Abstract: Compounds of the formula I ##STR1## in which n and o are a number from 0 to 50, m is a number from 1 to 50, u and v are 0 or 1, and at least one of the indices u and v is 1, R.sub.1, R.sub.2, R.sub.2a, R.sub.3 and R.sub.4 independently of one another are, for example, aromatic hydrocarbons, R.sub.5, if n and o are 0, is for example C.sub.1 -C.sub.12 alkyl and, if n and/or o are greater than 0, or if n and o are 0 and at the same time only one index u or v is 1, R.sub.5 may additionally, for example, be an aromatic hydrocarbon, at least one of the radicals R.sub.1, R.sub.2, R.sub.2a, R.sub.3, R.sub.4 and R.sub.5 being an aromatic hydrocarbon radical which is sterically hindered ortho to the boron atom, X is, for example, C.sub.1 -C.sub.20 alkylene, phenylene, biphenylene, etc., and Z is a radical which is able to form positive ions, are suitable as photoinitiators, both the compounds per se and their combination with dyes or other electron acceptors.

Abstract: A novel organoboron polymer and its method of preparation is claimed. The organoboron polymer has a backbone having a repeating unit comprising at least one carboranyl group, at least two acetylenic groups, and one or more silyl or siloxanyl groups.

Abstract: A method of preparing a linear inorganic-organic hybrid polymer includes the steps of cooling a reaction medium to a first starting temperature below the ambient temperature and not less than about -10.degree. C., adding n-butyllithium and an organic compound capable of reacting with n-butyllithium to form an organo-dilithium compound to the reaction medium, allowing the organic compound and the n-butyllithium to react to form an organo-dilithium compound while allowing the reaction medium to warm, cooling the reaction medium to a second starting temperature below the ambient temperature and not less than about -10.degree. C.

Abstract: Novel class of organoboron thermosetting polymer and ceramics that are fod from an organoboron polymer having a backbone with a repeating of at least one alkynyl group, at least one silyl group, at least one boranyl group, optionally at least one siloxyl group, and optionally an aryldisilyl group. The boron containing units in and the silicon containing units can be arranged in either random occurrences between each other or in the form of interdispersed block-type structures of each unit. The thermosetting polymers are useful as high temperature, oxidatively stable thermosetting plastics and for microelectronic applications.

Abstract: Copolymers are formed from aromatic acetylenic monomers, or prepolymers fed therefrom, and carborane-(siloxane or silane)-unsaturated hydrocarbon polymers. These copolymers can be used as is to form useful articles, adhesives, matrix materials, and coatings for various marine and aerospace applications, or may be pyrolyzed to form carbon-ceramic composites.

Abstract: The present invention relates to novel preceramic oligo- or polyborosilazane compounds having the structural feature Si--N--B, and to a ceramic material based on SiN and BN, to a process for the production thereof and to the use of the polyborosilazanes and the ceramic materials.

Abstract: This invention relates to a new class of novel inorganic-organic hybrid thermosetting polymers and ceramics that are formed from novel linear polymers of varying molecular weight and varying carborane content. These novel organoboron thermoset polymers and ceramics contain an unsaturated cross-linked moiety.

Abstract: The present invention describes a novel method for crosslinking polysilazane polymers having Si--H or N--H bonds. The method comprises mixing the polysilazane with a silazane crosslinker having at least 2 boron functional groups which can react with the Si--H or N--H bonds of the polysilazane and then facilitating crosslinking.

Abstract: Bouncing putty type polysiloxane-boron compounds are modified with the homogeneous addition of from about 1% by weight to about 60% by weight of discrete elastic particles of natural rubber or synthetic rubber to yield an improved putty-like organopolysiloxane-boron composition which exhibits both bounce elasticity and stretch elasticity with the ability of the composition to recover to its initial form when a deforming stress is removed.The modified polysiloxane-boron material has specific uses in exercising and physical therapy applications.

Abstract: A microwave-absorbing material composed of blends of polar icosahedral molecular units with a variety of host matrices, or with polymers with the units covalently bonded in a pendant manner to the polymer chain. Both blends and polymers must impart a high degree of orientational mobility to the units so that they can absorb microwave radiation. These materials employ orientationally mobile, polar icosahedral molecular units as the source of dielectric loss at microwave frequencies. Examples of these units are the polar carboranes (ortho- and meta-carborane), polar carboranes with electronegative and/or electropositive substitutes, and polar "buckminsterfullerenes.

