Single-component polyorganosiloxane compositon hardening...

C - Chemistry – Metallurgy – 08 – K

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C08K 5/544 (2006.01) C08K 5/5455 (2006.01) C08L 83/04 (2006.01)

Patent

CA 2388687

The invention concerns a single-constituent polyorganosiloxane composition, storage stable in the absence of humidity and hardening into adhesive non-yellowing elastomers in the presence of humidity, comprising: (1i) at least a linear crosslinkable polyorganosiloxane A; (2i) mineral fillers G; (3i) an efficient amount of a hardening catalyst H based on tin; (4i) and an adherence promoter P based on at least an organosilicon compound bearing both a hydrolysable group bound to the silicon atom and at least an organic group bound to the silicon atom, bearing an amine function and whereon the carbon in position .beta. of the amine is a sp3 hybridised and trisubstituted.

La présente invention a pour objet une composition monocomposante à base de polyorganosiloxane(s), stables au stockage en absence d'humidité et réticulant en élastomères non jaunissants et adhérents en présence d'humidité, comprenant: (1i) au moins un polyorganosiloxane linéaire réticulable A; (2i) des charges minérales G; (3i) une quantité efficace d'un catalyseur de durcissement H à base d'étain; (4i) et un agent promoteur d'adhérence P à base d'au moins un composé organosilicique portant à la fois au moins un groupe hydrolysable lié à l'atome de silicium et au moins un groupe organique lié à l'atome de silicium, porteur d'une fonction amine et sur lequel le carbone en position .beta. de l'amine est d'hybridation sp3 et trisubstitué.

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