Self-adhering polyorganosiloxane elastomer compositions and method for preparing same

摘要

Polyorganosiloxane compositions yielding cured elastomers exhibiting cohesive bonding to inorganic substrates contain as the adhesion promoter the combination of (1) a 1,2- bis(trialkoxysilyl)ethane of the general formula (RO)3SiCH2CH2Si(OR)3 where R represents an alkyl or haloalkyl radical containing from 1 to 8 carbon atoms, (2) an organosilicon compound containing at least one hydroxyl group or a hydrolyzable precursor thereof and at least one group that reacts at ambient temperature with the alkoxy groups of the silylethane or with the curable polyorganosiloxane composition, and (3) a catalyst for the reaction of the adhesion promoter ingredients. Preferred compositions are cured at room temperature by a platinum catalyzed hydrosilation reaction and are applied to metallic substrates that have not been cleaned or otherwise treated prior to application of the composition.