Showing papers on "Polycarbonate published in 1983"

Polycarbonate plastic panel

Abstract: 1. Plastics board, consisting of a core layer of polycarbonate plastics containing not more than 0.5% by weight of a UV absorber, and consisting, on at least one side of the core layer, of a covering layer of plastics, coextruded with the core layer, containing at least 3% by weight of a UV absorber, characterised in that the covering layer consists of polycarbonate plastics.

Polyetherimide-polycarbonate blends

Abstract: Disclosed are blends of (a) a polyetherimide and (b) a thermoplastic polycarbonate. The blends exhibit a higher heat distortion temperature and an improved flexural strength and tensile strength over the polycarbonate component alone and have a higher impact strength than that associated with the polyetherimide component of the blends. In addition, the blends may exhibit good flame resistance.

Low gloss carbonate polymer blends

Abstract: Blends of carbonate polymer, such as a polycarbonate of bisphenol-A, and a rubber-modified copolymer, such as an acrylonitrile/butadiene/styrene (ABS) resin prepared by mass, bulk or mass suspension polymerization techniques, or by agglomerating particles prepared by emulsion polymerization techniques, exhibit good physical properties and a low gloss finish. Such blends are particularly useful in the manufacture of molded parts. Such blends are color stable and exhibit small amounts of yellowing.

Microcavity formation in engineering polymers exposed to hot water

Abstract: Microcavity formation in engineering polymers exposed to boiling water has recently been noted in the technical literature. This study describes this observation and presents photomicrographs of the microcavity morphology. The microcavities are lens-shaped cracks emitting from a nucleation site with regular concentric ridges observed at regular intervals with characteristics similar to fatigue cracking. Cyclic exposure [intervals of hot (96deg;C) followed by cold (23°C) water immersion] was found to significantly increase the microcavity formation in specific polymers. Polymers studied under these conditions included polycarbonate, polysulfone, poly(ether sulfone), and polyetherimide. Only polycarbonate and polyetherimide exhibited internal crack formation. The microcavities of polyetherimide were quite different than those of polycarbonate as the cracks were concentrated in regions of highest molded-in stress. When polysulfone was purposely spiked with 0.1 wt % NaCl inclusions, microcavity formation was observed but at a magnitude significantly lower than that of polycarbonate (unmodified). A hypothesis is presented to explain this failure mechanism in polycarbonate. Localized regions, (nucleation sites) of higher water solubility can result in higher internal pressure and stress-induced hydrolysis causing microcavity formation. Additional internal pressure (cyclic conditions) can result from water phase separation yielding further crack propagation. Polycarbonate exhibits a larger difference in equilibrium water solubility between 23°C and 96°C than do the other plymers studied, thus yielding a greater potential for internal pressure resulting from phase separation.

Heat-resistant foamed polyesters

Abstract: There are provided heat-resistant, foamed, crystalline polyesters, such as polyethylene terephthalate foamed with a polycarbonate and subjected to crystallization annealing. which are particularly useful for forming light weight, ovenable food containers.

Composition based on aliphatic polycarbonates with acrylic or metacrylic end groups and capable of being cross-linked in the presence of radicalic initiators

Abstract: Composition based on aliphatic polycarbonate with acrylic or metacrylic end groups cross-linkable in the presence of radicalic initiators obtained by functionalizing with acrylic or metacrylic groups a mixture consisting of diols, polyols and their -OH-terminated oligomeric derivatives containing in their molecules carbonate groups.

Polycarbonate molding compositions having improved flame retardance

Abstract: The present invention relates to polycarbonate molding compositions containing additives of alkali or alkaline earth metal salts, tetrahalogenophthalimides and optional glass fibers, characterized in that they contain additive amounts of bromine.

Blends of polyetherimides and organopolysiloxane-polycarbonate block copolymers

Abstract: Disclosed are blends of (a) a polyetherimide and (b) an organopolysiloxane - polycarbonate block copolymer. Such blends exhibit a good combination impact strength and flexural properties particularly at relatively high proportions of polyetherimide, and elastomeric behavior at relative high concentrations of the block copolymer of organopolysiloxane and polycarbonate.

