of the housing, a magnet is arranged. On the magnet, the foam rubber S is arranged, which extends to the upper edge of the housing. The housing is covered with a fabric, with the fabric adhered to the upper edges of the housing.

7 shows an arrangement of three ink pads, which are each arranged in a cylindrical housing having an opening at the top. The middle housing has a greater height than the two outer housing. The housings are arranged on a metal plate MP. In each case a magnet is arranged in the housings, so that the housings remain relatively stable on the metal plate MP.

On the underside of the metal plate, a self-adhesive film KF is attached, with which the metal plate can be attached to a variety of indicator devices different crest lens measuring devices. Thus, the ink pads or housings with the ink pads disposed therein can be used in any vertex-refractive-indexing devices.

For filling the ink pads, the housing or the ink pads can be removed individually from the metal plate MP. After filling, they can easily be re-applied to the metal plate MP and stably remain on the plate due to the magnetic action between the metal plate MP and the magnet disposed in the housing. This also has the advantage that, when the housing is repositioned on the metal plate MP, the position of the housing relative to the metal plate may be different from the position of the housing relative to the metal plate prior to removal, resulting in that the indication pin after the re-fitting the housing on the metal plate wears another point of the fabric or the foam, which significantly increases the life of a color pad.

LIST OF REFERENCE NUMBERS

A

section axis

d

Thickness of the foam

FS

"Farbsee"

G

tissue

H

casing

K

ink pad

KF

double-sided adhesive film

L

Glass or optical glass (eg lens)

M

Fastening means, for. B. magnet

MP

metal plate

P

markers

O

Top of the foam

S

foam rubber

T

pin carrier

U

Bottom of the foam

Claims (10)

Indicator color for applying marking dots (P) to glasses (L), the indicator color a) 10 to 50% by weight of a coloring substance, b) 5 to 10% by weight of a water-soluble polymer, the water-soluble polymer comprising polyethylene glycol, c) 0.1 to 5 wt .-% water, and d) proportions of a viscous and hygroscopic substance added to 100% by weight, the viscous and hygroscopic substance comprising glycerol, , in each case based on the total composition of the indicator color. An indication color according to claim 1, wherein the coloring substance comprises pigments, in particular zinc sulfide. An indicator dye according to any one of the preceding claims, wherein the polyethylene glycol has an average molecular weight between 200 and 600, preferably 400. An indicator dye according to any one of the preceding claims wherein the indicia color additionally comprises from 0.1% to 10%, preferably from 0.1% to 2%, by weight of cellulose. Use of an indication color containing a) 10 to 50% by weight of a coloring substance, b) 5 to 10% by weight of a water-soluble polymer, the water-soluble polymer comprising polyethylene glycol, c) 0.1 to 5 wt .-% water, and d) proportions of a viscous and hygroscopic substance added to 100% by weight, the viscous and hygroscopic substance comprising glycerol, in each case based on the total composition of the indicator color, for applying marker points (P) to glasses (L). Use according to claim 5, wherein the coloring substance comprises pigments, in particular zinc sulfide Use according to one of claims 5 or 6, wherein the polyethylene glycol preferably has an average molecular weight of between 200 and 600, more preferably of 400. Process for the preparation of an indication color, which is adapted for applying marking points (P) to glasses (L), wherein a) from 10 to 50% by weight of a pigment is mixed with from 5 to 10% by weight of a water-soluble polymer, the water-soluble polymer comprising polyethylene glycol, b) then 0.1 to 5 wt .-% water and a 100 wt .-% additional portion of a viscous and hygroscopic substance are added, wherein the viscous and hygroscopic substance comprises glycerol, and c) are mixed under ambient conditions to a homogeneous suspension. A method according to claim 8, wherein additionally 0.1 to 10% by weight, preferably 0.1 to 2% by weight of cellulose is added for adjusting the viscosity of the indicator dye. A method according to any one of claims 8 or 9, wherein the pigment comprises zinc sulfide.

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