Organofunctional siloxanes, process for preparing same and their use for the treatment of fillings and surfaces
The present invention provides organofunctional siloxane coupling agents, dipodal siloxanes, siloxane block copolymers and a specific method for preparing these organofunctional siloxanes through an addition reaction of hydrido alkoxysilane and organofunctional disiloxanes to an organocyclosiloxane with a catalyst. The addition reaction of the current invention does not result in polymerization and therefore the novel siloxane couplings agents are free of cyclosiloxanes and polymeric siloxanes. This makes them apt for adhesives, coatings and sealant applications. The present invention also relates to the use of these organofunctional siloxane compounds for the treatment of fillers and surfaces.
1. A method for the treatment of fillers comprising:
1) applying a silane coupling agent and drying at room temperature;
2) applying a functionalized hydrophilic fumed silica with a specific surface area of 200 m 2 /g and drying at room temperature;
3) applying an organofunctional siloxane selected from the group consisting of:
an organofunctional siloxane having the formula (V)
XR 1 SiR 2 (OSiR 2 ) n+1 OSiR 3 (V)
wherein
X is selected from the group consisting of hydrogen, hydroxyl, aldehyde, acetate, amino, alkylimine, alkylamino, dialkylamino, diaminoalkyl, ureido, isocyanate, anhydride, epoxycyclohexyl, glycidoxy, mercapto, acryloxy, methacryloxy, methacrylamide, acrylamide, alkylamide, carboxylic acid, alkenyl, 2-hydroxy-3-(methacryloyloxy)propan-l-olate, alkyl, cycloalkyl, aryl, alkylaryl, arylalkyl, aryloxy, perfluoroalkyl, perfluoroaryl, alkylpolyalkylenoxy and hydroxypolyalkylenoxy;
R is selected from the group consisting of halogen, hydrogen, hydroxyl, alkyl, alkenyl, alkynyl, cycloalkyl, aryl, arylalkyl, alkylaryl and dialklyaryl, and alkoxy, acyloxy, alkyloyl, carbinoyl acyloxy group, alkylamine, dialkylamine, oximino and enoxy;
R 1 is selected from the group consisting of methyl, ethyl, propyl, butyl, isobutyl, phenyl and phenethyl; and
n is an integer having a value of 2 to 100,
an organofunctional siloxane having the formula (VII)
R 3 SiO(R 2 SiO) n SiR 2 R 2 SiR 2 (OSiR 2 ) n OSiR 3 (VII)
wherein
R is selected from the group consisting of hydrogen, hydroxyl, alkyl, alkenyl, alkynyl, cycloalkyl, aryl, arylalkyl, alkylaryl, dialklyaryl, alkoxy, acyloxy, alkyloyl, carbinoyl acyloxy group, alkylamine, dialkylamine, oximino and enoxy;
R 2 is selected from the group consisting of methyl, ethyl, propyl, butyl, isobutyl, phenyl and phenethyl; and
n is an integer having a value of 2 to 100, and
an organofunctional siloxane having the formula (VIII)
R 3 SiO(R 2 SiO) n (SiR 2 )R 1 S y R 1 (SiR 2 )(OSiR 2 ) n OSiR 3 (VIII)
wherein
R is selected from the group consisting of hydrogen, hydroxyl, alkyl, alkenyl, alkynyl, cycloalkyl, aryl, arylalkyl, alkylaryl, dialklyaryl, alkoxy, acyloxy, alkyloyl, carbinoyl acyloxy group, alkylamine, dialkylamine, oximino and enoxy;
R 1 is selected from the group consisting of alkyl, cycloalkyl, aryl, arylalkyl, alkylaryl and dialklyaryl;
n is an integer having a value of 2 to 100; and
y is an integer having a value of 1 to 100,
wherein the fillers are quartz, silica, glass, aluminium, clays, silicon, copper, tin, talc, inorganic oxides, steel, asbestos, nickel, zinc, lead, marble, gypsum, graphite or carbon.