# US 10,870,764 B2 · Adhesion promoter for coating compositions suitable for producing surfacer coats > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,870,764 B2 - Document ID: US10870764B2 - Status: Granted - Kind: B2 - Application number: 15/513,599 - Filed: 2015-07-31 - Published: 2019-03-28 - Granted: 2020-12-22 - Earliest claimed: 2014-09-24 - Assignees: BASF Coatings GmbH - Applicants: BASF Coatings GmbH - Inventors: Audree Andersen; Manuela Niemeier; Simone Hesener - Web page: https://patentgrep.com/patent/US10870764B2 ## CPC - C09D 5/002: {Priming paints (C09D5/08 takes precedence)} - C08G 18/4063: {Mixtures of compounds of group C08G18/62 with other macromolecular compounds} - C08G 18/42: Polycondensates having carboxylic or carbonic ester groups in the main chain - C08G 18/62: Polymers of compounds having carbon-to-carbon double bonds - C08G 18/6216: {Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof} - C08G 18/722: {Combination of two or more aliphatic and/or cycloaliphatic polyisocyanates} - C08G 18/73: acyclic - C08G 18/755: {and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate} - C08G 18/771: {oxygen} - C08G 18/792: {formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates} - C08G 18/809: {containing silicon} - C09D 175/04: Polyurethanes - C09D 175/06: from polyesters - C08G 2150/00: Compositions for coatings - C08G 2150/50: Compositions for coatings applied by spraying at least two streams of reaction components - 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) - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS ## Abstract The present invention relates to a mixture (M) which can be used as curing agent and as adhesion promoter and which comprises at least two components (M1) and (M2), which are different from one another and have in each case independently of one another free and/or blocked isocyanate groups, and which optionally comprises a further component (M3) different from (M1) and (M2); component (M1) comprises at least one aliphatic polyisocyanate, and component (M2) comprises at least one aliphatic polyisocyanate having polyether units, wherein the relative weight ratio of (M1) and (M2) in (M) to one another is in a range from 25:1 to 3:1, based in each case on the solids content of (M1) and (M2), and at least one of the components (M1), (M2), and optionally (M3) present in (M) has hydrolyzable silane groups, to a use of (M) as curing agent and adhesion promoter in a coating composition, to such a coating composition, and to methods for at least partly coating a substrate with a surfacer coat and for at least partly coating a substrate with a multicoat paint system. ## Claims ### Claim 1 A mixture (M) comprising at least two components (M1) and (M2), which are different from one another and comprise in each case independently of one another free and/or blocked isocyanate groups, and which mixture optionally comprises a further component (M3) different from (M1) and (M2); wherein component (M1) comprises at least one aliphatic polyisocyanate, wherein component (M1) has an NCO content in a range from 8 to 25 wt. % based on total weight of component (M1), component (M2) comprises at least one aliphatic polyisocyanate having polyether units, the relative weight ratio of components (M1) and (M2) in the mixture (M) to one another is in a range from 25:1 to 3:1, based in each case on the solids content of components (M1) and (M2), and wherein the mixture (M) is obtained by mixing components (M1) and (M2) and optional component (M3) and then partly reacting the isocyanate groups of components (M1) and (M2) with at least one hydrolyzable silane compound which has at least one functional group that is reactive toward isocyanate groups such that 5 to 30 mol % of all the isocyanate groups originally present in components (M1) and (M2) are reacted with the at least one hydrolyzable silane compound, such that each of components (M1) and (M2) contain a hydrolyzable silane group after reaction. ### Claim 2 (depends on 1) The mixture as claimed in claim 1, wherein the relative weight ratio of components (M1) and (M2) in the mixture (M) to one another is in a range from 20:1 to 5:1, based in each case on the solids content of components (M1) and (M2). ### Claim 3 (depends on 1) The mixture as claimed in claim 1, wherein a content of component (M2) in the mixture (M) is at least 5 wt %, based on the total solids content of the mixture (M). ### Claim 4 (depends on 1) The mixture as claimed in claim 1, wherein the mixture (M) is a solvent-containing dispersion at least of components (M1) and (M2) and also optionally (M3). ### Claim 5 (depends on 1) The mixture as claimed in claim 1, further comprising: at least one polymeric resin (N), different from components (M1) and (M2) and (M3) of the