Abstract: The invention relates to a process for the preparation of a polymer from ethylene, an .alpha.-olefine and optionally a diene, according to which these monomers are polymerized under the influence of a metallocene catalyst, the polymerization taking place in the presence of a catalyst comprising a specific 2-indenyl metallocene, resulting in a bimodal, elastomeric polymer with a molecular weight distribution of more than 3.5, under such reaction conditions that the amount of water in the polymerization medium is smaller than 0.5 ppm.The invention also relates to polymers with a specific branching index.

Abstract: Process for preparing N-pyruvyl-L-proline by reaction of L-proline with methyl pyruvate dimethyl ketal in the presence of an alkali metal alkoxide, subsequent acid hydrolysis and extraction of 1-pyruvyl-L-proline.

Abstract: Process for the purification of 5H-dibenz?b,f!a-zepine, which comprises evaporating 5H-dibenz?b, f!azepine under reduced pressure from a reaction mixture obtained by catalytic dehydrogenation of 10,11-dihydro-5H-dibenz-?b,f!azepine in the 1st step and depositing it as a solid, suspending the deposited product in an aromatic hydrocarbon in the 2nd step and then isolating pure 5H-dibenz?b,f!azepine.

Abstract: Provided is a radiation-curable optical glass fiber coating composition adapted to provide the combination of properties of:(i) enhanced resistance to thermal degradation when suitably cured; and(ii) a viscosity sufficient to provide a surface substantially free-of pitting.The composition is formulated from components including:(A) at least one epoxy silicone monomer or oligomer which is crosslinkable via actinic radiation, or mixture thereof;(B) at least one thermoplastic resin which is substantially unreactive to actinic radiation and which is soluble or dispersible in component (A), said thermoplastic resin being present in an amount to provide said composition with a viscosity suitable for application to an optical glass fiber; and(C) a catalytically effective amount of a photoinitiator for catalyzing the crosslinking reaction of component (A) and which is soluble or dispersible in component (A) or a mixture of said component (A) and said thermoplastic resin.

Abstract: This continuous process for preparing an aqueous mixture of .di-elect cons.-caprolactam and 6-aminocaproic acid and/or 6-aminocaproamide by involves, as the reductive amination step, continuously contacting 5-formylvaleric acid or an alkyl 5-formylvalerate in water as solvent with hydrogen and an excess of ammonia in the presence of a ruthenium on carrier, as a catalyst, wherein the carrier is at least one of titanium oxide or zirconium oxide. The aqueous mixture can be used to prepare .di-elect cons.-caprolactam.

Abstract: A photo-curable resin composition suitable as a material for optical molding. The composition can produce cured products with excellent mechanical strength and high heat resistance. Further disclosed is a process for molding a resin-based mold which provides superior molding dimensional precision and superb repetition durability. The composition contains a monomer component which contains (A) 20-80 wt % of a urethane-bond polyfunctional (meth)acrylate having a number average molecular weight of 1,000 or less and (B) 80-20 wt % of an ethylenically unsaturated monomer containing a cyclic structure and at least one ethylenically unsaturated bond in the molecule and of which the homopolymer has a glass transition temperature of 50.degree. C. or higher; (C) a photopolymerization initiator; and (D) an inorganic filler having an average particle diameter or an average fiber length of 1-50 .mu.

Abstract: A hydroformylation catalyst composition comprising iridium or rhodium and a bidentate organic phosphite ligand wherein the two phosphorus atoms of the phopshite ligand are linked with a 2,2'-dihydroxyl-1,1'-binapthalene bridging group having the following structure (Q): ##STR1## in which R.sup.1 and R.sup.2 are substituents other than hydrogen.

Abstract: Process for the purification of o-phthalaldehyde in which an alcoholic solution containing the crude, unpurified o-phthalaldehyde is adjusted to a pH between 0 and 3 at a temperature between 0.degree. and 60.degree. C., then an alkaline solution is added, and the corresponding dialkoxyphthalan is extracted from the organic phase and purified by distillation and, when required, converted into the purified o-phthalaldehyde by hydrolysis.

Abstract: A process for preparing an aqueous o-phthalaldehyde-glutaraldehyde solution which comprises converting an acetal of the o-phthalaldehyde in a 10 to 60% strength aqueous glutaraldehyde solution into o-phthalaldehyde at room temperature up to 100.degree. C. by eliminating the corresponding alcohol, and removing the eliminated alcohol to give the aqueous o-phthalaldehyde-glutaraldehyde solution.

Abstract: Provided is a radiation-curable primer coating composition, which is adapted to provide a printable primer coating on a polyolefin surface that is functionally resistant to delamination from the polyolefin surface over the temperature range from heat pasteurization temperatures to freezer storage temperatures. The primer composition being formulated from the following components:at least one monomer or oligomer having at least one functional group that polymerizes when exposed to radiation; andan effective amount of at least one zirconate or titanate, or a mixuture of a titanate and zirconate, to increase adhesion of the radiation-cured primer coating to said polyolefin surface.

Abstract: An improved process for preparing alkanones and alkanols by oxidizing an alkane and/or alkene having from 3 to 30 carbon atoms to form an oxidation mixture containing alkylhydroperoxide. A basic, aqueous solution is added to the oxidation mixture so that a separate basic water phase with a pH higher than 8.5 is formed. The alkylhydroperoxide is then decomposed in the presence of a heterogeneous catalyst which contains a metal compound immobilized on a carrier material. The metal of the catalyst is selected from the group consisting of Mn, Fe, Co, Ni, and Cu. The carrier material is stable in the presence of the separate basic water phase.

