Abstract: The invention relates to a star-shaped branched polyamide that has a high thermal stability and can be produced in existing production facilities for the corresponding linear polyamide. This is achieved by allowing the polyamide branches, at least three, to be formed from a multifunctional core having functional groups chosen from the group comprising amine and carboxyl groups, the amine or carboxyl groups being bound to an acyclic compound in which branching occures, if it is branched, at a carbon atom, or via an acyclic chain to a heterocyclic compound showing point symmetry.The process for the preparation is carried out under the conditions of the preparation of the corresponding linear polyamide. It proves to be possible to obtain, after shorter polymerization times, a product with mechanical properties that are comparable with those of the linear polyamide after significantly longer polymerization times.

Abstract: The present invention relates to a coating composition characterized in that an acetylacetonate having as the central metallic atom thereof Fe, Al, Sn or Ti, or a perchlorate, or a carboxylic acid or an anhydride thereof, and an acetylacetonate having as the central metallic atom thereof Li, Cu or Mn are incorporated in combination as curing catalysts; and to a composite structure characterized in that an antireflection film is provided on the surface of a coating film that is obtained from the above composition.According to the present invention, a coating film which is drastically improved in transparency, optical properties and durability can be obtained. Moreover, this coating film has both high adhesion to an antireflection film made from an inorganic material, and durability. Further, according to the present invention, the pot life of a coating liquid when preserved at room temperature can be prolonged to 3 weeks or longer.

Abstract: Polyesters are prepared by the reaction of a dicarboxylic acid, preferably an aromatic acid such as terephthalic acid, or an ester or ester-forming derivative thereof with a dihydroxy compound such as 1,4-butanediol in the presence of a catalyst composition comprising the combination of a titanium-based compound such as tetra-n-butyl titanate, a zirconium-based compound such as zirconium tetrakis(2,4-pentanedionate) and a phosphate-forming compound such as sodium dihydrogen phosphate. This catalyst composition affords polyesters having relatively low melt viscosities in short reaction times and does not produce an excessive level of undesirable reaction by-products.

Abstract: Linear, thermoplastic, elastomneric copolymers of carbon monoxide and olefinically unsaturated compounds have an alternating sequence of repeating units and an average molecular weight Mw of the copolymers of from 80,000 to 1,200,000, binary, linear, alternating carbon monoxide/ethylene copolymers being excluded.

Abstract: Hydroxyl-containing polyurethanes I are composed essentially ofa) a diisocyanate of 6 to 30 carbon atoms (component II),b) a component III comprising.alpha.) an aliphatic diol of 2 to 20 carbon atoms or.beta.) an aromatic-aliphatic or aromatic-cycloaliphatic diol of 8 to 30 carbon atoms having nonphenolic hydroxyl groups as hydroxyl groups of the diol andc) a polyhydric alcohol having at least 3 hydroxyl groups, 3 to 18 carbon atoms and nonphenolic hydroxyl groups as hydroxyl groups of the alcohol (component IV),the amounts of components II to IV being such that the total number of nonphenolic hydroxyl groups is from 1.1 to 5.0 per isocyanate group of II.The polyurethanes can be used as binders or binder components for pigment-containing coatings, in particular for the production of magnetic recording materials.

Abstract: An ethylene terephthalate/ethylene-2,6-naphthalene dicarboxylate copolymer comprising 2,6-naphthalenedicarboxylic acid in an amount of 5 to 20 mol % of the total of all dicarboxylic acid components. This copolymer contains Mn, Mg and Co derived from catalysts and P derived from a phosphorus compound as a stabilizer whose amount is controlled to a specific value and is suitable for use as a raw material for molding a bottle having good color (achromatic) and transparency.

Abstract: An oxidant solution for synthesizing a heat-resistant electroconductive polymer, composed of a solution of a non-protonic organic solvent and an oxidant of the organic compound iron salt expressed by the following formula:Fe.sup.3+O [(X)L--(M)m--(Y.sup.-)n]pH.sup.

