Abstract:
Disclosed herein are methods and compositions of blended polycarbonate compositions with improved mold release characteristics. The resulting compositions, comprising one or more polycarbonate polymers, an impact modifier, a polycarbonate-siloxane copolymer, and an alkyl sulfonate salt, can be used in the manufacture of articles requiring improved mold release characteristics while still retaining the advantageous physical properties of blended polycarbonate compositions. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.
Abstract:
A process for making ultra-fine particles of a high performance polymer in a yield greater than 90%, which includes dissolving the high performance polymer in an organic solvent capable of dissolving the polymer to form a solution; emulsifying the solution by combining the solution with water and a surfactant to form an emulsion; transferring the emulsion into a receiving water containing a surfactant to remove the organic solvent and form a slurry; and recovering particles of less than 75 microns in diameter in a yield greater than 90%.
Abstract:
Photoactive additives are disclosed. The additive is formed from the reaction of a dihydroxybenzophenone, one or more linker moieties having functional groups that react with the phenolic groups, a diol chain extender, and an end-capping agent. If desired, a secondary linker moiety can be used. When added to a base polymeric resin, the photoactive additive permits crosslinking when exposed to ultraviolet light.
Abstract:
Photoactive additives, such as cross-linkable polycarbonate resins, are disclosed. The additive is formed from the reaction of a monohydroxybenzophenone, a dihydroxybenzophenone, a diol chain extender, and one or more linker moieties having functional groups that react with the phenolic groups on the other ingredients. If desired, a secondary linker moiety and/or an end-capping agent can be used. When added to a base polymeric resin, the photoactive additive permits crosslinking when exposed to ultraviolet light.
Abstract:
Processes involving wetting fibers with an aqueous dispersion of micronized thermoplastic powders; processes for producing an aqueous dispersion of micronized thermoplastic powders; processes of chemically surface cross-linking micronized particles; and articles of produced therefrom.
Abstract:
Polymeric blends having improved flame retardance properties and good ductility at low temperatures are disclosed. The blend is formed from (A) a photoactive additive that is a cross-linkable polycarbonate resin containing a photoactive group derived from a dihydroxybenzophenone; and (B) a polymer resin which is different from the photoactive additive. The additive can be a compound, oligomer, or polymer. When exposed to ultraviolet light, crosslinking will occur between the photoactive additive and the polymer resin, enhancing the chemical resistance and flame retardance while maintaining ductility.
Abstract:
A substrate for controlling the transmission of light therethrough has a light reflecting layer affixed to a light transmitting layer. The light reflecting layer is divided into a plurality of subdivisions arranged in a plurality of rows. Each subdivision has an area, is spaced apart from adjacent subdivisions, and has a different thickness than the light transmitting layer between the subdivisions. By controlling the size, spacing and thickness of the subdivisions and the thickness of the light reflecting layer between the subdivisions it is possible to control the light transmitted through and reflected from the substrate. A method of making the substrate by ablating the light reflecting layer is also disclosed.
Abstract:
Disclosed herein is a reinforced composition comprising: 55 to 80 wt % of a compatibilized blend of a polyphthalamide and a poly(phenylene ether) wherein said compatibilized blend is formed from a mixture of polyphthalamide and poly(phenylene ether) in a ratio of between 1.5:1 and 7.0:1, and a functionalizing agent in an amount sufficient to effect compatibilization; and 20 to 45 wt % of a nylon glass fiber, wherein the composition contains less than 0.1 wt % of phosphinates and less than 0.1 wt % of impact modifiers and weight percent is based on the total weight of the composition.
Abstract:
In an embodiment, a method of making a heat sink assembly (10) can comprise: forming an heat sink assembly (10) comprising a polymer heat sink (14) around a metal insert (12), the polymer heat sink (14) comprising a thermally conductive polymer material, wherein the heat sink assembly (10) has a contact pressure between the polymer heat sink (14) and the metal insert (12); and increasing the contact pressure. In an embodiment, a method of making a heat sink assembly (10), comprises: heating a mold and subsequently introducing a metal insert to the mold, wherein the metal insert has an insert temperature of 30° C. to 70° C. when it is inserted into the mold; closing the mold; and in less than or equal to 10 seconds of closing the mold, over-molding the metal insert with a thermally conductive polymer material to form a heat sink assembly (10).
Abstract:
A microwell plate comprises a skirt and frame portion having a top surface and a bottom surface, and having a plurality of holes; and a well and deck portion comprising a plurality of wells integrated with a planar deck; wherein the well and deck portion is overmolded or adhered onto the skirt and frame portion such that the plurality of wells extends through the plurality of holes in the top surface of the skirt and frame portion; and wherein the well and deck portion is formed from a thermoplastic composition including a poly(aliphatic ester)-polycarbonate comprising soft block ester units, derived from monomers comprising an alpha, omega C6-20 aliphatic dicarboxylic acid or derivative thereof, a dihydroxyaromatic compound, and a carbonate source.