Method of adhesion improvement for silicone compositions

• Main Author: LOWER, LOREN DALE
• Format: Patent
• Language: English; French; German
• Published: 22.10.1997
• Edition: 6
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DYES; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; USE OF MATERIALS AS ADHESIVES

A method is disclosed for adhesion improvement of a room temperature vulcanizable (RTV) silicone composition to substrates. This is accomplished by adding a monoketoester, such as ethylacetoacetate, to an RTV silicone composition which is comprised of an alkoxy ended polydiorganosiloxane, a crosslinker having silicon-bonded methoxy or ethoxy group, a filler and a titanate catalyst. Then by applying this composition to a substrate to form intimate contact between the substrate and uncured composition. Thereafter, the composition is exposed to atmospheric moisture for a sufficient time to obtain a cured material. When tested, the bond between the cured material and the substrate surprisingly exhibits cohesive failure.