EP3850050A1 - Composition de revêtement non écaillant - Google Patents

Composition de revêtement non écaillant

Info

Publication number
EP3850050A1
EP3850050A1 EP19860446.4A EP19860446A EP3850050A1 EP 3850050 A1 EP3850050 A1 EP 3850050A1 EP 19860446 A EP19860446 A EP 19860446A EP 3850050 A1 EP3850050 A1 EP 3850050A1
Authority
EP
European Patent Office
Prior art keywords
glass substrate
splinter
coating composition
proof coating
glass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19860446.4A
Other languages
German (de)
English (en)
Other versions
EP3850050A4 (fr
Inventor
Pradeep KAPADIA
Francois GULLIEMOT
Sivasankar JEYABASKARAN
Ashik V A Mohammed
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saint Gobain Glass France SAS
Compagnie de Saint Gobain SA
Original Assignee
Saint Gobain Glass France SAS
Compagnie de Saint Gobain SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Saint Gobain Glass France SAS, Compagnie de Saint Gobain SA filed Critical Saint Gobain Glass France SAS
Publication of EP3850050A1 publication Critical patent/EP3850050A1/fr
Publication of EP3850050A4 publication Critical patent/EP3850050A4/fr
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D153/00—Coating compositions based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
    • C09D153/02—Vinyl aromatic monomers and conjugated dienes
    • C09D153/025—Vinyl aromatic monomers and conjugated dienes modified
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/01—Hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
    • C08L53/025—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes modified
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D153/00—Coating compositions based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
    • C09D153/02—Vinyl aromatic monomers and conjugated dienes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation

