The present invention relates to a novel ligand compound represented by Formula 1 and a novel transition metal compound represented by Formula 2, and the novel ligand compound and transition metal compound according to the present invention has high comonomer incorporation effect in the preparation of an olefinic polymer having a low density and a high molecular weight, and thus can be usefully used as a catalyst for a polymerization reaction.

A process for preparing a (meth)acrylate comprising preparing an aqueous phase by combining water, one or more stabilizing agents, and one or more surfactants; preparing an oil phase by combining one or more free radical initiators, one or more monomers capable of undergoing radical polymerization, one or more crosslinking and/or graft-linking monomers, and stearyl methacrylate and/or lauryl methacrylate, wherein the free radical initiator is capable of partitioning preferentially into the oil phase; combining the aqueous and oil phases and mixing to form a suspension having oil droplets ranging in size from 1 to 10 microns; raising the temperature of the suspension to effect an initial polymerization forming a core polymer is provided.

A process for preparing a (meth)acrylate comprising preparing an aqueous phase by combining water, one or more stabilizing agents, and one or more surfactants; preparing an oil phase by combining one or more free radical initiators, one or more monomers capable of undergoing radical polymerization, one or more crosslinking and/or graft-linking monomers, and stearyl methacrylate and/or lauryl methacrylate, wherein the free radical initiator is capable of partitioning preferentially into the oil phase; combining the aqueous and oil phases and mixing to form a suspension having oil droplets ranging in size from 1 to 10 microns; raising the temperature of the suspension to effect an initial polymerization forming a core polymer is provided.

The present invention involves a radical polymerization initiator comprising an organotellurium compound represented by a formula (1), wherein R.sup.1 represents an alkyl group or the like, each of R.sup.2 and R.sup.3 independently represents a hydrogen atom or the like, and each of R.sup.4, R.sup.5, and R.sup.6 independently represents a hydrogen atom or the like. The present invention provides: a radical polymerization initiator that is useful for producing a polymer that includes a double bond at the molecular terminal; and a method for producing a polymer that utilizes the radical polymerization initiator. ##STR00001##

The present invention involves a radical polymerization initiator comprising an organotellurium compound represented by a formula (1), wherein R.sup.1 represents an alkyl group or the like, each of R.sup.2 and R.sup.3 independently represents a hydrogen atom or the like, and each of R.sup.4, R.sup.5, and R.sup.6 independently represents a hydrogen atom or the like. The present invention provides: a radical polymerization initiator that is useful for producing a polymer that includes a double bond at the molecular terminal; and a method for producing a polymer that utilizes the radical polymerization initiator. ##STR00001##

The present invention involves a radical polymerization initiator comprising an organotellurium compound represented by a formula (1), wherein R.sup.1 represents an alkyl group or the like, each of R.sup.2 and R.sup.3 independently represents a hydrogen atom or the like, and each of R.sup.4, R.sup.5, and R.sup.6 independently represents a hydrogen atom or the like. The present invention provides: a radical polymerization initiator that is useful for producing a polymer that includes a double bond at the molecular terminal; and a method for producing a polymer that utilizes the radical polymerization initiator. ##STR00001##

Described herein is a new initiator system for initiating radical polymerization of ethylenically unsaturated monomers. The initiator system comprises an organic compound having N-charged moiety in combination with an organic thiol compounds. The initiator system demonstrates better stability and is suitable for use in the field of a dentistry in formulated dual cure compositions, such as a resin modified glass ionomers, a cement, an orthodontic adhesive, and composite formulations.

A polymer resin compound, a photosensitive resin composition for a black bank comprising the polymer resin compound, and a method for manufacturing a black bank. The method comprises coating the photosensitive resin composition on a substrate to form a photosensitive resin film; exposing and developing the photosensitive resin film to pattern the coated photosensitive resin film; and curing the patterned photosensitive resin film.

The present invention relates to a novel ligand compound represented by Formula 1 and a novel transition metal compound represented by Formula 2, and the novel ligand compound and transition metal compound according to the present invention has high comonomer incorporation effect in the preparation of an olefinic polymer having a low density and a high molecular weight, and thus can be usefully used as a catalyst for a polymerization reaction.

The present application relates to a method of performing living cationic polymerization of monomers by supermolecular anion-binding catalysis. It uses various simple Bronsted acids or adducts thereof with a monomer as the cationic initiator, and various hydrogen bond donors as the catalyst for binding and dissociating counter anions dynamically, to living and controlled polymerize one or more cationically polymerizable monomers to form a homopolymer or a copolymer. In the present application, the hydrogen-bond donor can exert non-covalent anion-binding interactions to dynamically and reversibly activate dormant covalent bond under mild conditions, in turn to precisely control the equilibrium between dormant covalent precursors and active cationic species, thereby achieving the precise control of the polymer's molecular weight, distribution and end group structure, and solving the environment-unfriendly relevant problems in traditional metal-based Lewis acid catalysis, which include extreme low polymerization temperature, restrict anhydrous requirement of the reaction, strict purification requirement of the monomer and catalysis-initiating system, metal residue in polymer or the like.