EP0385880A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Coating composition exhibiting improved resistance to environmental attack
Assignee: Individual
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Filing: 1990-03-02
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Granted: —
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Expires: 2010-03-02
Abstract
Abstract A coating composition for the protection of substrates against environmental attack comprising, in weight percent based on the solvent-free weight of the composition, from about 8% to about 35% of at last one film forming polymer; from 0 to about 60% of a corrosion inhibiting agent such as metal chromates, metal phosphates, metal molybdates, particulate metallic zinc and/or particulate metallic aluminum; from 3% to about 6% of a plurality of grades of pyrogenic amorphous silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; from about 15% to about 55% of at least one crystalline silica having an oil absorption value of less than 20 measured by ASTM Standard Test D281-84; and 0 to 35%, based on the total weight of the composition, of at least one solvent compatible with the polymer. The compositions can be prepared in organic solvent-based, water-based, or solvent-free powder forms, and have utility as primer coatings for aircraft and aerospace vehicles, and for protection of metallic substrates against corrosion.
Inventors
- 👤 Ronald Richard Savin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 22:15
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
138 words
A coating composition for the protection of substrates against environmental attack, comprising, in weight percent based on the dry weight of the composition: from about 8% to about 35% of at least one film-forming polymer; 0 to about 60% of a corrosion inhibiting agent selected from the group consisting of metal chromates, metal phosphates, metal molybdates, particulate metallic zinc, particulate metallic aluminum, and mixtures thereof; from 3% to about 6% of a plurality of grades of pyrogenic amorphous silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; from about 15% to about 55% of at least one crystalline silica having an oil absorption value less than 20 measured by ASTM Standard Test D281-84; and 0 to 35%, based on the total weight of the composition, of at least one solvent compatible with said polymer.
Claim 2
Dependent Claim
138 words
A coating composition for the protection of substrates against environmental attack, comprising, in weight percent based on the dry weight of the composition: from about 8% to about 35% of at least one film-forming polymer; 0 to about 60% of a corrosion inhibiting agent selected from the group consisting of metal chromates, metal phosphates, metal molybdates, particulate metallic zinc, particulate metallic aluminum, and mixtures thereof; from 3% to about 6% of a plurality of grades of pyrogenic amorphous silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; from about 15% to about 55% of at least one crystalline silica having an oil absorption value less than 20 measured by ASTM Standard Test D281-84; and 0 to 35%, based on the total weight of the composition, of at least one solvent compatible with said polymer.
Claim 3
Dependent Claim
27 words
The composition of claim 1, wherein said polymer is selected from the group consisting of epoxy, phenoxy, urethane, vinyl chloride, acrylic, polyester, alkyd resins, and mixtures thereof.
Claim 4
Dependent Claim
39 words
The composition of claim 1, wherein said film-forming polymer is an epoxy resin having an epoxide value of about 250 to 2500, and including from about 5% to about 30% of a cross linking agent for said epoxy resin.
Claim 5
Dependent Claim
36 words
The composition of claim 3, wherein said solvent is selected from the group consisting of ketones, alcohols, esters, aromatic organic compounds, and mixtures thereof, in an amount less than 340 grams per liter of said composition.
Claim 6
Dependent Claim
163 words
A coating composition for the protection of substrates against environmental attack, comprising, in weight percent based on the dry weight of the composition: from about 10% to about 35% of a film-forming polymer which is liquid at room temperature in the presence of not more than 25% by weight solvents; up to about 25% of a corrosion inhibiting agent selected from the group consisting of metal chromates, metal phosphates, metal molybdates, particulate metallic aluminum, and mixtures thereof; from 3% to about 6% of a plurality of grades of amorphous pyrogenic silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; from about 20% to about 50% of a crystalline silica having an oil absorption value of less than 20 measured by ASTM standard test D281-84; and not greater than 25%, based on the total weight of the composition, of at least one solvent compatible with said polymer, said composition having a viscosity suitable for application of coatings by conventional equipment.
