Abstract: A covalently crosslinked absorbent graft copolymer is provided comprised of a water-soluble base monomer and a water-soluble or water-dispersible macromer. In a preferred embodiment, the water-soluble base monomer comprises a carboxylic hydroxyalkyl ester monomer and the water-soluble macromer comprises an ethoxylated or propoxylated hydroxyalkyl (meth)acrylate. The covalently crosslinked absorbent graft copolymer exhibits desirable water absorbency and water vapor transmission rates and may be used in a variety of medical applications such as a wound dressing, medical adhesive or biomedical electrode.

Abstract: Tris-(cyanato)-s-triazines having the formula: ##STR1## wherein R.sub.1 and R.sub.2 independently of one another, represent halogen, in particular, chlorine, bromine and fluorine, hydrogen or a methyl group or ethyl group. The monomers disclosed always provide an anisotropic network. Methods for the polycyclotrimerization of polycyanates to obtain the inventive compounds are also disclosed.

Abstract: Catalyst system comprising an ionic metallocene derived from a transition metal, a catalytic solid containing an element of group IVB, magnesium and a halogen, and an aluminium derivative. Process for preparing this catalyst system, according to which a mixture of a neutral metallocene and of the catalytic solid is prepared, the mixture thus obtained is placed in contact with an aluminium derivative and an ionizing agent is added to it. Process for (co)polymerization of an olefin, according to which a mixture of the neutral metallocene and of the catalytic solid is prepared, the mixture thus obtained is placed in contact with an aluminium derivative and the olefin, and the ionizing agent is added to it.

Abstract: A complex comprises organoborane and polyoxyalkylenepolyamine. The complexes are useful in systems for initiating the polymerization of acrylic monomer, which systems further include an amine reactive compound. Polymerizable acrylic monomer compositions useful as adhesives can be prepared.

Abstract: In accordance with the present invention there is provided a process for preparing a cyclopentadienyl-type ligand comprising reacting an alkali metal compound and a fulvene-type compound to form a dianion, and then reacting the dianion with water. In accordance with another embodiment of the present invention a process for preparing a metallocene compound is provided comprising reacting an alkali metal compound, a fulvene-type compound, and a transition metal-containing compound. In another embodiment, the metallocene compound and a cocatalyst are combined to form a catalyst system. Other aspects of the invention include the cyclopentadienyl-type ligands, metallocene compounds, and catalyst systems thus produced and polymerization processes employing the catalyst systems.

Abstract: Methods of preparing carbene compounds of the formula ##STR1## are disclosed wherein M is Os or Ru; R and R.sup.1 are independently selected from hydrogen and a functional group selected from the group consisting of C.sub.2 -C.sub.20 alkenyl, C.sub.2 -C.sub.20 alkynyl, C.sub.1 -C.sub.20 alkyl, aryl, C.sub.1 -C.sub.20 carboxylate, C.sub.2 -C.sub.20 alkoxy, C.sub.2 -C.sub.20 alkenyloxy, C.sub.2 -C.sub.20 alkynyloxy, aryloxy, C.sub.2 -C.sub.20 alkoxycarbonyl, C.sub.1 -C.sub.20 alkylthio, C.sub.1 -C.sub.20 alkylsulfonyl or C.sub.1 -C.sub.20 alkylsulfinyl; each optionally substituted with C.sub.1 -C.sub.5 alkyl, a halogen, C.sub.1 -C.sub.5 alkoxy or with a phenyl group optionally substituted with a halogen, C.sub.1 -C.sub.5 alkyl or C.sub.1 -C.sub.5 alkoxy; X and X.sup.1 are independently selected from any anionic ligand; and L and L.sup.

Abstract: A polymerizable compound represented by Formula (I): ##STR1## where X is a hydrogen atom or a methyl group; Y and Z are independently a hydrogen atom or a fluorine atom; l is an integer of 0 to 14; m and n are independently an integer of 0 or 1; R is represented by Formula (II), (III), or (IV); and when m=1, l.gtoreq.

