Rohm and Haas patents BIOCIDES
Patent No. U.S. 7,377,968 B2
Rohm and Haas has obtained a patent for a coating composition comprised of a microencapsulated biocide comprised of 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; free isothiazolone biocide or antifouling agent; a film forming polymer or binder; and one or more solvents. 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.