USE OF A LACQUER SYSTEM FOR COATING A LENS, METHOD OF COATING AN EDGE OF A LENS, AND LENS

Abstract

Disclosed is the use of a lacquer system for producing a lacquer edge coating on an edge of a lens, wherein-the lacquer system comprises at least one first component and one second component and configured to be hardened by irradiation with light of a wavelength in the range from 0.7 m to 1.4 m; wherein the first component comprises at least one resin, at least one diluent, and at least one filler, with the content of the at least one resin in the first component amounting to 20 to 65 wt. % of the first component, with the content of the diluent amounting to 5 to 70 wt. % of the first component, and the content of filler amounting to 2 wt. % of the first component; and wherein the second component comprises at least one crosslinking agent.

Claims

1. Use of a lacquer system for producing a lacquer edge coating on an edge of a lens, wherein the lacquer system comprises: at least one first component and one second component and the first component and second component configured to be hardened by irradiation with light of a wavelength in the range from 0.7 to 1.4 m; wherein the first component comprises at least one resin component selected from the group comprising epoxy resin, acrylic resin, and mixtures thereof, at least one diluent in the form of an organic solvent, and at least one or more fillers; wherein the content of the at least one epoxy resin and/or at least one acrylic resin in the first component amounts to 20 to 65 wt. % relative to the total weight of the first component; the content of the diluent amounts to 5 to 70 wt. % relative to the total weight of the first component; and the content of filler amounts to 2 wt. % or more relative to the total weight of the first component; and wherein the second component comprises at least one crosslinking agent that is selected from the group comprising aliphatic isocyanates, aromatic isocyanates, compounds with amino groups, and mixtures thereof

2. Use in accordance with claim 1, wherein either the first and/or second component further comprises least one black filler.

3. Use in accordance with claim 1, wherein the first and/or second component comprises/comprise at least one white filler, in particular silica and/or barium sulfate.

4. Use in accordance with claim 1, wherein the first component comprises an epoxy resin as the resin component.

5. Use in accordance with claim 1, wherein no aromatic solvents are contained in the first component and the diluent in the first component comprises at least one ester.

6. Use in accordance with claim 1, wherein the first component comprises at least one polymer having acid groups.

7. Use in accordance with claim 1, wherein a dynamic viscosity of the lacquer system amounts to 300 to 3000 mPa.Math.s at 25 C.

8. A method of coating an edge of a lens, comprising applying a lacquer system to an edge of the lens to be coated, wherein the lacquer system is a lacquer system for use in accordance with claim 1; and hardening the lacquer system by irradiation with light at a wavelength in the range from 0.7 m to 1.4 m.

9. A method in accordance with claim 8, comprising irradiating the for a time period of less than 30 minutes.

10. A method in accordance with claim 8, wherein the applying a lacquer system is applying with a layer thickness of 1 to 50 m.

11. A method in accordance with claim 8, wherein a layer thickness measurement of the lacquer system takes place before said hardening.

12. A method in accordance with claim 8, wherein the irradiating is carried out by at least one NIR radiator that has light at a wavelength maximum in the range from 0.7 to 1.4 m.

13. A method in accordance with claim 8, further comprising cooling the lens, wherein the lens is cooled during the irradiation with light at a wavelength in the range from 0.7 to 1.4 m.

14. A method in accordance with claim 8, wherein the lens is rotated relative to a light source that emits light at a wavelength in the range from 0.7 m to 1.4 m.

15. A method in accordance with claim 8, wherein the irradiation is carried out in a pulsed manner.

16. A lens comprising: an edge lacquer coating available by a use of a lacquer system in accordance with claim 1.

17. Use in accordance with claim 2, wherein the at least one black filler is carbon black.

Description

[0036] The invention will be described in the following by way of example with reference to the enclosed Figures. There are shown, schematically in each case:

[0037] FIG. 1 a cross-section through a lens in accordance with the invention; and

[0038] FIG. 2 an apparatus for carrying out the method in accordance with the invention.

[0039] A lens 1 is schematically shown in FIG. 1 whose transparent body 10 has arched surfaces 12 that are bounded by a border or edge 14. A lacquer edge coating 16 is applied to the edge 14. The lacquer edge coating 16 is able to minimize scattered light at the edge of the lens 1.

[0040] An apparatus for carrying out the method in accordance with the invention for coating the edge 14 is shown schematically in FIG. 2. The apparatus shown in FIG. 2 first has a holder 20 for the lens 1 shown in FIG. 1. The holder 20 is rotatably supported about an axis D and is produced from metal, for example. An adapter 21 that has a surface that is arched to match a surface is provided on the holder 20. This adapter can, for example, be produced from a plastic such as PEEK. The apparatus furthermore has means to apply a lacquer system to produce the lacquer edge coating 16. These means are, however, not shown in FIG. 2. Furthermore, in the apparatus shown in FIG. 2, two NIR radiators 22 are provided that emit NIR radiation in the direction of the edge 14 of the lens 1 to harden the applied lacquer system while the lens is rotated about the axis D. The temperature of the lenses 1 during the irradiation by the NIR radiators 22 can be monitored via a pyrometer 24. The cooling apparatus 26 can, where necessary, cool the body 10 of the lens 1 in that compressed air is, for example, blown onto it.

