polysiloxane, still for framstellning derav and anvendning of polysiloxanen for protecting materials from tillvext of harmful organisms

摘要

New precursors for prodn. of compsns. for protecting materials (e.g. ships) against the growth of undesired organisms are cpds. of formula (I). In this formula, m is 1-10; each X (same or different) is =5C alkyl, =5C alkoxyalkyl or a gp. Y; Y is a residue -SnR1R2R3 in which R1, R2 and R3 are alyl, cycloalkyl or aryl, the total carbon content of R1, R2 and R3 being =18C-atoms. The residues X are so chosen so that the Sn:Si ratio of (I) is =1:50. New antifouling polysiloxanes consist of randomly crosslinked groups of formula (II), (III) and (IV) in which the the ratio of Sn to Si is ca 1:50 to 2:5, and the branchings of the polysiloxanes are terminated by H, 6C alkyl, 6C alkoxyalkyl or Y.