Definitions

  • the present disclosure relates, in general to a coating composition, and more specifically to a splinter-proof coating composition for glass and a method of obtaining a fragmentation retention glass substrate.
  • safety glazing generally refers to any type of glass engineered to reduce the potential for serious injury when it comes into human contact.
  • toughened glass has to be one of the most significant architectural advancements of the modern age. Used in a vast array of applications, from windows and doors, to furniture, flooring and cookware, in many ways toughened glass has helped revolutionize the way we build and the way we live. Toughened or tempered glass is up to five times stronger than regular plate glass, can withstand surface compression of more than 10,000 psi and is highly resistant to thermal breakage. Nevertheless, they are not indestructible either.
  • a tempered glass When a tempered glass is broken, it shatters into thousands of tiny pebbles. In many respects these pebbles are far safer than the razor-sharp shards of a regular annealed glass. This is why a toughened glass is classed as a safety glass and is specified in areas where safety is a concern. However, in certain circumstances these tiny pebbles can still pose a danger. For example, a glass balustrade, spandrel or overhead glazing that shatters and falls from its frame could cause significant injury to passers-by underneath these structures. From time to time, these tempered glasses are known to break, seemingly without any reason, hence rightly termed as spontaneous glass breakage. Ideally the spontaneous glass breakage could be triggered by microscopic internal defects in the glass, minor damages caused during installation, tight binding of the glass in the frame and inadequate glass thickness to resist wind load.
  • the self-adhesive protective film comprises a polyolefinic support layer and a self-adhesive layer made of block copolymers comprising butadiene and isoprene and adhesive resins.
  • the above mentioned coatings or films are associated with difficulties such as pasting of film after cutting the glass into small pieces, bubble formation during film application, delamination, exposed edges prone to edge corrosion, low productivity rate and high production and installation cost.
  • block copolymers comprising butadiene and isoprene provide high tensile strength and elongation, the adhesion properties of these compounds are significantly low due to their lower surface tension. Furthermore, these compounds exhibit low solubility in solvents and hence require a high solvent content as high as 80% in order to achieve low viscosity.
  • the present disclosure relates to a simple, cost-effective coating composition for glass and mirror that prevents scattering of glass pieces at the time of breakage of the glass substrate and mirror.
  • the splinter-proof coating composition comprises 30 to 60 wt. % of one or more elastomers based on block copolymers, 20 to 50 wt. % of aliphatic hydrocarbons and 10 to 30 wt. % of aromatic hydrocarbons. Further the coating composition does not contain any flammable compounds such as PET or vinyl chloride and exhibits high thermal degradation resistance, high solubility, low viscosity and possesses Newtonian rheology even with 50% solid content.
  • the present disclosure also relates to a method for obtaining a fragmentation retention glass substrate and mirror using the coating composition described in the present disclosure.
  • a splinter-proof coating composition for glass comprises 30 to 60 wt. % of one or more elastomers based on block copolymers containing polymer blocks formed from vinyl aromatics (A blocks), preferably styrene, and those formed by polymerization of 1, 3-dienes (B blocks), preferably butadiene or isoprene or their hydrogenation products or grafted products; 20 to 50 wt. % of aliphatic hydrocarbons, preferably C5 aliphatic hydrocarbons; and 10 to 30 wt. % of aromatic hydrocarbons, preferably C9 aromatic hydrocarbons dissolved in a solvent.
  • the splinter-proof coating composition withstands heat treatments as high as 310 °C.
  • a method of obtaining a fragmentation retention glass substrate comprises the steps of: physical activation of a glass substrate, optionally treating the activated glass substrate with adhesion promoters, providing a layer of the splinter-proof coating composition over the surface of the glass substrate and curing the coated glass substrate below 310 °C.
  • a method of obtaining a fragmentation retention mirror comprises the steps of: physical activation of a glass substrate, chemical activation of the physically activated glass substrate, sensitization of the chemically activated glass substrate, providing a metallic coating on the surface of the activated glass substrate, passivating the metal coated glass substrate, optionally pre-heating the passivated metal coated glass substrate to a temperature below 80 °C, overlying the passivated metal coated glass substrate with a corrosion protective paint, optionally curing the painted glass substrate at a temperature ranging between 40 °C and 100 °C, providing a layer of the splinter-proof coating composition as claimed in claim 1 over the painted glass substrate and curing the coated glass substrate at a temperature below 310 °C.
