Provided is a method for manufacturing a preform (1). The method includes injecting into a cavity of a mold through the gate: (i) a first colored resin (R1) for a first predetermined time period, and (ii) a second colored resin (R2), having a color different from that of the first colored resin, for a second predetermined time period.

A powder for solid freeform fabrication includes a first resin particle and a second resin particle, wherein MFR2 is greater than MFR1 and a ratio of MFR2 to MFR1 is from 2 to 5, where MFR1 represents a melt mass-flow rate (MFR) of the first resin particle and MFR2 represents a melt mass-flow rate of the second resin particle.

A functional polymeric cutting edge structure and methods for manufacturing cutting edge structures using polymeric materials are provided. A razor blade for use in a razor cartridge or a blade box for assembly in a razor cartridge frame may be formed using the present invention.

A method of the selection, modification of existing, and/or creation of polyester based polymer materials, which provide improved response to the application of local shear and/or extensional deformation inside the polyester based polymer melt in injection stretch blow molding, is disclosed. A method for manufacturing a polymer article is also provided including injecting a molten polyester based polymer in a preform mold for converting it in a preform while applying shear and/or extensional deformation on the polyester based polymer melt. Applying shear and/or extensional deformation on the polyester based polymer melt includes modifying the flow path of the molten polymer as a function of local pressure profile over at least part of the flow path. The local pressure profile is determined as a function of optimized response of the polyester based polymer melt to the applied local shear and/or extensional deformation over at least said part of the flow path.

A packaging material including a polymeric film surrounding a plastic mass form material. In embodiments, methods include packaging sticky plastic mass form polymers within a polymeric film to prevent agglomeration. Processes include the use of a polymeric film composition that is compatible with the core plastic mass form. The polymeric film can be applied to the plastic mass form through continuous coextrusion, as a film through a hot melt form, fill, and seal process, or as a sealed film bag for inclusion of cooled and coated or uncoated solid sticky plastic material shapes.

A method of producing a sealed structure, the method including: preparing a substrate and a curable resin composition in a liquid form; and sealing the substrate with the curable resin composition, to form a sealed body including the substrate and a cured product of the curable resin composition. The sealing step includes: printing the curable resin composition onto the substrate, to cover the substrate with a first coating film of the curable resin composition; and compression-molding the first coating film and the substrate together using a mold, with a pressing surface of the mold abut against the first coating film, to convert the first coating film into a second coating film. A ratio of a projected area S1 of the first coating film onto the substrate to a projected area S2 of the second coating film onto the substrate: S1/S2 is 0.9 or more.

A white polyester film and a method for manufacturing the same are provided. The method for manufacturing the white polyester film includes: providing a recycled polyester material; physically regenerating a part of the recycled polyester material to form physically regenerated polyester chips having a first intrinsic viscosity; chemically regenerating another part of the recycled polyester material to form chemically regenerated polyester chips having a second intrinsic viscosity less than the first intrinsic viscosity; mixing white regenerated polyester chips, the physically regenerated polyester chips, and the chemically regenerated polyester chips according to a predetermined intrinsic viscosity so as to form a polyester masterbatch material; melting and extruding the polyester masterbatch material to obtain the white polyester film having the predetermined intrinsic viscosity.

The invention relates to a process for the production of a non-fibrous drawn polymer tape, said process comprising the steps: a) compacting a polymer powder in a press to form a compacted polymer bed; b) calendering said compacted polymer bed to form an oriented polymer tape; and c) drawing said oriented polymer tape to form a highly oriented polymer tape; characterized in that step a) comprises compacting the polymer powder at a temperature and pressure such that from 0.1 to 20 wt. % of the polymer powder as measured by DSC is melted. The invention also relates to a tape obtainable by the above process, and a monolayer, multilayered material sheet and ballistic resistant article comprising such a tape.

A diffraction light guide plate comprising an optical layer having diffraction lattice pattern formed as an integrated structure without an interface on one surface thereof, where the optical layer having diffraction lattice pattern is a continuous phase of polymer comprising an episulfide compound, a thiol compound, and an aromatic cyclic compound having two or more hydroxyl groups, the diffraction light guide plate having excellent thickness uniformity and flatness as well as low haze and excellent visibility, and excellent mechanical properties such as pencil hardness and strength, and a method for manufacturing the diffraction light guide plate.

A black polyester film and a method for manufacturing the same are provided. The method for manufacturing the black polyester film includes: providing a recycled polyester material; physically regenerating a part of the recycled polyester material to form physically regenerated polyester chips having a first intrinsic viscosity; chemically regenerating another part of the recycled polyester material to form chemically regenerated polyester chips having a second intrinsic viscosity lower than the first intrinsic viscosity; mixing black regenerated polyester chips, the physically regenerated polyester chips, and the chemically regenerated polyester chips according to a predetermined intrinsic viscosity so as to form a polyester chip raw material; melting and then extruding the polyester chips raw material to form the black polyester film having the predetermined intrinsic viscosity.