Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1981-09-15
1983-03-08
Hayes, Lorenzo B.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
106 1505, 106 16, 424141, 424288, 523122, 524347, 524351, 524431, C09D 514
Patent
active
043761810
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD AND DISCLOSURE OF THE INVENTION
This invention relates to a stabilized antifouling paint composition. More particularly, it relates to an antifouling paint composition stabilized against viscosity increase and gelation during storage, which comprises a triorganotin-containing polymer, cuprous oxide and a stabilizer.
So far, paints, e.g. vinyl-resin antifouling paints (continuous contact paints) and rosin-type antifouling paints (soluble matrix paints), containing cuprous oxide as an active antifouling ingredient have been used for preventing marine organisms, such as the barnacle and sea lettuce, from sticking to ship hulls and various marine constructions. However, the initial rate of dissolution of the copper ion is so great with them that the antifouling effect cannot be maintained for long. They are also problematic with regard to resistance to alkalis, drying behavior, film strength and so forth, and consequently are not satisfying antifouling paints.
To overcome these disadvantages, triorganotin compounds, such as triphenyltin salts and tributyltin salts, have been employed. Recently, triorganotin-containing polymers which are salts from triorganotin oxides or hydroxides or halides and high-molecular-weight compounds, such as various carboxyl-containing acrylic or alkyd resins, have become objects of attention as antifoulants superior to said simple triorganotin salts.
Antifouling paints containing the triorganotin-containing polymers as antifouling ingredients can maintain their antifoulant performance over a prolonged period of time at minimum and constant rates of dissolution or leaching of the active ingredients. They are epoch-making paints which also have an increased safety in coating with them and bring about a reduction in fuel costs. Supposedly, the superior characteristics of these triorganotin-containing polymers result from the fact that they are slowly hydrolyzed in sea water and the release of the active ingredients, namely triorganotin components, is thereby controlled.
While the triorganotin-containing polymers may be used alone, they are usually used in combination with inorganic copper compounds so as to attain constant antifouling effects. However, when cuprous oxide is combinedly used with the triorganotin-containing polymers to prepare antifouling paints, the paints are subject to changes during storage, which lead to viscosity increase and eventually to gelation. To solve this problem, attempts have been made, such as the two-component system in which cuprous oxide and a triorganotin-containing polymer are mixed just prior to coating therewith (e.g. Japanese Patent Application laid open (Kokai) under No. 119,534/1979) and the use of expensive and highly toxic copper rhodanide in place of cuprous oxide (e.g. Japanese Patent Applications laid open under Nos. 50,236/1978 and 125,233/1979). However, none are satisfactory.
As a result of intensive research by the present inventors on the method of stabilizing antifouling paints containing (as active ingredients) cuprous oxide, which has so far been used and is safer and inexpensive, and a triorganotin-containing polymer for storage for a prolonged period, it has now been found that such antifouling paints can be stabilized against viscosity increase and gelation by the addition of a small but effective amount of a hindered phenol. This finding has led to the present invention.
Thus, the invention provides an antifouling paint composition stabilized against viscosity increase and gelation, which comprises a triorganotin-containing polymer and cuprous oxide as combined active ingredients, a stabilizing amount of a hindered phenol, and a solvent therefor.
The triorganotin-containing polymer, which is the active ingredient to be used in the practice of the present invention, includes homopolymers of a triorganotin salt of an unsaturated carboxylic acid, such as acrylic, methacrylic, maleic or itaconic acid, copolymers thereof with each other or with a copolymerizable unsaturated compound, such as vinyl chloride, vinyl a
REFERENCES:
patent: 3392157 (1968-07-01), Izumi
patent: 4139515 (1979-02-01), Dennington
patent: 4191579 (1980-03-01), Hails et al.
patent: 4270953 (1981-06-01), Nakagawa et al.
Hidaka Yasuhiro
Ike Tetsuji
Suenobu Koreyoshi
Hayes Lorenzo B.
Yoshitomi Pharmaceutical Industries Ltd.
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