Curing agents, curable compositions, compositions for...

C - Chemistry – Metallurgy – 08 – L

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C08L 101/00 (2006.01) C08G 77/38 (2006.01) C08G 77/50 (2006.01) C08L 83/05 (2006.01) G02B 1/04 (2006.01) H01L 33/00 (2006.01)

Patent

CA 2430866

The invention aims at a curing agent, curable compositions or compositions for optical materials, capable of providing for cured artifacts having laudable heat resistance, optical transparency, and light resistance; optical materials and methods for their production; and liquid crystal displays and LED's made by using the materials. A curing agent, which comprises at least two SiH groups which is obtainable by subjecting an aliphatic organic compound (.alpha.1) having at least two carbon-carbon double bonds capable of reacting with a SiH group, said aliphatic organic compound containing 1 to 6 vinyl groups and having a molecular weight of less than 900 and a viscosity of less than 1,000 poises and an acyclic and/or cyclic polyorganosiloxane (.beta.1) having at least two SiH groups to hydrosilylation reaction, or a curing agent, which comprises at least two SiH groups which is obtainable by subjecting an organic compound (.alpha.2) represented by the formula (I) Image (I), and a cyclic polyorganosiloxane (.beta.2) having at least two SiH groups to hydrosilylation reaction.

L'invention concerne des agents de durcissement, des compositions durcissables et des compositions pour matériaux optiques, capables de produire des articles durcis faisant preuve d'une excellente résistance thermique, d'une excellente transparence optique et d'une excellente résistance lumineuse. Les matériaux optiques et un procédé de production de ces matériaux font également l'objet de cette invention, de même que des afficheurs à cristaux liquides et les diodes électroluminescentes ainsi obtenues. Les agents de durcissement présentent chacun deux ou plusieurs groupes SiH, préparés soit par hydrosilylation ( alpha 1) d'un composé organique aliphatique ayant au moins deux doubles liaisons carbone-carbone réagissant au groupe SiH, entre 1 et 6 groupes vinyle, un poids moléculaire inférieur à 900 et une viscosité inférieure à 1000 P avec ( beta 1) un polyorganosiloxane linéaire et/ou cyclique ayant deux ou plusieurs groupes SiH, soit par hydrosilylation ( alpha 2) d'un composé organique représenté par la formule générale (I) avec ( beta 2) un polyorganosiloxane cyclique ayant deux ou plusieurs groupes SiH.

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