Abstract: The tear strength of cured organosiloxane elastomers can be increased and the compression set value reduced without adversely affecting other physical properties if the composition used to prepare the elastomer is curable by a platinum-catalyzed hydrosilation reaction and contains a mixture of two liquid diorganoalkenylsiloxy terminated polydiorganosiloxanes, one of which constitutes from 96 to 99.5 percent by weight of said mixture and contains the alkenyl radicals only at the terminal positions. The second polydiorganosiloxane contains both terminal alkenyl radicals and from 1 to 5 mole percent of alkenyl radicals on non-terminal repeating units.

Abstract: Liquid organosiloxane MTQ resins of the general formula [M.sub.x T.sub.y Q.sub.z ].sub.n wherein M denotes a monofunctional, T a trifunctional and Q denotes a tetrafunctional siloxane unit is characterized by the fact that n has an average value of from 4 to 14, x+y is not less than z and not more than 2 z and x/y has a value of from 2/1 to 9/1. The resin molecule has at least one reactive substituent as defined and can be made by a method comprising (I) adding together a tetraalkoxysiloxane, a monoorganosilane and a triorganosilane or hexaorganodisiloxane in an acidified aqueous medium provided the tetraalkoxysilane is not added to the aqueous medium prior to the other components, (II) allowing the components to react together in said aqueous medium and, optionally (III) further reacting the finished resin with another compound having N atoms.

Abstract: Heat curable silicone compositions are provided. Some of the heat curable silicone compositions are convertible to silicone elastomers having a high tear strength resulting from the employment of polydiorganosiloxane gum having condensed organoalkenylsiloxy units, which is used in combination with an organosilicon material having tetraorganodisilanoxy groups and a Group VIII metal catalyst, such as platinum in elemental or chemically combined form.

Abstract: A process of making an improved coating composition by combining alkyltrialkoxy silanes such as n-hexyltrimethoxysilane and methyltrimethoxysilane, in the presence of a silane catalyst having at least one amino-substituted functional group, at least one alkoxy-substituted group wherein the alkoxy-substituted group has at least 2 carbon atoms in the alkoxy group and optionally, an alkyl group, in an amount of water less than a stoichiometric amount of water. The combined monomer, catalyst and water are ultrasonically agitated to form an emulsion to hydrolyze the silanes to the extent permitted by the amount of water present and to form a moisture-curable coating composition.

Abstract: The invention relates to novel chlorine-containing silazane polymers, to their preparation, their further processing to ceramic material containing silicon nitride, and this material itself. In order to prepare the chlorine-containing silazane polymers, oligosilazanes of the formula (I) ##STR1## in which a >0, b.gtoreq.0 and n is about 2 to about 12, are reacted with at least one of the chlorosilanes Cl.sub.2 R.sup.4 Si--CH.sub.2 --CH.sub.2 --SiR.sup.4 Cl.sub.2, Cl.sub.3 Si--CH.sub.2 --CH.sub.2 --SiR.sup.5 Cl.sub.2, R.sup.6 SiCl.sub.3 or R.sup.7 SiHCl.sub.2 at 30.degree. C. to 300.degree. C., where, independently of one another,R.sup.1 and R.sup.2 =H, C.sub.1 -C.sub.6 -alkyl or C.sub.2 -C.sub.6 -alkenyl,R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 =C.sub.1 -C.sub.6 -alkyl or C.sub.2 -C.sub.6 -alkenyl andwhere if b=0 the reaction with R.sup.7 SiHCl.sub.2, if R.sup.7 =C.sub.1 -C.sub.6 -alkyl and none of the other chlorosilanes is present, is to be excluded.

Abstract: A thermoformable acoustical mat composition having reduced quantities of ethylene vinyl acetate and elastomers and increased filler concentrations. The composition includes an intimate blend of 5% to 30% of an asphalt constituent; 4% to 15% of an elastomer binder constituent; 50% to 80% of a filler constituent and 1% to 8% of an ethylene co-polymer constituent. A method of melt mixing and extrusion forming thermoformable acoustical mat compositions is also provided.

