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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10676603 B1

PDFFull Text
Date of Patent:
Jun. 09, 2020

Filed:

Jul. 13, 2016

Method for producing resin composition

Applicant:

The Japan Steel Works, Ltd., Tokyo, JP;

Inventors:

Takashi Sanada, Ichihara, JP;

Mitsuyoshi Shimano, Ichihara, JP;

Koji Kameo, Ichihara, JP;

Assignee:

THE JAPAN STEEL WORKS, LTD., Tokyo, JP;

Attorney:

Panitch Schwarze Belisario & Nadel LLP

Primary Examiner:

Deve V Hall

Int. Cl.
CPC ...
C08L 23/12 (2006.01); B32B 7/00 (2019.01); C08L 23/08 (2006.01); C08L 23/20 (2006.01); B29B 7/84 (2006.01); B29B 7/90 (2006.01); B29B 7/74 (2006.01); B29B 7/60 (2006.01); B29B 7/00 (2006.01); B29B 7/48 (2006.01); B29B 7/46 (2006.01); B29K 23/00 (2006.01); B29K 509/00 (2006.01);
U.S. Cl.
CPC ...
C08L 23/12 (2013.01); B29B 7/007 (2013.01); B29B 7/484 (2013.01); B29B 7/60 (2013.01); B29B 7/7495 (2013.01); B29B 7/84 (2013.01); B29B 7/90 (2013.01); C08L 23/0815 (2013.01); C08L 23/20 (2013.01); B29B 7/46 (2013.01); B29K 2023/12 (2013.01); B29K 2509/00 (2013.01);
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.

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