Matches 151 - 200 out of 291 < 1 2 3 4 5 6 >
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4558118 Two phase interfacial polycondensation polycarbonate process  
This invention relates to an improved interfacial polycondensation aromatic polycarbonate process which does not require large quantities of strong base to provide a particulate product. The...
4558106 Polymerization process using metal formate to reduce the color of thermoplastic copolymers  
Described is a process for improving the color of thermoplastic polymers by contacting the monomer(s) before or during polymerization with an alkali or alkaline earth metal formate.
4535143 Process for the preparation of copolycarbonates of sulfonyl diphenol  
The present invention is directed to a continuous process for the preparation of copolycarbonates of sulfonyl diphenol (SDP) containing at least about 15, preferably about 15 to about 80 percent by...
4533722 Interfacial polycondensation polycarbonate process with quaternary phosphonium amino halide catalyst  
This invention relates to an improved interfacial polycondensation polycarbonate process wherein a dihydric phenol is reacted with a carbonyl halide in the presence of a quaternary-phosphonium...
4529791 Interfacial polycarbonate preparation by adding additional solvent  
An interfacial process for the preparation of polycarbonates having improved optical properties is disclosed wherein dihydric phenols are reacted with phosgene in the presence of an aqueous alkali...
4520187 Polycarbonates and polyester carbonates exhibiting improved heat resistance  
Novel heat resistant polycarbonates are provided which are the polymerized reaction products of: (i) a carbonate precursor; and (ii) at least one dihydric phenol selected from dihydric...
4518747 Polycarbonates having terminal groups which contain conjugated double bonds  
The present invention is directed to molding compositions comprising aromatic, thermoplastic polycarbonate resins at least some molecular chains thereof are characterized in that their terminal...
4515936 Catalyzed interfacial polycondensation polycarbonate process  
This invention relates to a catalyzed interfacial polycondensation aromatic polycarbonate process which comprises forming an agitated two-phase mixture comprising an organic solvent phase with...
4506066 Thermoplastic polycarbonates, their preparation and their use as shaped articles and films  
The present invention relates to high molecular weight thermoplastic hexahydro-furo-(3,2-b)-furane-3,6-diol based copolycarbonates useful as molding resins and to a method for their preparation.
4503213 Process for the preparation of polycarbonates having N-alkyl-perfluoroalkyl sulfonamide terminal groups  
The instant invention relates to a process for the preparation of linear aromatic polycarbonate resins by the known two-phase interfacial process and is directed to the use of perfluoroalkyl...
4471104 Process for the preparation of polycarbonates having sulfonanilide terminal groups  
The present invention relates to the preparation of aromatic polycarbonates by the known two-phase interface process, from diphenols characterized in that aromatic sulfonanilides are used as chain...
4452966 Process for the production of polycarbonate  
A process for producing polycarbonate is described, comprising reacting a chloroformate group-containing polycarbonate oligomer with an aqueous alkaline solution of a compound containing at least...
4448950 Polycarbonate having improved critical thickness  
Polycarbonates are provided having improved critical thickness values based on an aromatic diphenol preferably bisphenol A and an aromatic diphenol thioether. By incorporating 2 up to 20 mole...
4448953 Preparation of benzoate ester terminated polycarbonate with aroyl halide  
A process for preparing an aromatic polycarbonate of controlled molecular weight which comprises interfacially reacting in water and an organic solvent, a dihydric phenol, a carbonate precursor and...
4436839 Process for preparing polycarbonate-polyether-blockcopolymers  
A method for production of polycarbonate-polyether-blockcopolymers is provided. One or more solutions comprising bisphenol A and polyalkyleneglycol and a phosgene solution are added to a cooled...