Abstract: An organopolysiloxane composition for viscous fluid couplings permits little torque variation even when used at a high temperature for an extended period of time. The organopolysiloxane composition comprises an organopolysiloxane liquid with a viscosity of 100 to 1,000,000 sq. mm/s and a platinum compound in an amount such that the amount of platinum metal relative to the liquid is 0.1 to 1,000 ppm. The organopolysiloxane liquid is typically a trimethylsiloxy-endblocked polydimethylsiloxane.

Abstract: The invention relates to a thermoplastically processible molding material with a two-phase matrix of a partially aromatic copolyamide and an aliphatic polyamide or copolyamide containing permanently magnetic or magnetizable fillers, as well as to a method for producing this molding material and using it for producing molded parts.

Abstract: Alkoxy-functional room temperature vulcanizing (RTV) compositions, curable in the presence of moisture, comprising polymers containing on average at least 1.2 alkoxysilyl chain terminations per molecule, a tetraalkoxytitanium compound containing on average greater than 90 mole percent of the alkoxy groups as tertiary amyloxy groups, a filler, and an alkoxysilane. The addition of these components in amounts to satisfy defined molar ratios provide alkoxy-functional RTV compositions having both improved storage stability and improved green strength upon curing.

Abstract: The present invention provides for a two component room temperature vulcanizable silicone compositions wherein both components may be used in approximately equal weights or volumes thereby minimizing the effects of mixture ratio errors.

Abstract: The present invention provides novel vinyl containing organopolysiloxane elastomers which possess excellent low compression set and heat aging characteristics and which can advantageously be formulated into liquid silicone elastomer moldable compositions.

Abstract: A silicone rubber composition that cures into a highly flame-retardant silicone rubber with excellent electrical insulation characteristics and that does so without sacrificing mechanical strength. The silicone rubber composition comprises:(A) polyorganosiloxane described by average formula R.sub.a SiO.sub.(4-a)/, where R denotes substituted and unsubstituted monovalent hydrocarbon groups and a is a number from 1.95 to 2.05 and having at least 2 silicon-bonded alkenyl groups in each molecule;(B) microparticulate silica;(C) the reaction mixture of(a) a platinum compound and(b) a compound containing a carbon-carbon double bond and a carbon-carbon triple bond;(D) curing agent, and optionally(E) a triazole compound.

Abstract: A process for the preparation of a copolymer of carbon monoxide with an olefinically unsaturated compound in which a powder of a copolymer of carbon monoxide with an olefinically unsaturated compound is suspended in a liquid diluent. The suspension is contacted with a catalyst composition which is soluble in the diluent and which is based on a Group VIII metal and a bidentate ligand. The catalyst composition is used in such a quantity that in the polymerization mixture more than 0.1 mmoles of the Group VIII metal is present per liter of liquid phase.

Abstract: A catalyst composition for use in the preparation of a polyester or copolyester is disclosed. The catalyst composition comprises the combination of (a) a titanium-based compound or zirconium-based compound, and (b) a lanthanide series compound or hafnium. Various titanium-based compounds and lanthanide-based compounds are described. Moreover, in some embodiments, the catalyst composition may further comprise a phosphate-forming compound. Another aspect of this invention is an improved method for preparing a polyester, based, for example, on the two-stage process of ester interchange and polycondensation. The method is carried out in the presence of the catalyst composition described above.

Abstract: A copolyester for molding a bottle which comprises 95 to 87 mol % of naphthalenedicarboxylic acid and 5 to 13 mol % of terephthalic acid as dicarboxylic acid components and a diol component consisting essentially of ethylene glycol, has an acetaldehyde content of 20 ppm or less and an intrinsic viscosity of 0.40 to 0.85 dl/g, and produces acetaldehyde in an amount of 30 ppm or less when the copolyester is kept molten with stirring at 300.degree. C. for 5 minutes.

