COATED SUBSTRATE AND PROCESS OF PREPARATION

Abstract

A coated glass substrate comprising: a transparent glass substrate coated with a blocking layer comprising a material having Si—O—Si bonds, a polyol and/or diol and a blocking component, wherein the blocking component is a material that is capable of blocking electromagnetic radiation in the wavelength range 10-500 nm.

Claims

1.-18. (canceled)

19. A coated glass substrate comprising: a transparent glass substrate coated with a blocking layer comprising a material having Si—O—Si bonds, a polyol and/or diol and a blocking component, wherein the blocking component is a material that is capable of blocking electromagnetic radiation in the wavelength range 10-500 nm.

20. The coated glass substrate according to claim 19, wherein the transparent glass substrate is a glass container and wherein the blocking layer is located on the external surface of the container.

21. The coated glass substrate according to claim 19, wherein the material having Si—O—Si bonds comprises a material having a crosslinked network of Si—O—Si bonds, preferably wherein the material having Si—O—Si bonds further comprises one or more organic functional groups.

22. The coated glass substrate according to claim 19, wherein the blocking component is a material that is capable of blocking electromagnetic radiation in the wavelength range 200-500 nm, preferably 250-500 nm, more preferably 300-500 nm, even more preferably 350-500 nm, most preferably 380-500 nm.

23. The coated glass substrate according to claim 19, wherein the blocking component comprises one or more of a benzotriazole compound, a benzophenone compound, a hydroxyphenyltriazine compound, and a cyanoacrylate compound.

24. The coated glass substrate according to claim 19, wherein the coated glass substrate comprises: a transparent glass substrate coated with a blocking layer comprising a material having Si—O—Si bonds, a polyol and/or diol and a blocking component, wherein the blocking component is a material that is capable of blocking electromagnetic radiation in the wavelength range 10-500 nm, wherein the transparent glass substrate is a glass container, wherein the blocking layer coats at least 80% of the external surface of the container, wherein the material having Si—O—Si bonds comprises a material having a crosslinked network of Si—O—Si bonds, and wherein the blocking component is a material that is capable of blocking electromagnetic radiation in the wavelength range 350-500 nm.

25. A process for preparing a coated glass substrate in accordance with claim 19, said process comprising the following steps: a) preparing a solution or mixture by mixing at least the following components: a silane, a polyol and/or diol, a blocking component, water and an acid; b) applying said solution or mixture to a surface of a transparent glass substrate; and c) curing the applied solution or mixture.

26. The process according to claim 25, wherein, in step a) following the mixing the solution or mixture is aged for at least 2 hr, more preferably at least 7 hr, even more preferably at least 10 hr, most preferably at least 12 hr.

27. The process according to claim 25, wherein, in step b), when the solution or mixture is applied to the surface of the transparent glass substrate, said transparent glass substrate is at a temperature of greater than 60° C., preferably greater than 80° C., more preferably greater than 100° C., most preferably greater than 110° C., but preferably less than 200° C., more preferably less than 160° C., even more preferably less than 140° C., most preferably less than 130° C.

28. The process according to claim 25, wherein, in step c), the applied solution or mixture is cured for at least 20 min, preferably at least 40 min, more preferably at least 50 min, most preferably at least 55 min, but preferably at most 24 hr, more preferably at most 10 hr, even more preferably at most 3 hr, most preferably at most 1.5 hr.

29. The process according to claim 25, wherein, in step c), the applied solution or mixture is cured at a temperature of greater than 20° C., preferably greater than 100° C., more preferably greater than 160° C., most preferably greater than 190° C., but preferably less than 400° C., more preferably less than 300° C., even more preferably less than 240° C., most preferably less than 210° C.

30. The process according to claim 25, wherein the silane is represented by the formula (1):
SiX.sub.4  (1) wherein X is a hydrolysable functional group or a halogen atom.

31. The process according to claim 25, wherein the silane is a tetraalkoxysilane such as tetraethoxysilane (TEOS).

32. The process according to claim 25, wherein the components mixed in step a) further comprise a silane coupling agent represented by the formula (2):
R.sup.1.sub.mR.sup.2.sub.nSiX.sub.4-m-n  (2) wherein R.sup.1 is an organic group having a reactive functional group, R.sup.2 is an organic group having no reactive functional group, X is a hydrolysable functional group or a halogen atom, m is an integer of 1 to 3, n is an integer of 0 to 2, and m+n is an integer of 1 to 3.

33. The process according to claim 32, wherein the silane coupling agent comprises one or more of vinyltriethoxysilane, p-styryltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane (GPTMS), 3-glycidoxypropylmethyldiethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, tris-(trimethoxysilylpropyl)isocyanurate, 3-ureidopropyltrimethoxysilane, 3-mercaptopropyltrimethoxysi lane and derivatives.

34. The process according to claim 25, wherein the solution or mixture prepared in step a) has a molar percentage (mol %) of the polyol and/or diol of at least 2 mol %, preferably at least 4 mol %, more preferably at least 5 mol %, most preferably at least 6 mol %, but preferably at most 20 mol %, more preferably at most 15 mol %, even more preferably at most 10 mol %, most preferably at most 7 mol %.