Molecular dynamics of polycarbonate-diluent systems: applications of high-resolution carbon-13 solid-state NMR

Abstract: Influence d'adjuvants miscibles, de faible masse moleculaire sur la dynamique de chaine de polycarbonate de bisphenol A, a l'etat vitreux, par spectrometrie RMN, a 25°C

Multilayered hollow polycarbonate containers

Abstract: Multilayered hollow polycarbonate containers comprised of: (i) at least one inner polycarbonate layer; (ii) at least one outer polycarbonate layer; and (iii) at least one intermediate layer between said inner polycarbonate layer and said outer polycarbonate layer comprised of a thermoplastic resin exhibiting gas-barrier properties. The containers are formed by coextrusion blow-molding.

Thermoplastic resin composition

Abstract: PURPOSE:To provide the titled compsn. having excellent impact resistance and moldability, by blending a specified block copolymer with a polycarbonate resin or a modified polyphenylene oxide resin. CONSTITUTION:1-20pts.wt. block copolymer obtd. from 10-60pts.wt. arom. vinyl compd. such as styrene and 90-40pts.wt. conjugated diene such as 1,3- butadiene, is blended with 100pts.wt. polycarbonate resin or modified polyphenylene oxide resin.

Polyurethanes prepared from polycarbonates

Abstract: A process for the production of a polycarbonate glycol wherein a cyclic carbonate is catalyzed at elevated temperature by a cationic initiator. Compounds of structure (I) ##STR1## where R is alkylene, R' and R" are independently hydrogen, alkyl, alkaryl, aralkyl, or aryl, are heated at an elevated temperature in the presence of cationic initiators such as trimethyl aluminum to form a polymer. Production of a glycol product is assured by subsequent heating at about 200°-220° C. to form a polymer containing carbonate units of ##STR2## and having hydroxy end units bonded to a carbon not part of a carbonate function. The molecular weight of polycarbonate glycol is preferably at least about 1,000. Valuable new prepolymer mixes and polyurethanes may be prepared using the novel polycarbonate glycols of the invention.

Highly anisotropic conductive materials: polymers doped with crystalline charge-transfer complexes

Abstract: A method of obtaining polymeric materials showing high anisotropy of electrical conductivity (up to 108) is reported. Electrical properties of polycarbonate films doped with TTT-TCNQ crystalline CT complex obtained using this method are discussed.

Thermoplastic moulding compositions of polycarbonate, polyalkylene terephthalate, graft copolymer and polyethylene

Abstract: Moulding compositions of aromatic polycarbonate, polyalkylene terephthalate and a certain graft copolymer which may be processed into mouldings characterized by high multiaxial impact strength, exhibit an increased Vicat B-temperature if they contain a low amount of an ethylene homo- or copolymer.

Synthesis of polycarbonate from dialkyl carbonate and bisphenol diester

Abstract: Polycarbonates are formed by the interaction of a bisphenol diester, carbon monoxide and oxygen The initial polycarbonate product is an oligomer which, upon heat treatment, polymerizes to a high molecular weight polycarbonate The products produced according to the present invention are chainstopped prior to heat treatment, making them less thermally and oxidatively sensitive

Additive concentrate for polyester compositions and method of addition

Abstract: Thermoplastic compositions of a polyester and/or polycarbonate resin, an acrylic core-shell impact modifier and a stabilizer package are provided by an improved method in which the imput modifier and stabilizer components are first preblended and the preblend is then admixed with the polyester and/or polycarbonate. The resultant blend composition retains good properties even without the use of high amounts of the stabilizers.

Conductive thermoplastic compositions

Abstract: Thermoplastic compositions comprising a polycarbonate resin, a graft copolymer and conductive particles are provided suitable for the preparation of molded articles characterized in that they provide an improved level of EMI shielding.

Phenylene ether copolymer aromatic polycarbonate blends

Abstract: Blends comprising an aromatic polycarbonate and a phenylene ether copolymer resin exhibiting good toughness and improved high temperature end-use performance as measured by heat distortion temperature.

Solid spherical glass particle impingement studies of plastic materials

Abstract: Erosion experiments on polymethyl methacrylate (PMMA), polycarbonate, and polytetrafluoroethylene (PTFE) were conducted with spherical glass beads impacting at normal incidence. Optical and scanning electron microscopic studies and surface profile measurements were made on specimens at predetermined test intervals. During the initial stage of damage to PMMA and polycarbonate, material expands or builds up above the original surface. However, this buildup disappears as testing progresses. Little or no buildup was observed on PTFE. PTFE is observed to be the most resistant material to erosion and PMMA the least. At low impact pressures, material removal mechanisms are believed to be similar to those for metallic materials. However, at higher pressures, surface melting is indicated at the center of impact. Deformation and fatigue appear to play major roles in the material removal process with possible melting or softening.

