US 8,137,812 B2Granted

Fluoropolymer and composition thereof

AssigneeDaikin Industries, Ltd.

InventorsTakahiro Kitahara, Tomohiro Kino, Megumi Sato, Eiji Fujita

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Abstract

The present invention provides a fluoropolymer capable of giving fluorine-containing molded materials and laminates excellent in moldability, productivity, interlaminar bonding and stress cracking resistance, in particular stress cracking resistance upon contacting with various liquid chemicals, without impairing such characteristics intrinsic in fluororesins as chemical resistance, solvent resistance, weathering resistance, antifouling properties, liquid chemical impermeability and nonstickiness. The present invention provides a fluoropolymer which is an oligomer-containing or oligomer-free fluoropolymer, wherein said oligomer has a molecular weight not higher than 10,000 and amounts to not more than 0.05% by mass relative to the fluoropolymer.

Claims2

Dependent claims

A method of producing a laminate containing a fluoropolymer comprising the step of removing oligomers by extruding the fluorine-containing ethylenic polymer obtained by polymerization using an extruder having a vent mechanism equipped with a pressure reducing device,

said fluoropolymer being an oligomer-containing or oligomer-free fluoropolymer, and
being a copolymer comprising tetrafluoroethylene unit and a perfluoro monomer unit derived from a perfluoro monomer represented by the general formula (i):
CF2═CF—Rf1 (i)
wherein Rf1 represents —CF3 or —ORf2, and Rf2 represents a perfluoroalkyl group containing 1 to 5 carbon atoms, and
wherein the content of oligomers having a number average molecular weight of not higher than 10,000 is not higher than 0.05% by mass relative to the mass of said fluoropolymer.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/176,225Filed 18 Jul 2008 · division
Priority: JP 2002-37509825 Dec 2002
Published: US 2008/0281065 A113 Nov 2008
Granted: 20 Mar 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 1/08
Layered products having a non-planar shape: tubular products
B32B 15/08
Comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 27/20
Characterised by the use of special additives: using fillers, pigments, thixotroping agents

Family

PCT/JP2003/016524Parent of this division · filed 24 Dec 2003
US 2008/0281065 A1Pre-grant publication · published 13 Nov 2008
Application10/540,549Parent of this division
US 2006/0088680 A1Published application
US 8,137,812 B2This patent

From the US filing history. Foreign family members aren’t listed.