4393190 Carbonate copolymers prepared from imide reactants  
Novel carbonate polymers comprised of the reaction product of a dihydric phenol, a carbonate precursor, and at least one imide selected from the group of compounds represented by the formulae ##STR1##
4388455 Process for preparing ester carbonate copolymers  
Ordered ester/carbonate copolymers having improved properties at higher solids are provided by (1) contacting a dihydric organic compound such as bisphenol-A with a diacid halide such as...
4384108 Two-phase interfacial polycarbonate process  
An improved interfacial polycondensation polycarbonate process, the improvement comprising an initial equilibrated pH range of 11 to 13, a temperature range of 15° to 40° C., a carbonyl halide...
4378454 Preparation of polycarbonates in a homogeneous solution  
Polycarbonates are prepared in homogeneous solutions from dihydric phenols and phosgene wherein the stoichiometric end point for the addition of phosgene is accurately controlled by using...
4363905 Polycarbonate transesterification from bis(ortho-nitroaryl)carbonate  
A polycarbonate transesterification process comprising reacting a bis(ortho-nitroaryl)carbonate and a dihydric phenol under transesterification reaction conditions.
4361693 Preparation of poly(arylene ketones) using thio- and dithiocarbonic acid derivatives  
Poly(arylene ketones) are prepared by the reaction of difunctional aromatic compounds with derivatives of thio- or dithiocarbonic acids in the presence of a superacid catalyst system. In a...
4346210 Process for the preparation of polycarbonates catalyzed by cyclic aza compounds  
The present invention relates to a process for the preparation of aromatic polycarbonates from diphenols by the phase boundary process, which is characterized in that cyclic, preferably monocyclic...
4345062 Polycarbonate transesterification with tetraborate or tetraaluminate anion containing catalyst  
An improved aromatic polycarbonate transesterification process comprising reacting a bis(aryl)carbonate and a phenol in the presence of a transesterification catalyst containing tetraborate or...
4330664 Polycarbonate transesterification with catalyst containing aluminum hydride or borohydride group  
An improved aromatic polycarbonate transesterification process comprising reacting a bis(aryl)carbonate and a dihydric phenol in the presence of a transesterification catalyst, the improvement...
4327015 Flame resistant, transparent polycarbonates comprising bisulfite adducts  
The invention is directed to flame-resistant, transparent aromatic polycarbonate compositions comprising polycarbonate resin and an additive amount of a member selected from the group consisting of...
4316980 Process for the preparation of tetramethylated bisphenol polycarbonates  
The present invention relates to a process for the preparation of thermoplastic, aromatic polycarbonates which contain structural units of the formulae 1 and/or 2 ##STR1## in which R denotes C 1 ...
4299948 Macrocyclic polycarbonates  
The subject of the instant invention are polycarbonates based on diphenols of the formula I ##STR1## wherein Y is a single bond, an elkylene- or alkylidene-radical with 1 to 7 carbon atoms, a...
4297455 Process for the preparation of carbonic acid aryl esters of polyester-diols lengthened via carbonate groups and their use for the preparation of polyester-diol bis-diphenol carbonates and polyester/polycarbonates  
The present invention relates to a process for the preparation of bis-carbonic acid aryl esters of polyester-diols, lengthened via --OCOO-- groups, characterized in that polyester-diols with...
4291151 Process for preparing polycarbonate using cyclic di- or triamine catalyst  
An interfacial polymerization process for preparing high molecular weight aromatic polycarbonates by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of...
4291150 Process for preparing polycarbonate using non-cyclic polyamine catalysts  
An interfacial polymerization process for preparing high molecular weight aromatic polycarbonates by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of...
4286083 Method of preparing polyester carbonates  
A novel process is disclosed for the preparation of copolyesters containing both carboxylate and carbonate groups. The process comprises reacting a carbonyl halide with a difunctional carboxylic...
4286085 Process for preparing polycarbonates using substituted pyridine catalysts  
An interfacial polymerization process for preparing a high molecular weight aromatic carbonate polymer by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount...