Abstract: This invention relates to a new class of novel inorganic-organic hybrid polymers that are formed from linear inorganic-organic hybrid polymers of varying molecular weight. These new high temperature oxidatively stable thermosetting polymers are formed from linear polymeric materials having repeat units that contain at least one alkynyl group for cross-linking purposes and at least one bis(silyl or siloxanyl)carboranyl group. These novel organoboron thermoset polymers contain an unsaturated cross-linked hydrocarbon moiety.

Abstract: A thermoplastic silicon-containing polymer, which may be a precursor of SiC, and which can be transformed to a thermosetting polymer by copolymerizing it with a thermosetting perhydropolysilazane or polyborosilazane.

Abstract: A carborane siloxane base polymer is formulated into a crosslinked, rubbery high temperature material by incorporating a vinyl group in the backbone of the polymer. By careful control of process variables, the crosslinked polymer allows formation of optically clear and thermally stable adhesive bonds between a number of substrates. While curing is conveniently done at ambient temperature, the adhesive can withstand thermal cycling to over 600.degree. C.

Abstract: This invention relates to a new class of novel linear inorganicorganic hybrid polymers of varying molecular weight that are useful for making high temperature, oxidatively stable thermosets, and these novel linear polymers are in themselves oxidatively stable at high temperatures between 600.degree.-1000.degree. C. These new materials have repeat units that contain at least one alkynyl group and at least one bis(silyl or siloxanyl)carboranyl group within the backbone of these novel linear polymers. These novel linear polymers can be further polymerized to form thermosets and ceramics.

Abstract: The present invention describes a novel method for crosslinking polysilazane polymers having Si--H or N--H bonds. The method comprises mixing the polysilazane with a silazane crosslinker having at least 2 boron functional groups which can react with the Si--H or N--H bonds of the polysilazane and then facilitating crosslinking.

Abstract: Silicon boron nitride ceramics are produced from polyborosilizanes obtained from polymerized Cl.sub.3 Si--NH--BClX wherein X is --Cl or --NH--Si--Cl.sub.3.

Abstract: An improved method for the preparation of very high molecular weight polycarborane siloxane polymers in which each of the reactants is first provided in an ultra-pure state by a series of recrystallization procedures in specific solvents. The reactants are then reacted in the following series of steps by:(a) providing ultra-pure carborane bisdimethyl silanol in dried chlorobenzene solvent, to form a slurry and cooling said slurry to -10.degree..+-.5.degree. C.;(b) adding to said slurry a mixture of ultra-pure dimethylbisureido silane and ultra-pure methylphenylbisureido silane to form a reaction mixture at -10.degree..+-.5.degree. C.

Abstract: Crosslinked random boron/nitrogen preceramic polymers are prepared by reacting (a) admixture of a trihalogenoborane A and a cyclic boron/nitrogen compound B containing recurring structural units of the following general formula (1): ##STR1## in which A is a halogen atom and R is a hydrogen atom, or a hydrocarbyl, organosilyl or hydrogenoorganosilyl radical, with (b) an amino compound C containing at least one --NH.sub.2 group; the resulting polymers are facilely pyrolyzed into boron nitride ceramic materials.

Abstract: Novel composite ceramic materials include a boron nitride matrix and an amount of silicon components compatible therewith; such ceramic materials comprise a core volume having an external sheath layer on an outer face surface thereof, with the majority of said silicon values being distributed throughout the external layer.

Abstract: The invention related to coating compositions containing (poly)borosiloxanes, which contain at least one other component selected from lead, boron and aluminum compounds and talc, and to a process for preparing vitreous protective coatings, which can be applied to a substrate to be protected and then heat-treated to a temperature of at least 500.degree. C.

Abstract: Crosslinked boron/nitrogen preceramic polymers are prepared by reacting (a) admixture of a trihalogenoborane A and a compound B containing at least one dihalogenated boron atom, with (b) an amino compound C containing at least one --NH.sub.2 group; the resulting polymers are facilely pyrolyzed into boron nitride ceramic materials.

Abstract: Organometallic boron/nitrogen polymers, precursors of boron nitride, include recurring structural units of the formulae (I) and (II): ##STR1## wherein X is N-R.sup.3, Y is NR.sup.1 R.sup.2 and Z is N-R, in which R, R.sup.1, R.sup.2 and R.sup.3, which may be identical or different, are each a hydrogen atom, an optionally substituted hydrocarbon radical, or an organosilyl or hydrogenoorganosilyl radical and are prepared by reacting (a) at least one cyclic compound (compound A) containing recurring structural units of the formula (1): ##STR2## wherein A is a halogen atom and R is a hydrogen atom, an optionally substituted hydrocarbon radical, or an organosilyl or hydrogenoorganosilyl radical, with (b) at least one compound including at least one boron atom to which two halogen atoms are directly bonded (compound B), and (c) at least one compound containing at least one NH.sub.2 group compound C); the resulting organometallic polymers are facilely pyrolyzed into boron nitride ceramic materials.

