Abstract: A method of making resin composition having excellent wear properties that includes 50 to 99 wt. % of a polycarbonate resin and from 1 to 50 wt. % of a polyolefin that has been modified with at least one functional group selected from a carboxyl, an acid anhydride, an epoxy groups or mixtures containing at least one of the foregoing functional groups, each based on the total combined weight of the resin composition, exclusive of any filler. The resin composition optionally contains an unmodified polyolefin and/or a bi-functional monomer. The resin composition can be molded into articles having improved wear characteristics. The process is a one-step process that improves the efficiency and/or yield of the resin composition as compared to prior-art two-step processes.

Abstract: A method of making resin composition having excellent wear properties that includes 50 to 99 wt. % of a polycarbonate resin and from 1 to 50 wt. % of a polyolefin that has been modified with at least one functional group selected from a carboxyl, an acid anhydride, an epoxy groups or mixtures containing at least one of the foregoing functional groups, each based on the total combined weight of the resin composition, exclusive of any filler. The resin composition optionally contains an unmodified polyolefin and/or a bi-functional monomer. The resin composition can be molded into articles having improved wear characteristics. The process is a one-step process that improves the efficiency and/or yield of the resin composition as compared to prior-art two-step processes.

Abstract: A method of making resin composition having excellent wear properties that includes 50 to 99 wt. % of a polycarbonate resin and from 1 to 50 wt. % of a polyolefin that has been modified with at least one functional group selected from a carboxyl, an acid anhydride, an epoxy groups or mixtures containing at least one of the foregoing functional groups, each based on the total combined weight of the resin composition, exclusive of any filler. The resin composition optionally contains an unmodified polyolefin and/or a bi-functional monomer. The resin composition can be molded into articles having improved wear characteristics. The process is a one-step process that improves the efficiency and/or yield of the resin composition as compared to prior-art two-step processes.

Abstract: A method of making resin composition having excellent wear properties that includes 50 to 99 wt. % of a polycarbonate resin and from 1 to 50 wt. % of a polyolefin that has been modified with at least one functional group selected from a carboxyl, an acid anhydride, an epoxy groups or mixtures containing at least one of the foregoing functional groups, each based on the total combined weight of the resin composition, exclusive of any filler. The resin composition optionally contains an unmodified polyolefin and/or a bi-functional monomer. The resin composition can be molded into articles having improved wear characteristics. The process is a one-step process that improves the efficiency and/or yield of the resin composition as compared to prior-art two-step processes.

Abstract: A flame retardant thermoplastic composition having excellent physical properties that includes 30 to 90 wt. % of a polycarbonate resin; from 1 to 35 wt. % of an impact modifier; from 0.1 to 15 wt. % of a phosphorus-containing flame retardant, from 1 to 30 wt. % of metal fiber, and from 0.002 to 5 wt. % of a processing additive, each based on the total combined weight of the thermoplastic composition, exclusive of any filler. The processing additive permits flame retardant characteristics to be maintained despite lower levels of flame retardant while the lower levels of flame retardant permit the compositions, and molded samples of these compositions, to have higher HDT and/or impact strengths as compared to compositions having higher levels of flame retardants. A molded sample of the thermoplastic composition is capable of achieving UL94 V0 rating at a thickness of 1.5 mm (±10%). The compositions are useful in forming flame retardant articles having EMI shielding characteristics.

Abstract: A thermoplastic composition comprises polycarbonate, an impact modifier having a pH of about 3 to about 7, and a flame retardant essentially free of bromine and chlorine.

Abstract: It has now been surprisingly found that addition of a phosphorous-containing oxy acid to a glass-filled polycarbonate composition substantially improves its fire retardant performance. Thus, the present invention provides a method for making a flame-retarded glass-filled polycarbonate resin comprising adding to the resin an effective flame-retardant amount of a phosphorous-containing oxy acid. Where appropriate, the melt strength of the polycarbonate is enhanced by the addition of an antidrip agent and the performance can be further enhanced by the addition of a flame retardant. Use of such a composition results in superior fire-retardant performance.

Abstract: A thermoplastic composition comprises polycarbonate, an impact modifier having a pH of about 3 to about 7, and a fire retardant essentially free of bromine and chlorine.

Abstract: Transparent polycarbonate compositions are made from polycarbonate produced in a base-catalyzed melt polymerization reaction to which an acidic quencher has been added in a 1 to 30-fold molar ratio with respect to the amount of initial basic catalyst; and a potassium perfluoralkane sulfonate and cyclic siloxane containing flame-retardant component. In the composition these components work in combination such that the composition achieves a V0 UL flammability rating at a thickness of 2.0 mm, preferably 1.6 mm, and has a haze of no more than 1%.

Abstract: A combination of a potassium salt of a perfluoroalkane sulfonate and a sodium salt of toluene sulfonic acid, preferably in the presence of an antidrip agent to provide high melt strength, act synergistically to provide flame-retarded polycarbonate compositions at low levels. Thus, a flame-retarded polycarbonate resin can be made by adding to the polycarbonate resin an effective flame-retardant amount of a potassium salt of a perfluoroalkane sulfonate and a sodium salt of toluene sulfonic acid. The two salts may be formulated in advance into an additive composition.

