摘要:
A polyphosphonate having an acid value of about 5.5 mg KOH/g or less and represented by Formula 1: wherein: A is a single bond, C1 to C5 alkylene, C1 to C5 alkylidene, C5 to C6 cycloalkylidene, —S— or —SO2-, R is substituted or unsubstituted C6 to C20 aryl or substituted or unsubstituted C6 to C20 aryloxy, R1 and R2 are the same or different and are each independently substituted or unsubstituted C1 to C6 alkyl, substituted or unsubstituted C3 to C6 cycloalkyl, substituted or unsubstituted C6 to C 12 aryl or halogen, a and b are the same or different and are each independently an integer from about 0 to about 4, and n is an integer from about 1 to about 500.
摘要:
Disclosed herein is a flame retardant and impact modifier represented by the following Chemical Formula 1. The flame retardant and impact modifier may improve heat resistance and flowability as well as flame retardancy and impact strength of a thermoplastic resin composition. The present invention also provides a method of preparing the foregoing flame retardant and impact modifier and a thermoplastic resin composition including the flame retardant and impact modifier.
摘要:
Disclosed herein is a sterically hindered phenolic phosphonate resin compound represented by the following Chemical Formula 1. The present invention also provides a polycarbonate resin composition including the sterically hindered phenolic phosphonate resin compound as a flame retardant. wherein R1 is a C1-C6 alkyl group or a C6-C14 aryl group; each R2 is independently a C1-C6 linear alkyl group or a C3-C6 branched alkyl group; and each n is independently 1-3.
摘要:
Disclosed herein is a flame retardant thermoplastic resin composition having excellent weatherability comprising (A) about 100 parts by weight of a rubber modified aromatic vinyl resin comprising (a1) about 15 to about 100% by weight of a grafted copolymer resin prepared by graft-polymerizing about 5 to 65% by weight of a rubbery polymer, about 10 to 95% by weight of an aromatic vinyl monomer and about 0 to 40% by weight of a monomer copolymerizable with said aromatic vinyl monomer; and (a2) about 0 to 85% by weight of a copolymer resin prepared by polymerizing about 40 to 90% by weight of an aromatic vinyl monomer and about 10 to 60% by weight of a monomer copolymerizable with said aromatic vinyl monomer; (B) about 0.1 to about 10 parts by weight of a ring-shaped alkyl phosphonate ester compound; and (C) about 0.05 to about 3 parts by weight of a HALS compound.
摘要:
A developing unit for an image forming apparatus using a two-property developer that induces a magnetic attraction force based on the slope of a curved line representing the magnetism of each magnetic pole of a magnetic field generating part of a developing roller and determining a developer-regulating position where the changes of the magnetic attraction force are minor based on the magnetic attraction force in order to assure stable transfer of the developer to a photoconductive medium.
摘要:
An apparatus for driving a photosensitive belt is applied to an electrophotographic printer in which a continuously moving photosensitive belt is scanned by an optical beam, thereby forming a latent image on the photosensitive belt for a developer liquid to be applied. The apparatus for driving the photosensitive belt includes a photosensor, a controller and a stepping motor. The photosensor is installed at a position near to the rear end of the scanning area for generating a pulse signal whenever a unit scan line of the photosensitive belt has been completely scanned by the optical beam. The controller processes the pulse signal and drives the stepping motor to rotate a predetermined angle to thereby move the photosensitive belt a unit scan line distance whenever the driving pulse signal from the controller is applied thereto. In this way, the speed of the photosensitive belt will not be excessive so as to prevent complete scanning of each scan line of the optical beam.
摘要:
A washing machine includes a water tub, a spin basket mounted inside the water tub, and a pulsator mounted in the spin basket. A drive transmission includes a hollow dehydrating shaft and a laundering shaft disposed coaxially therein. The hollow dehydrating shaft is connected to the spin basket, and the laundering shaft is connected to the pulsator. A connecting gear is mounted on the dehydrating shaft for vertical movement therealong. In an upper position, the connecting gear meshes with fixed teeth to prevent the spin basket from rotating. In a lower position, the connecting gear causes the laundering shaft and dehydrating shaft to be interconnected for common rotation. The connecting gear is rotatable slightly relative to the laundering shaft to accommodate meshing of gear teeth in response to upper and lower movement of the connecting gear. Springs are provided which act between the dehydrating shaft and the connecting gear and which are yieldable to permit the slight rotation of the connecting gear.
摘要:
A conic fluid bearing includes a bush fixed to a rotary body. The bush has upper and lower portions on which conic cavities are opposingly formed, respectively. Upper and lower cones fit on a shaft fixed to a fixed body and are rotatably combined with said upper and lower conic cavities, respectively.
摘要:
A remote control unit of an electronic apparatus has a receiving device provided in a cabinet of the electronic apparatus and a remote controller having a plurality of control buttons for controlling the electronic apparatus. The receiving device has a transparent module and a plurality of receiving sensors disposed in the transparent module. A housing encloses the module and protrudes out of the upper section of the cabinet. The receiving device can be protruded from or retracted into the upper section of the cabinet allowing the electronic apparatus to be controlled from any direction.