Abstract: The invention relates to a method for preparing polyolefins by polymerizing an olefin with a procatalyst composition prepared by bringing together MgCl.sub.2, a lower alcohol, a titanium compound and a phthalic acid ester. The invention also relates to a polyolefin obtained by polymerizing an olefin in the presence of a procatalyst prepared by bringing together MgCl.sub.2, a lower alcohol, a titanium compound and a phthalic acid ester, as well as to a procatalyst composition suitable for the preparation of a large-pore polyolefin, which composition has been prepared by bringing together MgCl.sub.2, a lower alcohol, a titanium compound and a phthalic acid ester.

Abstract: A metallocene catalyst system for the polymerization of .alpha.-olefins to yield stereospecific polymers including syndiotactic, and isotactic polymers. The catalyst system includes a metal and a ligand of the formula ##STR1## wherein: R.sup.1, R.sup.2, and R.sup.3 are independently selected from the group consisting of hydrogen, C.sub.1 to C.sub.10 alkyl, 5 to 7 membered cycloalkyl, which in turn may have from 1 to 3 C.sub.1 to C.sub.10 alkyls as a substituent, C.sub.6 to C.sub.15 aryl or arylalkyl in which two adjacent radicals may together stand for cyclic groups having 4 to 15 carbon atoms which in turn may be substituted, or Si(R.sup.8).sub.3 where R.sup.8 is selected from the group consisting of C.sub.1 to C.sub.10 alkyl, C.sub.6 to C.sub.15 aryl or C.sub.3 to C.sub.10 cycloalkyl; R.sup.4 and R.sup.6 are substituents both having van der Waals radii larger than the van der Waals radii of groups R.sup.1 and R.sup.3 ; R.sup.

Abstract: Methods are disclosed for preparing a highly active solid metallocene-containing catalyst system and its use in the polymerization of olefins. The solid catalyst system is prepared by combining an aluminoxane with a metallocene having a substituent which has internal alkynyl unsaturation in a suitable liquid to form a liquid catalyst system, conducting prepolymerization of an olefin in the liquid catalyst system, and separating the resulting solid metallocene-containing catalyst system from the last reaction product mixture. Also polymerization of olefins using the inventive solid catalyst system is disclosed.

Abstract: The present invention relates to a new polymer compositions for use in the manufacture of ophthalmic lenses, to their use in ophthalmology and to apparatus using these lenses, such as eyepieces and film/video camera optics.

Abstract: An ethylene/.alpha.-olefin copolymer obtained by copolymerizing ethylene with an .alpha.-olefin of 3 to 20 carbon atoms in the presence of a catalyst for olefin polymerization comprising an organoaluminum oxy-compound (a) and at least two kinds of transition metal compounds (b). This ethylene/.alpha.-olefin copolymer has high melt tension and high flowability.

Abstract: The present invention provides a gel-glass dispersed liquid crystal. The raw material composition of the gel-glass dispersed liquid crystal includes a three functionally substituted silane, two functionally substituted silane, a metal alkoxide and a liquid crystal. At least one of the non-hydrolyzable moieties of the three functionally substituted silane, two functionally substituted silane and metal alkoxide has at least one amino group or a reactive functional group. The refractive index of the oxide of the metal is not less than 1.52. The obtained gel-glass dispersed liquid crystal has good film integrity and flexibility and a low operation voltage.

Abstract: Propylene isoblock polymers with 0.5 to 10 mol %, based on the total polymer, of randomly distributed ethylene content and with a narrow molecular weight distribution and rubber-like properties are obtained when propylene is polymerized using a catalyst comprising an aluminoxane and a chiral metallocene, containing bridges, of formula I: ##STR1## in which M.sup.1 is preferably hafnium or zirconium,R.sup.1 and R.sup.2 are preferably halogen (e.g. C1) atoms,R.sub.3 through R.sup.6 are hydrogen or C.sub.1 -C.sub.10 alkyl, and pair of adjacent radicals R.sup.3, R.sup.4, R.sup.5, and R.sup.6 can form an aromatic ring with the C-atoms to which they are bonded, andR.sup.7 is preferably --Si(CH.sub.3).sub.2 --Si(CH.sub.3).sub.2 --.