Abstract: Preceramic polymers which have particular utility in providing protective ceramic coatings on carbon/carbon composites, graphite, carbon fibers, and other normally oxidizable materials are prepared by reacting about 0.25-20 parts by weight of a trialkyl- or trialkoxyboroxine in which the alkyl or alkoxy groups contain 1-6 carbons with one part by weight of a poly-silazane to form an organoborosilazane polymer.

Abstract: The present invention relates to a process for the production of an organoborosilicon preceramic polymer of the structure: ##STR1## wherein R.sup.1 is selected from alkyl having from 1 to 10 carbon atoms or phenyl, and x is selected from 0, 1, 2 or 3;which is pyrolyzable to produce a refractory material comprising inorganic compounds of Si, C and B, which process comprises:contacting a silicon containing compound of the structure:(R.sup.1).sub.x --Si (CH.dbd.CH.sub.2).sub.4-x or (R.sup.1).sub.x Si(C.dbd.CH).sub.4-xwith a boron containing compound selected from H.sub.3 B:BH.sub.3, H.sub.3 B:NH.sub.3, BH.sub.3 :N(R.sup.2).sub.3 wherein R.sup.2 is selected from methyl, ethyl, propyl, butyl or phenyl in an inert atmosphere at a temperature of between about 90.degree. and 170.degree. C. for between about 0.1 and 20 hr and recovering the prepolymer. The prepolymer is pyrolyzed to produce a ceramic article useful in high temperature (e.g., aerospace) or extreme environmental applications.

Abstract: Boron-containing ceramics are formed from organoboron preceramic polymers which are carboralated acetylenic polymers. The polymers can be formed by carboralating acetylenic or diacetylenic diols and condensing the diols to form carboralated polyesters. In an alternative process, polydiacetylene formed by the polymerization of diacetylene monomers having conjugated triple bonds are carboralated subsequent to polymerization. A process for obtaining readily soluble polydiacetylenes comprises heating a diacetylene diol in a high boiling solvent.

Abstract: Crosslinked boron/nitrogen preceramic polymers are prepared by reacting (a) admixture of a trihalogenoborane A and a compound B containing at least one dihalogenated boron atom, with (b) an amino compound C containing at least one --NH.sub.2 group; the resulting polymers are facilely pyrolyzed into boron nitride ceramic materials.

Abstract: Preceramic polymers which have particular utility in providing protective ceramic coatings on carbon/carbon composites, graphite, carbon fibers, and other normally oxidizable materials, are prepared by reacting about 0.25-20 parts by weight of a triaryloxyboroxine with one part by weight of a polysilazane to form a organoborosilazane polymer.

Abstract: The invention provides a novel organoborosilicon polymer comprising two types of the recurring monomeric units represented by the general formulas of, one, --SiR.sup.1.sub.2 --CH.sub.2 -- and, the other, --BR.sup.2 --NR.sup.3 --, in which R.sup.1, R.sup.2 and R.sup.3 are each a hydrogen atom or a monovalent hydrocarbon group. Such an organoborosilicon polymer is readily prepared by the thermal decomposition polymerization reaction of an organopolysilane compound and a borazine compound at 250.degree. to 500.degree. C. and useful as a precursor of an inorganic ceramic material or inorganic fibers or as a binder of ceramics.

Abstract: A polyborosiloxane composition to be used for the formation of an insulating layer on an electric conductor comprises (A) a polyborosiloxane produced by the reaction of boric acid, a boric acid derivative, or a halogenated boron with a silane compound and a silicone oil, (B) a silicone resin or a synthetic resin having a nitrogen-containing heterocyclic ring in the molecule, (C) an inorganic filler, and (D) a common solvent for (A) and (B). An insulated electric wire excellent in thermal resistance is obtained by applying the composition to an electric conductor and baking the applied layer of the composition.

Abstract: Silicic acid heteropolycondensates made from hydrolyzable silicic acid derivatives and substituted silanes, optionally with either or both of one or more functional silanes and non-volatile metal oxides or their precursors are made by a known technique, in which the reaction mixture is hydrolyzed and condensed by the action of water and a condensation catalyst, the latter being employed in an amount up to 3% by weight, based upon the weight of the reaction mixture. Improved heteropolycondensates usable as adsorbents and porous membranes can be made by using greater amounts of catalyst, ranging up to 75% by weight, based upon the weight of the reaction mixture. These improved products are very stable in use and are characterized by a pore structure which includes fine pores and coarse pores, whereby products in the form of membranes can have an asymmetrical structure, if desired.

