Cyclopentadienyl and/or cyclopentadienylene and/or dicyclopentadienylene substituted polyorganosiloxanes crosslinkable into elastomeric state

A process for the preparation of a polysiloxane (P.sub.1) having, per molecule, at least one structural unit of the formula:

• ##STR61## and/or a polysiloxane (P.sub.2) having, per molecule, at least one structural unit of the formula:
• ##STR62## in which formulae the radicals X, which may be identical or different, are each a hydrolyzable halogen atom, N-substituted amino, N-substituted amido, N,N-disubstituted amino, ketiminoxy, aldiminoxy, alkoxy, acyloxy, enoxy or alkoxyalkyleneoxy radical;
• the radicals R.sup.1, which may be identical or different, are each a monovalent hydrocarbon radical having from 1 to 10 carbon atoms or a monovalent hydrocarbon radical having from 1 to 10 carbon atoms substituted by halogen atoms or cyano groups;
• Z is a straight or branched chain divalent saturated hydrocarbon radical having from 1 to 10 carbon atoms;
• a is zero, 1 or 2;
• b is zero, 1 or 2;
• a+b is at most 2;
• and p is 1 or 2, with the proviso that said polysiloxane (P.sub.1) has, per molecule, at least one structural unit (1) if a is other than zero and at least two structural units (1) if a is zero, comprising reacting a straight-chain polydiorganosiloxane having the formula:
• ##STR63## in which t is a number ranging from 5 to 1,000, inclusive, with at least one silane of the formula:
• ##STR64## and/or a silane of the formula:
• ##STR65## and/or a silane of the formula:
• ##STR66## in which formulae h is 2 or 3;
• i is zero or 1;
• h+i=3;
• i' is zero, 1 or 2;
• h' is 1, 2 or 3;
• i'+h'=3;
• j is zero, 1, 2 or 3;
• k is 1, 2, 3 or 4;
• and j+k=4.

A polyorganosiloxane composition which is stable on storage in the absence of moisture and/or gaseous oxygen but which is crosslinkable into elastomeric state by means of atmospheric humidity and/or atmospheric oxygen, comprising, by weight:

• 1. 100 parts of at least one polyorganosiloxane polymer comprising a polysiloxane (P.sub.1) having, per molecule, at least one structural unit of the formula:
• ##STR67## and/or a polysiloxane (P.sub.2) having, per molecule, at least one structural unit of the formula:
• ##STR68## in which formulae the radicals X, which may be identical or different, are each a hydrolyzable halogen atom, N-substituted amino, N-substituted amido, N,N-disubstituted amino, ketiminoxy, aldiminoxy, alkoxy, acyloxy, enoxy or alkoxyalkyleneoxy radical;
• the radicals R.sup.1, which may be identical or different, are each a monovalent hydrocarbon radical having from 1 to 10 carbon atoms or a monovalent hydrocarbon radical having from 1 to 10 carbon atoms substituted by halogen atoms or cyano groups;
• Z is a straight or branched chain divalent saturated hydrocarbon radical having from 1 to 10 carbon atoms;
• a is zero, 1 or 2;
• b is zero, 1 to 2;
• a+b is at most 2;
• and p is 1 or 2, with the proviso that said polysiloxane (P.sub.1) has, per molecule, at least one structural unit (1) if a is other than zero and at least two structural units (1) if a is zero;
• 2. a catalytically effective amount of a metal curing catalyst;
• and
• 3. 0 to 250 parts of at least one inorganic filler material.

The polyorganosiloxane polymer comprising a polysiloxane (P.sub.1) having, per molecule, at least one structural unit of the formula:

• ##STR69## and/or a polysiloxane (P.sub.2) having, per molecule, at least one structural unit of the formula:
• ##STR70## in which formulae the radicals X, which may be identical or different, are each a hydrolyzable halogen atom, N-substituted amino, N-substituted amido, N,N-disubstituted amino, ketiminoxy, aldiminoxy, alkoxy, acyloxy, enoxy or alkoxyalkyleneoxy radical;
• the radicals R.sup.1, which may be identical or different, are each a monovalent hydrocarbon radical having from 1 to 10 carbon atoms or a monovalent hydrocarbon radical having from 1 to 10 carbon atoms substituted by halogen atoms or cyano groups;
• Z is a straight or branched chain divalent saturated hydrocarbon radical having from 1 to 10 carbon atoms;
• a is zero, 1 or 2;
• b is zero, 1 or 2;
• a+b is at most 2;
• and p is 1 or 2, with the proviso that said polysiloxane (P.sub.1) has, per molecule, at least one structural unit (1) if a is other than zero and at least two structural units (1) if a is zero, said polyorganosiloxane being in a crosslinked state.