Method for producing resin composition

Patent metadata

Field	Value
Publication number	US-2018201769-A1
Application number	US-201615743846-A
Country	US
Kind code	A1
Filing date	Jul 13, 2016
Priority date	Jul 16, 2015
Publication date	Jul 19, 2018
Grant date	—

Abstract

A method for producing a resin composition is provided. The method includes melting and kneading a thermoplastic resin having a transition temperature of less than 200° C. and a powder with a twin-screw kneading extruder. The powder is an inorganic filler having an apparent density of 0.1 to 1.5 g/ml. The resin is supplied from a supply port to the extruder, and the powder is supplied from a gravimetric feeder to the extruder through a screw type side feeder. A transport capacity of the side feeder is 2 times or more an effective volume of the powder per unit time. In the extruder, melting and kneading are performed under conditions in which resin pressure in a first kneading zone is 1 MPa or more, and resin pressure in a second kneading zone is less than 3 MPa, and gas is removed from a vent port.

First claim

1 . A method for producing a resin composition, comprising melting and kneading a thermoplastic resin having a transition temperature of less than 200° C. and a powder with a twin-screw kneading extruder, wherein
the powder is one or more powders selected from the group consisting of an inorganic filler having an apparent density of 0.1 to 1.5 g/ml and a thermoplastic resin powder having an apparent density of 0.1 to 1.0 g/ml and a transition temperature of 200° C. or more,
the twin-screw kneading extruder comprises a supply port, a first kneading zone, a screw type side feeder to which a gravimetric feeder is connected, a second kneading zone, and a vent port in order from an upstream side,
the thermoplastic resin having a transition temperature of less than 200° C. is supplied from the supply port to the twin-screw kneading extruder,
the powder is supplied from the gravimetric feeder to the twin-screw kneading extruder through the screw type side feeder,
a transport capacity of the screw type side feeder is 2 times or more an effective volume of the powder supplied from the gravimetric feeder to the screw type side feeder per unit time,
melting and kneading are performed under conditions in which resin pressure in the first kneading zone is 1 MPa or more, and resin pressure in the second kneading zone is less than 3 MPa, and
gas is removed from the vent port.

2 . The method for producing a resin composition according to claim 1 , wherein the resin pressure in the first kneading zone is 2 MPa or more.

3 . The method for producing a resin composition according to claim 1 , wherein the twin-screw kneading extruder has, further downstream of the vent port, a third kneading zone and a pressure reduction vent port downstream from the third kneading zone.

4 . The method for producing a resin composition according to claim 1 , wherein the powder and 25 parts by weight or more of resin pellets based on 100 parts by weight of the powder are supplied from the gravimetric feeder to the twin-screw kneading extruder through the screw type side feeder.

5 . The method for producing a resin composition according to claim 1 , wherein the powder is one or more powders selected from the group consisting of talc, kaolinite, and clay, and the thermoplastic resin having a transition temperature of less than 200° C. is a polyolefin-based resin.

Assignees

• Sumitomo Chemical Co

Inventors

• Sanada Takashi
• Shimano Mitsuyoshi
• Kameo Koji

Classifications

• B29B7/007

  for continuous mixing · CPC title

• B29B7/7495

  for mixing rubber · CPC title

• B29B7/90

  Fillers or reinforcements {, e.g. fibres} · CPC title

• B29K2509/00

  Use of inorganic materials not provided for in groups {B29K2503/00 - B29K2507/00,} as filler · CPC title

• C08L23/0815

  with aliphatic 1-olefins containing one carbon-to-carbon double bond · CPC title