Abstract: A crosslinked polysiloxane dispersion comprising a siloxane polymer, polymer mixture, or polymer/solvent mixture, capable of crosslinking via condensation, addition or free radical reactions, and having a viscosity of greater than 5000 mPa.s but less than 500,000 mPa.s, if required, 0.1 to 10 weight parts of a crosslinking agent, and, if required, depending on the nature of the catalyst and silicon cure system, 0.000001 to 10 weight parts of a catalyst, 0.5 to 10 weight parts of a surfactant or surfactant mixture, and 0.5 to 25 weight parts water per 100 weight parts siloxane polymer. Optionally, adhesion promoters, pigments, reinforcing or non-reinforcing fillers, silicone resins, stabilizers, freeze/thaw additives, etc. may also be added to the dispersion.

Abstract: A liquid silicone rubber composition that prior to its cure has a suitable fluidity and excellent moldability and that cures into a highly flame retardant silicone rubber molding with excellent electrical properties. The liquid silicone rubber composition comprises(A) polyorganosiloxane,(B) microparticulate silica,(C) aluminum hydroxide powder,(D) zinc carbonate powder,(E) polyorganohydrogensiloxane,(F) benzotriazole,(G) the reaction mixture of(a) a platinum compound and(b) 3,5-dimethyl-1-hexyn-3-ol, and(H) hydrosilylation reaction catalyst.

Abstract: The present invention provides a novel poly(1,3-propylene terephthalate), which is prepared from reacting terephthalic acid and 1,3-propanediol in the presence of an effective catalytic amount of ethylene glycol titanate to undergo esterification to form a monomer; and polymerizing the monomer in the presence of an effective catalytic amount of antimony acetate to obtain poly(1,3-propylene terephthalate). The obtained poly(1,3-propylene terephthalate) (PPT) has an intrinsic viscosity (IV) of 0.65-0.91 dl/g, acid number (--COOH amount) of less than 40 meq/kg, and L*>60. Without adding a pigment, the yellowness b* of PPT is below 9, even below 5. The yellowness b* of PPT even reaches below 3 when a pigment is incorporated.

Abstract: The present invention are dielectric black particles for use in electrophoretic images displays, electrostatic toner or the like, and the corresponding method of manufacturing the same. The present invention black particles are latex particles formed by a polymerization technique, wherein the latex particles are stained to a high degree of blackness with a metal oxide.

Abstract: A container formed from a copolyester composition which comprises a copolyester containing 80 to 95 mol % of terephthalic acid and 20 to 5 mol % of 2,6-naphthalenedicarboxylic acid as acid components and ethylene glycol as a glycol component, wherein catalyst metals of a calcium compound, magnesium compound and cobalt compound are contained in the copolyester in such amounts that satisfy all the following expressions (1) to (4) based on the total of the whole acid component of the polymer:0<Ca.ltoreq.35(mmol %) (1)0<Mg.ltoreq.80(mmol %) (2)40.ltoreq.(Mg+Ca).ltoreq.90(mmol %) (3)0.ltoreq.Co.ltoreq.15(mmol %) (4).The above polyester container is excellent in gas barrier property, ultraviolet light screening property, hot water resistance, hue and transparency, is not whitened and has a small content of aldehyde.

Abstract: A polyester comprises a dicarboxylic acid moiety comprising terephthalic acid or its ester forming derivative and a diol moiety comprising ethylene glycol and 1,4-cyclohexanedimethanol of 10 to 60 mol % based on the whole diol moiety, the intrinsic viscosity of the polyester being 0.68 to 0.95 dl/g, the "b" value of color tone of the produced pellets of polyester being -5 to 5, the number of the carboxylic acid terminals being not more than 30 eq/ton, and the sum of the numbers of the vinyl terminals, the vinylidene terminals and the methylcyclohexene terminals being not more than 25 eq/ton.

