US 2026/0109818 A1 · LIQUID SILICONE RUBBER COMPOSITION

Abstract

This disclosure relates to hydrosilylation (addition) curable silicone rubber compositions, to silicone elastomeric materials with an improved high temperature (e.g., 175° C.) compression set in accordance with ISO 815-1 method A which are produced by curing the silicone rubber compositions, and to a method for preparing the silicone elastomeric materials. This disclosure also relates to uses for such materials. A silicone rubber composition comprises: (a) one or more polyorganosiloxanes having at least two unsaturated groups and a viscosity of from 1,000 to 100,000 mPa·s at 25° C.; (b) an organosilicon compound having Si—H groups; (c) a silica reinforcing filler; (d) a hydrosilylation catalyst; (e) a compression set additive selected from: (i) a phthalocyanine compound or a metal derivative of such a compound, and optionally (ii) one or more compounds selected from a diacylhydrazide-based compound; and (f) one or more of magnesium hydroxide, a magnesium carbonate, a magnesium hydroxy carbonate, or manganese carbonate.

Claims15

Dependent claims

A silicone rubber composition, which comprises the following components:

(a) one or more polyorganosiloxanes containing at least two unsaturated groups, selected from alkenyl groups and alkynyl groups, per molecule and having a viscosity in a range of from 1,000 to 100,000 mPa·s at 25° C.;
(b) an organosilicon compound having at least two, optionally at least three, Si—H groups per molecule;
(c) a silica reinforcing filler which is optionally hydrophobically treated;
(d) a hydrosilylation catalyst comprising or consisting of a platinum group metal or a compound thereof;
(e) a compression set additive present in an amount of from 0.02 to 3.5 wt. % of the composition and selected from:
(i) a phthalocyanine compound or a metal derivative of such a compound, where the metal is selected from copper, nickel, cobalt, iron, manganese, chromium, zinc, platinum, palladium, and vanadium;
and optionally
(ii) one or more compounds selected from a diacylhydrazide-based compound;
and
(f) one or more of magnesium hydroxide, a magnesium carbonate, a magnesium hydroxy carbonate, or manganese carbonate in an amount of from 0.25 to 5.0 wt. % of the composition;
wherein the total wt. % of the composition is 100 wt. %.

8 more elements

Dependencies are inferred from the claim text.

Liquid silicone rubber composition

Life of this patent

Liquid silicone rubber composition

Life of this patent

Abstract

Claims15