35. The process according to claim 25, wherein in step a) following the mixing the solution or mixture is aged for at least 2 hr; wherein in step b), when the solution or mixture is applied to the surface of the transparent glass substrate, said transparent glass substrate is at a temperature of greater than 60° C.; wherein the silane is a tetraalkoxysilane; wherein the components mixed in step a) further comprise a silane coupling agent represented by the formula (2):
R.sup.1.sub.mR.sup.2.sub.nSiX.sub.4-m-n  (2) wherein R.sup.1 is an organic group having a reactive functional group, R.sup.2 is an organic group having no reactive functional group, X is a hydrolysable functional group or a halogen atom, m is an integer of 1 to 3, n is an integer of 0 to 2, and m+n is an integer of 1 to 3; wherein the blocking component comprises one or more of a benzotriazole compound, a benzophenone compound, a hydroxyphenyltriazine compound, and a cyanoacrylate compound; and wherein the solution or mixture prepared in step a) has a molar percentage (mol %) of the polyol and/or diol, preferably glycerol, of at least 4 mol %, preferably at least 6 mol %.

36. A method utilizing of a polyol and/or diol to improve the durability to humidity of a coated glass substrate comprising a transparent glass substrate coated with a blocking layer comprising a material having Si—O—Si bonds and a blocking component, wherein the blocking component is a material that is capable of blocking electromagnetic radiation in the wavelength range 10-500 nm.

Description

[0099] The invention will now be further described by way of the following specific embodiments, which are given by way of illustration and not of limitation, with reference to the accompanying drawings in which:

[0100] FIG. 1 is a graph of percentage transmission vs wavelength for an uncoated colourless bottle (light grey curve), a coated bottle outside the scope of the present invention (dark grey curve) and a coated bottle according to the present invention (asterisked curve).

EXAMPLES

[0101] Uvinul™ 3050 was obtained from Sigma-Aldrich™. BYK™-345 was obtained from BYK™. The GPTMS was obtained from Sigma-Aldrich. The TEOS was obtained from Sigma-Aldrich.

Comparative Example 1

[0102] A solution/mixture was prepared by stirring the components shown below in Table 1 for 35 min.

TABLE-US-00001 TABLE 1 showing the mass of each component used for the solution prepared in Comparative Example 1 Uvinul ™ BYK ™ -345 Conc. HNO.sub.3 3050 Ethanol (5% Ethanol) GPTMS TEOS (5% Ethanol) Water (g) (g) (g) (g) (g) (g) (g) 2.5 28.9 0.8 11.3 22.6 0.5 33.4

[0103] Following stirring, the solution/mixture was aged by allowing it to stand for 12 hr at 5° C. A clear (flint) bottle at a temperature of 20° C. was then spray coated with the solution/mixture. The spray coating was carried out using two nozzles, PTFE tubing and syringe drivers. The applied solution/mixture was then cured at 200° C. for 1 hr.

[0104] The light transmission characteristics of the resultant coated bottle were tested using a PerkinElmer™ Lambda 900 spectrometer. The results are shown in FIG. 1 and discussed below.

Example 1

[0105] A solution/mixture was prepared using the components shown below in Table 2 and the same approach as Comparative Example 1.

TABLE-US-00002 TABLE 2 showing the mass of each component used for the solution prepared in Example 1 Uvinul ™ BYK ™ -345 Conc. HNO.sub.3 3050 Ethanol Glycerol (5% Ethanol) GPTMS TEOS (5% Ethanol) Water (g) (g) (g) (g) (g) (g) (g) (g) 2.5 13.9 15 0.8 11.3 22.6 0.5 33.4

[0106] Following stirring, the solution/mixture was aged by allowing it to stand for 12 hr at 5° C. A clear (flint) bottle at a temperature of 120° C. was then spray coated with the solution/mixture using the same approach as Comparative Example 1. The applied solution/mixture was then cured at 200° C. for 1 hr.

[0107] The light transmission characteristics of the resultant coated bottle were tested as in Comparative Example 1. The results are shown in FIG. 1 and discussed below.

[0108] Results

[0109] UV Blocking Capability

[0110] FIG. 1 shows a graph of percentage transmission vs wavelength for an uncoated colourless bottle (light grey curve), the coated bottle prepared in Comparative Example 1 (dark grey curve) and the coated bottle prepared in Example 1 (asterisked curve). As will be noted, both the bottles of Comparative Example 1 and of Example 1 exhibit UV blocking capability in comparison with an uncoated colourless bottle. Indeed, the bottle of Example 1 performs slightly better than the bottle of Comparative Example 1 in this regard.

[0111] Durability to Humidity

[0112] Two clear (flint) bottles were coated: one according to Comparative Example 1 and one according to Example 1. A sample with dimensions of approximately 4 cm×3 cm and a thickness the same as the thickness of the bottle was cut from the body of each bottle.

[0113] These samples were assessed via humidity testing to investigate their resistance to harsh environments. The machine used was a Thermotron™ 7800 Environmental Chamber and the conditions were 95% humidity and 50° C. The samples were checked after 24 hours and after 48 hours.

[0114] After 24 Hours:

[0115] Comparative Example 1 Sample—coating delamination had occurred. Patchy coating remaining on sample.

[0116] Example 1 Sample—coating had no clear defects visually, and no signs of delamination.

[0117] After 48 hours:

[0118] Comparative Example 1 Sample—further delamination of coating with less coverage of coating apparent.

[0119] Example 1 Sample—coating had no clear defects visually, and no signs of delamination.

[0120] These results clearly demonstrate the improved durability to humidity of the coated glass substrates of the present invention.

[0121] The invention is not restricted to the details of the foregoing embodiments. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.