Abstract: Polycarbonate resin compositions and methods for their preparation are disclosed. The disclosed compositions are comprised of polycarbonate resins and esters of aliphatic carboxylic acids and alcohols and exhibit good mold release and thermal stability while experiencing little discoloration during molding.

Abstract: A polymer blend comprising an aliphatic polyamide matrix and a dispersed phase of a polycarbonate and a compatibilizing agent having pendant succinic anhydride groups or epoxide groups, made under such blending conditions that the polymer stock melt temperature is 290.degree.-350.degree. C., has a combination of excellent toughness and stiffness properties.

Abstract: A process for the production of a polycarbonate powder comprising introducing an organic solvent solution of polycarbonate and steam into a mixing nozzle and obtaining the polycarbonate powder from a mixture ejected from the mixing nozzle, wherein the organic solvent solution contains 3 to 45% by weight of the polycarbonate, and the ratio of the weight of steam/the weight of an organic solvent in the organic solvent solution is 1/10 to 1/5.

Abstract: A phase difference compensation film formed of a polycarbonate, which can be used in a liquid crystal display and which shows a decreased change in retardation caused by a temperature change at a stretch forming time due to the use of a polycarbonate having a branched structure and having a viscosity-average molecular weight of 40,000 or less as the above polycarbonate.

Abstract: Fiber or film of water-absorbent water-insoluble fibrous material has a matrix of a crosslinked copolymer formed from 50 to 95% by weight of ethylenically unsaturated carboxylic monomer and 5 to 50% by weight of copolymerisable ethylenically unsaturated monomer. The matrix contains regions of a dispersed polymeric material, the matrix copolymer and the dispersed polymeric material being mutually immiscible and chemically substantially nonreactive under ambient conditions. The fiber or film can be produced by extruding a solution or dispersion of the polymeric material in a solution of the matrix copolymer in its non-crosslinked state into a gaseous environment.

Abstract: A process for preparing a substantially chloride-ion-free, high-molecular-weight, colorless and transparent polycarbonate by melt-polycondensing a dihydric phenol with a carbonic diester, which comprises using a carbonic diester which is substantially free from (A) phenyl salicylate, o-phenoxybenzoic acid and phenyl o-phenoxybenzoate, (B) tin ion, (C) methyl phenyl carbonate or (D) phenyl salicylate and o-phenoxybenzoic acid.A process for preparing a thermally stable polycarbonate by melt-polycondensing a dihydric phenol with a carbonic diester, which comprises using a borate or, a compound selected from the group consisting of electron-donative amines and salts thereof as a catalyst, and optionally an acidic substance.

Abstract: A degradable polymeric foam having a density of not more than 16 lb. per cu ft. comprising a polymer alloy comprising:(i) from 50 to 100% of one or more co or homopolymers having a molecular weight of greater than 40,000 comprising the residues of one or more monomers of the Formula:--OCR.sub.1 R.sub.2 (CR.sub.3 R.sub.4).sub.n CO-- (I)or--OCH(CH.sub.3)CO-- (II)wherein in Formula I, R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are independently selected from the group consisting of a hydrogen atom and a C.sub.1-4 alkyl radical, and n is zero or an integer from 1 to 5, provided that when a monomer residue of Formula II is present and in Formula I n is 1 and R.sub.2, R.sub.3, and R.sub.4 are hydrogen, R.sub.1 can not be a methyl radical; and(ii) from 0 to 50 weight % of one or more polymers selected from the group consisting of polymers having a Hildebrand parameter (.sigma.) of not more than 3 MPA.sup.1/2 different from that of the one or more co or homopolymers.

Abstract: Polycarbonates of formula (I) wherein a is an integer from 2 to 300; R.sup.1 and R.sup.2 are the same or different and are independently a polyester residue of formula (III) wherein x and y are integers from 1 to 50, R.sup.4 and R.sup.5, which are the same or different, are aliphatic straight or branched hydrocarbon chains having from 1 to 4 carbon atoms, R.sup.6 is an aliphatic or alicyclic straight or branched chain having from 2 to 18 carbon atoms, or a polyoxyalkylene residue of formula (II), the two groups --R.sup.4 --COO and --R.sup.5 --COO being randomly distributed in the polyester residue, x and y being in any possible ratio from 0 to 100, are synthesized by reacting dihydroxy compounds with 1,1'-carbonyldiimidazole. They are useful for the preparation of bioerosible matrices for biologically active compounds.

Abstract: Polycarbonate oligomers having hydroxy end groups are produced by a melt reaction with bisphenol-A and a basic catalyst. The oligomers may then be reacted with chloro end-group siloxanes in the presence of a solvent and an acid acceptor to yield polycarbonate-polysiloxane block co-polymers. The melt reaction occurs at elevated temperature without the direct use of phosgene gas.

Abstract: The present invention provides a copolyester having improved weatherability and photostability. The copolyester is useful for producing fibers useful for automobile interior, draperies, outdoor awning, and for polyester sheeting for applications such as glazing, window-well covers, signs, skylights, etc.

