Abstract: The present invention relates to a process for the preparation of trioganosilyl-terminated polydiorganosiloxanes by basic polymerization of cyclic diorganopolysiloxanes and triorganosilyl-terminated siloxanes, wherein, before the polymerization, a part of the cyclic diorganosiloxane is distilled off in the presence of the polymerization catalyst at a temperature which is at least 10.degree. C. below the polymerization temperature.

Abstract: Polysiloxanes of relatively low molecular weight are catalytically polymerized/rearranged into high molecular weight polysiloxanes in the presence of a cationic catalyst comprising a porous, inorganic mineral particulate support having an average pore diameter in excess of 20 .ANG. and a pore volume ranging from 0.2 to 2 ml/g, said porous support being coated with less than 15 mg/m.sup.2 of a film of polymeric material comprising pendant sulfonic or phosphonic acid functions, and said polymeric material being characterized by an ion exchange capacity of less than 2 milliequivalents per gram.

Abstract: A process for addition curing organosilicone compositions using as catalysts rhodium- or iridium-nitrogen complex compounds having the formulae:(a) monometallic complexes, (L)MX(Y).sub.2, and(b) bimetallic complexex, (L) [RhX(CO).sub.2 ].sub.2,wherein:M is a rhodium or iridium metal atom,L is a single or fused heterocyclic ligand comprising at least one five- or six-membered ring, said ligand having 2 to 4 ring nitrogen atoms in the same ring,Y is an uncharged ligand that fills one or two coordination positions of the metal atom, andX is Cl, Br, I, or CN.Preparation of the novel catalysts is disclosed. The cured compositions are useful as molded articles, such as gaskets, O-rings, and tubing.

Abstract: The invention provides a novel diorganopolysiloxane compound composed of dimethysiloxane units, methyl (2-perfluoroalkylethyl)siloxane units and methyl acyloxyalkylsiloxane units. The novel diorganopolysiloxane compounds of the invention have excellent lubricating properties so that they are useful as an additive ingredient in various materials such as coating compositions, magnetic layer of recording tapes and the like where lubricity or mold releasability is essential.

Abstract: This invention is directed to the preparation of certain arylene bis-silanols in highly purified form and to the preparation of five new arylene bis-silanols in particular, along with a procedure for polymerizing these and other arylene-type bis-silanols using phosgene as a polymerization promotor or catalyst, to obtain highly purified, high molecular weight arylene-siloxanylene polymers having the characteristic structure: ##STR1## where Y is an arylene or substituted arylene moiety; R and R' are the same or different alkyl group(s), substituted alkyl group(s) or a phenyl group, x ranges from about 1 to 3 and n ranges from about 300 to 1500; said polymers having molecular weights (number average) of 100,000 and higher.Preferred polymers are those arylenesiloxanylenecarbonate polymers which, when laminated to polycarbonate sheets or glass maintain their transparency, stability and adherence to said substrates at temperatures of up to and including 400.degree. F.

Abstract: High molecular weight organopolysiloxanes, e.g., polydimethylpolysiloxane oils and gums, are facilely and rapidly prepared by polymerizing/rearranging a lower molecular weight organopolysiloxane in the presence of a catalytically effective amount of an alkaline catalyst and a tris-(oxaalkyl)-amine accelerator having the formula (I):N--CHR.sub.1 --CHR.sub.2 --O--CHR.sub.3 --CHR.sub.4 --O).sub.n R.sub.5 ].sub.3 (I).

Abstract: Compositions having liquid crystal phases which contain at least one component consisting of an organopolysiloxane having mesogenic molecules chemically bonded thereto as side chains which are obtained by grafting vinyl-substituted mesogenic molecules to an organohydrogenpolysiloxane. The organopolysiloxane backbone may also carry different molecules, such as nematogenic and cholesterogenic or chiral molecules, as side chains.

Abstract: A fluorosilicone polydimethylsiloxane equilibration chainstopper and process for making same are disclosed. The chainstopper has a fluorosilicone content in the range of 30 mole percent to 60 mole percent and is a preferred chainstopper in equilibration reactions in the production of vinyl-stopped fluorosilicone polydimethylsiloxane copolymers.

Abstract: A process for the preparation of a halogen silane and an aromatic compound having at least one --C.dbd.O-- of ##STR1## group, while simultaneously effecting cleavage of a siloxane by contacting a compound having at least one aromatically bound mono and/or dihalogen methylene group or an aromatic compound having a mono-, di and or trihalogen methyl group of the formula ##STR2## wherein the aromatic moiety can be optionally otherwise substituted, with a siloxane of the formula ##STR3## wherein each R moiety is independently selected from the group consisting of halogen, alkyl, alkenyl and O-SiR.sub.

Abstract: In the preparation of equilibration products of organosiloxanes by contacting at least one organosiloxane with a cation exchange resin, the improvement which comprises employing as said resin a polymer having side chains carrying sulphonyl groups, the carbon atoms carrying the sulphonyl groups also carrying at least one fluorine atom.

Abstract: In the production of linear and branched equilibrated acyloxy-containing organopolysiloxanes by reacting a chlorosilane of the formulaR.sub.a R'.sub.b SiCl.sub.(4-a-b)in whicha is 0,1,2 or 3,b is 0,1,2 or 3, anda+b.ltoreq.3,or a partial hydrolysate thereof, with at least one organosiloxane containing the componentsR.sub.2 R"--SiO.sub.1/2,R R"--SiO,R"--SiO.sub.3/2 andSiO.sub.2in whichR and R" each independently is H or an optionally halogen- or cyano-substituted monovalent hydrocarbon radical having up to 12 carbon atoms, andR" is Cl, OH, H or an optionally halogen- or cyano-substituted monovalent hydrocarbon radical having up to 12 carbon atoms,in the presence of an equilibration catalyst, the improvement which comprises employing as the equilibration catalyst a salt of a fluorinated alkane sulphonic acid plus a monobasic carboxylic acid, the total number of Si--Cl groups exceeding the total number of Si--OH groups in the reactants and the monobasic carboxylic acid being present in at least about 1.

Abstract: Organosiloxane equilibrations and other bond rearrangements are easily and rapidly accomplished through the utilization of catalysts comprised of solid perfluorinated polymers containing pendant sulfonic acid groups.