Copolyester-carbonate blends

Abstract: Thermoplastic compositions comprised of, in physical admixture, from: (i) about 1 to about 85 weight percent of at least one randomly branched aromatic polycarbonate resin; and (ii) about 15 to about 99 weight percent of at least one aromatic copolyester-carbonate resin.

Polycarbonate of spiro dihydric phenol

Abstract: Polycarbonates exhibiting improved heat distortion temperatures which are comprised of the polymerized coreaction products of (i) a carbonate precursor, and (ii) at least one particular spiro dihydric phenol. These carbonate polymers are useful in the production of molded articles, sheet glazing materials, and films.

Laminates comprising plasticized polyvinyl butyral interlayers

Abstract: In a polyvinyl butyral (PVB) sheet plasticized with a multiester of an alcohol having 2 to 4 hydroxyl groups and a C 16 to C 20 unsaturated fatty acid having a hydroxyl group attached to the acid molecule, which sheet does not craze polycarbonate or polyacrylate when in contact therewith, the addition of a synergistically effective amount of a monoester of a glycol and such C 16 to C 20 acid improves the low temperature penetration resistance and adhesion properties of such sheet without significant loss in its resistance to stress cracking polycarbonate or polyacrylate in a laminated glass assembly.

Stabilizer compositions, their use for stabilizing thermoplastic polycarbonates and stabilized thermoplastic polycarbonates

Abstract: The present invention is directed to stabilizer compositions or thermoplastic polycarbonates based on phosphites and siloxane-oxetane compounds. These stabilizers protect the polycarbonate against heat and oxidative degradation, and in addition, increase the hydrolysis resistance of the polycarbonate. The present invention is also directed to a process for stabilizing polycarbonate and to the stabilized polycarbonate produced therefrom.

A plasticized thermoplastic polymer

Abstract: Described herein is a plasticized thermoplastic polymer composition comprising in admixture, a thermoplastic polymer selected from a polyarylate, a polyetherimide, an aromatic polycarbonate, a poly(aryl ether) having a molecular weight in excess of 10,000 and a plasticizing amount of a poly(aryl ether) having a molecular weight of from about 1,000 to about 5,000.

Self-extinguishing polycarbonate composition

Abstract: Self-extinguishing polycarbonates essentially consisting of mixtures of polycarbonates with at least one salt of metals of the I and/or of the II A and B Groups of the Elements Periodic Table, of particular inorganic compounds, and possibly with at least one halogenated organic compound.

Cellulose ester-aliphatic polycarbonate thermoplastic moulding compositions

Abstract: Thermoplastic moulding compositions consisting of from 1 to 99% by weight of at least one cellulose ester or cellulose mixed ester, from 99 to 1% by weight of an aliphatic polyester or polyether containing carbonate groups and, optionally, standard auxiliaries and additives.

Modified thermoplastic polyester molding compositions and articles molded therefrom

Abstract: Thermoplastic molding compositions which comprise (a) a poly(C 2-6 alkylene terephthalate) resin and a minor proportion of (b) an aromatic polycarbonate resin which may also contain silicone units in combination with (c) a rubbery thermoplastic vinyl polymer which preferably contains olefinic units or a rubbery poly(carbonate-co-ester) resin, provide molded articles of improved impact resistance. Optionally the compositions contain a polyethylene resin as a processing and a fibrous reinforcing agent, a mineral filler, and a flame retardant. In preferred embodiments, articles molded from the compositions possess improved impact resistance, lower specific gravity, good tensile strength, improved resistance to distortion at elevated temperatures under load, and improved receptivity for colorants.

Polycarbonate resin molding composition

Abstract: This application discloses novel thermoplastic polycarbonate molding compositions which include a multiphase composite interpolymer; a copolymer of acrylonitrile, butadiene and an alkenyl aromatic compound; and an olefin-acrylate copolymer

Process for producing aromatic polyester polycarbonate particles

Abstract: A process for producing aromatic polyester polycarbonate particles from a methylene chloride solution of an aromatic polyester polycarbonate comprises continuously supplying the methylene chloride solution of an aromatic polyester polycarbonate to a particle-forming tank, heating it while maintaining it in a suspended state in water to evaporate methylene chloride and to form aromatic polyester polycarbonate particles, subjecting at least a part of the resulting aqueous slurry withdrawn from the particle-forming tank and containing the aromatic polyester polycarbonate particles to wet pulverization treatment and recycling the treated slurry to the particle-forming tank.