Formaldehyde stabilized coating compositions
AssigneeRohm and Haas Company
InventorsStanley A. Greenfield, John A. Dupont
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Abstract
Coating compositions which contain a mildew-controlling amount of an isothiazolone are stabilized against chemical decomposition of the isothiazolone by the addition of formaldehyde or a compound which releases formaldehyde under basic conditions.
Claims21
In a coating composition which comprises a film-forming material, carrier, and a 3-isothiazolone, the improvement wherein the composition further comprises a stabilizing amount of formaldehyde.
A method of stabilizing a coating composition which comprises a film-forming material, carrier, and a 3-isothiazolone against chemical decomposition of the isothiazolone which comprises incorporating into the composition a stabilizing amount of formaldehyde or a compound which releases formaldehyde under basic conditions.
A coating composition which comprises a film-forming acrylic emulsion polymer, water as a carrier, an isothiazolone of the formula ##STR13## wherein Y is a hydrogen atom, a (C.sub.1 -C.sub.18) alkyl group, a (C.sub.6 -C.sub.10)aryl group, or a (C.sub.7 -C.sub.10)aralkyl group;
- R is a hydrogen atom, a halogen atom, or a (C.sub.1 -C.sub.4) alkyl group, and
- R' is a hydrogen atom, a halogen atom, or a (C.sub.1 -C.sub.4)alkyl group,
- and formaldehyde in an amount equivalent to about 0.5 to about 20 pounds of 37% aqueous formaldehyde per 100 gallons of the composition, wherein the composition is neutralized to a pH of about 6.0 to about 9.2 with about 0.25 to about 10 pounds per 100 gallons of ammonia or an organic amine and wherein the isothiazolone is present in an amount of about 0.1 to about 20 pounds per 100 gallons of the composition.
Dependencies are inferred from the claim text.