  • FIG. 1 illustrates a cross-sectional view of a fragmentation retention glass 100, according to one embodiment of the present disclosure
  • FIG. 2 illustrates a cross-sectional view of a fragmentation retention lacquered glass 200, according to one embodiment of the present disclosure
  • FIG. 3 illustrates a cross-sectional view of a fragmentation retention mirror 300, according to one embodiment of the present disclosure
  • FIG. 4 depicts the steps involved in obtaining a fragmentation retention glass substrate, according to one embodiment of the present disclosure.
  • FIG. 5 depicts the steps involved in obtaining a fragmentation retention mirror, according to an embodiment of the present disclosure.
  • Embodiments disclosed herein are related to a splinter-proof coating composition for glass that prevents scattering of glass pieces at the time of breakage of the glass substrate.
  • FIG. 1 illustrates a fragmentation retention glass 100, in accordance with an embodiment of the present disclosure.
  • the fragmentation retention glass 100 comprises of a glass substrate 110 provided with a splinter- proof coating composition 120 over the surfaces 102 of the glass substrate 110.
  • the splinter-proof coating composition 120 comprises of 30 to 60 wt. % of one or more elastomers based on block copolymers containing polymer blocks formed from vinyl aromatics (A blocks) and polymerization of 1, 3-dienes (B blocks), or their hydrogenation products or grafted products, 20 to 50 wt. % of aliphatic hydrocarbons and 10 to 30 wt. % of aromatic hydrocarbons dissolved in a solvent.
  • the vinyl aromatic is styrene.
  • the polymerization products of 1, 3-dienes (B blocks) can be selected from butadiene or isoprene or their hydrogenation products or grafted products.
  • the block copolymer can be styrene butadiene styrene (SBS) or styrene isoprene styrene (SIS).
  • the block copolymer can be styrene ethylene butadiene styrene (SEBS) or styrene isoprene butadiene styrene (SIBS).
  • the aliphatic hydrocarbons are C5 aliphatic hydrocarbons selected from the group consisting of trans-l,3- pentadiene, cis-l,3-pentadiene, 2-methyl-2-butene, dicyclopentadiene, cyclopentadiene, cyclopentene or their combinations thereof.
  • the aromatic hydrocabons are C9 aromatic hydrocarbons selected from the group consisting of vinyl toluenes or their isomers, dicyclopentadiene, indene, methyl styrene, styrene, methylindenes or their combinations thereof.
  • the solvent for the coating composition 120 may be any one of xylene, hexane, heptane, cyclohexane, ethyl benzene, toluene, ketones (unbranched), acetone, esters, glycol esters, ethyl alcohol, butyl alcohol or ethyl hexanol.
  • the splinter-proof coating composition 120 is made in a reactor by first adding a required amount of solvent in a reflex cleaned reactor.
  • the solvent may optionally be heated for better and faster dissolution.
  • About 30 to 60 wt. % of one or more elastomers based on block copolymers are added to the solvent and mixed until complete or partial dissolution of the block copolymers.
  • about 20 to 50% C5 aliphatic hydrocarbon is added and mixed well.
  • 10 to 30 % C9 aromatic hydrocarbon is added and mixed until complete dissolution.
  • the splinter-proof coating composition 120 forms a protective top coat over the glass substrate 110 and prevents scattering of glass pieces on breakage of the glass substrate 110.
  • the splinter-proof coating composition 120 forms a transparent self-adhesive film on the surface 101 and/or 102 of the glass substrate 110 and the glass pieces formed on breakage of the glass adheres to the film thereby preventing them from scattering.
  • the splinter-proof coating composition 120 has a viscosity ranging between 350 cps and 5000 cps with Brookfield viscometer spindle no.28 at ambient temperature.
  • the splinter-proof coating composition 120 has Newtonian rheology with up to 50% solid content.
  • the thickness of the splinter-proof coating composition 120 varies from 30 m to 300 m. In a preferred embodiment, the thickness of the splinter-proof coating composition 120 ranges between 50 m and 100 m.
  • the SEBS provides increased tensile strength and elongation to the splinter-proof coating composition 120 and makes it viscoelastic.
  • SEBS when SEBS is used alone in a composition, it cannot be coated at room temperature and requires an increased amount of solvent to achieve Newtonian rheology.
  • the splinter-proof coating composition 120 of the present disclosure has Newtonian rheology with 45% solid content. Whereas the composition with only SEBS has a Newtonian rheology with only 30% solid content.
  • the C5 aliphatic hydrocarbons present in the splinter-proof coating composition 120 of the present disclosure increases the adhesion property of the coating composition 120 and decreases the viscosity thereby enabling the splinter-proof coating composition 120 to be compatible for coating on the surface 101 and/or 102 of the glass substrate 110.
  • the C5 aliphatic hydrocarbons also help in achieving Newtonian rheological behavior and increase the solid content of the splinter-proof coating composition 120.
