ELASTOMERIC COMPOSITIONS AND THEIR APPLICATIONS

摘要

There is provided a gel which is the condensation reaction product of the following composition: (i) at least one condensation curable silyl terminated polymer having at least one, typically at least 2 hydrolysable and/or hydroxyl functional groups per molecule; (ii) a cross-linker selected from the group of a silicone, an organic polymer, a silane or a disilane molecule which contains at least two hydrolysable groups per molecule and typically at least three hydrolysable groups per molecule and (iii) a condensation catalyst selected from the group of titanates, zirconates or tin (II) characterized in that the molar ratio of hydroxyl and/or hydrolysable groups in polymer (i) to hydrolysable groups from (ii) is between 0.5: 1 and 1:1 using a monosilane cross linker or 0.75:1 to 3: 1 using disilanes and the molar ratio of M-OR or tin II functions to the hydroxyl and/or hydrolysable groups in polymer (i) is comprised between 0.01:1 and 0.5:1, where M is titanium or zirconium. The composition, and uses for the gel are also described.