Abstract: A method is provided for the production of a water-soluble or water-dispersible copolymer. The copolymer is comprised of a water-soluble base monomer and/or a water-soluble or water-dispersible macromer. The disclosed method involves a two step polymerization procedure wherein in a first step a minor portion of the reactants are polymerized to conversion under conditions which result in the formation of a low molecular weight product, and in a second step the remaining portion of the reactants are polymerized to conversion in the presence of the reaction product of the first step under conditions which result in the production of a higher molecular weight product.

Abstract: A process for preparing a block copolymer of an .alpha.-olefin and a vinyl compound is here disclosed which comprises the steps of polymerizing an olefin selected from ethylene and the .alpha.-olefin having 3 or more carbon atoms by the use of a divalent or a trivalent rare earth metal complex, and then polymerizing a vinyl compound, a vinylidene compound or a lactone. According to the process of the present invention, a polar group can be introduced into a polyolefin, whereby the characteristics of the polymer can be effectively improved.

Abstract: A process for the preparation of an olefin polymer by polymerization or copolymerization of an olefin of the formula R.sup.a --CH.dbd.CH--R.sup.b, in which R.sup.a and R.sup.b are identical or different and are a hydrogen atom or a hydrocarbon radical having 1 to 14 carbon atoms, or R.sup.a and R.sup.b, together with the atoms connecting them, can form a ring, at a temperature of from -60.degree. to 200.degree. C., at a pressure of from 0.5 to 100 bar, in solution, in suspension or in the gas phase, in the presence of a catalyst formed from a metallocene in the meso-form or a meso:rac mixture, with meso:rac>1:99, as transition-metal compound and a cocatalyst, wherein the metallocene is a compound of the formula I, ##STR1## in which M.sup.1 is Zr or Hf, R.sup.1 and R.sup.2 are identical or different and are methyl or chlorine, R.sup.3 and R.sup.6 are identical or different and are methyl, isopropyl, phenyl, ethyl or trifluoromethyl, R.sup.4 and R.sup.5 are hydrogen or as defined for R.sup.3 and R.sup.

Abstract: A polymerizable acrylic composition comprises:(a) at least one acrylic monomer;(b) an effective amount of an organoborane amine complex having the structure: ##STR1## wherein: R.sup.1 is an alkyl group having 1 to 10 carbon atoms;R.sup.2 and R.sup.3 are independently selected from phenyl-containing groups and alkyl groups having 1 to 10 carbon atoms;Rhu 4 is selected from the group consisting of CH.sub.2 CH.sub.2 OH and (CH.sub.2).sub.x NH.sub.2 wherein x is an integer greater than 2;R.sup.5 is hydrogen or an alkyl group having 1 to 10 carbon atoms; andthe nitrogen atom to boron atom ratio is about 1:1 to 1.5:1; and(c) an effective amount of an acid for initiating polymerization of the acrylic monomer.The polymerizable acrylic compositions are especially useful for bonding low surface energy substrates.

Abstract: A polymerizable acrylic composition comprises:(a) at least one acrylic monomer;(b) an effective amount of an organoborane amine complex having the structure: ##STR1## wherein: R.sup.1 is an alkyl group having 1 to 10 carbon atoms;R.sup.2 and R.sup.3 are independently selected from phenyl-containing groups and alkyl groups having 1 to 10 carbon atoms;R.sup.4 is selected from the group consisting of CH.sub.2 CH.sub.2 OH and (CH.sub.2).sub.x NH.sub.2 wherein x is an integer greater than 2;R.sup.5 is hydrogen or an alkyl group having 1 to 10 carbon atoms; andthe nitrogen atom to boron atom ratio is about 1:1 to 1.5:1; and(c) an effective amount of an acid for initiating polymerization of the acrylic monomer.The polymerizable acrylic compositions are especially useful for bonding low surface energy substrates.

Abstract: A process for preparing oligomers and polymers, obtained fromA) from 0.001 to 100 mol % of at least one aminoalkene of the formula I ##STR1## where X is an integer from 0 to 25 andR.sup.1 to R.sup.6 are hydrogen, C.sub.1 - to C.sub.10 -alkyl, 5- to 7-membered cycloalkyl which, in turn, can carry C.sub.1 - to C.sub.6 -alkyl groups as substituents or C.sub.6 - to C.sub.15 -arylandB) from 0 to 99.999 mol % of at least one alkene,for x=1 in formula I propene being excluded as component B).