Organopolysiloxanes and curable organopolysiloxane preparation containing them

Process for the preparation of an organopolysiloxane of the general formula ##STR39## wherein R.sup.1 is methyl or an admixture of at least 90% of methyl with the remainder being phenyl;

• and
• R.sup.2 is a member selected from the group consisting of
• (a) R.sup.1,
• (b) linear or branched alkinoxy with 3 to 25 carbon atoms, and
• (c) a polyalcohol with 2 to 6 hydroxyl groups from which the H-atom of the OH-groups is eliminated with all but one of the OH-groups being etherified with allyl alcohol,
• ______________________________________ x = 1 to 2000, y = 0 to 20, and z = to 10, ______________________________________
• with the proviso that at least one --C.tbd.C-- group of said alkinyloxy is contained in the average molecule and that the numerical ratio of the --C.tbd.C-- group to the allyl ether groups is 5:1 to 1:250, which comprises reacting an organopolysiloxane of the general average formula ##STR40## wherein R.sup.1, x, y and z have the above meaning, R.sup.4 is one of
• (a) alkoxy with 1 to 4 carbon atoms,
• (b) halogen or
• (c) hydrogen,
• with a mixture of an alkinol with 3 to 25 carbon atoms and a polyalcohol with 2 to 6 hydroxyl groups, all but one of the hydroxyl groups being etherified with allyl alcohol with the proviso that the reaction is carried out with an amount of (a), (b) or (c) groups and an amount of said mixture, that the average molecule comprises at least one --C.tbd.C-- group and the numerical ratio of the --C.tbd.C-- group to the allyl ether groups is 5:1 to 1:250.

Curable organopolysiloxane preparation, wherein said preparation comprises

• (a) 29.9 to 98.9999 weight percent of ##STR41## wherein R.sup.1 is methyl or an admixture of at least 90% of methyl with the remainder being phenyl;
• and
• R.sup.2 is a member selected from the group consisting of
• (a) R.sup.1,
• (b) linear or branched alkinoxy with 3 to 25 carbon atoms, and
• (c) a polyalcohol with 2 to 6 hydroxyl groups from which the H-atom of the OH-groups is eliminated, with all but one of the OH-groups being etherified with allyl alcohol,
• ______________________________________ x = 1 to 2000, y = 0 to 20, and z = to 10, ______________________________________
• (b) 1 to 70 weight percent of an organopolysiloxane which contains in the average molecule at least 2=SiH groups, and
• (c) 0.0001 to 0.1 weight percent of a catalyst, for the addition reaction of SiH groups to carbon-carbon multiple bonds.

Curable organopolysiloxane preparation, wherein said preparation comprises

• (a) 29.9 to 98.9999 weight percent of ##STR42## wherein R.sup.1 is methyl or an admixture of at least 90% of methyl with the remainder being phenyl;
• and
• R.sup.2 is a member selected from the group consisting of
• (a) R.sup.1,
• (b) linear or branched alkinoxy with 3 to 25 carbon atoms, and
• (c) a polyalcohol with 2 to 6 hydroxyl groups from which the H-atom of the OH-groups is eliminated with all but one of the OH-groups being etherified with allyl alcohol, x=1 to 2000, y=0 to 20, and z=0 to 10, with the proviso that up to 80 weight percent of component (a) is an organopolysiloxane of the general average formula ##STR43## wherein R.sup.1, x, y and z have the above meaning, and
• R.sup.5 is a polyalcohol with 2 to 6 hydroxyl groups from which the H-atom of the OH-groups is eliminated, with all but one of the OH-groups being etherified with allyl alcohol,
• (b) 1 to 70 weight percent of an organopolysiloxane which contains in the average molecule at least 2.tbd.SiH groups, and
• (c) 0.0001 to 0.1 weight percent of a catalyst, for the addition reaction of SiH groups to carbon-carbon multiple bonds.