Abstract: It has now been surprisingly found that addition of a phosphorous-containing oxy acid to a glass-filled polycarbonate composition substantially improves its fire retardant performance. Thus, the present invention provides a method for making a flame-retarded glass-filled polycarbonate resin comprising adding to the resin an effective flame-retardant amount of a phosphorous-containing oxy acid. Where appropriate, the melt strength of the polycarbonate is enhanced by the addition of an antidrip agent and the performance can be further enhanced by the addition of a flame retardant. Use of such a composition results in superior fire-retardant performance.

Abstract: A combination of a potassium salt of a perfluoroalkane sulfonate and a sodium salt of toluene sulfonic acid, preferably in the presence of an antidrip agent to provide high melt strength, act synergistically to provide flame-retarded polycarbonate compositions at low levels. Thus, a flame-retarded polycarbonate resin can be made by adding to the polycarbonate resin an effective flame-retardant amount of a potassium salt of a perfluoroalkane sulfonate and a sodium salt of toluene sulfonic acid. The two salts may be formulated in advance into an additive composition.

Abstract: A system and method for measuring viscosity, melt flow index (MFI), and melt volume rate (MVR) of a polymer melt in real-time during an extrusion process to provide quick and accurate feedback for process control. The system includes a polymer processing rate sensor (36), a polymer melt temperature sensor (30), an extruder pressure sensor (32), and a die head temperature sensor (34) for taking in-line measurements during the extrusion process. The in-line measurements are made on the main process stream of the polymer melt, with the determination of viscosity, MFI, and MVR based on these measured values and those obtained during a calibration run with polymers having known properties. The invention can be used in any polymer compounding and extrusion process utilizing die opening with any constant geometry for monitoring quality and providing feedback for process control.

Abstract: A method and apparatus for measuring the rheological properties of a polymer melt includes flowing the polymer melt from a first reactor to a device through a conduit at a predetermined flow rate, measuring a first pressure of the polymer melt at a first location in the conduit, measuring a second pressure at a second location downstream from the first location, measuring a temperature at a third location in the conduit, wherein the third location is between the first location and the second location, and calculating the rheological property of the polymer melt as it flows through the conduit. The method and apparatus do not require diversion of the polymer melt from the main process stream.

Abstract: A system and method for measuring viscosity, melt flow index (MFI), and melt volume rate (MVR) of a polymer melt in real-time during an extrusion process to provide quick and accurate feedback for process control. The system includes a polymer processing rate sensor (36), a polymer melt temperature sensor (30), an extruder pressure sensor (32), and a die head temperature sensor (34) for taking in-line measurements during the extrusion process. The in-line measurements are made on the main process stream of the polymer melt, with the determination of viscosity, MFI, and MVR based on these measured values and those obtained during a calibration run with polymers having known properties. The invention can be used in any polymer compounding and extrusion process utilizing die opening with any constant geometry for monitoring quality and providing feedback for process control.

Abstract: A method and apparatus for measuring the rheological properties of a polymer melt includes flowing the polymer melt from a first reactor to a device through a conduit at a predetermined flow rate, measuring a first pressure of the polymer melt at a first location in the conduit, measuring a second pressure at a second location downstream from the first location, measuring a temperature at a third location in the conduit, wherein the third location is between the first location and the second location, and calculating the Theological property of the polymer melt as it flows through the conduit. The method and apparatus do not require diversion of the polymer melt from the main process stream.

Abstract: A system for providing process control information, such as viscosity, concerning a polymer melt comprises a means containing a polymer melt under pressure; means for diverting a stream of the polymer melt directly from said containing means to and through an orifice of predetermined geometrical shape wherein the flow of said diverted portion to and through said orifice is unobstructed and directly dependent on the pressure of said main polymer melt wherein the cross sectional area is sized to permit the flow of said diverted melt polymer therethrough absence additional independent means acting on said diverted melt polymer for increasing flow through said orifice; temperature sensing means for measuring the temperature of the diverted melt stream and producing a resultant temperature signal; pressure sensing means for measuring the pressure of the diverted melt stream and producing a resultant pressure signal, said pressure signal being directly dependent on the pressure of polymer in said main polymer melt

Abstract: Linear polyesters are branched by transesterification with resins having the formula: ##STR1## wherein n is an integer of from 1 to 10.

Abstract: The disclosure describes reacting a multi-functional phenolic or carboxylic branching agent with a transesterification catalyst to form an organic salt prior to reactive extrusion of said organic salt branching agent with linear polycarbonate resin as a means to dramatically increase the efficiency of the branching agent in the preparation of branched polycarbonate.

Abstract: A system for providing process control information, such as viscosity, concerning a polymer melt comprises a means containing a polymer melt under pressure; means for diverting a stream of the polymer melt directly from said containing means to and through an orifice of predetermined geometrical shape wherein the flow of said diverted portion to and through said orifice is unobstructed and directly dependent on the pressure of said main polymer melt wherein the cross sectional area is sized to permit the flow of said diverted melt polymer therethrough absence additional independent means acting on said diverted melt polymer for increasing flow through said orifice; temperature sensing means for measuring the temperature of the diverted melt stream and producing a resultant temperature signal; pressure sensing means for measuring the pressure of the diverted melt stream and producing a resultant pressure signal, said pressure signal being directly dependent on the pressure of polymer in said main polymer melt