Claim 7
Dependent Claim
163 words
A coating composition for the protection of substrates against environmental attack, comprising, in weight percent based on the dry weight of the composition: from about 10% to about 35% of a film-forming polymer which is liquid at room temperature in the presence of not more than 25% by weight solvents; up to about 25% of a corrosion inhibiting agent selected from the group consisting of metal chromates, metal phosphates, metal molybdates, particulate metallic aluminum, and mixtures thereof; from 3% to about 6% of a plurality of grades of amorphous pyrogenic silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; from about 20% to about 50% of a crystalline silica having an oil absorption value of less than 20 measured by ASTM standard test D281-84; and not greater than 25%, based on the total weight of the composition, of at least one solvent compatible with said polymer, said composition having a viscosity suitable for application of coatings by conventional equipment.
Claim 8
Dependent Claim
22 words
The composition of claim 5, wherein said film-forming polymer is an epoxy, phenoxy, urethane, vinyl chloride, acrylic, polyester, or alkyd type resin.
Claim 9
Dependent Claim
38 words
The composition of claim 5, wherein said corrosion inhibiting agent includes a chromate of at least one of zinc, strontium and barium, and zinc phosphate, in a total amount ranging from about 10% to about 20% by weight.
Claim 10
Dependent Claim
32 words
The composition of claim 5, wherein said film-forming polymer is a liquid epoxy resin, and including from about 5% to about 30% by weight of a crosslinking agent for said epoxy resin.
Claim 11
Dependent Claim
36 words
The composition of claim 8, wherein said solvent is selected from the group consisting of ketones, alcohols, esters, aromatic organic compounds, and mixtures thereof, in an amount less than 340 grams per liter of said composition.
Claim 12
Dependent Claim
29 words
The composition of claim 5, wherein said film-forming polymer is a polyester, and including about 10% to about 20% by weight of a polyisocyanate crosslinking agent for said polymer.
Claim 13
Dependent Claim
179 words
A two component coating composition as claimed in claim 5, said composition after admixture having a viscosity suitable for deposition of coatings by conventional equipment, comprising, in weight percent based on the dry weight of the composition after admixture: from about 10% to about 30% of a film-forming epoxy polymer, said polymer being liquid at room temperature; from about 5% to about 30% of a crosslinking agent for said epoxy polymer; up to about 20% of a corrosion inhibiting agent selected from the group consisting of metal chromates, metal phosphates, metal molybdates, particulate metallic aluminum, and mixtures thereof; from 3% to about 6% of a plurality of grades of amorphous pyrogenic silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; from about 20% to about 50% of a crystalline silica having an oil absorption value of less than 20 measured by ASTM standard test D281-84; and from about 10% to about 25%, based on the total weight of the composition, of at least one organic solvent compatible with said epoxy polymer and said crosslinking agent.
Claim 14
Dependent Claim
31 words
The composition of claim 11, including up to 2% by weight of a coupling agent selected from the group consisting of silanes, organo-silicon compounds having an epoxy group, and mixtures thereof.
Claim 15
Dependent Claim
37 words
The composition of claim 11, including from about 0.1% to about 10% by weight, based on the weight of said epoxy polymer, of a catalyst to accelerate the reaction between said epoxy polymer and said crosslinking agent.
Claim 16
Dependent Claim
42 words
The composition of claim 11, wherein said at least one solvent is selected from the group consisting of ketones, alcohols, esters, aromatic organic compounds, and mixtures thereof, in a total amount less than 340 grams per liter of said composition after admixture.
Claim 17
Dependent Claim
29 words
The composition of claim 11, wherein said crosslinking agent is a hardener selected from the group consisting of aliphatic polyamides, aromatic polyamides, aliphatic polyamines, aromatic polyamines, and mixtures thereof.
Claim 18
Dependent Claim
183 words
A two component coating composition as claimed in claim 5, said composition after admixture having a viscosity suitable for deposition of coatings by conventional equipment, comprising, in weight percent based on the dry weight of the composition after admixture: from about 10% to about 30% of a film forming polyol-containing polyester; from about 7% to about 25% of an isocyanate polymer as a crosslinking agent, said polyester and said polymer being liquid at room temperature in the presence of not more than 25% by weight solvents; up to about 25% of a corrosion inhibiting agent selected from the group consisting of metal chromates, metal phosphates, metal molybdates, particulate metallic aluminum, and mixtures thereof; from 3% to about 6% of a plurality of grades of amorphous pyrogenic silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; from about 20% to about 50% of a crystalline silica having an oil absorption value of less than 20 measured by ASTM standard test D281-84; and not greater than 25% of at least one organic solvent compatible with said polyester and said isocyanate polymer.