Abstract: The present invention is addressed a formulation curable in the presence of an amine and containing one or more of a polyol or polymercapto resin, a polyisocyanate cross-linking agent, optionally a organic vehicle, and a tin catalyst complex. The present invention comprises the catalyst complex being formed from a metal catalyst and a complexing sulfonic acid in an equivalent ratio of complexing sulfonic acid to metal catalyst of greater than 2:1. Such curable formulation may be compounded into a coating, an adhesive (including a structural adhesive), a caulk, a foundry binder, or the like. Besides having excellent shelf life, long periods of open time are experienced with the novel catalyzed formulation. However, upon exposure to an amine, the catalyst complex becomes activated and then is effective to catalyze the NCO--OH reaction or the NCO--SH reaction to effect cure of the formulation.

Abstract: A highly storage-stable room-temperature-curable organopolysiloxane composition that cures to yield a product whose surface resists staining and that does not cause staining of the neighboring regions of the substrate in contact with said cured product. The organopolysiloxane composition is made from a polydiorganosiloxane, an imidazolinyl-functional organosiloxane, a filler, and a crosslinking compound which is a Si-bonded hydrolyzable group-containing organosilane or organosiloxane oligomer.

Abstract: A curable organosiloxane composition useable as a silicone die attach adhesive, an electrically conductive silicone rubber composition each comprising a composition that cures through both addition and condensation reactions, that will not impair wire bondability to a semiconductor chip or lead frame after the semiconductor chip has been bonded to a substrate or package; and semiconductor devices in which the semiconductor chip is bonded to its substrate or package using the curable organosiloxane composition and in which the semiconductor device that evidences high reliability by virtue of the use of the curable organosiloxane composition.

Abstract: The present invention provides a method of synthesizing polypropylene terephthalate with no more than 5 ppm acrolein and no more than 3 ppm allyl alcohol. The method comprises direct esterification of terephthalic acid with 1,3-propanediol in the presence of 30 to 200 ppm titanium in the form of an inorganic esterification catalyst containing at least 50 mol % TiO.sub.2 precipitate, blocking the esterification catalyst after esterification by adding 10 to 100 ppm phosphorus in the form of a phosphorus-oxygen compound, and then performing precondensation and polycondensation in the presence of 100 to 300 ppm antimony in the form of a conventional antimony polycondensation catalyst and optional conventional coloring agent.

Abstract: The present invention relates to a curable silicone composition comprising (A) an alkenyl-functional organopolysiloxane, (B) a siloxane-modified acrylic polymer, (C) an organohydrogenpolysiloxane, and (D) a hydrosilylation reaction catalyst. The curable silicone compositions of this invention cure into a highly oil-resistant and highly wear-resistant coating and are useful as base compositions for inks for silicone moldings, and are also useful for imparting release against pressure sensitive adhesives while maintaining a degree of printability.

Abstract: CVE polyorganosiloxane compositions crosslinkable into silicone elastomeric state, well suited for the protective coating of a wide variety of substrates and supports, notably vehicular airbags, are improvedly adhered thereto by including in said CVE silicone compositions an adhesiveness promoter comprising (1) at least one alkoxylated organosilane containing, per molecule, at least one C.sub.2 -C.sub.6 alkenyl radical, (2) at least one organosilicon compound containing at least one epoxy radical, and (3) at least one chelate of metal M and/or a metal alkoxide having the formula: M(OJ).sub.n, wherein n is the valency of M, J is a linear or branched C.sub.1 -C.sub.8 alkyl radical, and M is selected from among Ti, Zr, Ge, Li, Mn, Fe, Al and Mg.

Abstract: Processes for making storage-stable epoxy-capped polyetherester resins are disclosed. In one process, a polyetherester resin is first made by inserting a carboxylic acid derivative into a polyether. Reacting the resin with a capping agent gives an intermediate resin with a reduced content of free carboxylic acid groups. Finally, the intermediate resin reacts with an epoxy compound in the presence of a finishing catalyst under conditions effective to give an epoxy-capped resin. The resins have low weight average molecular weights (less than about 8000), narrow molecular weight distributions (less than 6), and low viscosities, making them an excellent choice for low-VOC formulations. The finishing catalyst helps to minimize resin viscosity drift and improves shelf stability. Curing the resins with a vinyl monomer gives thermosets with an excellent balance of physical properties, including excellent water resistance.

