Acrylic rubber composition and cross-linked product thereof

• US 8,658,737 B2
• Filed: 08/18/2010
• Issued: 02/25/2014
• Est. Priority Date: 08/20/2009
• Status: Active Grant

• Current Assignee: Denki Kagaku Kogyo Kabushiki Kaisha (TDK Corporation)
• Original Assignee: Denki Kagaku Kogyo Kabushiki Kaisha (TDK Corporation)
• Inventors: Yamagishi, Uichiro, Abe, Yasushi, Miyauchi, Toshiaki
• Primary Examiner(s): ZIMMER, MARC S
• Application Number:
  US13/390,637
• Publication Number:
  US 20120141711A1
• Time in Patent Office: 1,287 Days
• Field of Search: None
• US Class Current: 525/100
• CPC Class Codes: C08L 33/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08L 83/08 containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
• CPC Class Codes: Y10T 428/139 Open-ended, self-supporting conduit, cylinder, or tube-type article

Abstract

Provided is an acrylic rubber composition including an acrylic rubber and a functionalized silicone oil. Here, the functionalized silicone oil preferably has a particular polydimethylsiloxane structure having at least one binding site bonded with at least one of a monoamino group, a diamino group, a polyether group, an epoxy group, an alicyclic epoxy group, a hydroxyl group, a thiol group, a carboxyl group, a hydrogen group (Si—H group), a methacryl group, a phenol group, an alkoxy group, an ester group, an amide group, an alkyl group, a fluoroalkyl group, and a diol group and has a functional group equivalent weight of 1 to 100,000 (g/mol). The composition is unlikely to be deteriorated even when it is exposed to high temperature for a long time and that has excellent heat resistance and a crosslinked product of the composition. The composition is unlikely to be deteriorated even when it is exposed to high temperature for a long time and that has excellent heat resistance and a crosslinked product of the composition.

Claims

1. An acrylic rubber composition comprising:

an acrylic rubber;

a functionalized silicone oil; and

an aromatic polyamine, wherein;

the acrylic rubber is at least one compound selected from a carboxyl group-containing acrylic rubber, an epoxy group-containing acrylic rubber, and an active chlorine group containing acrylic rubber,

the silicone oil is included in an amount of 0.3 to 30 parts by mass based on 100 parts by mass of the acrylic rubber and has a polydimethylsiloxane structure represented by Formula 1 and having at least one of binding sites α

, β

, and γ

bonded with a functional group and has a functional group equivalent of 1 to 100,000 (g/mol);

2. The acrylic rubber composition according to claim 1, further comprising an aliphatic polyamine.

3. The acrylic rubber composition according to claim 2, wherein:

the aromatic polyamine is a compound represented by the formula below;

H₂N-Ph-M-Ph-NH₂,

M represents one of O, S, SO₂, CONH, and O—

R—

O,

R in O—

R—

O represents one of Ph, Ph-Ph, Ph-SO₂-Ph, (CH₂)m, Ph-CH₂—

C(CX₃)₂—

CH₂-Ph, (CH₂)C(CH₃)₂(CH₂), and PhC(CH₃)₂-Ph,

Ph represents a benzene ring,

m is 3 to 5,

X is H or F, and

Ph is a benzene ring.

4. A cross-linked product composition obtained by vulcanization of the acrylic rubber composition according to claim 1.

5. A rubber hose comprising the cross-linked product composition according to claim 4.

6. A seal comprising the cross-linked product composition according to claim 4.

7. A rubber vibration isolator for an automobile comprising the cross-linked product composition according to claim 4.

8. A rubber tube comprising the cross-linked product composition according to claim 4.

9. An industrial belt comprising the cross-linked product composition according to claim 4.

10. An industrial rubber vibration isolator comprising the cross-linked product composition according to claim 4.

11. A wire covering rubber comprising the cross-linked product composition according to claim 4.

12. A boot material for an automobile comprising the cross-linked product composition according to claim 4.

13. The acrylic rubber composition according to claim 3 where the aromatic polyamine is 2,2-bis[4-(4-aminophenoxy)phenyl]propane.