  • the C5 aliphatic hydrocarbons increases the surface tackiness of the splinter-proof coating composition 120 thereby rendering the composition sticky and non transportable.
  • the C9 aromatic hydrocarbons present in the splinter-proof coating composition 120 of the present disclosure aids in decreasing surface tackiness that compensates for the increase in surface tackiness caused by the C5 aliphatic aromatics in the splinter-proof coating composition 120 of the present disclosure. Further the C9 aromatic hydrocarbons increase adhesion property of the splinter-proof coating composition 120.
  • SEBS in the coating composition provides high tensile strength and elongation which is paramount for developing a coating composition that prevents the scattering of glass pieces at the time of breakage of the glass substrate, SEBS does not exhibit good adhesion property owing to its low surface tension. Further SEBS exhibits low solubility in solvents and hence to achieve a low viscosity and Newtonian rheology, solvent levels of up to 80% are required. C5 aliphatic hydrocarbons when added, reduce the viscosity of the splinter-proof coating composition 120 but however makes the coated surface of the glass substrate sticky thereby rendering a coated glass substrate non transportable.
  • the block copolymer, the C5 aliphatic hydrocarbons, the C9 aromatic hydrocarbons and the solvent present in the splinter-proof coating composition 120 of the present disclosure individually contribute for achieving the desired properties of the splinter-proof coating composition 120 of the present disclosure viz., adhesion Class 0-2, 750 cps -1440 cps viscosity with Brookfield viscometer spindle no. 28 at ambient temperature and stickiness and transportability.
  • the block copolymer, the C5 aliphatic hydrocarbons, the C9 aromatic hydrocarbons and the solvent work in synergy to obtain the above mentioned desired property of the splinter-proof coating composition 120.
  • the fragmentation retention lacquered glass 200 of the present disclosure comprises of a lacquered glass substrate 250 that contains a glass substrate 210 coated with a lacquer or paint 220 on one of its surface 202. Any conventional lacquer or paint available in the market could be used for this embodiment of the present disclosure. Further the lacquer or paint may contain any pigment.
  • a layer of the splinter-proof coating composition 120 of the present disclosure is provided over the lacquer 220 .
  • the splinter-proof coating composition 120 is provided to a completely cured lacquered glass substrate 250.
  • the splinter-proof coating composition 120 can be provided to a partially cured lacquered glass substrate 250.
  • the splinter-proof coating composition 120 is applied to a half cured lacquered glass substrate 250, there exists a miscible region between the lacquer or paint 220 and the layer containing the splinter- proof coating composition 120.
  • the miscible region provides for intermixing or diffusion between the lacquer and the splinter-proof coating composition 120.
  • the curing process may be performed intermittently at temperatures ranging between 50 °C to 100 °C for a period of 0.5 to 5 minutes between the curing step performed after coating the lacquer or paint 220 and the curing step performed after providing the splinter-proof coating composition 120.
  • the splinter-proof coating composition 120 can be provided directly on an uncured lacquered glass substrate.
  • the curing step is performed only after the coating of the splinter-proof coating composition 120 thereby reducing the number of processing steps involved in the manufacture of a fragmentation retention lacquered glass substrate 200. This embodiment illustrates the economic advantage of the product produced from the present disclosure.
  • FIG. 3 illustrates a fragmentation retention mirror 300, according to one embodiment of the present disclosure.
  • the fragmentation retention mirror 300 of the present disclosure comprises of a mirror 350 that contains a glass substrate 310 provided with a metallic coating 320 and a protective paint layer 330 in sequential order away from the glass substrate 310.
  • the metallic coating 320 comprises of one or more metals selected from silver or aluminum. Any conventional mirrors available in the market could be used for this embodiment of the present disclosure.
  • Provided over the protective paint layer 330 is a coating of the splinter-proof coating composition 120 of the present disclosure.
  • the splinter-proof coating composition 120 is provided to a completely cured mirror 350. In another embodiment of the present disclosure, the splinter-proof coating composition 120 can be provided to a partially cured mirror 350. In embodiments where the splinter-proof coating composition 120 is applied to a partially cured mirror 350, there exists a miscible region between the protective paint layer 330 and the layer containing the splinter-proof coating composition 120. The miscible region provides for intermixing or diffusion between the protective paint and the splinter-proof coating composition 120. In such an embodiment, the curing process may be performed intermittently between the curing step performed after coating the protective paint layer 330 and the curing step performed after the coating of the splinter-proof coating composition 120.