Abstract: Finishing agents comprise the combination of an alkoxysilane surface active agent, a silanol condensing catalyst, and a nonaqueous liquid or solid medium, or the combination of an alkoxysilane surface active agent, an acid catalyst and a liquid or solid medium. In the latter embodiment, it is preferred that at least one of the alkoxysilane surface active agent and the acid catalyst be microencapsuled. The finishing agent permits formation of chemically adsorbed protecting films. Such protecting films are used for substrates of such equipments as electronics products, electric domestic products, automobiles, industrial equipment, mirrors, lenses for glasses and the like. The protecting films have a durability and heat, weather and abrasion resistance, and also water and oil repellent properties.

Abstract: The present invention is hydrophobic organosilicate-modified silica gels and a method for their preparation. The method comprises two steps, where in the first step an organosilicate-modified silica hydrosol is heat treated in the presence of a strong mineral acid at a pH less than about pH 1 to form an organosilicate-modified silica hydrogel. In the second step the organosilicate-modified silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the organosilicate-modified silica hydrogel thereby forming a hydrophobic organosilicate-modified silica hydrogel having a surface area within a range of about 100 m.sup.2 /g to 750 m.sup.2 /g as measured in the dry state.

Abstract: A process for the preparation of copolymers of carbon monoxide with an olefinically unsaturated compound comprising copolymerizing the monomers in the presence of a catalyst composition based upon(a) a salt of a Group VIII metal, and(b) a cation which is selected from cationic oxidants and cations of the general formulae R.sub.n H.sub.4-n N.sup.+, R.sub.m H.sub.3-m C.sup.+ and R.sub.m H.sub.3-m O.sup.+, wherein n is 0, 1, 2, 3 or 4, m is 2 or 3, and R represents a hydrocarbyl group and/or two or three of R together with the atom carrying a positive charge represent a ring structure, on the understanding that when n is 3, at most two of R together with nitrogen represent a heterocyclic ring structure, and when n is 4, three of R together with nitrogen represent an aromatic heterocyclic ring structure.

Abstract: This invention relates to a process of producing a moldable polyethylene terephthalate or modified polyethylene terephthalate having an inherent viscosity greater than 0.6 dL/g comprising reacting the diacid component with the diol component such that a combination of a titanium-based catalyst and a phosphorus-based catalyst is used during the polycondensation steps.

Abstract: A process to prepare a high molecular weight aliphatic polyester is disclosed, where a catalyst is portionwise added, and a radical scavenger is also added. The aliphatic polyester obtained has a number average molecular weight larger than 70,000.

Abstract: A zeolite polycondensation catalyst comprising an alkali- or alkaline earth metal aluminum silicate zeolite having an original water content of 12 to 30 weight % and a solubility, measured at 260.degree. C., in an esterification mixture consisting essentially of bis(hydroxy ethylene)terephthalate, of over 8.0 weight %, and an average particle size of less than 1.0.mu.. The present invention is also a process for the production of polyester using this catalyst.

Abstract: A process for the preparation of a linear alternating copolymer of carbon monoxide with ethene and another olefinically unsaturated compound (A) wherein a copolymer of which the molar ratio (r.sub.1) of the monomer units originating in the olefinically unsaturated compound A to the monomer units originating in ethene is in the range of from 1:100 to 1:3, is prepared by contacting the monomers in the presence of a liquid diluent with a catalyst composition which is based on(a) a source of a Group VIII metal, and(b) a bidentate ligand of the general formula R.sup.1 R.sup.2 M.sup.1 --R--M.sup.2 R.sup.3 R.sup.4 (I) wherein M.sup.1 and M.sup.2 independently represent a phosphorus, arsenic or antimony atom, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently represent unsubstituted or substituted hydrocarbyl groups and R represents a bivalent bridging group which consists of three atoms in the bridge of which the middle atom is a carbon or silicon atom which carries two monovalent substituents R.sup.5 and R.sup.

