Patent ID: 8501856
Filing Date: 2013-08-06
Classification: C08G,C08K,C08L

Abstract:
1. A moisture curable silicon-containing resin composition which is curable to form a translucent cured composition said moisture curable composition comprising: a) at least one silicon-containing resin selected from the group consisting of a diorganopolysiloxane wherein the silicon atom at each polymer chain end of said diorganopolysiloxane is silanol terminated and a silylated resin; b) at least one hydrophobic functionalized sol gel silica obtained by the process comprising: i) mixing an aqueous alcoholic solution and a functionalized silica-preparing catalyst with a first portion of a first organosilicon functionalizing agent to form a first reaction mixture; ii) reacting said first reaction mixture with a tetraalkoxysilane at a controlled rate to form a second reaction mixture comprising a sol gel silica, wherein the relative mole ratio of tetralkoxysilane to the first portion of first organosilicon functionalizing agent is from about 1:0.2 to about 1:0.6; and iii) further reacting said second reaction mixture with a mixture of a second portion of said first organosilicon functionalizing agent, wherein the relative mole ratio of the first portion of the first organosilicon functionalizing agent to the second portion of the first organosilicon functionalizing agent is from about 1:0.5 to about 1:1, and a second organosilicon functionalizing agent to functionalize the sol gel silica to form said functionalized sol gel silica, wherein the functionalized silica results in a lower viscosity of the combined silicon-containing resin and functionalized sol gel silica than the viscosity of a silicon-containing resin which is combined with a treated fumed silica; c) at least one condensation and/or crosslinking-facilitating catalyst; d) at least one crosslinker; and, optionally, e) at least one additional component selected from the group consisting of alkyl-terminated diorganopolysiloxane, filler, UV stabilizer, antioxidant, adhesion promoter, cure accelerator, thixotropic agent, plasticizer, polymer endcapping catalyst, moisture scavenger, pigment, dye, surfactant, solvent and biocide.