Abstract: Curable organopolysiloxane compositions contain (A) organopolysiloxane resins consisting of units of the formula RaR1b(OR2)cSiO(4?a?b?c)/2 ??(I), with the proviso that in formula (I) the sum of a+b+c?3, in at least one unit of the formula (I) b=1, in at least 50% of the units of the formula (I) a+b=1 and in at most 10% of the units of the formula (I) a+b=3, based in each case on all siloxane units of the formula (I) in organopolysiloxane resin (A), (B) organic compounds having at least one unit of the formula CR32=CR3—CO—Z—??(II), (C) initiators, (D) fillers and (K) amines, wherein the radicals and indices have the definition specified in claim 1. When coarse and fine grained fillers are employed, the composition can be used to mold artificial stone.

Abstract: A cross-linkable composition along with processes for producing the same, uses for the same and articles made therefrom. The cross-linkable composition includes (A) at least one organic compound that is free of siloxane units having at least two reactive cyanate ester groups (?“N?C—O—”) and (B) at least one cyclosiloxane having the general formula (I) [RaRb1SiO2/2]m ??(I). Where R may be identical or different and represents monovalent, SiC-bonded, saturated aliphatic hydrocarbon radicals; where R1 may be identical or different and represents monovalent, SiC-bonded, halogen- or phosphorus-substituted, aromatic hydrocarbon radicals; where a is 0, 1 or 2, preferably 0 or 1, particularly preferably 0; where b is 0, 1 or 2, preferably 1 or 2, particularly preferably 2; where m is 3, 4 or 5, preferably 3 or 4, particularly preferably 4; and where a+b is 2 and at least three radicals R1 are present per siloxane molecule (B).

Abstract: Compositions containing an aliphatically unsaturated silicone resin, an organic compound containing a (meth)acrylate or (meth)acrylamide group, a free radical initiator, and an organylammonium salt are useful in preparing composite articles, especially artificial stone.

Abstract: Addition curable composition containing specific silicone resins containing aliphatically unsaturated groups and an organic compound containing unsaturated groups such as acrylate or methacrylate groups are suitable when used with fine and coarse fillers to produce artificial stone with both high hardness and high flexural strength.

Abstract: Organopolysiloxane mixtures curable by hydrosilylation include MT organopolysiloxanes having 10 to 20 siloxy units and containing a fraction of 0.15 to 0.24 M units based on total siloxy units in the organopolysiloxane, and a polydispersity of 1.05 to 1.40, a hydrosilylation catalyst, and an Si—H-functional organopolysiloxane are curable to vulcanizates with elastic moduli which may be greater than 0.5 GPa.

Abstract: Hydrosilylative crosslinking compositions containing an aliphatically unsaturated compound which is the reaction product of an alkali metal siliconate and a chlorosilane and a coupler having two silicon bond hydrogen atoms have high compression and damping characteristics when cured.

Abstract: A hydrosilylation curable mixture whose cured products have high mechanical damping include a cyclosiloxane bearing aliphatic unsaturation and a coupler having both silicon-bonded hydrogen and at least one aromatic group.

Abstract: Curable organopolysiloxane compositions contain (A) organopolysiloxane resins consisting of units of the formula RaR1b(OR2)cSiO(4-a-b-c)/2 ??(I), with the proviso that in formula (I) the sum of a+b+c?3, in at least one unit of the formula (I) b=1, in at least 50% of the units of the formula (I) a+b=1 and in at most 10% of the units of the formula (I) a+b=3, based in each case on all siloxane units of the formula (I) in organopolysiloxane resin (A), (B) organic compounds having at least one unit of the formula CR32?CR3—CO—Z—??d(II), (C) initiators, (D) fillers and (K) amines, wherein the radicals and indices have the definition specified in claim 1. When coarse and fine grained fillers are employed, the composition can be used to mold artificial stone.

Abstract: Addition curable composition containing specific silicone resins containing aliphatically unsaturated groups and an. organic compound containing unsaturated groups such as acrylate or methacrylate groups are suitable when used with fine and coarse fillers to produce artificial stone with both high hardness and high flexural strength.