  • the splinter-proof coating composition 120 can be provided directly on an uncured mirror.
  • the curing step is performed only after the coating of the splinter-proof coating composition 120 thereby reducing the number of processing steps involved in the manufacture of a fragmentation retention mirror 300.
  • the fragmentation retention glass 100, fragmentation retention lacquered glass 200 and the fragmentation retention mirror 300 exhibit corrosion resistance against chemicals whereby the splinter-proof coating composition 120 that forms the top coat of the fragmentation retention glass 100, fragmentation retention lacquered glass 200 and the fragmentation retention mirror 300 is resistant to both acidic and alkaline solutions with an exemption to aliphatic hydrocarbon, amyl acetate, amyl alcohol, amyl chloride, aromatic hydrocarbon, benzaldehyde, benzene, benzoic acid, benzyl alcohol, butane, butyl acetate, carbon disulfide, chlorobenzene, chlorobromomethane, chloroform, cyclohexane, cyclohexanone, ethers, gasoline, kerosene, lacquer solvents, linseed oil, methane, naphta, natural gas, nitrobenzene, phenol, phtalic acid, styrene,
  • the splinter-proof coating composition 120 may be coated using any of the coating techniques selected from the group consisting of spray coating, bar coating, curtain coating, brush coating or other wet coating techniques.
  • the fragmentation retention glass 100, fragmentation retention lacquered glass 200 and the fragmentation retention mirror 300 can be subjected to post processing steps including, cutting, transporting, edge grinding and heat treatment at temperatures below 310 °C.
  • the fragmentation retention glass 100, fragmentation retention lacquered glass 200 and the fragmentation retention mirror 300 exhibit superior scratch resistance.
  • a reactor was cleaned by reflex cleaning using a solvent. About 55% of xylene was added to the reactor. Xylene was heated to a temperature of 40-100 °C to speed-up dissolution rate. About 30% to 60% SEBS to the overall solid content of the splinter-proof coating composition was added into the reactor and mixed until complete dissolution of SEBS in xylene. About 20% to 50% C5 aliphatic hydrocarbon viz., Rishitac Q1100 of overall solid content was added into the reactor until completely dissolved. Then about 10% to 30 % C9 aromatic hydrocarbon viz., GA 115B of overall solid content was added into the reactor and mixed well.
  • 50 m thick splinter-proof coating composition was coated on a 300x300 mm mirror and placed in an oven at 200 °C for about 7 minutes. The coated mirror sample was then removed and cut into 100x25 mm pieces after cooling down the sample to ambient temperature. The mirror pieces were then scored in the middle and snapped to the Universal tensile strength equipment without damaging the coating. The rate of loading was maintained at 50 mm/min. Adhesion Test:
  • the adhesion of the coating compositions on glass substrates was measured by cross-hatch (ASTM standard D 3359-00, 6 teeth, 2mm, with brushing and with adhesive tape peel). The adhesion values ranged between 0 and 5.
  • Peel Test Coating composition of the present disclosure coated on 100 x 20 mm mirror samples were scored and snapped at the center of the samples. The peel test was performed at an angle of 90° to the surface of the samples at a rate of 50 mm/ minute.
  • the chemical resistance of the coating compositions was tested using ASTM Standard B 117.
  • the coating composition of the present disclosure was coated on glass samples and exposed to a highly acidic condition for 120 hours.
  • An acidic solution was prepared by dissolving 5% NaCl in 0.26 g/liter of CuCl 2 .2H 2 0 and added with acetic acid until the pH of the solution reaches 3.0 - 3.1. Post which the surface and edge corrosion of the coated samples were measured using stereo microscope.
  • the resistance of the samples to high humidity conditions was tested by the Standard EN1036.
  • the samples were exposed to 40°C and >95% relative humidity for a period of 20 days for mirror samples and a period of 21 days for lacquered glass samples.
  • the samples were then tested for appearance of surface corrosion, edge corrosion and further DE* values of the samples were also measured.
  • Corrosion test was carried out on a 50 x 50 mm sample by immersing the sample in Cupro-hydrochloric salt solution (100 g/L of NaCL, 10 g/L of CuCl2. 2H20 and 10 ml of HC1) for 1.5 h at 60oC by placing the paint side facing downwards. The sample was later cut by CNC on the paint side and corrosion levels of these samples were compared with the corrosion level of samples cut manually on the glass side.
  • Cupro-hydrochloric salt solution 100 g/L of NaCL, 10 g/L of CuCl2. 2H20 and 10 ml of HC1
  • Table 1 clearly depicts that while the comparable samples fail in most of the experiments the splinter-proof coating composition of the present disclosure clears the specification of all the tests.
  • Table 2 illustrates that the splinter-proof coating composition of the present disclosure achieves all the desired properties compared to all the comparative samples.
  • the performance of the splinter-proof coating composition was tested using the Standard EN12600 (Pendulum impact testing).
