Fluorosilicone rubber composition

• US 9,777,157 B2
• Filed: 03/12/2015
• Issued: 10/03/2017
• Est. Priority Date: 03/12/2014
• Status: Active Grant

• Current Assignee: Shin-Etsu Chemical Company Limited
• Original Assignee: Shin-Etsu Chemical Company Limited
• Inventors: Hayashida, Osamu, Uno, Takao, Oishi, Kazuhiro, Kashima, Atsuhito
• Primary Examiner(s): Buie-Hatcher, Nicole M
• Application Number:
  US14/645,829
• Publication Number:
  US 20150259532A1
• Time in Patent Office: 936 Days
• CPC Class Codes: C08G 77/20 containing silicon bound to unsaturated aliphatic groups C08G77/045 takes precedence
• CPC Class Codes: C08G 77/24 halogen-containing groups
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C08L 83/00 Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 83/08 containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen

Abstract

A fluorosilicone rubber composition comprising (A) an alkenyl-rich fluorosilicone gum, (B) an alkenyl-poor fluorosilicone gum, (C) reinforcing silica, and (D) a curing catalyst cures into a product which experiences little change of physical strength even after immersion in alcohol-containing fuel oil.

Claims

1. A fluorosilicone rubber composition comprising:

(A) 10 to 90 parts by weight of a fluorosilicone gum of a formula (1);

2. The composition of claim 1 wherein the fluorosilicone gum (A) comprises 0.05 to 0.5 mol % of aliphatic unsaturated, monovalent hydrocarbon groups based on the total of silicon-bonded, substituted or unsubstituted, monovalent hydrocarbon groups.

3. A silicone rubber part which is formed by curing the fluorosilicone rubber composition of claim 1, wherein the part is suitable for use as a structural member in contact with an alcohol-containing fuel oil.

4. The composition of claim 1, wherein X in the formula (1) is a hydrogen atom.

5. The composition of claim 1, wherein X in the formula (1) is a silyl group of the formula (2):

6. The composition of claim 1, wherein X in the formula (1) is a silyl group of the formula (3):

7. The composition of claim 1, wherein X in the formula (4) is a hydrogen atom.

8. The composition of claim 1, wherein X in the formula (4) is a silyl group of the formula (2):

9. The composition of claim 1, wherein X in the formula (4) is a silyl group of the formula (3):

10. The composition of claim 1, wherein m is an integer of 0 to 12.

11. The composition of claim 1, wherein m is an integer of 3 to 8.

12. The composition of claim 1, wherein n is an integer of 2 to 50.

13. The composition of claim 1, wherein n is an integer of 3 to 20.

14. The composition of claim 1, wherein p is an integer of 500 to 10,000.

15. The composition of claim 1, wherein o is an integer of 1 to 20.

16. The composition of claim 1, wherein o is an integer of 3 to 10.

17. The composition of claim 1, wherein q is an integer of 500 to 10,000.

18. The composition of claim 1, wherein the organopolysiloxanes of formulae (1) and (4) are blended in a weight ratio in the range from 90/10 to 10/90.

19. The composition of claim 1, wherein the organopolysiloxanes of formulae (1) and (4) are blended in a weight ratio in the range from 80/20 to 20/80.

20. The composition of claim 1, wherein the organopolysiloxanes of formulae (1) and (4) are blended in a weight ratio in the range from 70/30 to 30/70.