US4675358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating compositions
Assignee: PPG Industries Ohio Inc
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Filing: 1986-06-12
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Granted: 1987-06-23
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Expires: 2006-06-12
Abstract
Abstract The invention provides an aqueous coating composition which comprises a film forming polymer and a particulate metallic pigment characterized in that the composition contains as corrosion inhibition agent for the pigment a phosphatic material containing at least one acidic hydroxyl group or a salt thereof linked to a phosphorus atom and which has been obtained by the co-reaction of (i) an addition polymer carrying a functional hydroxyl group, (ii) a monohydric alcohol or phenol and (iii) a compound containing in the molecule the grouping: <IMAGE> or a compound equivalent in structure to such a grouping. Preferably, where the reactant (i) and/or (ii) contains a material having a terminal alkyl group containing more than 6 carbon atoms such a material provides less than 25% by weight of the combined weights of the reactants (i) and (ii), since we have found that the presence of such long chain terminal groups impairs the inter coat adhesion between a base coat of the composition of the invention and a subsequently applied translucent top coat.
Inventors
- 👤 Andrew Frangou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:22
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08; C09D5/10; C09D17/00; C09D17/004; C09D17/006; C09D5/38
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
87 words
An aqueous coating composition which comprises a film forming polymer and a particulate metallic pigment which composition contains as corrosion inhibition agent for the pigment a phosphatic material containing at least one acidic hydroxyl group linked to a phosphorus atom and which has been obtained by the co-reaction of (i) an addition polymer carrying a functional hydroxyl group, (ii) a monohydric compound selectd from an alcohol and a phenol and (iii) a compound selected from those containing in the molecule the grouping: ##STR3## anhydrides and salts thereof.
Claim 2
Dependent Claim
87 words
An aqueous coating composition which comprises a film forming polymer and a particulate metallic pigment which composition contains as corrosion inhibition agent for the pigment a phosphatic material containing at least one acidic hydroxyl group linked to a phosphorus atom and which has been obtained by the co-reaction of (i) an addition polymer carrying a functional hydroxyl group, (ii) a monohydric compound selectd from an alcohol and a phenol and (iii) a compound selected from those containing in the molecule the grouping: ##STR3## anhydrides and salts thereof.
Claim 3
Dependent Claim
20 words
A composition as claimed in claim 1 wherein the phosphatic material is used in the form of a salt thereof.
Claim 4
Dependent Claim
51 words
A composition as claimed in claim 1 wherein where the material selected from reactant (i) and (ii) contains a terminal alkyl group containing more than 6 carbon atoms, such a material is used in an amount of less than 25% by weight of the combined total of reactants (i) and (ii).
Claim 5
Dependent Claim
22 words
A composition as claimed in claim 1 wherein the reactant (iii) is selected from orthophosphoric acid, a salt thereof and phosphorus pentoxide.
Claim 6
Dependent Claim
22 words
A composition as claimed in claim 1 wherein the phosphatic material has an acid value of from 25 to 400 mg KOH/g.
Claim 7
Dependent Claim
54 words
A composition as claimed in claim 1 wherein the phosphatic material is present in an amount of from 0.2 to 5% by weight based on the metallic pigment, expressed as equivalents of orthophosphoric acid based on the acid value of the phosphatic material determined by titration with potassium hydroxide using a phenolphthalein end point.
Claim 8
Dependent Claim
215 words
A composition as claimed in claim 1 in the form of an aqueous dispersion comprising a sterically stabilised film forming polymer, a metallic flake pigment and as corrosion inhibition agent for the pigment the product of the co-reaction of: (i) a polymer selected from an addition homopolymer of an ethylenically unsaturated monomer carrying hydroxyl groups and from copolymers of such monomers with ethylenically unsaturated monomers not carrying hydroxyl groups; (ii) a monohydric compound of the formula HO--R n --X m --R' p wherein R is a straight or branched alkylene chain, X is a phenyl group, R' is hydrogen or a straight or branched alkyl group, n and m have values of 0 or 1 and the sum of n and m is at least 1 and p has a value of at least 1 when R' is hydrogen or alkyl or has a value of 0 when R' is alkyl; and (iii) a compound selected from orthophosphoric acid, a salt thereof and phosphorus pentoxide, not more than 25% w/w of the combined weights of reactants (i) and (ii) being a compound HO--R n --X m --R' p having R' as an alkyl group containing more than 6 carbon atoms or a reactant (i) having a terminal alkyl group containing more than 6 carbon atoms.
Claim 9
Dependent Claim
17 words
A composition as claimed in claim 7 wherein the said reactant (i) is a styrene/allyl alcohol copolymer.
Claim 10
Dependent Claim
13 words
A composition as claimed in claim 7 wherein said reactant (ii) is p-tert-amylphenol.
Claim 11
Dependent Claim
95 words
A pigment composition suitable for use in the composition of claim 1 which comprises a metallic pigment in admixture with as a corrosion inhibition agent for the pigment a phosphatic material containing at least one acidic hydroxyl group linked to a phosphorus atom or a salt thereof which phosphatic material has been obtained by the co-reaction of (i) an addition polymer carrying a functional hydroxyl group, (ii) a monohydric compound selected from an alcohol and a phenol and (iii) a compound selected from those containing in the molecule the grouping: ##STR4## anhydrides and salts thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-22 | 1990-12-22 | 1991-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-22 | 1994-12-22 | 1995-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-22 | 1998-12-22 | 1999-06-23 | $7700.00 | Window Closed / Lapsed |