Blends of encapsulated biocides

• US 20070215000A1
• Filed: 03/08/2007
• Published: 09/20/2007
• Est. Priority Date: 03/16/2006
• Status: Active Grant

• Current Assignee: Nutrition & Biosciences USA 2 LLC (International Flavors & Fragrances Incorporated)
• Original Assignee: Rohm and Haas Company (Dow, Inc.)
• Inventors: Schwartz, Curtis, Reybuck, Sarah E.
• Granted Patent: US 7,377,968 B2
• Time in Patent Office: Days
• US Class Current: 106/18.330
• CPC Class Codes: A01N 2300/00 Combinations or mixtures of active ingredients covered by classes A01N27/00 - A01N65/48 with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes A01N25/00 - A01N65/48
• CPC Class Codes: A01N 25/10 Macromolecular compounds
• CPC Class Codes: A01N 25/28 Microcapsules or nanocapsules
• CPC Class Codes: A01N 43/80 five-membered rings with one nitrogen atom and either one oxygen atom or one sulfur atom in positions 1,2
• CPC Class Codes: C09D 5/14 Paints containing biocides, e.g. fungicides, insecticides or pesticides C09D5/16 takes precedence
• CPC Class Codes: C09D 5/1606 characterised by the anti-fouling agent
• CPC Class Codes: C09D 5/1625 organic
• CPC Class Codes: Y10T 428/2984 Microcapsule with fluid core [includes liposome]
• CPC Class Codes: Y10T 428/2989 Microcapsule with solid core [includes liposome]

Abstract

The present invention relates to blends of encapsulated biocides with free biocides. In particular, the present invention relates to blends of encapsulated 4,5-dichloro-2-n-octyl-3(2H)-isothiazolone (“DCOIT”) with free biocides. The invention also relates to marine antifouling coatings and paints incorporating free biocides and encapsulated DCOIT, and using the free biocides and encapsulated DCOIT in marine antifouling coatings and paints.

Claims

1. A coating composition comprising:

a. a microencapsulated biocide comprising an isothiazolone biocide or antifouling agent as a core material encapsulated in a wall material that is essentially impermeable to xylene and from which water can leach the biocide from the wall material;

b. free isothiazolone biocide or antifouling agent;

c. a film forming polymer or binder; and

d one or more solvents;

wherein the concentration of free isothiazolone biocide or antifouling agent is from 0.25 percent, by weight of the composition, up to a concentration that does not reduce the glass transition temperature of the film forming polymer by more than 20°

C.

2. The coating composition of claim 1 wherein the microencapsulated biocide comprises 4,5-dichloro-2-n-octyl-3(2H)-isothiazolone.

3. The coating composition of claim 1 wherein the free isothiazolone biocide comprises 4,5-dichloro-2-n-octyl-3(2H)-isothiazolone.

4. The coating composition of claim 1 wherein the composition comprises two or more microencapsulated biocides or antifouling agents.

5. The coating xomposition of claim 1 wherein the composition comprises two or more free isothiazolones biocides or antifouling agents.

6. A coating composition comprising:

a. a microencapsulated biocide comprising an isothiazolone biocide or antifouling agent as a core material encapsulated in a wall material that is essentially impermeable to xylene and from which water can leach the biocide from the wall material;

b. free isothiazolone biocide or antifouling agent;

c. a film forming polymer or binder; and

d one or more solvents;

wherein the concentration of free isothiazolone biocide or antifouling agent is from 0.25 percent, by weight of the composition, up to a concentration that does not result in an increase in drying time of the composition.

7. The coating composition of claim 6 wherein the microencapsulated biocide comprises 4,5-dichloro-2-n-octyl-3(2H)-isothiazolone.

8. The coating composition of claim 6 wherein the free isothiazolone biocide comprises 4,5-dichloro-2-n-octyl-3(2H)-isothiazolone.

9. The coating composition of claim 6 wherein the composition comprises two or more microencapsulated biocides or antifouling agents.

10. The coating composition of claim 6 wherein the composition comprises two or more free isothiazolones biocides or antifouling agents.