# US 9,752,048 B2 · Multilayer coating, production and use thereof for the adhesion of glass panes > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,048 B2 - Document ID: US9752048B2 - Status: Granted - Kind: B2 - Application number: 13/265,746 - Filed: 2010-04-21 - Published: 2012-02-23 - Granted: 2017-09-05 - Earliest claimed: 2009-04-21 - Assignees: BASF Coatings GmbH - Applicants: Norbert Low; Jorn Lavalaye; Alexandra Steffens - Inventors: Norbert Low; Jorn Lavalaye; Alexandra Steffens - Web page: https://patentgrep.com/patent/US9752048B2 ## CPC - C09D 161/00: Coating compositions based on condensation polymers of aldehydes or ketones (with polyalcohols C09D159/00; with polynitriles C09D177/00); Coating compositions based on derivatives of such polymers - B32B 17/10036: {comprising two outer glass sheets} - B32B 17/1055: {characterized by the resin layer, i.e. interlayer} - C08J 5/00: Manufacture of articles or shaped materials containing macromolecular substances (manufacture of semi-permeable membranes B01D67/00 - B01D71/00) - Y10T 156/10: Methods of surface bonding and/or assembly therefor - Y10T 428/24975: No layer or component greater than 5 mils thick - Y10T 428/264: Up to 3 mils - Y10T 428/265: 1 mil or less - Y10T 428/2848: Three or more layers - 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 (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A multilayer coating comprising (A) a multicoat paint system comprising (A1) at least one basecoat of a basecoat material comprising at least one melamine resin, and (A2) at least one clearcoat as the topmost coat of the multicoat paint system, and (B) an adhesive layer of a moisture-curing, isocyanate-based adhesive directly atop the topmost clearcoat layer of the multicoat paint system, wherein (i) all amino resins present in the basecoat material are fully methylolated, fully etherified melamine resins in which at least 90% of the etherified methylol groups are etherified with butanol, and (ii) the basecoat material contains at least 1.0% by weight, based on the total weight of the basecoat material, of at least one polyester binder having a hydroxyl number of at least 240 mg KOH/g and an acid number of not more than 10 mg KOH/g, and also a corresponding basecoat material and method of producing, and use of, the multilayer coating for adhesively bonding glass sheets. ## Claims ### Claim 1 A multilayer coating comprising: (A) a multicoat paint system comprising: (A1) at least one basecoat of a basecoat material that is water-free and comprises: at least one amino resin that is a fully methylolated, fully etherified melamine resin in which at least 90% of the etherified methylol groups are etherified with butanol, at least 1.0% by weight, based on the total weight of the basecoat material, of at least one polyester binder having a hydroxyl number of at least 240 mg KOH/g and an acid number of not more than 10 mg KOH/g, (A2) at least one clearcoat as a topmost coat of the multicoat paint system; and (B) an adhesive layer of a moisture-curing, isocyanate-based adhesive directly atop the clearcoat; wherein the basecoat material comprises no further amino resins. ### Claim 2 (depends on 1) The multilayer coating of claim 1, wherein the at least one amino resin present in the basecoat material (A1) comprises at least 95% of butanol-etherified methylol groups, based on all of the etherified methylol groups. ### Claim 3 (depends on 1) The multilayer coating of claim 1, wherein the basecoat material (A1) comprises 8% to 15% by weight, based on the total weight of the basecoat material, of the melamine resin. ### Claim 4 (depends on 1) The multilayer coating of claim 1, wherein the basecoat material (A1) comprises 1% to 6% by weight, based on the total weight of the basecoat material, of said at least one polyester binder. ### Claim 5 (depends on 1) The multilayer coating of claim 1, wherein said at least one polyester binder has a hydroxyl number of 270 mg KOH/g to 300 mg KOH/g and an acid number of not more than 5 mg KOH/g. ### Claim 6 (depends on 1) The multilayer coating of claim 1, wherein said at least one polyester binder comprises structural units which originate from aliphatic, cycloaliphatic and/or aromatic dicarboxylic and/or polycarboxylic acids and from diols and/or polyols. ### Claim 7 (depends on 1) The multilayer coating of claim 1, wherein said at least one polyester binder has a weight-average molecular weight of 400 to 2500 g/mol. ### Claim 8 (depends on 1) The multilayer coating of claim 1, which has precisely one basecoat having a dry film thickness of 10 to 25 μm and precisely one clearcoat having a dry film thickness of 25 to 70 μm. ### Claim 9 (depends on 1) The multilayer coating of claim 1, wherein the at least one polyester has an acid number of from 2.2 mg KOH/g to not more than 5 mg KOH/g. ### Claim 10 (depends on 1) The multilayer coating of claim 1, wherein the basecoat material (A1) comprises, by weight: (i) 8% to 15% of the melamine resin; (ii) 1% to 6% of the one polyester binder; (iii) 10% to 30% of a further binder; and (iv) 30% to 70% of an organic solvent. ### Claim 11 (depends on 1) The multilayer coating of claim 1, wherein said at least one basecoat (A1) has a dry film thickness of 10 to 25 μm. ### Claim 12 (depends on 11) The multilayer coating of claim 11, wherein said at least one basecoat (A1) has a dry film thickness of 15 to 25 μm. ### Claim 13 (depends on 1) The multilayer coating of claim 1, wherein said at least one clearcoat has a dry film thickness of 25 to 50 μm. ### Claim 14 (depends on 13) The multilayer coating of claim 13, wherein said at least one clearcoat has a dry film thickness of 25 to 45 μm. ### Claim 15 A basecoat material for producing a multilayer coating, the basecoat material being water-free and comprising: (i) at least one amino resin that is a fully methylolated, fully etherified melamine resin in which at least 90% of the etherified methylol groups are etherified with butanol, and (ii) at least 1.0% by weight, based on the total weight of the basecoat material, of at least one polyester binder having a hydroxyl number of at least 240 mg KOH/g and an acid number of not more than 10 mg KOH/g, wherein the basecoat material comprises no further amino resins. ### Claim 16 (depends on 15) The basecoat material of claim 15 comprising, by weight: (i) 8% to 15% of the melamine resin; (ii) 1% to 6% of the one polyester binder; (iii) 10% to 30% of a further binder; and (iv) 30% to 70% of an organic solvent.