EP0035316A2
Expired / Lapsed
EP
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Water-based coating compositions and the use thereof
Assignee: Syngenta Ltd
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Filing: 1981-01-13
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Granted: —
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Expires: 2001-01-13
Abstract
Abstract In the protection of ferrous substrates by application of a water-based paint composition followed by drying at ambient temperature susceptibility to flash rusting is reduced by the use of a paint composition having pH in the range from 3.0 to 6.5.
Inventors
- 👤 David Caldwell
- 👤 John Christopher Padget
- 👤 David Miller
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 17:10
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
A water-based paint composition capable of forming a protective coating by application to a ferrous substrate followed by drying at ambient temperature comprising (a) an aqueous latex or dispersion of a film-forming polymer consisting essentially of units derived from one or more mono-ethylenically unsaturated monomers containing a single vinyl or vinylidene group and (b) a corrosion-inhibiting pigment, characterised in that the pH of the composition is in the range from 3.0 to 6.5.
Claim 2
Dependent Claim
73 words
A water-based paint composition capable of forming a protective coating by application to a ferrous substrate followed by drying at ambient temperature comprising (a) an aqueous latex or dispersion of a film-forming polymer consisting essentially of units derived from one or more mono-ethylenically unsaturated monomers containing a single vinyl or vinylidene group and (b) a corrosion-inhibiting pigment, characterised in that the pH of the composition is in the range from 3.0 to 6.5.
Claim 3
Dependent Claim
19 words
A composition according to Claim 1, characterised .in that the pH is in the range from 4.0 to 5.5.
Claim 4
Dependent Claim
46 words
A composition according to Claim 1 or Claim 2 characterised in that the film-forming polymer is a copolymer of (i) vinyl chloride, (ii) vinylidene chloride and (iii) one or more alkyl acrylates or alkyl methacrylates having from 1 to 12 carbon atoms in the alkyl group.
Claim 5
Dependent Claim
23 words
A composition according to any of the preceding claims, characterised in that the corrosion-inhibiting pigment is a metal salt of an inorganic oxy-acid.
Claim 6
Dependent Claim
24 words
A composition according to Claim 4, characterised in that the metal of the salt is zinc, lead, magnesium, manganese, iron, calcium strontium or barium.
Claim 7
Dependent Claim
14 words
A composition according to Claim 5, characterised in that the salt is zinc phosphate.
Claim 8
Dependent Claim
31 words
A composition according to any of the preceding claims, characterised in that the composition also contains corrosion-inhibiting anions introduced in the form of the corresponding acid or a water-soluble salt thereof.
Claim 9
Dependent Claim
21 words
A composition according to any of the preceding claims, characterised in that the solids content is at least 25% by volume.
Claim 10
Independent Claim
62 words
A method of protecting a ferrous substrate which comprises (a) applying to the said substrate a coating of a water-based paint composition comprising an aqueous latex of a film-forming polymer and a corrosion-inhibiting pigment and (b) allowing the applied coating to dry at ambient temperature, characterised in that the paint composition is a composition as claimed in any of the preceding claims.
Claim 11
Dependent Claim
19 words
A method according to Claim 9 characterized in that the paint composition is applied by brush, spray or roller.
References Cited (Backward Citations)
No citation records indexed.
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