Matches 101 - 150 out of 291 < 1 2 3 4 5 6 >
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5258484 Process for the production of polycarbonate  
A process for the continuous production of a thermoplastic aromatic polycarbonate is disclosed. Accordingly, in a reactor system which includes a tube reactor and a tank equipped with a stirrer,...
5235026 Continuous production of polycarbonates  
An improvement to the continuous process for the production of polycarbonates by interphase polycondensation is described. Accordingly, the organic phase and the aqueous phase are combined in a...
5225518 Polycarbonate preparation from molten bisphenol-A/water mixture  
In the interfacial polymerization process for preparing aromatic carbonate polymers by reacting bisphenol-A with a carbonate precursor, the bisphenol-A is introduced to the reaction medium in a...
5210173 Catalytic, interfacial preparation of aromatic polycarbonates with continuous dosing of carbonate precursor  
The invention relates to a method of preparing aromatic polycarbonates by catalytic interface polymerization of at least one bivalent phenol and a carbonyl halide in the presence of a...
5210172 Method for the continuous preparation of carbonate oligomers with loop reactor, static mixer and plug flow  
The invention relates to a method for the continuous preparation of carbonate oligomers by boundary face oligomerization of aromatic dihydroxy compounds with phosgene while adding base, in which...
5200496 Process for preparing polycarbonate having reduced carbonate byproduct content  
A process for preparing polycarbonate wherein a chain terminator is added to the reaction mixture after substantial reaction of a carbonate precursor, a coupling catalyst is added to the reaction...
5187255 Method of producing a polyether copolymer  
A method of producing a polyether copolymer by reacting a dihalogenobenzonitrile, 1,4-bis(4'-halobenzoyl)benzene, with 4,4'-biphenol in an aprotic polar solvent in the presence of an alkali metal...
5168112 Process for the preparation of a polycarbonate with piperidinyl pyridine catalyst  
A polycarbonate is produced by melt-polycondensing a dihydric hydroxy compound and a bisarylcarbonate in the presence of 4-(4-methyl-1-piperidinyl)-pyridine, or a salt thereof, as a catalyst. The...
5151491 Catalytic melt condensation preparation of polycarbonate  
Disclosed herein are processes for the production of polycarbonates by melt polycondensation of an aromatic dihydroxy compound and a carbonic acid diester or a diphenyl carbonate compound wherein...
5149770 Preparation of a polycarbonate with electron donative amine compound and alkali or alkaline earth metal compound  
A polycarbonate is produced by melt-polycondensing a dihydric hydroxy compound and a bisarylcarbonate in the presence of a catalyst system comprising an electron donative amine compound and a...
5142018 Process for preparing polycarbonates  
A process for preparing polycarbonates according to the invention by melt polycondensation of aromatic dihydroxy compounds and carbonic acid diesters, is characterized by using an aromatic...
5115081 Process for producing copolycarbonate oligomer from dichloroformate  
A process for producing a dichloroformate of a tetrahalogenated bisphenol by an interfacial process in a high yield and a high content and a process for producing an aromatic copolycarbonate...
5097002 Melt, catalytic process for preparing polycarbonates from carbonic acid diester  
A process for preparing polycarbonates according to the invention by melt polycondensation of aromatic dihydroxy compounds and carbonic acid diesters, is characterized by using an aromatic...
5097009 Method for making cyclic oligomeric aromatic polycarbonates from monochloroformate  
A method for making cyclic polycarbonate oligomers is provided by converting oligomeric monochloroformate carbonates to the cyclic state. Improvements in materials usage, process control, and...
5077379 Coating compositions based on unsaturated polyester, latent polyamine and cyclic ketone  
A curable coating composition which comprises a) a condensation polymer in which the backbone contains activated unsaturated groupings. b) a compound containing at least three blocked primary...
5047497 Water-in-oil emulsion process for producing an aromatic polycarbonate  
A process for producing an aromatic polycarbonate in a water-in-oil emulsified form, having an improved heat stability during molding at a high temperature, is described. In the process according...
5043403 Polycarbonates containing mesogenic compounds as end groups, their preparation and their use  
This invention relates to thermoplastic, aromatic polycarbonates in which mesogenic compounds corresponding to the following formula ##STR1## are incorporated as chain terminating agents, to their...
