Class 528/234 - Material contains a transition metal atom

Subclass of Class 528 - Synthetic resins or natural rubbers -- part of the class 520 series
Definition: Subject matter wherein the specified material contains at
No. of patents: 24
Last issue date: 05/13/2008

Number	Title	Issue Date
7371808	Polymer treating method and apparatus A polymer treating method has the steps of: reacting a polymer compound with a reaction agent in a reaction vessel to generate a polymer treatment product; discharging the polymer treatment product containing the reaction agent from the reaction vessel; depressurizi...	05/13/2008
6506850	Polyoxymethylene copolymer and composition thereof A polyoxymethylene copolymer having a melting point of 167° to 173° C. and containing a low molecular weight polyoxymethylene copolymer in an amount of not higher than 5000 ppm, and a composition thereof. The copolymer is obtainable by subjecting unstab...	01/14/2003
6020452	Chiral biphenyl compounds for use in asymmetric reactions A chiral biphenyl compound includes a hindered 2,2'-substituted-1,1'-biphenyl subunit and has the following formula: ##STR1## The chiral biphenyl compounds have been shown to be useful as catalysts in asymmetric reactions. For example, an organozinc ...	02/01/2000
5929195	Process for producing branched or crosslinked polyacetal resin A branched or crosslinked polyacetal resin is excellent in blow moldability, has impact resistances such as plane impact resistance, and the smoothness of the inner surfaces of moldings produced therefrom, and is suitable for molding, particularly blow mo...	07/27/1999
5889134	Chiral organozinc species for use in asymmetric reactions An organozinc species, useful in the reactions of aldehydes and ketones, is a reaction product of a) a biphenyl compound having one or more hindered 2,2'-substituted biphenyl subunits and b) an organozinc compound, such as diethylzinc. The organozinc spec...	03/30/1999
5866670	Process for preparing polyacetal copolymer A process for producing a polyacetal copolymer, which is extremely heat-stable and is extremely reduced in the quantity of unstable terminals even in a high polymerization yield in which trioxane as the principal monomer, comprises copolymerization of tri...	02/02/1999
5844059	Process for preparing polyacetal copolymer To prepare a thermally very stable polyacetal copolymer containing a very small amount of unstable parts in a high yield according to a simple process wherein an isopolyacid or an acid salt thereof is used as the polymerization catalyst in the copolymeriz...	12/01/1998
5770678	Polymerization of, and depolymerization to, cyclic ethers using selected metal compound catalysts A process for polymerizing oxiranes, oxetanes, oxepanes, dioxolanes, trioxanes, and tetrahydrofurans to their respective polymers by contacting them with a selected metal compound is disclosed; and also a process for depolymerizing polytetrahydrofurans to...	06/23/1998
5763560	Method of producing styrene derivatives A method of producing styrene derivatives expressed the general formula (2) by reacting a benzaldehyde derivative expressed by the general formula (1) with dibromomethane under the existence of zinc metal as well as an active chloride for producing variou...	06/09/1998
5728798	Process for preparing polyacetal copolymer In preparing a polyacetal copolymer through copolymerization of trioxane as the principal monomer with a cyclic ether or cyclic formal having at least one carbon-carbon bond as the comonomer, 0.05 to 100 ppm (on the weight basis), based on the total amoun...	03/17/1998
5726276	Process for preparing polyacetal copolymer The present invention provides a process for preparing a thermally very stable polyacetal copolymer having very small unstable terminals even at a high polymerization yield, by the copolymerization of trioxane as the principal monomer with a comonomer cop...	03/10/1998
5646235	Reductive alkylation of polyamines A method is provided for the preparation of tertiary polyamines by alkylating a polyamine having at least two primary amino groups without the use of excess solvent. More particularly, a tertiary amine is produced by reductively alkylating a polyamine wit...	07/08/1997
5641853	Polymerization of cyclic ethers using selected metal compound catalysts A process for polymerizing oxepanes, dioxolanes, trioxanes, and tetrahydrofurans to their respective polymers by contacting them with a selected metal compound and an accelerator which is a selected vinyl ester or a selected phosphorous compound....	06/24/1997
5608030	Process for the preparation of polyacetals Process for continuous preparation of homo- and copolyoxymethylenes with stable end groups in a homogeneous phase, in which in a tubular reactor with static mixing elements cyclic formaldehyde oligomers are polymerized in the presence of protonic acids as...	03/04/1997
5124417	Initiators for cationic polymerization Disclosed are novel compounds which are useful as initiators for cationically polymerizable monomers. The novel compounds comprise a carbon containing cation (e.g., trimethyloxonium) which is capable of initiating cationic polymerization and a non-nucleop...	06/23/1992
5115083	Curable aminoplast compositions and catalysts for curing same The present invention relates to a curable composition comprising: (A) at least one aminoplast resin; and (B) an amount effective to cure the composition of at least one catalyst selected from the group consisting of (B-1) an acid, or an anhydride, ester, ammonium ...	05/19/1992
5025085	Curable aminoplast compositions and catalysts for curing same The present invention relates to a curable composition comprising: (A) at least one aminoplast resin; and (B) an amount effective to cure the composition of at least one catalyst which is a sulfo acid, or an anhydride, ester, ammonium salt or metal salt of the...	06/18/1991
4956445	Process for the preparation of acetal polymer or copolymer Acetal polymer having a high degree of polymerization is obtained using a catalyst of a heteropoly acid or an acid salt thereof in a small amount. The catalyst is represented by formula: Hx [Mm .multidot.M'n Ol ]yH	09/11/1990
4931535	Process for the preparation of acetal polymer or copolymer Acetal polymer and copolymer are prepared by polymerizing formaldehyde or its cyclic oligomer as a principal monomer, or copolymerizing the principal monomer with a comonomer copolymerizable therewith, using an isopoly acid or an acid salt thereof as a po...	06/05/1990
4904516	Phenol-formaldehyde resin solution containing water soluble alkaline earth metal salt A process for preparing a water soluble phenol-formaldehyde resole resin having improved storage stability employs a calcium compound to catalyze the condensation reaction which occurs under basic conditions. Sulfamic acid is used to neutralize the resole...	02/27/1990
4405771	Organometallic polymers, their preparation and compositions containing them There are provided metal containing polymeric coordination compounds which are prepared by a process which comprises reacting metal salts with polydentate ligand molecules obtained by the condensation of aromatic dialdehydes with ଲ-hydroxy-଱,�...	09/20/1983
4398034	Process for the preparation of low molecular weight polyesters from hydroxypivaldehyde The present invention provides a process for the preparation of low molecular weight polyesters directly from hydroxypivaldehyde. The process comprises reacting dry hydroxypivaldehyde with a diester, a multifunctional ester, a diacid, a polyester, or a mi...	08/09/1983
4173551	Heat curable compositions Aromatic onium salts, such as diaryliodonium salts, have been found to be effective thermal initiators for the polymerization of a variety of cationically polymerizable materials including epoxides, cyclic ethers, phenol formaldehyde resins, etc., when us...	11/06/1979
4133801	Process for the preparation of polyesters A process for the preparation of polyesters by reacting a di-lower alkyl ester of a dicarboxylic acid consisting mainly of terephthalic acid with an alkylene glycol consisting mainly of ethylene glycol or tetramethylene glycol and thereafter polycondensin...	01/09/1979

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Class 528/234 - Material contains a transition metal atom