# US 9,434,855 B2 · Polymer in multicoat color and/or effect paint systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,434,855 B2 - Document ID: US9434855B2 - Status: Granted - Kind: B2 - Application number: 14/012,198 - Filed: 2013-08-28 - Published: 2014-03-06 - Granted: 2016-09-06 - Earliest claimed: 2012-08-28 - Assignees: BASF Coatings GmbH - Applicants: BASF Coatings GmbH - Inventors: Peter Hoffmann; Bernhard Steinmetz; Jorn Lavalaye; Hardy Reuter - Web page: https://patentgrep.com/patent/US9434855B2 ## CPC - C09D 175/04: Polyurethanes - B05D 7/534: {the first layer being let to dry at least partially before applying the second layer (B05D7/538 takes precedence)} - C08G 18/4252: {derived from polyols containing polyether groups and polycarboxylic acids} - C08G 63/00: Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule (polyester-amides C08G69/44; polyester-imides C08G73/16) - C08G 63/676: in which at least one of the two components contains aliphatic unsaturation - C09D 167/00: Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain (based on polyester-amides C09D177/12; based on polyester-imides C09D179/08); Coating compositions based on derivatives of such polymers - C09D 167/08: Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids - C09D 175/06: from polyesters - Y10T 428/31551: Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.] - 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) - B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02) - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Disclosed is a polymer which is prepared by reacting (a) dimer fatty acids with (b) at least one polyether of general structural formula (I) where R is a C3 to C6 alkylene radical and n is selected accordingly such that said polyether has a number-average molecular weight of 450 to 2200 g/mol, components (a) and (b) are used in a molar ratio of 0.7/2.3 to 1.3/1.7, and the resulting polymer has a number-average molecular weight of 1500 to 5000 g/mol and an acid number <10 mg KOH/g. Also disclosed is a pigmented aqueous basecoat material which comprises this polymer, and the use of said polymer in pigmented aqueous basecoat materials. It further relates to a method for producing multicoat paint systems, and also to the multicoat paint systems producible by means of said method. Moreover, the present invention relates to the refinish of defect areas on multicoat paint systems. ## Claims ### Claim 1 A polymer comprising the reaction product of (a) dimer fatty acids with (b) at least one polyether of general structural formula (I) where R is a C4 to C6 alkylene radical and n is selected accordingly such that said polyether has a number-average molecular weight of 450 to 2200 g/mol, components (a) and (b) are used in a molar ratio of 0.7/2.3 to 1.3/1.7, and the resulting polymer has a number-average molecular weight of 1500 to 5000 g/mol and an acid number of <10 mg KOH/g, wherein when the polymer is incorporated into a pigmented aqueous basecoat material, the pigmented aqueous basecoat material is effective to form a film upon application to a substrate. ### Claim 2 (depends on 1) The polymer of claim 1, wherein the dimer fatty acids used comprise at least 90% by weight of dimeric molecules, less than 5% by weight of trimeric molecules, and less than 5% by weight of monomeric molecules and other by-products. ### Claim 3 (depends on 1) The polymer of claim 1, wherein the dimer fatty acid used is prepared from linolenic, linoleic and/or oleic acid and comprises at least 98% by weight of dimeric molecules, less than 1.5% by weight of trimeric molecules, and less than 0. 5% by weight of monomeric molecules and other by-products, and has an iodine number of <10 g/100 g. ### Claim 4 (depends on 1) The polymer of claim 1, wherein the polyether of general structural formula (I) is polytetrahydrofuran and comprises a number-average molecular weight of 800 to 1200 g/mol. ### Claim 5 (depends on 1) The polymer of claim 1, wherein components (a) and (b) are used in a molar ratio of 0.9/2.1 to 1.1/1.9. ### Claim 6 (depends on 1) The polymer of claim 1, wherein the resulting polymer has a number-average molecular weight of 3000 to 4000 g/mol. ### Claim 7 (depends on 1) The polymer of claim 1, wherein the resulting polymer has an acid number of <5 mg KOH/g. ### Claim 8 A pigmented aqueous basecoat material comprising at least one polymer comprising the reaction product of (a) dimer fatty acids with (b) at least one polyether of general structural formula (I) where R is a C3 to C6 alkylene radical and n is selected accordingly such that said polyether has a number-average molecular weight of 450 to 2200 g/mol, components (a) and (b) are used in a molar ratio of 0.7/2.3 to 1.3/1.7, and the resulting polymer has a number-average molecular weight of 1500 to 5000 g/mol and an acid number of <10 mg KOH/g, wherein the pigmented aqueous basecoat material is effective to form a film upon application to a substrate. ### Claim 9 (depends on 8) The pigmented aqueous basecoat material of claim 8, wherein the at least one polymer is present in an amount of 0.1% to 30% by weights, based on the total weight of the pigmented aqueous basecoat material. ### Claim 10 (depends on 8) The pigmented aqueous basecoat material of claim 8, further comprising, as a further binder, at least one polyurethane resin. ### Claim 11 (depends on 8) The pigmented aqueous basecoat material of claim 8, wherein the polyether general structural formula (I) is polypropylene glycol or polytetrahydrofuran and comprises a number-average molecular weights of 800 to 1200 g/mol. ### Claim 12 A method of promoting adhesion, comprising adding a polymer to a pigmented aqueous basecoat material, the polymer comprising the reaction product of (a) dimer fatty acids with (b) at least one polyether of general structural formula (I) where R is a C3 to C6 alkylene radical and n is selected accordingly such that said polyether has a number-average molecular weight of 450 to 2200 g/mol, components (a) and (b) are used in a molar ratio of 0.7/2.3 to 1.3/1.7, and the resulting polymer has a number-average molecular weight of 1500 to 5000 g/mol and an acid number of <10 mg KOH/g, wherein when the polymer is incorporated into the pigmented aqueous basecoat material, the pigmented aqueous basecoat material is effective to form a film upon application to a substrate. ### Claim 13 (depends on 12) The method of claim 12, wherein the polyether of general structural formula (I) is polypropylene glycol or polytetrahhydrofuran and comprises a number-average molecular weight of 800 to 1200 g/mol. ### Claim 14 (depends on 8) A method for producing a multicoat paint system, comprising (1) applying the pigmented aqueous basecoat material of claim 8 to a substrate, (2) forming a basecoat film, (3) applying a clearcoat material to the basecoat film, and subsequently (4) curing the basecoat film together with the clearcoat film. ### Claim 15 (depends on 14) The method of claim 14, wherein said substrate from stage (1) comprises a multicoat paint system which has defect areas. ### Claim 16 (depends on 14) A multicoat paint system made by the method of claim 14. ### Claim 17 A pigmented aqueous basecoat material comprising at least one polymer comprising the reaction product of (a) dimer fatty acids consisting of at least 90% by weight of dimeric molecules and less than 5% by weight of trimeric molecules with (b) at least one polyether of general structural formula (I) where R is a C3 to C6 alkylene radical and n is selected accordingly such that said polyether has a number-average molecular weight of 450 to 2200 g/mol, components (a) and (b) are used in a molar ratio of 0.7/2.3 to 1.3/1.7, and the resulting polymer has a number-average molecular weight of 1500 to 5000 g/mol and an acid number of <10 mg KOH/g, wherein the pigmented aqueous basecoat material is effective to form a film upon application to a substrate.