GB1057871A - Glass mirrors having improved resistance to tarnishing - Google Patents

Glass mirrors having improved resistance to tarnishing

Info

Publication number
GB1057871A
GB1057871A GB1774762A GB1774762A GB1057871A GB 1057871 A GB1057871 A GB 1057871A GB 1774762 A GB1774762 A GB 1774762A GB 1774762 A GB1774762 A GB 1774762A GB 1057871 A GB1057871 A GB 1057871A
Authority
GB
United Kingdom
Prior art keywords
chelating agent
lacquer
atom
resins
dissolved
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.)
Expired
Application number
GB1774762A
Inventor
Thomas Edwin Johnson
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.)
Mathews John and Co Ltd
Original Assignee
Mathews John and Co Ltd
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 Mathews John and Co Ltd filed Critical Mathews John and Co Ltd
Priority to GB1774762A priority Critical patent/GB1057871A/en
Publication of GB1057871A publication Critical patent/GB1057871A/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/36Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
    • C03C17/38Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal at least one coating being a coating of an organic material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)

Abstract

The resistance to tarnishing by S and S compounds of a mirror comprising a metal layer on a glass substrate is improved by contacting a chelating agent with the external surface of the metal layer so that the chelating agent and surface react. The mirror comprises glass coated e.g. with Ag alone or Ag and then Cu. The metal layer may be treated with the chelating agent dissolved in an inert solvent such as butanol and subsequently be given a protective lacquer coating. Alternatively, it may be treated with chelating agent incorporated in lacquer optionally followed by further coating with lacquer. Specified chelating agents are nitrogenous 5-membered ring compounds having in the 5-membered ring two non-adjacent N atoms, one at least of which is attached to N, and two adjacent C atoms each of which is attached to a different N atom, and having as the fifth ring-closing atom either a tetravalent C atom or a trivalent N atom. In the case of Ag, the chelating agent may be mercaptobenzthiazole. In the case of Cu it may be benztriazole, E.D.T.A. or guanidino benzimidazole. Many lacquers are described.ALSO:The resistance to tarnishing of a mirror is improved by contacting it with a chelating agent incorporated in a lacquer. The lacquer may be a stoving lacquer produced from 85-15% alkyd resins (e.g. based on saturated or unsaturated fatty acids) and 15-85% thermosetting resins (e.g. urea formaldehyde) in admixture. In Example 1, castor oil alkyd resin containing phthalic anhydride and dissolved in an aromatic hydrocarbon solvent is mixed with a melamine formaldehyde resin dissolved in a mixture of xylene and butanol. Benzatriazole is added as chelating agent. In other examples the chelating agent is mercaptobenzthiazole (IIa), benzotriazole (IIb), guanidino-benzimidazole (IIc) and EDTA (IId). This laquer is over-coated with another composition comprising red lead, a non-drying oil alkyd, phthalic anhydride, an aromatic hydrocarbon, a melamine/formaldehyde resin, xylene and butanol.ALSO:The resistance to tarnishing by S and S compounds of a mirror comprising a metal layer on a glass substrate is improved by contacting a chelating agent with the external surface of the metal layer so that the chelating agent and surface react. The mirror comprises glass coated, e.g. with Ag alone or Ag and then Cu. The metal layer may be treated with the chelating agent dissolved in an inert solvent such as butanol and subsequently be given a protective lacquer coating. Alternatively, it may be treated with chelating agent incorporated in lacquer optionally followed by further coating with lacquer. Specified chelating agents are nitrogenous 5-membered ring compounds having in the 5-membered ring two non-adjacent N atoms, one at least of which is attached to N, and two adjacent C atoms each of which is attached to a different N atom, and having as the fifth ring-closing atom either a tetravalent C atom or a trivalent N atom. In the case of Ag, the chelating agent may be mercaptobenzthiazole. In the case of Cu it may be benztriazole, E.D.T.A. or guanidino benzimidazole. The lacquers may comprises: 1) oxygen convertible coatings such as a) varnishes prepared from a drying oil and a hard resin or b) alkyd resins based on drying oils; 2) heat convertible coatings such as a) lacquers prepared from a blend of a saturated fatty acid alkyd and an amine resin or b) epoxide resins blended with amine resins; 3) catalysed convertible coatings such as a) lacquers prepared from epoxide resins and catalysed with organic amines or polyamide resins; 4) non-convertible coatings such as a) shellac in alcoholic solution, b) an acrylic acid ester polymer in xylene solution or c) a vinyl acetate polymer dispersed in water. The lacquers may be stoving lacquers produced from 85-15% alkyd resins (e.g. based on saturated or unsaturated fatty acids) and 15-85% thermosetting resins (e.g. urea formaldehyde or melamine formaldehyde) in admixture. In Example 1, 85 parts by weight of a drying castor oil alkyd resin containing 40% of phthalic anhydride and dissolved in 85 parts by weight of an aromatic hydrocarbon solvent were mixed with 15 parts by weight of a melamine formaldehyde resin dissolved in 10 parts by weight of a mixture of xylene and butanol. To the mixture was added 3 parts of benzotriazole dissolved in 27 parts of butanol.
GB1774762A 1962-05-09 1962-05-09 Glass mirrors having improved resistance to tarnishing Expired GB1057871A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1774762A GB1057871A (en) 1962-05-09 1962-05-09 Glass mirrors having improved resistance to tarnishing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1774762A GB1057871A (en) 1962-05-09 1962-05-09 Glass mirrors having improved resistance to tarnishing

Publications (1)

Publication Number Publication Date
GB1057871A true GB1057871A (en) 1967-02-08

Family

ID=10100520

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1774762A Expired GB1057871A (en) 1962-05-09 1962-05-09 Glass mirrors having improved resistance to tarnishing

Country Status (1)

Country Link
GB (1) GB1057871A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4880668A (en) * 1986-03-27 1989-11-14 Ppg Industries, Inc. Mirror protective composition comprising 2-mercaptothiazoline
US5008153A (en) * 1988-12-08 1991-04-16 Ppg Industries, Inc. Corrosion inhibitive pretreatment for "copper-free" mirrors
GB2307194A (en) * 1995-11-20 1997-05-21 Glaverbel Protective coating for a copper-free reflective metal layer
WO2002040419A1 (en) * 2000-11-15 2002-05-23 Saint-Gobain Glass France Object with metallic layer, method for making same and uses

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4880668A (en) * 1986-03-27 1989-11-14 Ppg Industries, Inc. Mirror protective composition comprising 2-mercaptothiazoline
US5008153A (en) * 1988-12-08 1991-04-16 Ppg Industries, Inc. Corrosion inhibitive pretreatment for "copper-free" mirrors
GB2307194A (en) * 1995-11-20 1997-05-21 Glaverbel Protective coating for a copper-free reflective metal layer
GB2307194B (en) * 1995-11-20 1999-07-28 Glaverbel Method of forming a protective layer on a copper-free reflective metal layer
US6147803A (en) * 1995-11-20 2000-11-14 Glaverbel Method of forming a protective layer on a copper-free reflective metal layer
WO2002040419A1 (en) * 2000-11-15 2002-05-23 Saint-Gobain Glass France Object with metallic layer, method for making same and uses

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