Abstract: An adhesive composition which comprises:(A) 100 parts by weight of a polyorganosiloxane represented by the formula (I): ##STR1## (wherein R.sup.1 s may be the same or different from each other and each represent a monovalent hydrocarbon group or a halogen-substituted hydrocarbon group; and n is a positive integer);(B) 0.5 to 10 parts by weight of a tetraalkoxysilane represented by the following formula:R.sup.2.sub.a Si(OR.sup.3).sub.4-a (II)(wherein R.sup.2 represents an alkyl group having 1 to 3 carbon atoms, a phenyl group or a vinyl group; R.sup.3 represents an alkyl group having 1 to 4 carbon atoms or an alkoxy-substituted alkyl group having 3 to 6 carbon atoms; and a is 0 or 1),or a partially hydrolyzed condensate thereof; and(C) 0.1 to 15 parts by weight of a trialkoxysilane represented by the formula (III):R.sup.4 (R.sup.5).sub.b Si(OR.sup.6).sub.3-b (III)(wherein R.sup.4 represents a substituted or unsubstituted aminoalkyl group; R.sup.

Abstract: A process for preparing a polyketone is disclosed. This comprises polymerising together carbon monoxide, ethylene and optionally at least one C.sub.3 to C.sub.10 alpha-olefin in the presence of a solvent and a catalyst composition derivable from a palladium salt, an anion which is either non-coordinating or weakly coordinating to palladium and a phosphate ligand characterised in that the solvent is either a C.sub.4 to C.sub.10 tertiary aliphatic alcohol or a mixture of a C.sub.4 to C.sub.10 tertiary alcohol and up to 80% by volume of an aprotic solvent. The preferred tertiary alcohols are tertiary butyl alcohol and tertiary amyl alcohol. The aprotic solvents can be an aliphatic ketone or cyclic aliphatic ether; preferred aprotic solvents are THF and 1,4-dioxane.

Abstract: Disclosed are compositions which can be used to form tamper-proof coatings on electronic devices. These compositions contain a silica precursor resin and a filler which reacts in an oxidizing atmosphere to liberate heat. Such compositions form coatings which, when oxidized by techniques such as plasma etching, wet etching, or cross-sectioning, liberate heat which causes destruction of the underlying substrate and, thus, inhibits further examination.

Abstract: A room temperature-curable organopolysiloxane composition with excellent extrudability and self-extinguishing properties is made from a hydroxyl endblocked polydiorganosiloxane, aluminum hydroxide having an average particle size not exceeding 50 micrometers, colloidal calcium carbonate, platinum or a platinum compound, and a crosslinking silane or siloxane having at least three hydrolyzable groups.

Abstract: The invention relates to a dendritic macromolecule with branches prepared from halogen cyanide units composed of a monohalogenated hydrocarbon compound comprising 3-50 carbon atoms and at least one cyanide group, the halogen and the cyanide group being separated from one another by at least 3 carbon atoms. The invention also relates to a process for the preparation of a dendritic macromolecule, comprising a core and at least one branch emanating from the core, characterized in that the process comprises the steps a) through c):a) substantially every functional group of the core molecule is reacted with monomeric halogen cyanide unitsb) substantially every incorporated cyanide group is reduced to an aminec) substantially every amine group is reacted with monomeric halogen cyanide units,steps b) and c) being conducted alternately.

Abstract: A process is disclosed whereby a polymeric resin (containing ester and/or carbonate bonds) is readily converted into a resin having a modified molecular structure. Accordingly, a polycyclic carbonate (a monomer or oligomer) is transesterified with the polymer resin in the melt, preferably upon extrusion, optionally in the presence of a catalyst. Significantly, the cyclic carbonates are, by the inventive process, inserted into the structure of the polymer, effecting branching of the molecular structure, a branching which manifests itself in the modified properties of the resin.

