Abstract: Disclosed is a curable silicone composition comprising: (A) an organopolysiloxane having a silicon-bonded unsaturated aliphatic radical; (B) an organopolysiloxane having a silicon-bonded mercaptoalkyl radical; and (C) a photoreaction-initiating amount of photoreaction initiator. The photoreaction initiator includes arylcarbonyl phosphine oxide compounds, having a radical selected from the group consisting of substituted and unsubstituted aryl radicals, and another two radicals selected from the group consisting of substituted and unsubstituted monovalent hydrocarbon radicals. The above silicone, composition is efficiently cured by visible light radiation and usable for photo-curable adhesives.

Abstract: A photocurable adhesive composition for glass is disclosed, comprising (A) 100 parts by weight of a polyorganosiloxane having an average compositional formula: ##STR1## wherein R.sup.1 represents a substituted or unsubstituted monovalent hydrocarbon group except for a vinyl group; 0<a.ltoreq.1; 0<b.ltoreq.2; and 1<a+b<3, (B) from 0.1 to 10 parts by weight of an aromatic ketone photo reaction initiator, and (c) from 0.1 to 5 parts by weight of a trialkenyl isocyanurate or a derivative thereof. The composition, when applied between glass plates or between a glass plate and other materials, can be cured with a small curing shrinkage by short-term irradiation of light transmitted by the glass plate. The cured composition exhibits satisfactory adhesion and excellent resistance to moisture and heat.

Abstract: An addition curable polyorganosiloxane composition is stabilized against premature cure at room temperature by the presence of one or more compounds selected from the group consisting of (i) a silane compound represented by the following general formula:(R.sup.4).sub.n Si(OR.sup.5).sub.4-nin which R.sup.4 represents a member selected from the group consisting of a hydrogen atom and a substituted or unsubstituted monovalent hydrocarbon group; R.sup.5 represents a substituted or unsubstituted monovalent hydrocarbon group containing a --C.tbd.C-- bond; "n" represents an integer of from 1 to 3; and at least one member selected from the group consisting of Si--H, Si--CH.dbd.CH.sub.2 and Si--C.tbd.CH bonds is contained in the molecule and (ii) an organosilane compound obtainable by subjecting the above silane compound to addition reaction between Si-H and --C.tbd.C-- bonds contained therein.The composition is highly stable at room temperature and can be stored for extended periods of time.

Abstract: An apparatus for stabilizing turbine generator shaft torsional oscillations including: a current detector for detecting ac current of a turbine generator used in combination with a dc power-transmission system, a filter to which an output of said current detector is delivered, the filter comprising a first bandpass filter for detecting a sub synchronous component (f.sub.l -f.sub.m) and a second bandpass filter for detecting a super synchronous component (f.sub.l +f.sub.m) where a fundamental freuency of the generator is represented by f.sub.l and a natural frequency of the mechanical shaft system of the generator is represented by f.sub.m, a calculation circuit for applying conversion of at least one of d and q axis to respective outputs from the first and second bandpass filters using a generator phase .theta..sub.G to take out at least one of .DELTA.i.sub.d and .DELTA.i.sub.

Abstract: A silicone sealant composition comprising(A) 100 parts by weight of a silanol terminated polydiorganosiloxane having a viscosity of 100 to 200,000 cSt at 25.degree. C.,(B) 0.1 to 30 parts by weight of an aminoxy group-containing organosilicon compound containing, on the average, more than two organoaminoxy groups per molecule,(C) 5 to 300 parts by weight of an inorganic filler, and(D) 1 to 30 parts by weight of an ultraviolet-curable oligomer containing acryl groups.

Abstract: Silicone elastomeric compositions suitable for ultraviolet ray curing comprising:(A) 100 parts by weight of a polyorganosiloxane of the general formula:(CH.sub.3).sub.2 R.sup.1 SiO--R.sub.2.sup.2 SiO].sub.n SiR.sup.1 (CH.sub.3).sub.2 (1)wherein R.sup.1 represents hydrogen or a monovalent radical selected from the group consisting of methyl, vinyl, and hydroxy, R.sup.2 represents hydrogen or a substituted or unsubstituted monovalent hydrocarbon radical, 0.02-49.95% based on the total number of R.sup.1 and R.sup.2 groups are vinyl radicals 0.05-49.98% based on the total number of R.sup.1 and R.sup.2 groups are hydrogen and n represents a number from 10-10,000.(B) 0.5-10 parts by weight of a polyorganosiloxane having an average formula: ##STR1## wherein R.sup.3 represents a substituted or unsubstituted monovalent hydrocarbon radical other than vinyl, a represents a number of 0.01.ltoreq.a.ltoreq. in an average, and b represents a number of 0.ltoreq.

Abstract: There is provided herein a curable silicone elastomer composition comprising the following components: (A) 100 parts by weight of a polyorganosiloxane having at least two silicon-bonded vinyl groups per molecule, (B) 1 to 300 parts by weight of fine powders of tungsten carbide and (C) a component for crosslinking of said component (A) selected from the group consisting of (1) a combination of (a) 0.1 to 10 parts by weight of a polyorganohydrogensiloxane having an average of at least two silicon-bonded hydrogen atoms per molecule and (b) 0.000001 to 0.1 part by weight of a platinum catalyst; (2) a combination of said (a), (b) and (c) 0.00001 part to less than 0.1 part by weight of an organic peroxide except from organohydroperoxide; (3) a combination of said (a) and (d) 0.00001 part to less than 0.2 part by weight of the reaction product between said (b) and (c); and (4) 0.1 to 3.0 parts by weight of an organic peroxide except from organohydroperoxide.

Abstract: A silicone rubber composition comprising(A) 100 parts by weight of polyorganosiloxane having the formula: ##EQU1## wherein R.sup.1 is a substituted or unsubstituted monovalent hydrocarbon group with the proviso that from 0.01 to 0.3% of the R.sup.1 groups are vinyl groups, a is a number of from 1.98 to 2.0001, and n is a number of at least 3,000,(B) 10 to 100 parts by weight of finely divided silica,(C) more than 5 to 20 parts by weight of a polyorganohydrogensiloxane having the formula: ##EQU2## wherein R.sup.2 is a substituted or unsubstituted monovalent hydrocarbon group with the proviso that from 0.2 to 2.5% of the R.sup.2 groups are vinyl groups, b is a number of from 1.5 to 2.0, c is a number of from 0.01 to 0.5, the value of (b+c) is in the range of from 1.8 to 2.1, and m is a number of from 30 to 3,000, and(D) 0.01 to 3 parts by weight of organic peroxide.

Abstract: A heat-curable polysiloxane composition comprised of polydiorganosiloxane having at least 2 vinyl groups and polyorganohydrogensiloxane having at least 2 hydrogen atoms, and containing, as a catalyst, a platinum compound and a phosphorus compound or complex thereof, together with an organic peroxide compound which has no hydroperoxy group in the molecule.

Abstract: A curable silicone composition comprising 100 parts by weight of polyorganosiloxane containing at least 2 vinyl radicals bonded to silicon atom(s) in the molecule 0.1-10 parts by weight of polyorganohydrogensiloxane containing more than 2 hydrogen atoms bonded to silicon atom(s), on the average, in the molecule, 5-500 parts by weight of fine powder of a transition metal, and a catalytic amount of a platinum catalyst containing no halogen atoms in the molecule.