Abstract: Synthesis of organyloxyfunctional organosilicon compounds is facilitated by a two-step process using a basic lithium, guanidine or amidine catalyst in the first step, and a phosphorus compound having a P?O linkage in a second step.

Abstract: Artificial stone having excellent mechanical and weatherability properties is prepared from a highly filled crosslinkable organosilicon composition where the filler comprises at least 20 weight percent of coarse fillers, the organosilicon component contains silicon-bonded alkoxy and or hydroxyl groups, with a catalyst containing a metal compound and an amidine or guanidine.

Abstract: Synthesis of organyloxyfunctional organosilicon compounds is facilitated by a two-step process using a basic lithium, guanidine or amidine catalyst in the first step, and a phosphorus compound having a P?O linkage in a second step.

Abstract: Artificial stone which exhibits minimal visual change when exposed to weathering, UV light, and heat, is prepared by shaping and curing a crosslinkable composition based on crosslinkable organopolysiloxanes as a binder, at least 85% by weight of a filler component, the filler component containing at least 20% by weight of coarse grain mineral filler having grain sizes of 0.2 mm to 10 mm.

Abstract: Artificial stone having excellent mechanical and weatherability properties is prepared from a highly filled crosslinkable organosilicon composition where the filler comprises at least 20 weight percent of coarse fillers, the organosilicon component contains silicon-bonded alkoxy and or hydroxyl groups, with a catalyst containing a metal compound and an amidine or guanidine.

Abstract: Curable organosilicon compositions with good adhesion to substrates and good workability contain a condensable base organopolysiloxane, a carbamato-alkyl-functional alkoxysilane, and a heterocycle substituted at a heteroatom by an alkoxysilylmethyl group.

Abstract: An artificial stone can be prepared by binding a suitable stone filler with a binder which contains a silicon bonded, hydroxyl-functional silicone resin also optionally bearing silicon bonded alkoxy groups, and an organosilicon compound which is a silane or siloxane bearing silicon bonded alkoxy groups. The artificial stone is resistant to the effects of UV light as well as heat.

Abstract: Artificial stone which exhibits minimal visual change when exposed to weathering, UV light, and heat, is prepared by shaping and curing a crosslinkable composition based on crosslinkable organopolysiloxanes as a binder, at least 85% by weight of a filler component, the filler component containing at least 20% by weight of coarse grain mineral filler having grain sizes of 0.2 mm to 10 mm.

Abstract: An artificial stone can be prepared by binding a suitable stone filler with a binder which contains a silicon bonded, hydroxyl-functional silicone resin also optionally bearing silicon bonded alkoxy groups, and an organosilicon compound which is a silane or siloxane bearing silicon bonded alkoxy groups. The artificial stone is resistant to the effects of UV light as well as heat.

Abstract: Crosslinkable compositions based on organosilicon compounds, more particularly RTV-1 sealants, contain (A) at least one organosilicon compound having at least two condensable radicals, (B) at least one finely divided silicon dioxide having a BET surface area of 30 to 120 m2/g and a relative thickening effect ?rel of 1.4 to 10, and (C) at least one hydrocarbon component which has an initial boiling point above 150° C., a final boiling point below 350° C., each at a pressure of 1013 hPa, a kinematic viscosity of 1.5 to 6.0 mm2/s as measured at 40° C., a viscosity-density constant (VDC) of less than or equal to 0.820, a pour point of less than ?5° C., and an aromatic carbon atom (CA) content of less than 0.1% CA.

Abstract: Crosslinkable compositions based on organosilicon compounds, more particularly RTV-1 sealants, contain (A) at least one organosilicon compound having at least two condensable radicals, (B) at least one finely divided silicon dioxide having a BET surface area of 30 to 120 m2/g and a relative thickening effect ?rel of 1.4 to 10, and (C) at least one hydrocarbon component which has an initial boiling point above 150° C., a final boiling point below 350° C., each at a pressure of 1013 hPa, a kinematic viscosity of 1.5 to 6.0 mm2/s as measured at 40° C., a viscosity-density constant (VDC) of less than or equal to 0.820, a pour point of less than ?5° C., and an aromatic carbon atom (CA) content of less than 0.1% CA.