Claim 19
Dependent Claim
42 words
The composition of claim 16, wherein said at least one solvent is selected from the group consisting of ketones, alcohols, esters, aromatic organic compounds, and mixtures thereof, in a total amount less than 340 grams per liter of said composition after admixture.
Claim 20
Dependent Claim
166 words
A two component zinc-rich coating composition for the protection of metallic substrates against environmental attack comprising, in weight percent based on the dry weight of the composition after admixture: from about 8% to about 25% of a film-forming polymer selected from the group consisting of epoxy resins having an epoxide value of about 250 to 2500, vinyl chloride resins copolymerized with polyisocyanates, vinyl chloride resins copolymerized with melamines, and mixtures thereof; from about 25% to about 60% particulate metallic zinc as a corrosion inhibiting agent; from about 3% to about 6% of a plurality of grades of pyrogenic amorphous silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; from about 20% to about 30% of a crystalline silica having an oil absorption value of less than 20 measured by ASTM Standard Test D281-84; from 0 to about 30% of a crosslinking agent for said polymer; and not more than 25% organic solvents, based on the total weight of the composition after admixture.
Claim 21
Dependent Claim
166 words
A two component zinc-rich coating composition for the protection of metallic substrates against environmental attack comprising, in weight percent based on the dry weight of the composition after admixture: from about 8% to about 25% of a film-forming polymer selected from the group consisting of epoxy resins having an epoxide value of about 250 to 2500, vinyl chloride resins copolymerized with polyisocyanates, vinyl chloride resins copolymerized with melamines, and mixtures thereof; from about 25% to about 60% particulate metallic zinc as a corrosion inhibiting agent; from about 3% to about 6% of a plurality of grades of pyrogenic amorphous silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; from about 20% to about 30% of a crystalline silica having an oil absorption value of less than 20 measured by ASTM Standard Test D281-84; from 0 to about 30% of a crosslinking agent for said polymer; and not more than 25% organic solvents, based on the total weight of the composition after admixture.
Claim 22
Dependent Claim
158 words
The composition of claim 18, comprising, in weight percent based on dry weight after admixture: from about 8% to about 25% of a solid epoxy resin having an epoxide value of about 400 to about 600; from about 30% to about 60% particulate metallic zinc; from 3% to about 5% of a plurality of grades of pyrogenic amorphous silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; from about 20% to about 30% of a crystalline silica having an oil absorption value less than 20 measured by ASTM Standard Test D281-84; from about 7% to about 25% of a polyamide or polyamine crosslinking agent for said epoxy resin; up to about 1% anti-foaming and wetting agents; up to about 1% suspension agent; and from about 10% to about 25%, based on the total weight of the composition, of organic solvents selected from the group consisting of ketones, alcohols, esters, aromatic compounds, and mixtures thereof.
Claim 23
Dependent Claim
143 words
A one component zinc-rich coating composition for the protection of metallic substrates against environmental attack, comprising, in weight percent based on the dry weight of the composition: from about 10% to about 25% of a solid linear epoxy resin; from about 30% to about 60% particulate metallic zinc; from 3% to about 5% of a plurality of grades of pyrogenic amorphous silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; from about 20% to about 40% of a crystalline silica having an oil absorption value less than 20 measured by ASTM Standard Test D281-84; up to about 1% of a suspension agent; and from about 10% to about 35%, based on the total weight of the composition, of organic solvents selected from the group consisting of methylethylketone, methylpropylketone, methylisobutylketone, methylamylketone, butanol, isopropanol, butyl acetate, amyl acetate, and mixtures thereof.
Claim 24
Dependent Claim
143 words
A one component zinc-rich coating composition for the protection of metallic substrates against environmental attack, comprising, in weight percent based on the dry weight of the composition: from about 10% to about 25% of a solid linear epoxy resin; from about 30% to about 60% particulate metallic zinc; from 3% to about 5% of a plurality of grades of pyrogenic amorphous silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; from about 20% to about 40% of a crystalline silica having an oil absorption value less than 20 measured by ASTM Standard Test D281-84; up to about 1% of a suspension agent; and from about 10% to about 35%, based on the total weight of the composition, of organic solvents selected from the group consisting of methylethylketone, methylpropylketone, methylisobutylketone, methylamylketone, butanol, isopropanol, butyl acetate, amyl acetate, and mixtures thereof.
