摘要:
A flame retardant thermoplastic composition having excellent physical properties that includes 20 to 90 wt. % of a polycarbonate resin; from 1 to 35 wt. % of an impact modifier; from 0.5 to 30 wt. % of a polysiloxane-polycarbonate copolymer including from 8 to 30 wt. % polydimethylsiloxane units or the equivalent molar amount of other diorganosiloxane units; from 0.5 to 20 wt. % of a phosphorus-containing flame retardant, and from 3 to 30 wt. % of metal fiber, each based on the total combined weight of the thermoplastic composition, exclusive of any filler. In one embodiment, a molded sample of the thermoplastic composition having a thickness of 3.0 mm (±10%) has an EMI shielding of at least 20 dB. In addition, a molded sample of the thermoplastic composition is capable of achieving UL94 V0 or V1 rating at a thickness of 1.5 mm (±10%). The compositions are useful in forming flame retardant articles having EMI shielding characteristics.
摘要:
Disclosed herein are compositions comprising a. from 35 to 80 vol % of a thermoplastic polymer; b. from 5 to 45 vol % of a low thermally conductive, electrically insulative filler with an intrinsic thermal conductivity of from 10 to 30 W/mK; c. from 5 to 15 vol % of a high thermally conductive, electrically insulative filler with an intrinsic thermal conductivity greater than or equal to 50 W/mK; and d. from 5 to 15 vol % of a high thermally conductive, electrically conductive filler with an intrinsic thermal conductivity greater than or equal to 50 W/mK, wherein the composition is characterized by: i. a thermal conductivity of at least 1.0 W/mK; and ii. a volume resistivity of at least 107 Ohm.cm. Also disclosed are articles and methods of use therefor.
摘要:
Disclosed herein are compositions comprising a. from 35 to 80 vol % of a thermoplastic polymer; b. from 5 to 45 vol % of a thermally insulative filler with an intrinsic thermal conductivity less than or equal to 10 W/mK; and c. from 5 to 15 vol % of a thermally conductive filler with an intrinsic thermal conductivity greater than or equal to 50 W/mK, wherein the composition is characterized by: i. a thermal conductivity of at least 1.0 W/mK; ii. a thermal conductivity of at least 7 times the total filler volume fraction times the thermal conductivity of the pure thermoplastic polymer; and iii. a volume resistivity of at least 107 Ohm·cm. Also disclosed are articles and methods of use therefor.
摘要:
Disclosed herein are compositions comprising a. from 35 to 80 vol % of a thermoplastic polymer; b. from 5 to 45 vol % of a low thermally conductive, electrically insulative filler with an intrinsic thermal conductivity of from 10 to 30 W/mK; c. from 5 to 15 vol % of a high thermally conductive, electrically insulative filler with an intrinsic thermal conductivity greater than or equal to 50 W/mK; and d. from 5 to 15 vol % of a high thermally conductive, electrically conductive filler with an intrinsic thermal conductivity greater than or equal to 50 W/mK, wherein the composition is characterized by: i. a thermal conductivity of at least 1.0 W/mK; and ii. a volume resistivity of at least 107 Ohm.cm. Also disclosed are articles and methods of use therefor.
摘要:
Disclosed herein are compositions comprising a. from 35 to 80 vol % of a thermoplastic polymer; b. from 5 to 45 vol % of a thermally insulative filler with an intrinsic thermal conductivity less than or equal to 10 W/mK; and c. from 5 to 15 vol % of a thermally conductive filler with an intrinsic thermal conductivity greater than or equal to 50 W/mK, wherein the composition is characterized by: i. a thermal conductivity of at least 1.0 W/mK; ii. a thermal conductivity of at least 7 times the total filler volume fraction times the thermal conductivity of the pure thermoplastic polymer; and iii. a volume resistivity of at least 107 Ohm.cm. Also disclosed are articles and methods of use therefor.
摘要:
In a process of making a magnetoresistive memory device, a mask layout is produced by use of any suitable design tool. The mask layout is laid out in grids having a central grid forming a central section and grids forming bit end sections, and the grids of the bit end sections are rectangles. A mask is made by use of the mask layout, and the mask has stepped bit ends. The mask is used to make a magnetic storage layer having tapered bit ends, to make a magnetic sense layer having tapered bit ends, and to make a non-magnetic layer having tapered bit ends. The non-magnetic layer is between the magnetic sense layer and the magnetic storage layer.
摘要:
Polymer compositions having improved electromagnetic (EMI) shielding properties under high temperature are disclosed. The polymer compositions comprise a thermoplastic polymer, stainless steel fiber, and optionally one or more of glass fiber, a conductive filler, a second polymer, and other additives. The disclosed compositions maintain heat resistance and other mechanical properties under high temperatures.