Abstract: The invention relates to a process for the preparation of star-branched polymers by reaction in the melt of a polymer having at least one hetero atom in the chain with a compound having at least three functional groups. Suitable polymers are for instance polyamides, polyesters, polyurethanes, polyoxyalkyls, polyimines and copolymers of these. Functional groups are for instance amine, carboxyl, hydroxyl, isocyanate and imine groups. The process is very fast and requires no special purification. The process enables star-branched polymers to be prepared which are derived from so-called AABB polycondensates.

Abstract: Process for the preparation of a 1,5-benzothiazepine derivative, or a salt thereof, of formula 1 ##STR1## where R1 represents H, an alkyl group or an alkoxy group and R.sub.2 represents H or a halogen, in which process a propanoic acid derivative of formula 2 ##STR2## where R.sub.1 and R.sub.2 are as defined above and R.sub.3 represents H or an alkyl group is subjected to an intramolecular cyclisation reaction in a non-halogenated solvent in the presence of a carboxylic acid. Preferably, R.sub.2 is H and R.sub.1 is OCH.sub.3. Trichloroacetic acid is preferably used as .alpha.-chlorinated acid. The benzothiazepine obtained on cyclisation can be subjected to an alkylation reaction and/or an acylation reaction to obtain known pharmaceutical products, in particular diltiazem.

Abstract: A plugging compound for the chemical fastening of anchor bolts, threaded sleeves and screws in drill-holes, comprising a reactive resin and--spatially separated therefrom--a curing agent for the resin, includes from 0.0005 to 2% by weight of a piperidinyl or tetrahydropyrrolyl nitroxide as inhibitor in the reactive resin.

Abstract: The invention relates to a solvent-free radiation curable, optical glass fiber coating composition containing:a) a urethane oligomer having a functional group capable of polymerization in the presence of actinic radiation, with an average functionality of at least about 1.2, having a vinyl addition polymer as backbone.b) a urethane compound having a functional group capable of polymerization in the presence of actinic radiation, with an average functionality of at least about 1, containing an organic moiety having about 5 or more carbon atoms as backbone.c) a reactive diluent.Furthermore, the invention relates to a solvent-free method for producing a solvent-free, radiation curable urethane oligomer composition.

Abstract: The invention relates to a method for the selective hydrogenation of a dinitrile compound in the presence of a catalyst which comprises a metal of group 8 of the periodic system of the elements, the catalyst comprising a zeolite having a pore diameter of between 0.3 and 0.7 nm. The zeolite preferably has a structure chosen from the structures: ABW, AEI, AFT, ANA, ATN, ATV, ATT, AWW, BIK, CAS, CHA, DDR, EAB, EDI, ERI, GIS, JBW, KFI, LEV, LTA, MER, NAT, PHI, RHO, THO, YUG.

Abstract: Provided is a radiation-curable, optical glass fiber coating composition containing at least one radiation-curable oligomer or monomer, and at least one chromophoric indicator selected so as to be susceptible to destruction of its chromophoric characteristic upon exposure to radiation and present in an amount which becomes substantially colorless when exposed to a level of radiation sufficient to cure said radiation-curable, optical glass fiber coating composition, wherein said at least one chromophoric indicator has a color which is distinguishable from a base color of said radiation-curable, optical glass fiber coating composition in cured form. The invention also provides a method of making the coating composition. The invention further provides a coated optical glass fiber and a method of making a coated optical glass on a fiber drawing tower. Also provided is a cable and telecommunications system.

Abstract: Process for producing a steam-sterilizable porous polyolefin membrane with a porosity of at least 20% and a shrinkage of 4% at most in every direction in the plane of the membrane in steam sterilization by subjecting a porous stretched film to a shrink treatment at a temperature equalling at least the sterilization temperature, but below the melting point of the polyolefin, in which treatment the permitted shrinkage is at least 95% of the critical shrink factor of the film in every direction in the plane of the film and a membrane of polyethylene with an intrinsic viscosity of at least 5 dl/g, steam-sterilizable at 134.degree. C.

Abstract: The present invention relates to a process for treating polyamide-containing carpet waste by extracting the polyamide from the carpet waste with an extraction agent containing an aliphatic alcohol. The separated polyamide can then be recovered from the extract and recycled for further use. In addition, carpet waste containing two polyamides can be treated in accordance with the present invention so as to separately recover each polyamide. The process according to the present invention provides a high yield of the polyamide. The presence of other constituents normally present in carpets does not interfere with the separating and recycling of the polyamide.

Abstract: An improved method for the selective oxidation of alkyl-5-valerate to monomethyl adipate (e.g., methyl-5-valerate to monomethyl adipate). By performing the air oxidation at high pressure (i.e.,>10 bars air and preferably 35 to 65 bars) and relatively moderate temperature (i.e., 20 to 120.degree. C.) in the absence of a catalyst, commercial rates of conversion can be sustained at optimum selectivity to the desired product. Such a high pressure process is particularly amenable to continuous operating the oxidation reactor at optimum selectivity at the expense of conversion per pass followed by product separation and recycle of reactants.