Abstract: A curing agent composition for silicone elastomers, comprising an organic tin compound which is solubilized in water with the use of a nonionic surfactant selected from the group consisting of polyoxyethylene sorbitol fatty acid esters and polyoxyethylene sorbitan fatty acid esters and a polyvalent alcohol.

Abstract: The viscosity of hydrocarbon solutions of dialkylmagnesium compounds are reduced by using a reducing agent comprising a defined benzene derivative, a substance produced by reacting such a benzene derivative with magnesium or a dialkylmagnesium compound or a mixture of one of the foregoing with an organoaluminum viscosity reducing agent.

Abstract: Conjugated dienes, in particular 1,3-conjugated dienes, can be polymerized or copolymerized using the catalyst system of this invention to polymers wherein the amount of 1,2-structure contained in the polymer is increased, and polymers can be prepared containing varying amounts of 1,2-structure as desired. Such desirable results can be obtained in accordance with the process of the present invention for polymerizing conjugated diene monomers which comprises the use of a catalyst system which comprises (a) at least one anionic initiator based on lithium, and (b) a modifier composition comprising at least one cyclic acetal of a glyoxal. ##STR1## wherein R and R' are each independently hydrogen, alkyl or aryl groups, and each A is independently an alkylene or an oxyalkylene group.In another embodiment, the catalyst system also contains at least one co-initiator selected from the group consisting of organomagnesium compounds, organoaluminum compounds, or mixtures thereof.

Abstract: The present invention relates to catalyst supports for the polymerization and co-polymerization of alpha-olefins, especially ethylene and propylene, consisting essentially of magnesium chloride, characterized in that these supports occur in the form of spheroidal particles with a mean particle size by mass comprised between 10 and 100 microns and having a narrow particle size distribution, which can be controlled, such that the ratio of the mean diameter by mass to the mean diameter by number of the particles is less than or equal to 3.0, and the process for the preparation of the said supports.

Abstract: An optically active polymer is obtained by polymerizing a vinyl monomer in the presence of a catalyst which comprises an asymmetric ligand compound of the formula (I) or (II): ##STR1## in which R.sub.1 and R.sub.4 each are ##STR2## R.sub.2, R.sub.3, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 each are an alkyl group having 1 to 10 carbon atoms; X is hydrogen, an alkyl group having 1 to 10 carbon atoms or a halogen; and n is a number of 1 to 4; and an anionic initiator to form a complex with said ligand compound.

Abstract: A method of polymerizing silanol-containing organosilicon compounds is provided. Catalysts comprising dioctyl tin dineodeconate lend a unique combination of properties to curable silicone paper release coatings including long bath life, storage stability, low odor, reactivity over a wide temperature range and low release.

Abstract: Titanium trichloride catalytic component and homo- or co-polymerization of .alpha.-olefin by employing the titanium trichloride catalytic component combined with organic aluminium compound, wherein the titanium trichloride catalytic component is prepared by a process comprising the following steps:first step: reducing titanium tetrachloride with an organoaluminum compoundsecond step: treating the resultant reduced solid, which is obtained by the first step, with an organic ether compoundthird step: reacting the treated solid, which is obtained by the second step, with titanium tetrachlorideand whose objects lie in producing polymer of high stereo-regularity advantageously by carrying out reaction of the first step in a single solvent of aromatic compound or a mixed solvent of aliphatic hydrocarbon and aromatic compound.

Abstract: An .alpha.-olefin polymerizing catalytic component which has a support capable of supporting a large amount of titanium and has the titanium work efficiently for polymerizing the .alpha.-olefin; and a method for carrying out homo- or co-polymerization of an .alpha.-olefin by using a catalyst system which consists of the catalytic component and an organo-aluminium compound. The catalytic component is obtained basically by allowing an organo-magnesium compound and a carbon tetrahalide to react with each other in the presence of an organic acid ester; by treating a solid product formed through this reaction with an organic compound of phenol; and then by further treating the product with a halogen-containing titanium compound.

Abstract: The present invention relates to an improved method for the vinylation of pyrrolidone with acetylene in the presence of an alkali metal salt of said pyrrolidone as a catalyst, by the addition of between about 0.2 and about 8 weight-%, based on total feed, of a polyoxyalkylene glycol; a polyoxyalkylene phenol, optionally substituted with an alkyl group; a polyoxyalkylene ether or mixtures thereof; said polyoxyalkylene compound having a number average molecular weight of between about 175 and 2,000 and containing between 4 and 40 oxyethylene and/or oxypropylene units. The invention also pertains to a novel coacting catalyst composition for use in vinylation reactions comprising said alkali metal salt of said pyrrolidone in admixture with said polyoxyalkylene compound.