US4957658A
Expired / Lapsed
US
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Process and composition for providing reduced discoloration caused by the presence of pyrithione and ferric ion in water-based paints and paint bases
Assignee: Arch Chemicals Inc
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Filing: 1989-02-24
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Granted: 1990-09-18
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Expires: 2009-02-24
Abstract
Abstract This invention relates generally to paints and paint bases and, more specifically, to a process and composition for providing reduced discoloration of paints and paint bases containing a pyrithione and ferric ion.
Inventors
- 👤 Cheryl B. French
- 👤 Sigmund Breister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:16
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/0009; C07; C07D; C07D213/00; C07D213/02; C07D213/89; C09; C09D; C09D5/00; C09D5/02; C09D5/024; C09K; C09K15/00; C09K15/04; C09K15/32; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/38; C22B3/386; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
47 words
A process for reducing or inhibiting the formation of a blue discoloration in a water-based coating composition caused by the presence of ferric ion and sodium or zinc pyrithione in the composition which comprises adding thereto an alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid.
Claim 2
Dependent Claim
47 words
A process for reducing or inhibiting the formation of a blue discoloration in a water-based coating composition caused by the presence of ferric ion and sodium or zinc pyrithione in the composition which comprises adding thereto an alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid.
Claim 3
Dependent Claim
23 words
The process of claim 1 which additionally comprises adding to said coating composition composition an alkali metal salt of ethylene diamine tetraacetic acid.
Claim 4
Dependent Claim
37 words
The process of claim 1 wherein said alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid is selected from the group consisting of the sodium, potassium, calcium, and magnesium salts of 1-hydroxyethane-1,1-diphosphonic acid, and mixtures thereof.
Claim 5
Dependent Claim
50 words
The process of claim 1 wherein the amount of said alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid is between about 33 and about 75 weight percent based upon the total weight of said alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid plus said sodium pyrithione.
Claim 6
Dependent Claim
43 words
A water-based coating composition composition free of, or inhibited against, blue discoloration otherwise caused by the presence of ferric ion and sodium or zinc pyrithione therein comprising an aqueous sodium pyrithione and an alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid.
Claim 7
Dependent Claim
43 words
A water-based coating composition composition free of, or inhibited against, blue discoloration otherwise caused by the presence of ferric ion and sodium or zinc pyrithione therein comprising an aqueous sodium pyrithione and an alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid.
Claim 8
Dependent Claim
16 words
The composition of claim 5 which additionally contains an alkali metal salt of ethylenediamine tetraacetic acid.
Claim 9
Dependent Claim
37 words
The composition of claim 5 wherein said alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid is selected from the group consisting of the sodium, potassium, calcium, and magnesium salts of 1-hydroxyethane-1,1-diphosphonic acid, and mixtures thereof.
Claim 10
Dependent Claim
50 words
The composition of claim 5 wherein the amount of said alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid is between about 33 and about 75 weight percent based upon the total weight of said alkali metal or alkaline earth metal salt of 1-hydroxyethane-1,1-diphosphonic acid plus said sodium pyrithione.
Claim 11
Dependent Claim
33 words
The composition of claim 6 wherein said alkali metal salt of ethylenediamine tetraacetic acid is present in an amount of between 50 and 500 ppm based upon the total weight of the composition.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
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