Abstract: A composition which is curable to an elastomer comprising:A polymer or mixture of polymers of the formula ##STR1## wherein: X are monovalent moieties having ethylenic unsaturation which can be the same or different;Y are divalent linking groups which can be the same or different;m is an integer of 0 to 1;D are monovalent moieties which can be the same or different selected from the group consisting of hydrogen, an alkyl group of 1 to about 10 carbon atoms, aryl, and substituted aryl;R are divalent hydrocarbon groups which can be the same or different;R.sup.1 are monovalent moieties which can be the same or different selected from the group consisting of alkyl, substituted alkyl, aryl, and substituted aryl;R.sup.2 are monovalent moieties which can be the same or different selected from the group consisting of alkyl, substituted alkyl, aryl, and substituted aryl;R.sup.

Abstract: A specific polyimide resin is provided which is soluble in low-boiling organic solvents. Polyimide resin films having improved adhesion, heat resistance, electrical and mechanical properties are prepared from solutions of the polyimide resin through a brief heat treatment.

Abstract: Novel organopolysiloxane compositions that are storage-stable in the absence of moisture, but curable into elastomeric state in the presence of moisture, nonetheless devoid of any organometallic curing catalyst, include (A) an .alpha.,.omega.-dihydroxydiorganopolysiloxane oil, (B) a ketiminoxysilane crosslinking agent, (C) inorganic filler material, (D) an organofunctional silane and (E) a substituted hydroxylamine; the crosslinked elastomers produced from these organopolysiloxane compositions are well adopted for such applications as foodstuff packaging, medical bandaging and antifouling/antisoiling coatings.

Abstract: A method of producing a conductive silicone rubber particulate is disclosed in which the particulate is from 0.1 to 100 micrometers average diameter and is coated on the surface with carbon black. The method prepares an aqueous dispersion of silicone rubber composition particulate, carbon black, surfactant, and water, then removes the water.

Abstract: The present invention relates to a method of producing silazane polymers with silicon functional groups attached to the nitrogen. The method comprises treating a silazane polymer containing an N-H bond with an alkyllithium and then reacting the resultant silazane polymer with a chlorosilane. The invention also relates to novel silazane polymers produced by the above process as well as the use of these polymers to form ceramic materials.

Abstract: There is provided an organopolysiloxane composition having low compression set as well as fuel and oil resistance in addition to high strength, good elongation, and tear comprising:(A) 100 parts of a first component comprising:(1) a vinyl-containing liquid organopolysiloxane or a blend of vinyl-containing liquid polysiloxanes;(2) optionally, filler; and(3) a catalyst; and(B) from 1 to 100 parts, based on 100 parts of (A), of a hydrogen silicone composition selected from the class consisting of hydrogen containing silanes and hydrogen containing polysiloxanes and mixtures of hydrogen containing polysiloxanes with fillers and high viscosity polysiloxanes;(C) optionally, magnesium oxide to impart oil resistance;(D) optionally, an MQ resin to impart fuel resistance; and(E) optionally, a cerium containing compound or, alternatively, tetramethyldivinyldisilazane to impart low compression set.

Abstract: A primer composition comprising:(A) an organosilicon compound formed by binding an organosilicon compound represented by the general formula (I): ##EQU1## wherein R.sup.1 represents a monovalent hydrocarbon group; X represents a hydrogen atom, a lower alkyl group, etc.; and 0.ltoreq.a<0.2, 0.ltoreq.b<0.2 and 1<c<4,with an organopolysiloxane represented by the general formula (II): ##EQU2## wherein R.sup.2 represents a monovalent hydrocarbon group containing no aliphatic unsaturated group; R.sup.3 represents an alkenyl group; Y represents a hydrogen atom, a lower alkyl group, etc.; and 1.8<d<2.2, 0.004<e<0.2 and 0.ltoreq.f<0.2,in a particular proportion;(B) an organic titanate; and(C) an organic solvent.This primer composition achieves adhesion with good durability at high temperatures, particularly in high temperature oils.