  • the penetration proof of glass substrates coated with splinter-proof coating composition of the 10 present disclosure was measured by the Standard EN12600.
  • the results of the performance testing are summarized in Table 3.
  • Lacquered glass substrates of 100 x 100 mm and 100 x 100 mm mirror substrates were coated with the splinter-proof coating composition of the 20 present disclosure and tested for their durability performance.
  • the results of the durability testing are summarized in Table 4. The following tests were performed to evaluate the durability performance of glass substrates coated with the splinter- proof coating composition of the present disclosure.
  • the resistance of the glass and mirror samples was tested using ASTM Standard B117.
  • the glass samples were exposed to a neutral salty condition for a period of 20 days.
  • a neutral solution of 5% NaCl was used for this test.
  • Post which the surface and edge corrosion of the coated samples were measured using stereo microscope.
  • the scratch resistance of the lacquered glass samples and mirror samples was measured by ISO Standard 4586-2. Samples were rotated in a circular manner on the machine and using a diamond tip.
  • the tensile strength of 100 x 20 mm mirror samples was measured by scoring and snapping the mirror samples in the center at a rate of 10 mm/minute.
  • the splinter-proof coating composition of the present disclosure was found to exhibit good durability.
  • Corrosion Resistance Testing Corrosion resistance of a mirror provided with a splinter-proof coating composition of the present disclosure was measured and compared with the corrosion resistance of a conventionally available mirror. Results of the tests are summarized in Table 5.
  • any glass substrates including annealed, tempered, heat strengthened, mirrored and lacquered glass substrates can be converted into a safety glass substrate, wherein the substrates coated with said splinter-proof coating composition prevents scattering of glass pieces at the time of breakage of the glass substrate.
  • the splinter-proof coating composition 120 of the present disclosure can be applied as a temporary coating on glass substrates that protects the glass substrates from scratches during transportation.
  • the splinter-proof coating composition 120 offers the coated glass substrates resistance against a wide range of acidic and alkaline solutions and moisture thereby preventing corrosion.
  • lacquered glass substrates, mirror and clear glass substrates coated with the coating composition of the present disclosure can be readily used for interior applications in a building not limited to wall cladding, curtain walling, furnitures, flooring, cookware, railing etc. Similarly, these can be used for exterior applications in a building not limited to window glazing, insulated glazing, spandrels, balusters etc.
  • the present disclosure further discloses a method 400 depicted in FIG. 4 of obtaining a fragmentation retention glass substrate, according to one embodiment of the present disclosure.
  • the method 400 comprises of steps 410 to 440.
  • the fragmentation retention glass 100 illustrated in FIG. 1 may be obtained by performing all or selected steps of the method 400 in the same or an altered order depicted in FIG. 4.
  • the glass substrate is physically activated.
  • the glass substrate is cleaned with DI water and polished with ceria powder in order to remove any surface contamination that may be present on the surface of the glass substrate.
  • the glass substrate may be selected from a clear glass, a tinted glass or a lacquered glass substrate.
  • step 420 the physically activated glass substrate is treated with adhesion promoters such as silane, organosilane, oligomeric silane, chlorinated and non-chlorinated polyolefin, organotitanates, organozirconates or organoaluminate.
  • adhesion promoters such as silane, organosilane, oligomeric silane, chlorinated and non-chlorinated polyolefin, organotitanates, organozirconates or organoaluminate.
  • step 420 may be skipped if the coating composition of the present disclosure is to be applied as a temporary coating on the glass substrate. Nevertheless, treating the glass substrate with adhesion promoters improves the adhesion property of the glass substrate and thereby enables better adhesion between the glass substrate and the coating composition of the present disclosure.
  • the splinter-proof coating composition pf the present disclosure is coated on the glass substrate by curtain coating.
  • the splinter-proof coating composition may also be coated using other coating techniques such as spray coating, dip coating, wet coating techniques, bar coating and spin coating.
  • the viscosity of the splinter-proof coating composition is selected and optimized according to the coating technique selected for performing this step.
  • the thickness of the splinter-proof coating composition ranges between 50 m and 100 m.
  • the coated glass substrate is cured at a temperature below 250 °C for a period of 1 to 15 minutes. On curing the splinter-proof coating composition forms a thin transparent film on the surface of the glass substrate.