mixture (M), and at least one pigment (P). ### Claim 6 (depends on 5) The mixture as claimed in claim 5, wherein the mixture comprises components (M1), (M2), and (M3) in an amount in a range from 5 to 25 wt %, based on the total weight of the mixture. ### Claim 7 (depends on 5) The mixture as claimed in claim 5, wherein the polymeric resin (N) is selected from the group consisting of polyurethanes, polyesters, epoxy resins, poly(meth)acrylates, corresponding copolymers of these polymers, and mixtures thereof. ### Claim 8 (depends on 5) The mixture as claimed in claim 5, wherein the mixture comprises the at least one polymeric resin (N) in an amount in a range from 10 to 35 wt %, based on the total weight of the mixture, and comprises the at least one pigment (P) in an amount in a range from 5 to 40 wt %, based on the total weight of the mixture. ### Claim 9 (depends on 5) The mixture as claimed in claim 5, wherein the coating composition is suitable for at least partly coating a substrate, optionally coated at least partly at least with a primer coat, with a surfacer coat. ### Claim 10 (depends on 1) The mixture of claim 1, wherein the free and/or blocked isocyanate group is stable at a temperature of from 18 to 23° C. ### Claim 11 (depends on 1) The mixture as claimed in claim 1, Wherein the mixture is suitable as a curing agent and as an adhesion promoter. ### Claim 12 (depends on 1) The mixture as claimed in claim 1, wherein mixture (M) further comprises component (M3), and wherein component (M3) has hydrolyzable silane groups. ### Claim 13 (depends on 1) The mixture as claimed in claim 1, wherein 5 to 20 mol % of all the isocyanate groups originally present in components (M1) and (M2) are reacted with the at least one hydrolyzable silane compound. ### Claim 14 (depends on 1) The mixture as claimed in claim 1, wherein component (M1) comprises an oligomer and/or polymer of a diisocyanate, and is selected from the group consisting of urethanes, allophanates, biurets and isocyanurates. ### Claim 15 (depends on 1) The mixture as claimed in claim 1, wherein component (M2) comprises an oligomer and/or polymer of a diisocyanate, and is selected from the group consisting of urethanes, allophanates, biurets and isocyanurates. ### Claim 16 A mixture (M) comprising at least two components (M1) and (M2), which are different from one another and comprise in each case independently of one another free and/or blocked isocyanate groups, and which mixture optionally comprises a further component (M3) different from (M1) and (M2); wherein component (M1) comprises at least one aliphatic polyisocyanate, component (M2) comprises at least one aliphatic polyisocyanate having polyether units, wherein component (M2) contains no uretdione groups, the relative weight ratio of components (M1) and (M2) in the mixture (M) to one another is in a range from 25:1 to 3:1, based in each case on the solids content of components (M1) and (M2), and wherein the mixture (M) is obtained by mixing components (M1) and (M2) and optional component (M3) and then partly reacting the isocyanate groups of components (M1) and (M2) with at least one hydrolyzable silane compound which has at least one functional group that is reactive toward isocyanate groups such that 5 to 30 mol % of all the isocyanate groups originally present in components (M1) and (M2) are reacted with the at least one hydrolyzable silane compound, such that each of components (M1) and (M2) contain a hydrolyzable silane group after reaction. ### Claim 17 (depends on 5) A method for at least partly coating a substrate, optionally at least partly coated at least with a primer coat, with a surfacer coat, the method comprising at least partly contacting the substrate with the mixture as claimed in claim 5. ### Claim 18 (depends on 8) A method for at least partly coating a substrate with a multicoat paint system, the method comprising optionally at least partly applying a primer coat to a substrate, at least partly contacting the substrate, optionally at least partly coated at least with the primer coat, with the mixture as claimed in claim 8, thereby at least partly applying a surfacer coat to the substrate optionally coated at least partly at least with the primer coat, applying a basecoat film to the surfacer coat, and applying a clearcoat film to the basecoat film. ### Claim 19 (depends on 18) The method of claim 18, wherein an adhesion between the surfacer coat and the substrate is from 0 to 1.5, as measured by cross-cut testing after storage for a time of 16 hours at 40° C. ### Claim 20 (depends on 18) The method of claim 18, wherein an adhesion between the surfacer coat and the substrate is from 0.5 to 2, as measured by cross-cut testing after 3 hours after storage for 10 days under constant humidity conditions.