5041523 Process for production of branched polycarbonate  
A process for producing a branched polycarbonate by an interfacial polycondensation method comprising condensing a first reaction mixture comprising an inert organic solvent, an alkaline aqueous...
5037941 Interfacial preparation of polycarbonate prepolymer with motionless mixer  
Polycarbonate prepolymers are produced by adding phosgene, one or more dihydric phenols, a halogenated organic solvent, and an aqueous caustic solution together with mixing in motionless mixers to...
5028690 Aromatic polycarbonate end capped with maleimide moiety  
An aromatic polycarbonate containing at least one terminal group represented by the formula ##STR1## wherein R and R' are the same or different and are alkyl, aryl or halogen; a and b are the same...
5026817 Catalytic process for preparing polycarbonates from carbonic acid  
A process for preparing polycarbonates according to the invention by melt polycondensation of aromatic dihydroxy compounds and carbonic acid diesters, is characterized by using an aromatic...
5025083 Process for preparation of polycarbonate  
A polycarbonate is produced by melt-polycondensing (A) a dihydric phenol with a co-monomer selected from the group consisting of (B) bisphenol carbonate, (C) bis(2,4,6-trichlorophenyl) carbonate...
5021541 Polycarbonate resin from bis(hydroxy benzoyl oxy-tetra oxa spiro) cpd.  
A polycarbonate resin comprising either a structural unit derived from a spiro ring-containing dihydric phenol, or such a structural unit and a structural unit derived from a dihydric phenol, and a...
4994594 Oligomeric carbonate chainstoppers  
Oligomeric carbonate dihydroxyaromatic-based chainstoppers are disclosed. One example of this type of chainstopper is a bisphenol A bischloroformate oligomer monocapped with phenol. These...
4952664 Process for producing weather-resistant polycarbonate with triazine-imide chain terminator  
A process for producing a weather-resistant polycarbonate resin by solution polymerization, of at least one dihydric phenol and phosgene in which a compound represented by formula (I): ##STR1##...
4950731 Method for preparing spirobiindane polycarbonates  
Homo- and copolycarbonates of spirobiindane bisphenols are prepared by first reacting phosgene with a substantially pure spirobiindane bisphenol in the presence of aqueous base in a heterogeneous...
4940771 Reactive polycarbonate end capped with hydroxy phenyl oxazoline  
Polycarbonate and polyarylate resins are chain-terminated with a group selected from those of the formula: ##STR1## wherein each R independently represents one of hydrogen or lower alkyl. The...
4939231 Process for producing fatty acid-terminated polycarbonate resin  
A process for producing a polycarbonate resin having excellent heat stability from a dihydric phenol compound represented by the formula (1) shown below by an interfacial polymerization method...
4933425 Aromatic polycarbonate capped with norbornene phenyl imide compound  
An aromatic polycarbonate containing at least one terminal group represented by the formula ##STR1## wherein R and R' are the same or different and are alkyl, aryl or halogen; a and b are the same...
4920198 Branched polycarbonate from hydroxy-naphthoic acid or derivative, and process for preparing  
Branched, thermoplastic polycarbonates, suitable for being processed according to the blow-molding technique, are prepared by copolymerization with hydroxy-naphthoic acids or their derivatives.
4918155 Process for production of polycarbonate  
A process for producing polycarbonate is disclosed, comprising reacting a halogenated bisphenol-containing organic dihydroxy compound and a carbonate-forming derivative in a liquid medium in the...
4902758 Preparation of segmented block copolycarbonates  
Segmented block copolycarbonates from diphenols and tetrahalogenated diphenols are prepared by phosgenation, under interfacial reaction conditions, initially at a higher pH during which diphenol...
4889911 Process for the production of fully aromatic, thermotropic polyesters and polyester carbonates  
Thermotropic, fully aromatic polyesters and polyester carbonates are produced by esterification of optionally substituted p-hydroxybenzoic acids and aromatic dicarboxylic acids with diaryl...
