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Stabilized coating compositions containing isothiazolone

A technology of isothiazolone and composition, which is applied in the field of water-based anti-mildew coating composition, and can solve problems such as degradation and bad smell

Inactive Publication Date: 2004-01-14
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some paint compositions containing zinc oxide at a pH above 9.5, the zinc oxide may not be sufficient to stabilize the isothiazolone component, and the dry paint film may change, especially under wet or warm conditions. Degradation of thiazolones produces an unpleasant odor
[0004] The problem to be solved by the present invention is to overcome the shortcomings of existing paint formulations that the isothiazolone microbicide component will degrade even if there is zinc salt under the condition of pH value higher than 9.5

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation procedure for various simulated coating formulations (used in Examples 2-4) is described below. For the experiment of Example 2, about 0.3 grams of 3-isothiazolone microbicide (Skane TM M-8 antifungal agent) (45-47% 2-n-octyl-3-isothiazolone (OIT), 48-50% propylene glycol, 3-5% water) is added to the film-forming polymer emulsion containing about 70 grams and 0.2-0.3 grams of pH adjuster amine compound in the simulated paint formulation. For Examples 3 and 4, about 0.2 grams of 3-isothiazolone microbicide (Skane TM M-8 antifungal agent) (45-47% 2-n-octyl-3-isothiazolone (OIT), 48-50% propylene glycol, 3-5% water) is added to the film-forming polymer emulsion containing about 50 grams , 0.1-0.3 gram of pH regulator amine compound, 0.0-0.11 gram of zinc octanoate (18% aqueous solution) and 0.0-0.017 gram of copper nitrate (such as Cu(NO 3 ) 2 1.5H 2 O or 23% aqueous solution) in the simulated paint formulation. The formulated samples were then plac...

Embodiment 2

[0039] Table 1 summarizes the effect of pH on OIT stability in simulated paint formulations containing no copper or zinc ions (no zinc octoate or copper salt in all samples). The pH of all samples was adjusted with 10% HCl or 10% NaOH to lower or raise the pH of the samples, respectively. The pH of samples 2-A-1 and 2-B-1 dropped to 9.6 after three days. At pH values ​​below 9.5, all formulations were stable with respect to OIT content, (>90% retention after about 2 months); at pH values ​​above 9.5, OIT was stable during the first few days Sexuality declines rapidly (<75% retention after three days).

[0040] Table 1

[0041] sample

Embodiment 3

[0043] Table 3 summarizes the effect of zinc ions (such as zinc octoate) or copper ions (such as copper nitrate) on the stability of OIT in simulated paint formulations at high pH (9.8-9.9). All samples were adjusted to the desired final pH with 10% NaOH. Containing only zinc ions (Zn 2+ = 400ppm) in the formulation, the stability of OIT decreased rapidly in the first few days (retention 2+ = 50 ppm) was added to this formulation, the OIT stability was greatly improved (>90% retention after two months), even at very high pH.

[0044] Table 2

[0045] sample

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PUM

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Abstract

High pH aqueous coating compositions containing 3-isothiazolone microbicide that have been stabilized against the degradation of the 3-isothiazolone by the addition of low levels of copper ion are disclosed. In particular, aqueous paint compositions containing pH-adjusting amine compounds, where the pH is above 9.5, are effectively stabilized when 1 to 200 ppm of copper ion is added to the paint composition before the 3-isothiazolone is combined with other paint components or if copper ion is added together with the 3-isothiazolone to the remaining paint components or if the 3-isothiazolone is added no more than 1 hour before copper ion is added to the composition.

Description

technical field [0001] The present invention relates to water-based antifungal coating compositions containing isothiazolone compounds. In particular, the present invention provides stable, odor-free coating compositions (especially lacquers) which are aqueous compositions containing isothiazolone microbicides and have a pH value above 9.5. Background technique [0002] Isothiazolones are well known as fungicides for use in film-forming compositions, but are generally unstable without the addition of stabilizers, and their stability varies with the particular isothiazolone and the environment. Nitrates, including copper nitrate, are known stabilizers for isothiazolones in water-based paint formulations (see US Patents 3,870,795 and 4,067,878). [0003] The use of various copper and zinc salts as stabilizers for isothiazolones in paint compositions is disclosed in US Patents 5,073,582 and 5,208,272. Generally, when the paint composition contains zinc oxide, it is not necess...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/04A01N43/80C08K5/00C08K5/46C08K5/47C09D5/00C09D7/12C09D125/04C09D127/06C09D131/04C09D133/00C09D133/04
CPCC09D133/04C08K2003/085C08K5/47C08K5/46C08K5/0058
Inventor T·戈什
Owner ROHM & HAAS CO