  • the coated glass substrate obtained from performing method 400 may be further treated with adhesion promoters listed earlier and provided with a protective top coat comprising acrylate solutions. This top coat improves the resistance of the glass substrates against hydrophilic solutions and solvents.
  • the splinter-proof coating composition of the present disclosure may either be applied as the outermost layer over the paint layer of the lacquered glass substrate or may be applied between the glass substrate and the paint layer. In the latter case the paint layer forms the outermost layer of the fragmentation retention lacquered glass substrate.
  • the curing step involved in obtaining a fragmentation retention lacquered glass substrate may be performed once after subsequent coating of the paint layer and the coating composition layer of the present disclosure in any sequential order. This embodiment is advantageous in that it brings down the number of processing steps and production time involved in obtaining a fragmentation retention lacquered glass substrate.
  • the curing step may be performed sequentially once after application of the paint layer and repeated again after the application of the coating layer of the present disclosure.
  • the curing temperature and time involved in obtaining a fragmentation retention lacquered glass substrate may be balanced and performed intermittently both after the application of the paint layer and application of the coating layer of the present disclosure.
  • the present disclosure further discloses a method 500 depicted in FIG. 5 of obtaining a fragmentation retention mirror, according to one embodiment of the present disclosure.
  • the method 500 comprises of steps 510 to 580.
  • the fragmentation retention mirror 300 illustrated in FIG. 3 may be obtained by performing all or selected steps of the method 500 in the same or an altered order depicted in FIG. 5.
  • step 510 the glass substrate is physically activated.
  • the glass substrate is cleaned with DI water and polished with ceria powder in order to remove any surface contamination that may be present on the surface of the glass substrate.
  • the glass substrate is chemically activated and sensitized.
  • the glass substrate is coated with stannous chloride and palladium chloride solutions.
  • the chemical activation and sensitization steps ensure good adhesion between the silver layer and glass surface.
  • the coated glass surface is cleaned with DI water to remove any residual solutions that may be present on its surface.
  • Step 540 involves providing a metallic coating to the glass substrate, where the glass substrate is treated with silver nitrate solution and the reducer solution viz., ammonia is sprayed on the coated glass substrate. During this elemental silver gets deposited on the surface of the glass substrate.
  • step 550 stannous chloride is sprayed on the silvered glass substrate to passivate the glass substrate and further silane solution is sprayed on the surface of the substrate in order to obtain a good adhesion between the silver layer and the paint layer that is to be coated on the glass substrate in the next step.
  • the step of spraying silane on the silvered glass substrate may be optional.
  • step 560 the silvered glass substrate is pre-heated to a temperature or 80 °C and provided with a protective paint layer by curtain coating or spray coating. The paint layer protects the mirror surface from atmospheric corrosion.
  • the silvered glass substrate may be treated with adhesion promoters mentioned earlier before applying the paint layer.
  • the mirror is cured at a temperature between 40 °C and 100 °C.
  • the curing step may be optional.
  • the splinter-proof coating composition of the present disclosure is applied on the mirror using curtain coating. The thickness of the coating ranges between 50 m and 100 m. In alternate embodiments, other coating techniques such as spray coating, dip coating, wet coating techniques, bar coating and spin coating may also be used. In multiple embodiments of the present disclosure, the splinter-proof coating composition of the present disclosure may be applied on the surface of a fully cured mirror or a partially cured mirror or an uncured mirror.
  • step 580 the mirror provided with the splinter-proof coating composition of the present disclosure is cured at a temperature below 250 °C to obtain a fragmentation retention mirror that instantly prevents scattering of broken mirror pieces at the time of breakage of the mirror.
  • the curing process is performed intermittently both after the application of the protective paint layer and application of the coating layer of the present disclosure.
  • the terms “comprises,” “comprising,” “includes,” “including,” “has,” “having” or any other variation thereof, are intended to cover a non-exclusive inclusion.
  • a method, article, or apparatus that comprises a list of features is not necessarily limited only to those features but may include other features not expressly listed or inherent to such method, article, or apparatus.
  • “or” refers to an inclusive-or and not to an exclusive-or. For example, a condition A or B is satisfied by any one of the following: A is true (or present) and B is false (or not present), A is false (or not present) and B is true (or present), and both A and B are true (or present).

