Antistatic silicone rubber composition

Patent metadata

Field	Value
Publication number	US-12134707-B2
Application number	US-202017422828-A
Country	US
Kind code	B2
Filing date	Jan 10, 2020
Priority date	Jan 17, 2019
Publication date	Nov 5, 2024
Grant date	Nov 5, 2024

Abstract

Provided is an antistatic silicone rubber composition. The composition comprises at least one potassium salt selected from the group consisting of a potassium alkyl phosphate, potassium bis(trialkylsily)amide, potassium dialkyl amide, potassium sulfate, potassium phenoxide, and potassium permanganate, in an amount of from about 0.1 to about 15 mass % of the composition. In general, the composition may comprise: (A) an organopolysiloxane having at least two silicon atom-bonded alkenyl groups per molecule; (B) an organopolysiloxane having at least two silicon atom-bonded hydrogen atoms per molecule; (C) a hydrosilylation catalyst; and (D) the at least one potassium salt as described above. The composition generally exhibits good curability, and cures to form a silicone rubber exhibiting excellent antistatic properties.

First claim

The invention claimed is:

1. An antistatic silicone rubber composition comprising
(A) an organopolysiloxane having at least two silicon atom-bonded alkenyl groups per molecule;
(B) an organopolysiloxane having at least two silicon atom-bonded hydrogen atoms per molecule in an amount such that a content of silicon atom-bonded hydrogen atoms in this component is from about 0.1 to about 10 moles per 1 mole of silicon atom-bonded alkenyl groups in component (A);
(C) a hydrosilylation catalyst in a sufficient amount to cure the composition;
(D) at least one potassium salt selected from the group consisting of a potassium alkyl phosphate, potassium bis(trialkylsilyl)amide, potassium dialkyl amide, potassium phenoxide, and potassium permanganate, in an amount of from 0.1 to about 15 mass % of the composition; and
(E) a hydrolyzation reaction inhibitor in an amount of from about 0.001 to about 1 mass % of the composition.

2. The antistatic silicone rubber composition according to claim 1 , wherein the potassium alkyl phosphate is at least one component selected from the group consisting of a potassium monoalkyl phosphate represented by the general formula:

a potassium dialkyl phosphate represented by the general formula:

and a potassium dialkyl pyrophosphate represented by the general formula:

wherein R 1 are the same or different alkyl groups having 1 to 12 carbon atoms, X are the same or different potassium atoms or hydrogen atoms, and provided the at least one X is a potassium atom.

3. The antistatic silicone rubber composition according to claim 1 , wherein the antistatic silicone rubber composition is cured by a hydrosilylation reaction.

4. The antistatic silicone rubber composition according to claim 1 wherein the antistatic silicone rubber composition is useful for a rubber mold-making material.

5. An antistatic silicone rubber obtained by curing the antistatic silicone rubber composition according to claim 1 .

6. The antistatic silicone rubber according to claim 5 , wherein the antistatic silicone rubber has a surface resistivity of from about 10 10 to about 10 12 Ω/square.

Assignees

• Dow Silicones Corp

Inventors

• Lee Gyuyoung

Classifications

• C08L2312/08

  by silane · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L83/04

  Polysiloxanes · CPC title

• C08K2201/017

  Additives being an antistatic agent · CPC title

• C08K5/521 Primary

  Esters of phosphoric acids, e.g. of H3PO4 · CPC title