# US 8,540,814 B2 · Coatings for corrosion susceptible substrates > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,540,814 B2 - Document ID: US8540814B2 - Status: Granted - Kind: B2 - Application number: 12/605,141 - Filed: 2009-10-23 - Published: 2010-05-13 - Granted: 2013-09-24 - Earliest claimed: 2008-10-24 - Assignees: Trent University - Applicants: Andrew James Vreugdenhil; Thomas Alan Singleton - Inventors: Andrew James Vreugdenhil; Thomas Alan Singleton - Web page: https://patentgrep.com/patent/US8540814B2 ## CPC - C09D 183/06: containing silicon bound to oxygen-containing groups (C09D183/12 takes precedence) - B05D 5/00: Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures - B05D 7/14: to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23) - B05D 2202/10: based on Fe - B05D 2202/25: based on Al - Y10T 428/31529: Next to metal - Y10T 428/31663: As siloxane, silicone or silane - 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) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Superior protective coatings for corrosion susceptible substrates are provided by lower alkoxysilane-epoxy polymeric compounds produced by sol-gel polymerization and cross-linked by reaction with an aromatic diamine cross-linking agent such as a phenylenediamine. ## Claims ### Claim 1 A coating composition for application to a metal substrate for protection against corrosion, the composition comprising an aqueous dispersion of at least one water dispersible lower alkoxysilane carrying an epoxy group, and a water dispersible aromatic diamine reactive curing agent for coating onto a corrosion-susceptible substrate and curing in situ on the substrate to form a corrosion resistant protective coating thereon. ### Claim 2 (depends on 1) The coating composition of claim 1, wherein the aromatic diamine curing agent is a benzene diamine. ### Claim 3 (depends on 2) The coating composition of claim 2, wherein the benzene diamine is at least one phenylenediamine. ### Claim 4 (depends on 3) The coating composition of claim 3, wherein the phenylenediamine is ortho-phenylenediamine, meta-phenylenediamine or para-phenylenediamine. ### Claim 5 (depends on 1) The coating composition of claim 1, wherein the aromatic diamine curing agent is a mixture of at least two of ortho-phenylenediamine, meta-phenylenediamine and para-phenylenediamine. ### Claim 6 (depends on 1) The coating composition of claim 1, wherein the at least one lower alkoxysilane comprises a combination of an epoxy group carrying silane and a second lower alkoxysilane. ### Claim 7 (depends on 1) The coating composition of claim 1, wherein the lower alkoxysilane carrying an epoxy group is 3-glycidoxypropyltrimethoxysilane, 3-glycidyloxypropyltriethoxysilane, 3-glycidyloxypropyltrichlorosilane, diethoxy(3-(glycidyloxy)propyl)methylsilane, dichloro(3-(glycidyloxy)propyl)methylsilane, 6-glycidyloxyhexyltriethoxysilane, or 6-glycidyloxyhexyltrimethoxysilane. ### Claim 8 (depends on 7) The coating composition of claim 7, wherein the lower alkoxysilane carrying an epoxy group is 3-glycidyloxypropyl trimethoxysilane. ### Claim 9 (depends on 6) The coating composition of claim 6, wherein the second lower alkoxysilane is tetraethoxysilane, tetramethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, aminopropyltrimethoxysilane, aminopropyltriethoxysilane, methylaminopropyldimethoxysilane, methylaminopropyldiethoxysilane, dimethylaminopropylmethoxysilane or dimethylaminopropylethoxysilane. ### Claim 10 (depends on 9) The coating composition of claim 9, wherein the second lower alkoxysilane is tetraethoxysilane or tetramethoxysilane. ### Claim 11 (depends on 1) The coating composition of claim 1, wherein the metal substrate is steel. ### Claim 12 (depends on 1) The coating composition of claim 1, wherein the metal substrate is aluminum or alloys thereof. ### Claim 13 A process of preparing a corrosion resistant protective coating on a corrosion susceptible substrate, which comprises forming an aqueous suspension of a lower alkoxysilane containing epoxy groups and an aromatic diamine reactive curing agent, applying said aqueous suspension to the substrate, and polymerizing and curing the lower alkoxysilane by sol-gel process to form a corrosion resistant protective coating on the substrate. ### Claim 14 (depends on 13) The process of claim 13, wherein the aromatic diamine curing agent is a benzene diamine. ### Claim 15 (depends on 14) The process of claim 14, wherein the benzene diamine is at least one phenylenediamine. ### Claim 16 (depends on 15) The process of claim 15, wherein the phenylenediamine is ortho-phenylenediamine, meta-phenylenediamine