Storage-stable silicone compositions
Silicone compositions containing: (A) 100 parts by weight of organopolysiloxane(s) having an OH content, based on Si-bonded OH groups, of 1 to 100 weight ppm; and (B) 1-200 parts by weight of filler(s) having a specific surface area of at least 50 m 2 /g, exhibit surprising stability and are useful for preparing numerous compositions where a stable viscosity is desirable.
1. A silicone composition comprising
(A) 100 parts by weight of one or more organopolysiloxane(s) having an OH content, based on Si-bonded OH groups, of 1 to about 5 ppm, and
(B) 1-200 parts by weight of one or more filler(s) having a specific surface area of at least 50 m 2 /g.
2. The composition of claim 1 , wherein the organopolysiloxane(s) (A) contain on average per molecule, at least one radical having an aliphatic carbon-carbon multiple bond.
3. A silicone composition comprising
(A) 100 parts by weight of one or more organopolysiloxane(s) having an OH content, based on Si-bonded OH groups, of 1 to 100 weight ppm, and
(B) 1-200 parts by weight of one or more filler(s) having a specific surface area of at least 50 m 2 /g,
wherein the organopolysiloxane(s) (A) contain on average per molecule, on average at least one Si-bonded hydrogen atom.
4. The silicone composition of claim 3 , wherein the organopolysiloxane(s) (A) contain on average per molecule, at least one Si-bonded hydrogen atom and also contain per molecule on average at least one radical having an aliphatic carbon-carbon multiple bond.
5. The crosslinkable silicone composition of claim 2 , which further comprises:
(F) at least one hydrosilylation catalyst, and
(H) at least one SiH crosslinking agent.
6. The crosslinkable silicone composition of claim 3 , wherein the organopolysiloxane(s) (A) further comprise on average per molecule, more than one radical having an aliphatic carbon-carbon multiple bond, and said composition additionally comprises a (F) hydrosilylation catalyst.
7. The crosslinkable silicone composition of claim 4 , which further comprises (F) a hydrosilylation catalyst.
8. A silicone composition comprising
(A) 100 parts by weight of one or more organopolysiloxane(s) having an OH content, based on Si-bonded OH groups, of 1 to 100 ppm, and
(B) 1-200 parts by weight of one or more filler(s) having a specific surface area of at least 50 m 2 /g,
said composition additionally comprising (L), a peroxide, wherein the organopolysiloxane(s) (A) contain on average per molecule, at least one radical having an aliphatic carbon-carbon multiple bond.
9. The silicone composition of claim 1 , wherein the filler is precipitated and/or pyrogenic silica, which is optionally a hydrophobized silica.
10. A shaped article produced by crosslinking the compositions of claim 5 .
11. A shaped article produced by crosslinking the compositions of claim 6 .
12. A shaped article produced by crosslinking the compositions of claim 7 .
13. A shaped article produced by crosslinking the compositions of claim 8 .
14. A shaped article produced by crosslinking the compositions of claim 9 .