Mixing heat-curable alkenylsiloxanes

• Main Authors: BRIAN JOHN WARD, CHRIS ALLEN SUMPTER
• Format: Patent
• Language: English
• Published: 05.02.1997
• Edition: 6
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

Cold processable heat curable alkenyl silicone rubbers that comprising an alkenyl silicone gum or mixture of alkenyl silicone gums selected from the group of alkenyl silicone gums having the formula: (M a M vi 1-a )(D vi ) x (D) y (M a M vi 1-a ); where a is zero or one and x and y are zero or integers subject to the limitation that x must be greater than zero when a is one, where ```M = R 1 3 SiO 1/2 with R 1 selected from the group consisting of 1 to 8 carbon atom alkyl groups, phenyl and trifluoropropyl; ```M vi = R 2 (R 1 ) 2 SiO 1/2 with R 1 selected from the group consisting of 1 to 8 carbon atom alkyl groups, phenyl, and trifluoropropyl and R 2 selected from the group of 2 to 10 carbon atom linear or cyclic alkenyl groups; ```D vi = R 2 (R 1 )SiO 2/2 where R 1 and R 2 are as previously defined; ```D = (R 3 ) 2 SiO 2/2 where each R 3 is independently selected from the group consisting of 1 to 8 carbon atom alkyl groups, phenyl, and trifluoropropyl; and ```a process for making such heat curable rubbers, and articles of manufacture made therefrom. The alkenyl silicone and a vinyl-specific peroxide curing agent were mixed at a temperature below 100{C, preferably below 65{C.