CURABLE ORGANOPOLYSILOXANE COMPOSITIONS Russian patent published in 2019 - IPC C04B26/32 C08L83/04 

FIELD: chemistry.

SUBSTANCE: invention relates to organopolysiloxane compositions which are curable by the reaction of polycondensation, to a method for their preparation, as well as to their use, primarily for the manufacture of artificial stones. Said polycondensation reaction crosslinkable compositions for manufacture of products contain (A) at least one organosilicon component consisting of units of the formula R_a(OB)_b(R¹O)_cSiO_(4-a-b-c)/2 (I), in which R may have the same or different values and is a monovalent, associated with SiC, optionally substituted hydrocarbon residue with 1–18 carbon atoms, a bivalent, optionally substituted, SiC bonded hydrocarbon residue with 1–18 carbon atoms or a halogen atom bonded to Si, R¹ may have the same or different values and is a monovalent, optionally substituted hydrocarbon residue, a represents 0, 1, 2 or 3, b represents 0, 1, 2 or 3 and c represents 0, 1, 2 or 3, provided that in formula (I) the sum of a+b+c is less than 4, and in the organosilicon component (A) the degree of branching, defined as the ratio of the sum of the links of formula (I) with the index a that is equal to 0 or 1, to the sum of all the links of formula (I) is at least 0.5 and at least 1 % of all links of the formula (I) the sum of b+c is not less than 1, (B) at least one metal compound selected from compounds of metals of the 3^rd, 4^th, and 5^th major subgroups, as well as the 2^nd, 4^th, 5^th, 7^th, and 8^th side subgroups with an oxidation state of +2 to +5 containing at least one carbon atom with an oxidation state of less than 4, and (C) at least one nitrogen-containing compound selected from guanidines and amidines.

EFFECT: curable organopolysiloxane compositions are proposed.

11 cl, 2 tbl