Abstract: A crosslinked organosilicon polymer or crosslinkable organosilicon prepolymer comprising alternating (a) polycyclic polyene residues and (b) polysiloxane/siloxysilane residues linked through carbon to silicon bonds, wherein the polycyclic polyene residues are derived from polycyclic polyenes having at least two non-aromatic carbon-carbon double bonds in their rings and the polysiloxane/siloxysilane residues are derived from (i) cyclic polysiloxanes or tetrahedral siloxysilanes and (ii) linear, .tbd.SiH terminated polysiloxanes.

Abstract: According to this invention, a microemulsion of an organopolysiloxane containing cyclohexylamino groups is prepared as follows: component (A), an organopolysiloxane containing cyclohexylamino groups and component (B), a nonionic surfactant and component (C), ethylene glycol or propylene glycol are blended. Formic acid or acetic acid, component (D) and water, component (E), are then added. The mixture is then stirred to form an emulsion precursor liquid, which is then dispersed in a prescribed amount of water. The microemulsion of the organopolysiloxane containing cyclohexylamino groups prepared using the method of this invention has an excellent shelf stability.

Abstract: The invention discloses novel organofunctional silicone polymers which have an amphoteric pendant functionality. Compounds of the invention by virtue of their amphoteric structure are good detergents and foaming agents and essentially non irritating to eyes and skin. The compounds of the invention are nonirritating, and non yellowing and provide detergency and foam to many formulated products, including cosmetic and personal care products.The compounds of the present invention are prepared by introduction of a amphoteric group by reaction of acrylic acid or methyl acrylate with a primary alkoxylated amine containing the silicone polymer.

Abstract: Organosilicon-metal polymers are prepared by mixing an organosilicon polymer containing a multiplicity of Si-H and/or Si-Si functional groups with a sufficient quantity of a metal carbonyl for the metal carbonyl to be incorporated into the organosilicon polymer. These polymers can be used to prepare ceramics.

Abstract: The invention disclosed novel amino functional silicone polymers which have an ether amino pendant group. Compounds of the invention by virtue of their ether amino group, deposition on the surface of substrates, either alone or as complexes with cations, thereby altering the substrate's surface physical properties. The desirable durable properties which can be given to substrates include: softness, lubrication, soil release, and hydrophobicity. The compounds of the present invention are prepared by introduction of an amino group onto the silicone pendant group. Cyanoethylation followed by hydrogenation or reaction with ethylenimine or propylenimine of a hydroxy containing silicone polymer, or hydroxy containing vinyl intermediate which is subsequently introduced into the polymer backbone by hydrosilation are the preferred methods of preparation.

Abstract: Non-agglomerating elastomeric organopolysiloxane particulates having a mean particle size ranging from 50 .mu.m to 3 mm, uniformly coated with silica powder on the face surfaces thereof and well adapted as a soft filler material for natural or synthetic polymers or as a controlled release dosage form, are produced by (a) forming an oil-in-water emulsion of .alpha.,.omega.-dihydroxydiorganopolysiloxane oils, silica powder, a platinum curing catalyst and, optionally, an active principle such as a medicament or an agrochemical, and then (b) breaking and polycondensation crosslinking such emulsion into the desired particles by heating it to a temperature ranging from 40.degree. to 100.degree. C.

Abstract: An organopolysiloxane composition comprising an organopolysiloxane and compounded therein a silica fine powder treated with a silazane compound containing a group represented by the following formula: ##STR1## wherein Rf represents a fluorine-containing organic group; R.sup.2 represents a monovalent hydrocarbon group containing no fluorine atom; R.sup.3 represents a divalent hydrocarbon group; and c is an integer of 0, 1 or 2. The composition has superior release properties and transparency.