Rohm and Haas Company

Hirotake Ikari

Teruyoshi Takahashi

Wataru Agui

Motomi Ohta

Hiroshi Kanbara

Kanichi Kakizaki

An aquatic antifouling composition characterized by containing as effective antifouling component a metal salt of hexamethylenedithiocarbamic acid represented by the formula below: ##STR1## (where M is a divalent or trivalent metal; n is 2 or 3.)

Aquatic antifouling composition

An aquatic antifouling composition comprising (A) at least one 4-isothiazolin-3-one compound represented by the general formula: ##STR1## where X.sub.1 and X.sub.2 respectively represent a hydrogen atom or a halogen atom, and (B) at least one insoluble dithiocarbamic acid derivatives possessing a dithiocarbamyl group ##STR2## selected from the group consisting of divalent and higher heavy metal (zinc, manganese, copper, iron, and nickel) salts of ethylenebisdithiocarbamic acid, linear or branched propylenebisdithiocarbamic acid, linear or branched butylenebisdithiocarbamic acid, N-substituted ethylenebisdithiocarbamic acid, N,N'-substituted ethylenebisdithiocarbamic acid, N-substituted propylenebisdithiocarbamic acid, N,N'-substituted propylene-bisdithiocarbamic acid, N-substituted butylenebisdithiocarbamic acid, and N,N'-substituted butylenebisdithiocarbamic acid.

Compounds of formula I ##STR1## (wherein R represented (C.sub.1 -C.sub.4)alkyl, cyclohexyl, trichloromethyl, ethoxycarbonyl, or isopropoxycarbonyl) optionally together with dithiocarbamate-type compounds, are effective aquatic antifouling agents.

Aquatic antifouling compositions

There is disclosed a method for selectively regulating weed plant growth in transplanted rice fields under aquatic conditions which comprises applying to said weed plants an effective amount of a compound of the formula: ##STR1## wherein: X is selected from hydrogen, (C.sub.1 -C.sub.4) alkyl, F, Cl, Br, NO.sub.2, or SO.sub.2 C.sub.6 H.sub.5 ;

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Ciba, Japan

Hirotake Ikari