Claim 25
Dependent Claim
127 words
A zinc-rich coating composition in powder form for the protection of ferrous metal substrates against environmental attack, comprising, in weight percent based on the total weight of the composition: from about 10% to about 30% of a particulate epoxy resin having a melting point not greater than about 250° C; from about 25% to about 55% particulate metallic zinc having a mean particle size between about 2 and about 10 microns as a corrosion inhibiting agent; from 3% to about 6% of a plurality of grades of pyrogenic amorphous silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; and from about 20% to about 30% of a crystalline silica having an oil absorption value less than 20 measured by ASTM Standard Test D281-84.
Claim 26
Dependent Claim
127 words
A zinc-rich coating composition in powder form for the protection of ferrous metal substrates against environmental attack, comprising, in weight percent based on the total weight of the composition: from about 10% to about 30% of a particulate epoxy resin having a melting point not greater than about 250° C; from about 25% to about 55% particulate metallic zinc having a mean particle size between about 2 and about 10 microns as a corrosion inhibiting agent; from 3% to about 6% of a plurality of grades of pyrogenic amorphous silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; and from about 20% to about 30% of a crystalline silica having an oil absorption value less than 20 measured by ASTM Standard Test D281-84.
Claim 27
Dependent Claim
147 words
The composition of claim 21, comprising, in weight percent based on the total weight of the composition: from about 10% to about 25% of at least one particulate epoxy resin having epoxide values ranging from about 800 to about 2200; up to about 5% of a flow control epoxy resin concentrate; up to about 6% of a thixotropic epoxy resin concentrate; from about 30% to about 55% particulate metallic zinc having a mean particle size between about 3 and about 6 microns; from 3% to about 5% of a plurality of grades of pyrogenic amorphous silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; from about 20% to about 30% of a crystalline silica having an oil absorption value less than 20 measured by ASTM Standard Test D281-84; and up to about 2% of a catalytic type curing agent for said epoxy resin.
Claim 28
Dependent Claim
159 words
A two component water-based zinc-rich coating composition for the protection of metallic substrates against environmental attack comprising, in weight percent based on the dry weight of the composition after admixture: from about 10% to about 30% of an epoxy polymer which is liquid at room temperature; from about 30% to about 60% particulate metallic zinc; from about 20% to about 30% crystalline silica having an oil absorption value less than 20 measured by ASTM Standard Test D281-84; from 3% to about 5% of a plurality of grades of pyrogenic amorphous silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; from about 5% to about 20% of a water soluble polyamide crosslinking agent for said epoxy polymer; and, based on the total weight of the composition: from about 5% to about 15% of a water soluble glycol ether; up to about 5% of a water soluble alkyl ether; and from about 10% to about 25% water.
Claim 29
Dependent Claim
159 words
A two component water-based zinc-rich coating composition for the protection of metallic substrates against environmental attack comprising, in weight percent based on the dry weight of the composition after admixture: from about 10% to about 30% of an epoxy polymer which is liquid at room temperature; from about 30% to about 60% particulate metallic zinc; from about 20% to about 30% crystalline silica having an oil absorption value less than 20 measured by ASTM Standard Test D281-84; from 3% to about 5% of a plurality of grades of pyrogenic amorphous silicas having average particle sizes ranging from about 0.007 to about 0.04 micron; from about 5% to about 20% of a water soluble polyamide crosslinking agent for said epoxy polymer; and, based on the total weight of the composition: from about 5% to about 15% of a water soluble glycol ether; up to about 5% of a water soluble alkyl ether; and from about 10% to about 25% water.
Claim 30
Dependent Claim
65 words
The composition of claim 1, 5, 18, 20, 21, or 23, wherein said plurality of grades of pyrogenic amorphous silicas comprises at least four grades, with at least about one-third by weight of said silicas having an average particle size of about 0.007 to about 0.008 micron and the remainder being a mixture having average particle sizes ranging from about 0.014 to about 0.04 micron.
References Cited (Backward Citations)
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