Single-constituent polyorganosiloxane composition room...

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 13/02 (2006.01) C08K 3/26 (2006.01) C08K 5/3435 (2006.01) C08K 5/3492 (2006.01) C08K 5/544 (2006.01) C08L 83/04 (2006.01)

Patent

CA 2387590

The invention concerns a single-constituent and non-discolouring polyorganosiloxane composition, storage stable in the absence of humidity and curable in the presence of humidity into adhesive and non-yellowing elastomer, based on: (1i) 100 parts by weight of at least a curable linear polyorganosiloxane; (2i) 2 to 170 parts by weight of mineral fillers G; (3i) an efficient amount of a curing catalyst H; (4i) 0.2 to 6 parts by weight of an amine agent M consisting of at least a hindered cyclic amine; (5i) and 0.2 to 8 parts by weight of at least an adherence promoting agent P selected among organosilicon compounds bearing both (1) at least a hydrolysable group bound to the silicon atom and (2) at least an organic group comprising a linear or branched alkyl radical containing 1 to 8 carbon atoms whereof at least one of the carbons bears a primary or secondary amine group.

L'invention a pour objet une composition monocomposante et non jaunissante à base de polyorganosiloxane(s), stable au stockage en absence d'humidité et réticulant en présence d'humidité en élastomère non jaunissant et adhérent, à base de: (1i) 100 parties en poids d'au moins un polyorganopolysiloxane linéaire réticulable; (2i) 2 à 170 parties en poids de charges minérales G; (3i) une quantité efficace d'un catalyseur de durcissement H; (4i) 0,2 à 6 parties en poids d'un agent aminé M constitué d'au moins une amine cyclique encombrée; (5i) et 0,2 à 8 parties en poids d'au moins un agent promoteur d'adhérence P choisi parmi les composés organosiliciques portant à la fois (1) au moins un groupe hydrolysable lié à l'atome de silicium et (2) au moins un groupe organique comprenant un radical alkyle linéaire ou ramifié comprenant de 1 à 8 atomes de carbone dont au moins l'un des carbones porte un groupement amine primaire ou secondaire.

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