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Surface Treatment Of Glass (AREA)
  • Paints Or Removers (AREA)

Abstract

La présente invention concerne une composition de revêtement non écaillant pour verre comprenant de 30 à 60 % en poids d'un ou plusieurs élastomères à base de copolymères séquencés contenant des séquences polymères formées à partir de composés vinylaromatiques (séquences A), de préférence du styrène, et celles formées par polymérisation de 1,3-diènes (séquences B), de préférence du butadiène ou de l'isoprène ou leurs produits d'hydrogénation ou leurs produits greffés ; de 20 à 50 % en poids d'hydrocarbures aliphatiques, de préférence des hydrocarbures aliphatiques en C5 et de 10 à 30 % en poids d'hydrocarbures aromatiques, de préférence des hydrocarbures aromatiques en C9 dissous dans un solvant. La composition de revêtement non écaillant empêche la diffusion de morceaux de verre au moment de la cassure du substrat de verre. La présente invention concerne également un procédé d'obtention d'un substrat de verre à rétention de fragmentation et un miroir à rétention de fragmentation. Le substrat de verre peut être un verre transparent, un verre à revêtement fonctionnel ou un verre laqué qui est recuit, trempé ou renforcé à la chaleur.
EP19860446.4A 2018-09-10 2019-09-10 Composition de revêtement non écaillant Pending EP3850050A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201841033996 2018-09-10
PCT/IN2019/050652 WO2020053880A1 (fr) 2018-09-10 2019-09-10 Composition de revêtement non écaillant

Publications (2)

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EP3850050A1 true EP3850050A1 (fr) 2021-07-21
EP3850050A4 EP3850050A4 (fr) 2022-06-15

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EP19860446.4A Pending EP3850050A4 (fr) 2018-09-10 2019-09-10 Composition de revêtement non écaillant

Country Status (2)

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EP (1) EP3850050A4 (fr)
WO (1) WO2020053880A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19906333C2 (de) 1999-02-16 2002-09-26 Schott Glas Verfahren zum Schützen der Oberfläche von Glassubstraten sowie Verwendung des Verfahrens zur Herstellung von Displayglas
DE10141378A1 (de) 2001-08-23 2003-04-30 Tesa Ag Oberflächenschutzfolie für lackierte Flächen mit einem Kleber auf Basis von hydrierten Blockcopolymeren
US20060263596A1 (en) * 2005-05-06 2006-11-23 Bamborough Derek W Pressure sensitive adhesives (PSA) laminates
US20070231571A1 (en) * 2006-04-04 2007-10-04 Richard Lane Pressure sensitive adhesive (PSA) laminates
JP5495567B2 (ja) * 2006-11-01 2014-05-21 株式会社カネカ 硬化性有機重合体とその製造方法、および、これを含有する硬化性組成物
US20140004331A1 (en) 2011-03-09 2014-01-02 Nitto Denko Corporation Shatterproofing member with hardenable pressure-sensitive adhesive layer
CN104428268A (zh) * 2012-05-25 2015-03-18 日本瑞翁株式会社 夹层玻璃、以及将嵌段共聚物氢化物用作夹层玻璃的粘接剂的方法
ES2748111T3 (es) * 2013-09-25 2020-03-13 Kuraray Co Composición polimérica termoplástica, cuerpo en capas, y película protectora

Also Published As

Publication number Publication date
EP3850050A4 (fr) 2022-06-15
WO2020053880A1 (fr) 2020-03-19

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