or para-phenylenediamine. ### Claim 17 (depends on 15) The process of claim 15, wherein the aromatic diamine curing agent is a mixture of at least two of ortho-phenylenediamine, meta-phenylenediamine and para-phenylenediamine. ### Claim 18 (depends on 13) The process of claim 13, wherein the alkoxysilane polymer of the coating is a combination of an epoxy group carrying silane and a second lower alkoxysilane. ### Claim 19 (depends on 13) The process of claim 13, wherein the lower alkoxysilane carrying an epoxy group is 3-glycidoxypropyltrimethoxysilane, 3-glycidyloxypropyltriethoxysilane, 3-glycidyloxypropyltrichlorosilane, diethoxy(3-(glycidyloxy)propyl)methylsilane, dichloro(3-(glycidyloxy)propyl)methylsilane, 6-glycidyloxyhexyltriethoxysilane, or 6-glycidyloxyhexyltrimethoxysilane. ### Claim 20 (depends on 13) The process of claim 13, wherein the lower alkoxysilane carrying an epoxy group is 3-glycidyloxypropyl trimethoxysilane. ### Claim 21 (depends on 18) The process of claim 18, wherein the second lower alkoxysilane is tetraethoxysilane, tetramethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, aminopropyltrimethoxysilane, aminopropyltriethoxysilane, methylaminopropyldimethoxysilane, methylaminopropyldiethoxysilane, dimethylaminopropylmethoxysilane or dimethylaminopropylethoxysilane. ### Claim 22 (depends on 18) The process of claim 18, wherein the second lower alkoxysilane is tetraethoxysilane or tetramethoxysilane. ### Claim 23 (depends on 13) The process of claim 13, wherein the corrosion susceptible substrate is steel. ### Claim 24 (depends on 13) The process of claim 13, wherein the corrosion susceptible substrate is aluminum or alloys thereof. ### Claim 25 (depends on 13) The process of claim 13, wherein the aqueous suspension of the lower alkoxysilane containing epoxy groups has a water to silane ratio of from about 10:1 to about 25:1. ### Claim 26 (depends on 13) The process of claim 13, wherein the aqueous suspension of the lower alkoxysilane containing epoxy groups has a water to silane ratio of about 15:1. ### Claim 27 (depends on 13) The process of claim 13, wherein the process is conducted at about room temperature. ### Claim 28 A process of preparing a corrosion resistant protective coating on a corrosion susceptible substrate, which comprises applying to the corrosion susceptible substrate an aqueous suspension of a polymerized or polymerizable lower alkoxysilane containing epoxy groups, forming a coating on the corrosion susceptible substrate of said lower alkoxysilane and curing the polymer coating on the corrosion susceptible substrate by reaction with an aromatic diamine reactive curing agent. ### Claim 29 (depends on 28) The process of claim 28, wherein the aromatic diamine curing agent is a benzene diamine. ### Claim 30 (depends on 29) The process of claim 29, wherein the benzene diamine is at least one phenylenediamine. ### Claim 31 (depends on 29) The process of claim 29, wherein the phenylenediamine is ortho-phenylenediamine, meta-phenylenediamine or para-phenylenediamine. ### Claim 32 (depends on 28) The process of claim 28, wherein the aromatic diamine curing agent is a mixture of at least two of ortho-phenylenediamine, meta-phenylenediamine and para-phenylenediamine. ### Claim 33 (depends on 28) The process of claim 28, wherein the lower alkoxysilane carrying an epoxy group is 3-glycidoxypropyltrimethoxysilane, 3-glycidyloxypropyltriethoxysilane, 3-glycidyloxypropyltrichlorosilane, diethoxy(3-(glycidyloxy)propyl)methylsilane, dichloro(3-(glycidyloxy)propyl)methylsilane, 6-glycidyloxyhexyltriethoxysilane, or 6-glycidyloxyhexyltrimethoxysilane. ### Claim 34 (depends on 28) The process of claim 28, wherein the lower alkoxysilane carrying an epoxy group is 3-glycidyloxypropyl trimethoxysilane. ### Claim 35 (depends on 28) The process of claim 28, wherein the corrosion susceptible substrate is steel. ### Claim 36 (depends on 28) The process of claim 28 wherein the corrosion susceptible substrate is aluminum or alloys thereof. ### Claim 37 (depends on 28) The process of claim 28, wherein the aqueous suspension of the lower alkoxysilane containing epoxy groups has a water to silane ratio of from about 10:1 to about 25:1. ### Claim 38 (depends on 28) The process of claim 28, wherein the aqueous suspension of the lower alkoxysilane containing epoxy groups has a water to silane ratio of about 15:1. ### Claim 39 (depends on 28) The process of claim 28, wherein the process is conducted at about room temperature. ### Claim 40 (depends on 28) The process of claim 28, wherein the polymer curing reaction is conducted at about room temperature.