Polycarbonate resin powder and method for transporting same

Patent metadata

Field	Value
Publication number	US-10640306-B2
Application number	US-201815894649-A
Country	US
Kind code	B2
Filing date	Feb 12, 2018
Priority date	Nov 17, 2014
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

Provided is a polycarbonate resin powder, including a polycarbonate-polyorganosiloxane copolymer, in which an amount of particles each having a particle diameter of 300 μm or less in an entirety of the powder is 60 mass % or less.

First claim

The invention claimed is:

1. A method of transporting a polycarbonate resin powder, the method comprising
pneumatically transporting the polycarbonate resin powder, and
separating the gas and the powder with a separator, wherein the separator has a filter,
wherein the filter comprises a bag filter, and the bag filter comprises a filter cloth having a polyester substrate coated with polytetrafluoroethylene.

2. The method of transporting a polycarbonate resin powder according to claim 1 , wherein the pneumatically transporting is performed at a gas velocity of from 7 m/s to 30 m/s.

3. The method of transporting a polycarbonate resin powder according to claim 1 , wherein the pneumatically transporting is performed using nitrogen as a gas.

4. The method of transporting a polycarbonate resin powder according to claim 1 , wherein the filter cloth has a thickness of from 1 mm to 3 mm, a mass per unit area of from 300 g/m 2 to 600 g/m 2 , and an air permeability of from 3 cm/s to 10 cm/s.

5. A method of transporting a polycarbonate resin powder, the method comprising:
pneumatically transporting the polycarbonate resin powder,
separating the gas and the powder with a separator, wherein the separator has a filter,
wherein the filter comprises a bag filter, and the bag filter comprises a filter cloth having a polyester substrate coated with polytetrafluoroethylene,
the polycarbonate resin powder, comprising a polycarbonate-polyorganosiloxane copolymer comprising:
a polycarbonate block (A) having a repeating unit represented by the following general formula (I); and
a polyorganosiloxane block (B) having a repeating unit represented by the following general formula (II),
wherein an amount of particles each having a particle diameter of 300 μm or less in an entirety of the powder is 60 mass % or less:

wherein:
R 1 and R 2 each independently represent a halogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms, X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, a fluorenediyl group, an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, —S—, —SO—, —SO 2 —, —O—, or —CO—, and a and b each independently represent an integer of from 0 to 4; and
R 3 and R 4 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and n represents a total number of siloxane repeating units in the polyorganosiloxane block.

6. The method of transporting a polycarbonate resin powder according to claim 5 , wherein the pneumatically transporting is performed at a gas velocity of from 7 m/s to 30 m/s.

7. The method of transporting a polycarbonate resin powder according to claim 5 , wherein the pneumatically transporting is performed using nitrogen as a gas.

8. The method of transporting a polycarbonate resin powder according to claim 5 , wherein the filter cloth has a thickness of from 1 mm to 3 mm, a mass per unit area of from 300 g/m 2 to 600 g/m 2 , and an air permeability of from 3 cm/s to 10 cm/s.

Assignees

• Idemitsu Kosan Co

Inventors

• Kunishi Noriyuki
• Sasaki Kenji
• Nagao Yukiko

Classifications

• B01D2239/0492

  on fibres · CPC title

• B65G53/60 Primary

  Devices for separating the materials from propellant gas · CPC title

• C08G64/186

  containing polysiloxane sequences · CPC title

• B01D46/023

  Pockets filters, i.e. multiple bag filters mounted on a common frame · CPC title

• B01D39/083

  of organic material · CPC title