[0041] The invention will be explained in more detail in the following with reference to examples that are, however, not to be understood as restrictive.

[0042] A lacquer system suitable for a use in accordance with the invention can comprise a composition such as is indicated in the following Table 1.

[0043] The components shown in Table 1 were mixed in the indicated amounts and subsequently applied to an edge of a lens composed of glass having a surface roughness R.sub.max of 1 to 3 m. Hardening took place by irradiation with NIR light at a wavelength maximum of 0.9 m and at an irradiation power of 450 kW/m.sup.2.

[0044] The resistance to solvents (ethanol, acetone/10 cycles with moistened cotton bud), UV radiation (96 h, 500 DIN ISO 9022-20-03-1), cold (16h, 40 C. DIN ISO 9022-10-08-1), heat (16 h, 70 C./6 h, 85 DIN ISO 9022-11-05-1), rapid temperature change (25 C./40 C. 5 cycles DIN ISO 9022-15-02-1), humid heat (21d 40 C. 95-98% rel. humidity DIN ISO 9022-12-04-1), artificial hand perspiration (7d DIN ISO 9022-86-02-1), cosmetic base substances (7d 9022-86-02-1), and a salt spray test (24h DIN ISO 9022-4 Art. 40) was examined after hardening and was satisfied by the lacquer systems of Examples 1 to 4.

[0045] In principle, all the lacquer systems indicated in the examples are suitable to manufacture a uniform lacquer border or edge coating. However, the resistance to solvents,

[0046] UV radiation, cold, heat, rapid temperature change, humid heat, artificial hand perspiration, cosmetic base substances, and a salt spray test are most advantageously pronounced for the lacquer system in accordance with Example 1.

[0047] An exemplary irradiation plan with which temperature sensitive glasses can be coated particularly well is shown in table form in the following.

TABLE-US-00001 Radiator on Radiator off Power 1 s 3 s 50% 1 s 3 s 70% 3 s 3 s 90% 3 s 3 s 90% 3 s 3 s 90%

[0048] In the above representation of the irradiation plan, a power of 100% corresponds to an irradiation power of 450 kW/m.sup.2 (maximum power of the NIR radiator). An irradiation at 50% of the maximum power of the NIR radiator is first carried out for 1 second before the irradiation is paused for 3 seconds. Irradiation is subsequently carried out at 70% of the maximum power of the NIR radiator for 1 second before the irradiation is again paused for 3 seconds. An irradiation at 90% of the maximum power of the NIR radiator is then carried out for 3 seconds, with the irradiation being paused for 3 seconds after every irradiation step.

TABLE-US-00002 TABLE 1 Component Example 1 Example 2 Example 3 Example 4 First component, 25-36% epoxy resin *1 20-40% MMA resin *6 45-50% acrylic resin *10 17-36% epoxy resin *1 Amounts in wt. % 1-20% propyl methyl 15-35% vinyl acetate *7 10-25% propylene glycol 1-20% propyl methyl acetate diacetate acetate 10-30% ethoxy propyl 15-25% xylol 5-15% barium sulfate *2 10-30% butyl glycol acetate acetate 5-15% barium sulfate *2 10-20% methyl isobutyl 5-10% black carbon *3 5-15% barium sulfate *2 ketone 5-10% black carbon *3 5% *8 plasticizer 1-5% silica *11 5-10% black carbon *3 3-6% silica *4 2-5% black carbon *3 2.5% (3-glycidyloxypropyl) 3-6% silica *4 trimethoxy silane 2% dispersing agent *5 1.5% dispersing agent *5 1.5% dispersing agent *5 2% dispersing agent *5 1-2% superplasticizer *9 1-2% superplasticizer *9 0.05% dibutyltin laurate 0.05% dibutyltin laurate Second component Aliphatic isocyanate *12 Aromatic isocyanate *14 Aliphatic isocyanate *12 Aminic hardener *13 or aminic hardener *13 First component: 100:10 100:20 100:10 100:20 Second component *1 to *14 are explained in more detail in the following Explanation for *1 to *14 in Table 1: *1 Bisphenol A based epoxy resin Araldit GT 7004, available from Jubail Chemical Industries Company *2 Blanc Fixe N, available from Solvay S.A. *3 Color black fw 200, available from Orion Engineered Carbons *4 Aerosil 200, available from Evonik *5 Disperbyk 180, available from BYK-CHEMIE GMBH *6 Degalan 560, available from Evonik *7 Vinnapas 5010 N, available from Wacker Chemie AG *8 1,2-cyclohexane dicarboxylic acid diisononyl ester *9 Polyether modified polysiloxane, Borchi Gol OL 17, available from Borchers GmbH *10 Setalux 1122, available from Allnex Netherlands B.V. *11 Aerosil R972, available from Evonik *12 Desmodur N75, available from Covestro *13 Versamin M1, available from Gabriel Performance Products, LLC *14 Desmodur E17, available from Covestro

REFERENCE NUMERALS

[0049] 1 lens

[0050] 2 body

[0051] 12 arched surface

[0052] 14 edge

[0053] 16 lacquer edge coating

[0054] 20 holder

[0055] 21 adapter

[0056] 22 NIR radiator

[0057] 24 pyrometer

[0058] 26 cooling apparatus

[0059] D axis