Fluororubber composition

Patent metadata

Field	Value
Publication number	US-9976016-B2
Application number	US-201314380101-A
Country	US
Kind code	B2
Filing date	Feb 22, 2013
Priority date	Feb 24, 2012
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

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 (δG′), represented by G′(1%)-G′(100%), is 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% under an uncrosslinked state and G′(100%) denotes a shear modulus at a dynamic strain of 100% under an uncrosslinked state, and G′(1%) and G′(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° C.

First claim

The invention claimed is:

1. A fluororubber composition, comprising:
a fluororubber (A1);
a fluororubber (A2); and
a carbon black (B),
wherein the fluororubber (A1) is a polymer having an iodine atom at both ends of its main chain;
the fluororubber (A2) is a polymer having an iodine atom at only one end of its main chain; and
a difference (δG′), represented by G′(1%)-G′(100%), is 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% under uncrosslinked state and G′(100%) denotes a shear modulus at a dynamic strain of 100% under an uncrosslinked state, and
G′(1%) and G′(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° C.,
wherein the weight ratio of the fluororubber (A1) to the fluororubber (A2) is 95/5 to 50/50 (w/w).

2. The fluororubber composition according to claim 1 ,
wherein the amount of the carbon black (B) is 5 to 65 parts by mass for 100 parts by mass of the total amount of the fluororubber (A1) and the fluororubber (A2).

3. The fluororubber composition according to claim 1 ,
wherein the carbon black (B) has a nitrogen adsorption specific surface area (N 2 SA) of 25 to 180 m 2 /g and a dibutyl phthalate (DBP) oil absorption number of 40 to 180 mL/100 g.

4. The fluororubber composition according to claim 1 , further comprising a crosslinking agent (C).

5. A crosslinked fluororubber article obtained by crosslinking the fluororubber composition according to claim 1 .

6. The crosslinked fluororubber article according to claim 5 ,
wherein the crosslinked fluororubber article is used for bladders for tire manufacturing.

7. A hose including a crosslinked fluororubber layer obtainable by crosslinking the fluororubber composition according to claim 1 .

8. A sealing material including a crosslinked fluororubber layer obtainable by crosslinking the fluororubber composition according to claim 1 .

9. A diaphragm including a crosslinked fluororubber layer obtainable by crosslinking the fluororubber composition according to claim 1 .

10. A belt and a belt material including a crosslinked fluororubber layer obtainable by crosslinking the fluororubber composition according to claim 1 .

11. A fluororubber composition, comprising:
a fluororubber (A1);
a fluororubber (A2); and
a carbon black (B),
wherein the fluororubber (A1) is a polymer having an iodine atom at both ends of its main chain; and
the fluororubber (A2) is a polymer having an iodine atom at only one end of its main chain,
wherein the weight ratio of the fluororubber (A1) to the fluororubber (A2) is 95/5 to 50/50 (w/w).

Assignees

• Daikin Ind Ltd

Inventors

• Ota Daisuke
• Morita Shigeru
• Ueda Akinori
• Kadowaki Yuu
• Kitaichi Masanori
• Doi Michiko
• Yamamura Kazuhiro
• Fukuoka Shoji
• Taeda Mayuko

Classifications

• C08L15/02 Primary

  Rubber derivatives containing halogen · CPC title

• C09K3/1009

  Fluorinated polymers, e.g. PTFE · CPC title

• F16L11/06

  with homogeneous wall (F16L11/11 takes precedence) · CPC title

• F16G5/04

  made of rubber (F16G5/02 takes precedence {consisting of several parts F16G5/16}) · CPC title

• F16G1/06

  made of rubber (F16G1/28 takes precedence {; consisting of several parts F16G1/22}; making thereof B29D29/00 ) · CPC title