Silicone gel composition excellent in damping property

• US 5,332,795 A
• Filed: 09/14/1992
• Issued: 07/26/1994
• Est. Priority Date: 09/13/1991
• Status: Expired due to Term

• Current Assignee: Shin-Etsu Chemical Company Limited
• Original Assignee: Shin-Etsu Chemical Company Limited
• Inventors: Fujiki, Hironao, Hara, Hiroyasu
• Primary Examiner(s): Bleutge, John C.
• Assistant Examiner(s): MOORE, MARGARET G
• Application Number:
  US07/944,275
• Time in Patent Office: 680 Days
• Field of Search: 528/42, 528/43, 528/15, 528/31, 528/32, 525/478
• US Class Current: 528/15
• CPC Class Codes: C08G 77/12 containing silicon bound to hydrogen C08G77/045 takes precedence
• 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: C08G 77/70 Siloxanes defined by use of the MDTQ nomenclature
• 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 83/04 Polysiloxanes
• CPC Class Codes: C08L 83/08 containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen

Abstract

A silicone gel composition, comprising as essential components

(A) an organopolysiloxane comprising substantially 90 to 97 mol % of R(CH₃)SiO units, 0.1 to 2.5 mol % of RSiO₁.5 units, and 0.1 to 4.0 mol % of CH₃ R(CH₂ ═CH)Si₀.5 units, wherein R represents a group selected from the group consisting of a methyl group, a phenyl group, and a CF₃ CH₂ CH₂ -- group, provided that the total of the phenyl groups and the CF₃ CH₂ CH₂ -- groups out of the R groups amounts to 0.5 to 10 mol % in all the R groups,

(B) a hydrogenpolysiloxane containing at least one silicon-bonded hydrogen atom per molecule in such an amount that the number of the silicon-bonded hydrogen atoms is 0.5 to 1.5 per vinyl group bonded to silicon atoms in the component (A), and

(C) a platinum catalyst. From this composition, a silicone gel excellent damping properties, rapid curability, and low-temperature properties can be obtained.

Claims

1. A silicone gel composition which will be cured to form a gel, comprising as essential components:

(A) 92 to 97 mol % of (CH₃)₂ SiO units, 3.0 to 5.0 mol % of (C₆ H₅) (CH₃) SiO units, 0.1 to 1.0 mol % of (CH₃) SiO₁.5 units, 0.1 to 1.5 mol % of (CH₃)₂ (CH₂ ═

CH)SiO₀.5 units, and 0.5 to 4.0 mol % of (CH₃)₃ SiO₀.5 units,

(B) a hydrogenpolysiloxane containing at least one silicon-bonded hydrogen atom per molecule in such an amount that the number of the silicon-bonded hydrogen atoms is 0.5 to 1.5 per vinyl group bonded to silicon atoms in the component (A), and

(C) a platinum catalyst.

2. A composition as claimed in claim 1, wherein 0.3 to 1.0 mol % of CH₃ SiO₁.5 units are present in component (A).

3. A composition as claimed in claim 1, wherein the component (B), the hydrogenpolysiloxane, comprises at least one selected from the group consisting of ##STR5## wherein Me stands for a methyl group and n and m are each a positive integer.

4. A silicone gel obtained by curing a composition as claimed in claim 1.