Method for coating a flexible support with a silicone composition
AssigneeElkem Silicones France SAS
InventorsMichel Feder, Christian Maliverney
Life of this patent
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Abstract
The present invention concerns a method for coating a textile material with a silicone elastomer composition crosslinkable by condensation reactions, to produce a solid silicone elastomer, optionally in a thin layer, on a flexible support that can be made from a textile material, paper, polyvinyl chloride, polyester, polypropylene, polyamide, polyethylene, polyurethane, non-woven glass fiber fabric or polyethylene terephthalate.
Claims20
A process for coating a liquid silicone composition that is crosslinkable via condensation reaction to form a solid silicone elastomer on a flexible support, comprising a), b) and c) below:
- a) a liquid silicone composition that is crosslinkable via condensation reactions is prepared, comprising:
- at least one organosilicon compound comprising at least two identical or different hydrolyzable and condensable groups, or at least two silanol functions SiOH,
- at least one crosslinking agent,
- optionally at least one filler, and
- a catalytically effective amount of at least one catalyst which is a magnesium complex comprising in a structure thereof, two identical or different carboxylate ligands, wherein each carboxylate ligand comprises from 10 to 32 carbon atoms,
- b) on a flexible support, which may optionally be pre-covered on one or two faces with one or more layers of a polymer material, said silicone composition is deposited continuously or discontinuously onto one face of said flexible support or optionally onto the two faces of said flexible support, and
- c) said silicone composition is left to crosslink in the presence of humidity provided by ambient air or by exposure to water vapor, or by prior addition of water to said silicone composition so as to form a crosslinked solid silicone elastomer.
A transparent or translucent solid silicone elastomer obtained with a catalyst comprising a magnesium complex comprising in a structure thereof, two identical or different carboxylate ligands, wherein each carboxylate ligand comprises from 10 to 32 carbon atoms.
A one-pack RTV-1 composition which is in a single airtight pack and comprising a composition comprising
- a) a liquid silicone composition that is crosslinkable via condensation reactions is prepared, comprising:
- at least one organosilicon compound comprising at least two identical or different hydrolyzable and condensable groups, or at least two silanol functions SiOH,
- at least one crosslinking agent,
- optionally at least one filler, and
- a catalytically effective amount of at least one catalyst which is a magnesium complex comprising in a structure thereof, two identical or different carboxylate ligands, wherein each carboxylate ligand comprises from 10 to 32 carbon atoms.
A two-pack RTV-2 composition, which is a precursor of composition comprising
- a) a liquid silicone composition that is crosslinkable via condensation reactions is prepared, comprising:
- at least one organosilicon compound comprising at least two identical or different hydrolyzable and condensable groups, or at least two silanol functions ≡SiOH,
- at least one crosslinking agent,
- optionally at least one filler, and
- a catalytically effective amount of at least one catalyst which is a magnesium complex comprising in a structure thereof, two identical or different carboxylate ligands, wherein each carboxylate ligand comprises from 10 to 32 carbon atoms said two-pack RTV-2 composition being in two distinct packs P1 and P2, wherein:
- a) pack P1 is airtight and comprises:
- a catalytically effective amount of at least one catalyst (M) which is a magnesium complex comprising in its structure two identical or different carboxylate ligands, wherein each carboxylate ligand comprises from 10 to 32 carbon atoms, and
- at least one crosslinking agent (B), and
- b) pack P2 does not contain either said catalyst (M) or said crosslinking agent (B) and comprises:
- per 100 parts by weight of at least one organosilicon compound (A) comprising at least two identical or different hydrolyzable and condensable groups, or at least two silanol functions ≡SiOH, and
- from 0 to 10 parts by weight of water.
Dependencies are inferred from the claim text.