4286084 Process for preparing polycarbonate using certain nitrogen-containing heterocyclic compounds as catalysts  
An interfacial polymerization process for preparing high molecular weight aromatic polycarbonates by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of a...
4286086 Process for preparing polycarbonate using sterically hindered secondary amine catalysts  
An interfacial polymerization process for preparing high molecular weight aromatic polycarbonates by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of...
4281101 Process for the preparation of aliphatic-aromatic polycarbonates with diphenol carbonate end groups and their use for the preparation of high-molecular, segmented, aliphatic-aromatic polycarbonate elastomers which can be processed as thermoplastics  
The subject of instant invention is a process for the preparation of aliphatic-aromatic polycarbonates with diphenol carbonate end groups, the polycarbonates obtained therefrom and their use for...
4277597 Process for preparing polycarbonates using sterically hindered heterocycloaliphatic secondary amine catalysts  
An interfacial polymerization process for preparing high molecular weight polycarbonates by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of a...
4277598 Process for preparing polycarbonates using cyclic amidine catalysts  
An interfacial polymerization process for preparing high molecular weight aromatic polycarbonates by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of a...
4277599 Process for preparing polycarbonates using pyrrole catalysts  
An interfacial polymerization process for preparing a high molecular weight aromatic carbonate polymer by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount...
4268658 Process for preparing polycarbonates using iminoethers as catalysts  
An interfacial polymerization process for preparing high molecular weight polycarbonates by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of an...
4267305 Process for preparing polycarbonates using nitrogen crown-cyclic compounds as catalysts  
An interfacial polymerization process for preparing a high molecular weight aromatic carbonate polymer by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount...
4267303 Process for the preparation of polymers with diphenol carbonate end groups  
This disclosure is concerned with a single step process for the production of diphenol terminated polycarbonates by the transesterification of diphenols, bis-aryl carbonates and polymeric diols...
4262111 Process for preparing polycarbonates using amidine catalysts  
An interfacial polymerization process for preparing high molecular weight polycarbonates by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of a...
4262113 Process for preparing polycarbonates using amino guanidine or amino amidine catalysts  
An interfacial polymerization process for preparing high molecular weight aromatic polycarbonates by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount of...
4262110 Process for preparing polycarbonate using cyclic iminoethers as catalysts  
An interfacial polymerization process for preparing a high molecular weight aromatic carbonate polymer by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount...
4262112 Process for preparing polycarbonates using cyclic isourea catalysts  
An interfacial polymerization process for preparing a high molecular weight aromatic carbonate polymer by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount...
4258174 Process for preparing polycarbonates using isourea catalysts  
An interfacial polymerization process for preparing a high molecular weight aromatic carbonate polymer by reacting a dihydric phenol with a carbonate precursor in the presence of a catalytic amount...
4252939 Method for manufacture of aromatic polyester-polycarbonate  
An aromatic polyester-polycarbonate is prepared by (a) forming a low molecular weight polyester oligomer possessing terminal -OH groups by reacting a solution of a terephthaloyl chloride...
4247475 Chloroformates of cyanoacrylates  
Certain cyanochloroformates are described which have utility for imparting UV stability to polycarbonate resins.
4219635 Process for poly (bisphenol A/terephthalate/carbonate) using pyridine reaction medium  
Poly(ester/carbonates) are produced by adding phosgene to a reaction mixture of bisphenol A and terephthalic acid as ester-forming reactants, at mole ratios in the range between 2.0:0.8 and...
4217437 Process for the preparation of carbonic acid bis-diphenol esters of polyalkylene oxide-diols lengthened via carbonate groups and their use for the preparation of high-molecular, segmented polyether/polycarbonates which can be processed as thermoplastics  
The present invention relates to the transesterification of the carbonic acid aryl esters obtainable according to German Published Patent Specification No. 2,650,533 with an excess of diphenol for...
Matches 151 - 200 out of 291 < 1 2 3 4 5 6 >