Abstract: A continuous process for preparing polymers is provided: The continuous process produces polymers from monoethylenically unsaturated acids or anhydrides, and a nitrogen-containing compound, optionally in the presence of a fluidizing agent. The polymers are useful as detergent additives, pigment and mineral dispersants, additives for fertilizers, and corrosion and scale inhibitors in boilers and cooling towers.

Abstract: A process for preparing a polycarbonate which comprises performing a transesterification and a polycondensation reaction with a diarylcarbonate and dihydroxyaryl compound, in a reaction apparatus composed of stainless steel comprising at least 12% by weight of Ni, and at least 22% by weight of Cr, and having Fe as the remaining main component. A polycarbonate which has a good color, is stable to hydrolysis and resistant to heat-yellowing is the resulting product.

Abstract: A thermoplastic resin composition which contains 1-99 parts by weight of a polycarbonate resin and/or a copolyester carbonate resin, 99-1 parts by weight of a copolymer containing an aromatic vinyl monomer component, and a vinyl cyanide monomer component, and 1-40 parts by weight, based on 100 parts by weight of the resin and the copolymer combined, of a copolymer obtained by grafting onto a rubbery polymer an acrylic monomer provides polycarbonate resin compositions having excellent low-temperature impact properties and outstanding moldability.

Abstract: A process and a polymerization mixture for making integral skin polyurethane wherein Component A containing an isocyanate source is combined with Component B containing a polyol source mixture which includes a blowing agent and a polyurethane catalyst. The blowing agent comprises a carbonate source, and optionally water, an alum source and/or an acid source. The mixture is placed in a mold and the mold is closed. The isocyanate source and polyol source react and the carbonate source decomposes to produce carbon dioxide gas to form an integral skin polyurethane in the closed mold.

Abstract: Polycarbonate compositions having excellent mechanical and thermal properties as well as high impact resistance are prepared by mixing an aromatic polycarbonate resin with a structured multiphase composite impact modifier. The structured multiphase composite impact modifier has a core particle of a rubbery particle having a glass transition temperature below -20.degree. C. and a second glassy polymer having a glass transition temperature above 20.degree. C., where the second polymer is present as discontinuous regions on the surface of the core particle.

Abstract: An improvement to the transesterification process for the production of aromatic polycarbonates is disclosed. Into the melt which contains diphenols, carbonic acid diaryl esters and optionally branching agents and at temperatures of 130.degree. C. to 400.degree. C. and in the presence of catalysts there is mixed or passing thereover inert gas in a quantity of at least 0.5 Nm3 per kg of polycarbonate melt.

Abstract: A new method for preparing commercially valuable polymeric ketones is described. The method employs an .alpha.-amiononitrile as a monomeric unit whereby an amorphous, soluble polymer having protected carbonyl moiety is obtained. Upon deprotecting the carbonyl moiety, a crystalline polymeric ketone is obtained. The method allows production of polymeric ketone materials having aromatic, aliphatic or mixed aromatic/aliphatic backbones.

Abstract: A process and apparatus for the solid phase polymerization of polymers wherein cold amorphous polymer is introduced to a crystallizer. Hot heat transfer liquid is employed in the crystallizer for heating the polymer through indirect heat exchange to crystallize the polymer. The crystallized polymer is discharged to a reactor for solid phase polymerization, and then passed from the reactor to a cooler. Cold heat transfer liquid is employed in the cooler to cool the polymer through indirect heat exchange. A forced recirculation closed-loop system for the heat-transfer liquid is provided between the crystallizer and the cooler whereby the heat recovery process is achieved.

Abstract: A polymer including poly(alkylpyridine-2,5-diyl) which has a chemical formula: ##STR1## wherein R is an alkyl group having not less than 3 carbon atoms, and n is a degree of polymerization and is not less than 30, and a process for manufacturing the polymer which includes the steps of (a) providing at least one 2,5-dihalogenated alkylpyridine which includes an alkyl group having not less than 3 carbon atoms; and (b) polymerizing the at least one 2,5-dihalogenated alkylpyridine by adding an effective amount thereto of substance which is effective to remove halogen atoms therefrom, which substance is selected from the group consisting of (a) a metal which is capable of dehalogenating 2,5-dihalogenated alkylpyridine and (b) a compound containing said metal which is capable of dehalogenating 2,5-dihalogenated alkylpyridine.

Abstract: Described herein is a process for synthesizing polybenzazole polymers comprising: (a) contacting a bis(trihalomethyl) organic compound with a polyphosphoric acid under reaction conditions sufficient to convert at least about 25 mole percent of the trihalomethyl groups present to carboxylic acid or carboxylate groups, forming a reaction mixture thereby; and (b) contacting the reaction mixture with an aromatic compound having two o-amino-basic moieties under reaction conditions sufficient to form a polybenzazole polymer.