Process for improving adhesion of rubbery polymers by reacting with silanes in two stages
AssigneeToa Nenryo Kogyo Kabushiki Kaisha
InventorsYasukavu Shinada, Daniel E. Nerinckx
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Abstract
Rubbery polymer compositions, e.g. based on chlorobutyl rubber, having improved adhesion to mineral substrates such as glass or metal, are produced by a stepwise reaction sequence. In a first stage the rubbery polymer is reacted with a reactive silane such as an amino trialkoxy silane, in a second stage the product is mixed with an epoxy resin, and in a third stage a further amount of reactive silane is reacted with the epoxy containing compound.
Claims12
A process for producing a composition having improved adhesion to mineral substrates which comprises in a first stage reacting a rubbery polymer with a reactive silane at elevated temperature;
- in a second stage mixing the product of the first stage with an epoxy resin as wetting agent;
- and in a third stage reacting the epoxy containing product of the second stage with a further amount of a reactive silane to form the desired composition wherein said rubbery polymer is selected from the group consisting of halobutyl rubber, ethylene propylene rubber (EPR), ethylene propylene diene rubber (EPDM), and ethylene vinyl acetate copolymer (EVA), wherein said reactive silanes have a first group attached directly or indirectly to the silicon atom which is reactable with the rubbery polymer, and at least one other group attached directly or indirectly to the silicon atom which is hydrolysable, said reactive silanes in the first and third stages being the same or different.
A process for producing a composition having improved adhesion to mineral substrates which comprises in a first stage mixing a chlorobutyl rubber with an aminosilane having at least one hydrolyzable radical attached to the silicon atom;
- in a second stage mixing the product of the first stage with an epoxy resin;
- and in a third stage mixing the epoxy containing product of the second stage with a further amount of an aminosilane having at least one hydrolyzable radical attached to the silicon atom, to form the desired composition.
Dependencies are inferred from the claim text.