# US 8,541,059 B2 · Polyurethane coatings with improved interlayer adhesion > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,541,059 B2 - Document ID: US8541059B2 - Status: Granted - Kind: B2 - Application number: 11/852,531 - Filed: 2007-09-10 - Published: 2009-03-12 - Granted: 2013-09-24 - Earliest claimed: 2007-09-10 - Assignees: PRC-DeSoto International, Inc. - Applicants: Jak Aklian; Guangliang Tang; Siamanto Abrami - Inventors: Jak Aklian; Guangliang Tang; Siamanto Abrami - Web page: https://patentgrep.com/patent/US8541059B2 ## CPC - C08G 18/724: {Combination of aromatic polyisocyanates with (cyclo)aliphatic polyisocyanates} - C08G 18/4063: {Mixtures of compounds of group C08G18/62 with other macromolecular compounds} - C08G 18/7664: {containing alkylene polyphenyl groups} - C08G 18/792: {formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates} - C09D 175/04: Polyurethanes - Y10T 428/20: Patched hole or depression - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - 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) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Polyurethane coating compositions comprising a mixture of aromatic and aliphatic isocyanate, and a mixture of polyol resin are disclosed. Methods for treating an aged substrate are also disclosed. ## Claims ### Claim 1 A polyurethane coating composition comprising: a) an isocyanate component comprising: 70 wt % to 99 wt % of an aliphatic isocyanate, wherein the aliphatic isocyanate comprises polymeric hexamethylene diisocyanate; and 1 wt % to 30 wt % of an aromatic isocyanate, wherein the aromatic isocyanate comprises polymeric methylene diphenyl diisocyanate; wherein wt % is based on the total solids weight of the isocyanate component; and b) a polyol component comprising: 40 wt % to 80 wt % of a hard acrylic polyol; 10 wt % to 40 wt % of a soft acrylic polyol; and 5 wt % to 30 wt % of a polyester polyol; wherein wt % is based on the total solids weight of the polyol component; and wherein the coating composition cures at room temperature. ### Claim 2 (depends on 1) The coating composition of claim 1, wherein the composition further comprises an amine and/or metal compound catalyst. ### Claim 3 (depends on 2) The coating composition of claim 2, wherein the catalyst comprises 0.005 to 0.25 weight percent of the total solids weight of the coating composition. ### Claim 4 (depends on 1) The coating composition of claim 1, wherein the composition further comprises one or more solvents. ### Claim 5 (depends on 4) The coating composition of claim 4, wherein the one or more solvents comprise 20 to 60 weight percent of the total weight of the coating composition. ### Claim 6 (depends on 1) A method for treating an aged polyurethane surface comprising: applying the polyurethane coating composition of claim 1 to at least a portion of the aged polyurethane surface; drying the polyurethane coating composition; applying a second coating layer to at least a portion of the dried polyurethane coating composition; and curing the second coating layer. ### Claim 7 (depends on 6) The method of claim 6, wherein the aged polyurethane surface is not mechanically sanded or solvent stripped prior to application of the polyurethane coating composition. ### Claim 8 (depends on 6) The method of claim 6, wherein the dry film thickness of the dried polyurethane coating is 0.05 mils to 1 mil. ### Claim 9 (depends on 6) The method of claim 6, wherein the resulting treated aged polyurethane surface passes the Whirling Arm test according to BMS 10-11 specification. ### Claim 10 (depends on 6) The method of claim 6, wherein the second coating layer comprises a polyurethane coating. ### Claim 11 (depends on 6) The method of claim 6, wherein the aged polyurethane surface comprises an aged polyurethane coating. ### Claim 12 (depends on 1) A substrate comprising: an aged polyurethane surface; and a dried polyurethane coating prepared from the polyurethane coating composition of claim 1 applied to at least a portion of the aged polyurethane surface. ### Claim 13 (depends on 12) The substrate of claim 12, comprising a second polyurethane coating applied to at least a portion of the polyurethane coating. ### Claim 14 (depends on 12) The substrate of claim 12, wherein the aged polyurethane surface is not mechanically sanded or solvent stripped prior to application of the polyurethane coating composition. ### Claim 15 (depends on 12) The substrate of claim 12, wherein the dry film thickness of the dried polyurethane coating is 0.05 mils to 1 mil. ### Claim 16 (depends on 12) The substrate of claim 12, wherein the dry film thickness of the dried polyurethane coating is 0.2 mils to 1 mil. ### Claim 17 (depends on 12) The substrate of claim 12, wherein the aged polyurethane surface comprises an aged polyurethane coating. ### Claim 18 (depends on 12) The substrate of claim 12, further comprising a second coating layer wherein the second coating layer comprises a polyurethane coating.