Daikin Industries, Ltd.

Nissin Chemical Industry Co., Ltd.

Kazuhiro Yamamura

Masanori Kitaichi

Daisuke Ota

Shoji Fukuoka

Mayuko Taeda

Akinori Ueda

Michiko Doi

Yuu Kadowaki

Mitsuru Kishine

Tatsuya Morikawa

Manabu Fujisawa

Etsuo Minamino

Shigeru Morita

Masamichi Sukegawa

Yuji Gama

Katsuhide Ohtani

Takeshi Fukuzumi

Shoichi Arima

Provided is a fluororubber composition capable of providing a crosslinked fluororubber article that exhibits not only heat resistance, but also excellent mechanical properties at high temperatures. The fluororubber composition includes a fluororubber (A), a carbon black (B), and an aromatic petroleum resin (E), and the fluororubber composition has a difference δG′ (G′ (1%)−G′ (100%)) of not lower than 120 kPa and not higher than 3,000 kPa, where G′ (1%) denotes a shear modulus at a dynamic strain of 1%, G′ (100%) denotes a shear modulus at a dynamic strain of 100%, and G′ (1%) and G′ (100%) are determined by a dynamic viscoelasticity test carried out on an unvulcanised rubber with a rubber process analyzer (RPA) in a condition that the measurement frequency is 1 Hz and the measurement temperature is 100° C.

Fluororubber composition

A core-shell particle including a core containing a perfluoropolymer and a shell containing a non-fluorine resin, the core having a periphery coated with the non-fluorine resin at a coverage of 90% or more, the perfluoropolymer being a polymer containing a polymerized unit based on a perfluoro monomer in an amount of 90 mol % or more relative to all polymerized units, and the shell having a mass of 50 or less relative to a total mass of the core and the shell of 80. Also disclosed is a method for producing the core-shell particle.

Core-shell type particle, dispersion and powder

A fluororubber composition including a fluororubber having an iodine content of 10 to 90 mol % for the total mole of the polymer end groups and a carbon black (B), wherein a difference (&#x3b4;G'), represented by G&#x2032;(1%)-G&#x2032;(100%), is not lower than 120 kPa and not higher than 3,000 kPa, where G&#x2032;(1%) denotes a shear modulus at a dynamic strain of 1% under an uncrosslinked state and G&#x2032;(100%) denotes a shear modulus at a dynamic strain of 100% under an uncrosslinked state, and G&#x2032;(1%) and G&#x2032;(100%) are determined by a dynamic viscoelasticity test with a rubber process analyzer (RPA) in a condition that the measurement frequency is 1 Hz and the measurement temperature is 100&#xb0; C.

A fluororubber composition which includes a fluororubber (A) and a carbon black (B). The fluororubber (A) is a vinylidene fluoride-based fluororubber including a structural unit (VdF unit) derived from vinylidene fluoride and a structural unit derived from at least one monomer selected from the group consisting of hexafluoropropylene (HFP), 2,3,3,3-tetrafluoro propylene, and perfluoro(alkyl vinyl ether) (PAVE). The molar ratio of the VdF unit to the structural unit derived from at least one monomer selected from the group consisting of HFP, 2,3,3,3-tetrafluoro propylene, and PAVE is 50/50 to 78/22. The fluororubber composition has a difference &#x3b4;G' (G&#x2032; (1%)-G&#x2032; (100%)) of not lower than 120 kPa and not higher than 3,000 kPa, where G&#x2032; (1%) denotes a modulus of shearing elasticity at a dynamic strain of 1%, G&#x2032; (100%) denotes a modulus of shearing elasticity at a dynamic strain of 100%, and G&#x2032; (1%) and G&#x2032; (100%) are determined by a dynamic viscoelasticity test.

The invention provides a fluororubber composition able to produce a crosslinked fluororubber article that exhibits not only heat resistance, but also excellent mechanical properties at high temperatures, and a method for producing same. The fluororubber composition contains: a fluororubber (A); and carbon black (B), wherein when the aforementioned fluororubber composition is immersed for 160 hours in an extraction solvent of acetone and hexane at an acetone:hexane mass ratio of 42.29:57.71 at 40&#xb0; C. and an extraction residue that is not extracted and remains as a solid is separated from the aforementioned extraction solvent and dried and then the dry weight of the extraction residue is measured, the quantity of a solvent-insoluble polymer is not lower than 5%.

Fluororubber composition and method for producing same

The present invention has for its object to provide a fluorocopolymer which is available at low cost, has fluidity at room temperature, and is curable, a method of producing the same copolymer and a curable composition having good processability and in situ moldability. The present invention is directed to a fluorocopolymer which is fluid at room temperature and curable, and which is obtainable from a trifluorovinyl group-containing monomer with an ethylenically unsaturated double bond moiety being a trifluorovinyl group.

Fluorocopolymer, process for producing fluorocopolymer, fluorocopolymer curable composition, and cured object

Growing community of inventors

Settsu, Japan

Kazuhiro Yamamura