Abstract: A catalyst composition which is based upon(a) a source of nickel cations, and(b) a bidentate ligand of the general formula R.sup.1 R.sup.2 M.sup.1 --R--M.sup.2 R.sup.3 R.sup.4 (I) wherein M.sup.1 and M.sup.2 represent independently phosphorus, nitrogen, arsenic or antimony, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 represent independently optionally polar substituted hydrocarbyl groups on the understanding that at least one of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 represent a substituted aryl group, and R represents a bivalent bridging group of which the bridge consists of at most two bridging atoms, and a process for the preparation of copolymers of carbon monoxide and an olefinically unsaturated compound comprising ontacting the monomers in the presence of the said catalyst composition.

Abstract: In a semiconductive silicone elastomer composition comprising an organopolysiloxane containing at least two aliphatic unsaturated hydrocarbon groups attached to a silicon atom, an organohydrogenpolysiloxane containing at least two hydrogen atoms attached to a silicon atom, and a conductive agent, the conductive agent consists of 1-10 wt % of conductive carbon and 99-90 wt % of a conductive filler having a volume resistivity of 10.sup.1 -10.sup.8 .OMEGA.-cm other than the conductive carbon. The conductive agent is blended in an amount of 20-60 wt % of the entire composition. The composition having the conductive agent uniformly dispersed therein yields a semiconductive silicone elastomer having a volume resistivity of 10.sup.5 -10.sup.10 .OMEGA.-cm with a dispersity of 1 to 10.

Abstract: The present invention provides an addition-curable composition containing an inorganic, organic or organometalic compound of palladium in an amount effective to reduce the amount of hydrogen gas evolved in the reaction of the composition. A preferred embodiment is a dental impression material composition comprising: (a) an addition-curable compound; (b) a crosslinker; (c) a platinum-containing catalyst; and (d) a palladium compound. This generally provides a positive gypsum model of, for example, a dental impression that is substantially free of pits.

Abstract: A process for the copolymerization of carbon monoxide with an olefinically unsaturated compound in which a solid particulate material is suspended in a liquid diluent in which the polymer to be produced forms a suspension. The monomers are contracted in the liquid diluent containing the suspended solid particulate material with a catalyst composition which is based on a source of a Group VIII metal and a boron hydrocarbyl compound.

Abstract: A primer composition for the treatment of a tooth surface, which comprises a) at least one metal compound selected from the group consisting of an iron compound, a copper compound and a cobalt compound, b) a polymerizable monomer having an acidic group, and c) water or water and an organic solvent miscible with water; and a method of forming an adhesive layer on a tooth surface, which comprises applying this primer composition to the tooth surface and then applying a curable composition containing trialkylborane or partial oxide thereof and a polymerizable monomer. According to the present invention, both the enamel and the dentin of a tooth can be simultaneously surface-treated without acid treatment or washing with water, and adhesion dental treatment can be reliably carried out by a simple operation without causing pains on a patient.

Abstract: A process for the copolymerization of carbon monoxide with an olefinically unsaturated compound in which the monomers are contacted in the presence of a liquid diluent and a protic compound with a catalyst composition which is based on a source of a Group VIII metal and a hydrocarbylborane. A stirring power is transmitted to the polymerization mixture of at least 0.25 kW/m.sup.3.

Abstract: CVE polyorganosiloxane compositions crosslinkable into silicone elastomeric state, well suited for the protective coating of a wide variety of substrates and supports, notably vehicular airbags, are improvedly adhered thereto by including in said CVE silicone compositions an adhesiveness promoter comprising (1) at least one alkoxylated organosilane containing, per molecule, at least one C.sub.2 -C.sub.6 alkenyl radical, (2) at least one organosilicon compound containing at least one epoxy radical, and (3) at least one chelate of metal M and/or a metal alkoxide having the formula: M(OJ).sub.n, wherein n is the valency of M, J is a linear or branched C.sub.1 -C.sub.8 alkyl radical, and M is selected from among Ti, Zr, Ge, Li, Mn, Fe, Al and Mg.

Abstract: A cobalt/aluminum catalyst is used in the polymerization reaction to form polyesters of terephthalic acid and an ethylene glycol.