| 摘要 |
A one or two part moisture curable composition capable of curing to an elastomeric body, the composition comprising an organopolysiloxane containing polymer having not less than two silicon-bonded condensable (preferably hydroxyl or hydrolysable) groups and/or a polymer with an organic polymeric based chain which has been end-capped with silicon containing groups comprising condensable (preferably hydroxyl or hydrolysable) substituents; a siloxane and/or silane cross-linker having at least two groups per molecule which are reactable with the condensable groups in the polymer; at least one compatible mineral oil based extender (i.e. process aid or secondary plasticizer); a suitable cure catalyst and optionally one or more fillers. These compositions overcome the problem of lack of compatibility of the extender compounds with components in the uncured silicone composition, such as phase separation during storage, and also avoid exudation of extender from the cured composition. Preferred extenders are paraffinic hydrocarbons with high initial boiling points (greater than 230 {C) and high molecular weight (greater than 150 preferably greater than 200). The composition is useful as a sealant. |