4888411 Crosslinkable polycyclic polycarbonate oligomer and methods for their preparation and use  
Polycyclic polycarbonate (or thiol analog) oligomers are prepared from a mixture of at least one bishaloformate with at least one tetraphenol, or thio analogs thereof. Such mixture may also contain...
4883856 Flame-resistant polycarbonates, containing in their polymeric chain units deriving from mono-halogenated tetra-phenyl compounds  
Thermoplastic, branched, high-molecular weight polycarbonates endowed with properties of flame-resistance (self-extinguishing polycarbonates) are characterized by the presence in their polymeric...
4880897 Process for preparing aromatic polycarbonates  
High molecular weight polycarbonates are prepared by reacting a sterically hindered, substituted aromatic bischloroformate with an alkali metal hydroxide in the presence of a substituted pyridine.
4857627 Amino phenol end capped aromatic polycarbonate reacted with sulfonate  
A composition comprising an aromatic carbonate polymer end-capped with a group of the structure ##STR1## wherein --+NR 1 R 2 R 3 is meta or para to the O and R 1 , R 2 and R 3 are the same or...
4847352 Polycarbonate production with motionless mixer  
Polycarbonate prepolymers are produced by adding phosgene, one or more dihydric phenols, a halogenated organic solvent, and an aqueous caustic solution together with mixing in motionless mixers to...
4794156 Two stage catalytic production of high molecular weight polyhalobisphenol polycarbonates  
High molecular weight polyhalobisphenol polycarbonates are produced by adding phosgene to a polyhalobisphenol in the alkali metal phenate form whereby the chloroformates of the bisphenol are formed...
4794160 Crosslinkable polycyclic polycarbonate oligomers and method for their preparation  
Polycyclic polycarbonate (or thiol analog) oligomers are prepared from a mixture of at least one bishaloformate with at least one tetraphenol, or thio analogs thereof. Such mixture may also contain...
4772526 Electrophotographic element  
A reusable electrophotographic imaging element having a photoconductive surface layer in which the binder resin comprises a block copolyester or copolycarbonate having a fluorinated polyether...
4755586 Method for preparing crosslinkable polycyclic polycarbonate oligomer compositions with suppression of aqueous emulsion formation  
Polycyclic polycarbonate oligomers are prepared by the reaction of a bishaloformate and a tetrahydroxyaromatic compound (and optionally also a dihydroxy compound) in the presence of an olefinic...
4737573 Method for polymerizing aromatic bischloroformate composition to polycarbonate  
Bischloroformate oligomer compositions are prepared by passing phosgene into a heterogeneous aqueous-organic mixture containing at least one dihydroxyaromatic compound, with simultaneous...
4736013 Method for the preparation of hydroxy-terminated polycarbonate polymers  
A method for preparing thermoplastic carbonate polymers terminated with hydroxy groups is disclosed, in which a dihydric phenol is reacted with a carbonyl halide in the presence of a...
4730033 Coating compositions  
Coating compositions which are capable of curing at room temperature comprise (i) a condensation polymer in which the polymer backbone contains at least one grouping of the formula...
4722994 Method of preparing cyclic oligomeric polycarbonates  
A catalyzed interfacial polycondensation aromatic polycarbonate process comprising mixing a water soluble metal salt of a dihydric phenol with an aqueous solution of a strong base and a...
4661566 UV-absorbing condensation polymeric composition  
Compositions comprising polyester or polycarbonate having reacted therein a total of from about 1.0 to about 5,000 parts by weight per million parts by weight of polyester of at least one UV...
4650852 Method for controlling polymerization rate of cyclic polycarbonate oligomers with pretreated catalyst  
Cyclic polycarbonate oligomers are polymerized to linear polycarbonates by contact with a polycarbonate formation catalyst which has been modified by contacting the same with at least one diaryl...
4631334 Optical articles of branched polycarbonate resin  
A transparent optical article is disclosed, which is produced by molding a branched polycarbonate resin having a viscosity average molecular weight of from 13,000 to 20,000 as prepared from at...
4563516 Polyether-polycarbonates for dialysis membranes  
The present invention relates to a process for the preparation of polyether-polycarbonates, a process for stabilizing the polyether-polycarbonates thus prepared, a process for the production of...
Matches 101 - 150 out of 291 < 1 2 3 4 5 6 >