Use of compositions which can be crosslinked to give degradation-stable silicone rubbers as sealing compositions in fuel cells
First Claim
1. A process for sealing two or more fuel cell components in a fuel cell or fuel cell stack, said process comprising applying a curable elastomeric sealing composition onto at least one component to be sealed or between two components to be sealed, said curable elastomeric sealing composition comprising component (A) comprising at least one polyorganosiloxane (I) bearing on average at least two alkenyl groups per molecule;
- component (B) comprising at least one polyorganosiloxane (II) bearing on average at least two Si-bonded hydrogen atoms per molecule;
an effective amount of hydrosilylation catalyst (IV); and
an additive (III) comprising an organic sulfur compound, an organosilicon sulfur compound, or mixture thereof.
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Abstract
The invention describes the use of compositions, which can be crosslinked to give elastomers, based on
component (A) comprising polyorganosiloxane (I) having at least two alkenyl groups per molecule and catalyst (IV); and
component (B) comprising polyorganosiloxane (II) having at least two Si-bonded hydrogen atoms per molecule and additive (III) chosen from the group consisting of organic or organosilicon sulfur compounds, as sealing composition in fuel cells or fuel cell stacks.
20 Citations
20 Claims
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1. A process for sealing two or more fuel cell components in a fuel cell or fuel cell stack, said process comprising applying a curable elastomeric sealing composition onto at least one component to be sealed or between two components to be sealed, said curable elastomeric sealing composition comprising
component (A) comprising at least one polyorganosiloxane (I) bearing on average at least two alkenyl groups per molecule; -
component (B) comprising at least one polyorganosiloxane (II) bearing on average at least two Si-bonded hydrogen atoms per molecule;
an effective amount of hydrosilylation catalyst (IV); and
an additive (III) comprising an organic sulfur compound, an organosilicon sulfur compound, or mixture thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 17)
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11. A seal in a fuel cell or a fuel cell stack, said seal comprising a cured sealing composition comprising prior to cure,
component (A) comprising at least one polyorganosiloxane (I) bearing on average at least two alkenyl groups per molecule; -
component (B) comprising at least one polyorganosiloxane (II) bearing on average at least two Si-bonded hydrogen atoms per molecule;
an effective amount of hydrosilylation catalyst (IV); and
an additive (III) comprising an organic sulfur compound, an organosilicon sulfur compound, or mixture thereof. - View Dependent Claims (12, 13, 14, 15, 16, 18, 19, 20)
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Specification