Condensation crosslinking silicone foams
AssigneeSonderhoff Chemicals GmbH
InventorsStephan Morhenn, Alfred Link
Life of this patent
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Abstract
A process for producing silicone foam, involves a reaction mixture in which hydrogen is released in a first reaction of compounds with at least one Si—H group in the presence of a basic catalyst. The reaction mixture is crosslinked in a second reaction in the presence of a metal catalyst.
Claims33
A process for producing silicone foam, by using a reaction mixture in which hydrogen is released in a first reaction of compounds with at least one Si—H group in the presence of a basic catalyst, and the reaction mixture is crosslinked in a second reaction in the presence of a metal catalyst.
The process of claim, 1 wherein the second reaction proceeds with a time delay after the first reaction.
The process of claim, 1 wherein the second reaction is effected between a polysiloxane a) with at least two Si—OH groups and a compound b) with at least two Si—O—C groups.
A reaction mixture for preparing silicone foam, comprising
- a) a polysiloxane with at least two Si—OH groups,
- b) a compound with at least two Si—O—C groups,
- c) a metal catalyst selected from the group consisting of metals, metal compounds and organometallic compounds,
- d) a compound with at least one Si—H group,
- e) a basic catalyst either identical to the compounds b) or a separate catalyst.
A two-component system for producing silicone foam, comprising a component A, wherein component A comprises:
- a) a polysiloxane with at least two Si—OH groups,
- d) a compound with at least one Si—H group,
- and a component B comprising
- b) a compound with at least two Si—O—C groups,
- c) a metal catalyst selected from the group consisting of metals and organometallic compounds.
Dependencies are inferred from the claim text.