Abstract: A process for producing a heat-resistant and moisture-resistant polyborometallosiloxane, which comprises adding a metal compound and a compound capable of easily forming a complex with the metal compound to an organoborosiloxane, the metal in said metal compound being at least one member of the group consisting of Ti, Zr, V, P, Al, Fe, Cr, Co, Ni, Ge, Sn, As, Mg, Pb and Sb; and heating the resulting mixture to a temperature of 550.degree. C. or lower to bond the metal atom to the silicon atom and/or the boron atom through an oxygen atom.

Abstract: A heat-resistant semi-inorganic compound useful as a material for various at-resistant materials is produced by reacting an organoborosiloxane compound with at least one of aliphatic polyhydric alcohols, aromatic alcohols, phenols and aromatic carboxylic acids at 250.degree. to 450.degree. C. in an inert atmosphere.

Abstract: A process for the production of silicic acid heteropolycondensates, wherein at least one hydrolysable silicic acid derivative; at least one substituted silane; optionally at least one functional silane and/or optionally at least one substantially involatile oxide soluble in the reaction medium or at least one compound forming a substantially involatile oxide are condensed in the presence of at least the quantity of water stoichiometrically required for hydrolysis and optionally in the presence of a condensation catalyst and/or a solvent. The polycondensates are useful in the production of membranes and adsorbents.

Abstract: A method is disclosed for preparing carborane-siloxane polymers directly from carborane which comprises reacting and polymerizing a dilithio salt of a carborane with a bis-halo-ended siloxane. This novel method offers the advantage of eliminating the expensive and time-consuming preparation of certain monomer intermediates of carborane employed in the preparation of carborane-siloxane polymers.

Abstract: A thermostable heterocyclic polymer constituted by monomer units of the general formula ##STR1## where R.sup.1 and R.sup.2 denote an organic radical having from 2 to 1000 carbon atoms;a radical having 2 to 1000 carbon atoms, containing:1 to 1000 atoms of Si,and/or 1 to 1000 atoms of F,and/or 1 to 1000 atoms of Cl,and/or 1 to 1000 atoms of Br,and/or 1 to 1000 atoms of N,and/or 1 to 1000 atoms of S,and/or 1 to 1000 atoms of P,and/or 1 to 1000 atoms of B,and/or 1 to 1000 atoms of O,R.sup.1 and R.sup.2 being either the same or different;R.sup.3 .dbd.NH, CH.sub.2 ;R.sup.4 is a radical which, with R.sup.3 .dbd.NH, may be ##STR2## while with R.sup.3 .dbd.CH.sub.

Abstract: A polyborodiphenylsiloxane having main repeating units of the formula, ##STR1## wherein X is a hydrogen atom or ##STR2## and a weight-average molecular weight of about 800 to about 5,000, and a method of preparing the same, which comprises polycondensing a borodiphenylsiloxanol of the formula, ##STR3## wherein n is zero or one, at a temperature of from about 140.degree. C. to about 400.degree. C. in the absence of a solvent.

Abstract: Elastomeric high molecular weight alternating and random block copolymers are disclosed which comprise blocks of a soft carborane-siloxane elastomer and blocks of a high performance rigid polymer. Methods for preparing such block copolymers are also disclosed. These copolymers exhibit the advantages of high temperature elastomers while allowing the use of conventional thermoplastic fabrication techniques.

Abstract: Carborane-siloxane polymers are conveniently prepared by the polymerization of a carborane disilanol and either a silyl diamine, a ureido-silane, or a silyl dicarbamate. The resulting linear polymers are characterized by relatively high molecular weights and are elastomeric in nature. These gumstocks are compounded with suitable fillers and additives and fabricated into cured elastomeric articles. The carborane-siloxane elastomers exhibit excellent high temperature properties which render them especially useful for a wide variety of applications, such as gaskets, seals, wire and cable insulation and the like.

Abstract: A highly selective method is disclosed for cleaving carboranyl carbon-silicon bonds which comprises contacting either silylated monomeric carboranes or polymers thereof with a nucleophilic cleavage agent and, if desired, in the presence of a protic reagent and recovering the carborane cage intact. This technique is employed in a method for producing the useful meta-carborane in bulk which includes the steps of isomerizing a silylated derivative of ortho-carborane using known techniques to produce the corresponding meta-carborane derivative and then cleaving the carboranyl carbon-silicon bond to form meta-carborane.