| 摘要 |
A top coat paint for ships' hulls comprising A. A FILM-FORMING COPOLYMER CONTAINING FROM MORE THAN 50 UP TO 80 PER CENT BY WEIGHT OF UNITS OF AT LEAST ONE TRI-ORGANO TIN SALT OF AN OLEFINICALLY UNSATURATED CARBOXYLIC ACID, THE BALANCE OF THE COPOLYMER BEING UNITS OF AT LEAST ONE OLEFINICALLY UNSATURATED COMONOMER, B. A SUBSTANTIALLY WATER INSOLUBLE METALLIFEROUS PIGMENT CAPABLE OF REACTING WITH SEA-WATER TO FORM A WATER-SOLUBLE METAL COMPOUND, AND C. A HYDROPHOBIC ORGANIC RETARDER FOR RETARDING THE RATE OF ION EXCHANGE BETWEEN SEA-WATER AND THE COPOLYMER (A), WHICH RETARDER I. HAS A SOLUBILITY IN SEA-WATER AT 25 DEG C. of not more than 5 parts per million by weight and is miscible with the copolymer (a), II. HAS A NEGLIGIBLE VAPOUR PRESSURE AT 25 DEG C.
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