Molded structures of polycarbonate based substrates over molded with silicone rubbers
Articles comprising: a molded substrate comprising one or more polycarbonate resins or blends of polycarbonate and polyester resins containing polydimethyl siloxanes modified with one or more of acrylate, hydroxyl or epoxy groups and disposed on the surface or a portion of the surface of the substrate is a cured silicone rubber; wherein the one or more polycarbonate resins or blends of polycarbonate and polyester resins contain the modified polydimethyl siloxanes in sufficient amount such that the peel strength is increased. Compositions comprising one or more polycarbonate resins or blends of polycarbonate and polyester resins containing polydimethyl siloxanes modified with one or more of acrylate, hydroxyl or epoxy groups in an amount of about 0.1 to less than 1.0 percent by weight. Methods for preparing the articles are disclosed.
1. An article comprising: a molded substrate comprised of a composition comprising one or more polycarbonate resins or blends of polycarbonate and polyester resins; polydimethyl siloxanes modified with one or more of acrylate or hydroxyl groups in an amount of about 0.1 to less than 1.0 percent by weight; one or more reinforcing fibers present in an amount of about 0.5 to about 60 percent by weight; and one or more core shell rubbers present in an amount of about 0.5 to about 25 percent by weight; wherein the amounts are based on the weight of the composition, and wherein the polydimethyl siloxanes modified with one or more of acrylate or hydroxyl groups is disposed on a carrier, and a cured silicone rubber disposed on the surface or a portion of the surface of the molded substrate; wherein the one or more polycarbonate resins or blends of polycarbonate and polyester resins contain the polydimethyl siloxanes in sufficient amount such that the peel strength is increased.
2. The article according to claim 1 , wherein the one of more polycarbonates blends of polycarbonate and polyester resins exhibit a composite melt flow rate of about 3 to 20.
3. The article according to claim 1 , wherein the polydimethyl siloxanes are modified with the acrylate groups.
4. The article according to claim 1 , wherein the one or more polycarbonate resins or blends of polycarbonate and polyester resins contain one or more pigments.
5. The article according to claim 1 , wherein the one or more polycarbonate resins or blends of polycarbonate and polyester resins contain one or more internal mold release compounds.
6. The article according to claim 1 , wherein the cured silicone rubber comprises the reaction product of an alkenyl group-containing organopolysiloxane and an organohydrogenpolysiloxane having at least two hydrogen atoms each directly attached to a silicon atom in a molecule.
7. A composition comprising one or more polycarbonate resins or blends of polycarbonate and polyester resins; polydimethyl siloxanes modified with one or more of acrylate or hydroxyl groups in an amount of about 0.1 to less than 1.0 percent by weight; one or more reinforcing fibers present in an amount of about 0.5 to about 60 percent by weight; and one or more core shell rubbers present in an amount of about 0.5 to about 25 percent by weight; wherein the amounts are based on the weight of the composition, and
wherein the polydimethyl siloxanes modified with one or more of acrylate or hydroxyl groups is disposed on a carrier.
8. The composition according to claim 7 , wherein the one or more polycarbonate resins or blends of polycarbonate and polyester resins contain one or more pigments.
9. The composition according to claim 8 , wherein the one or more pigments is zinc sulfide or titanium dioxide.
10. The composition according to claim 7 , wherein the one or more polycarbonate resins or blends of polycarbonate and polyester resins contain one or more internal mold release compounds in an amount of about 0.0001 to about 2 percent by weight.
11. The composition according to claim 7 , wherein the carrier comprises fumed silica.
12. The composition according to claim 7 , wherein the one or more core shell rubbers comprise a core and a shell, and wherein the core comprises polysiloxane chains.
13. The composition according to claim 7 , wherein the one or more core shell rubbers comprise a core and a shell, and wherein the shell comprises a polymer with reactive groups including glycidyl or maleic anhydride.
14. The composition according to claim 7 , wherein the one or more core shell rubbers comprise a core and a shell, wherein the core comprises polydimethyl siloxane and acrylate, and wherein the shell comprises methylmethacrylate.
15. A method comprising:
a) molding a substrate from a composition comprising one or more polycarbonate resins or blends of polycarbonate and polyester resins; polydimethyl siloxanes modified with one or more of acrylate or hydroxyl groups in an amount of about 0.1 to less than 1.0 percent by weight; one or more reinforcing fibers present in an amount of about 0.5 to about 60 percent by weight; and one or more core shell rubbers present in an amount of about 0.5 to about 25 percent by weight; wherein the amounts are based on the weight of the composition, and wherein the polydimethyl siloxanes modified with one or more of acrylate or hydroxyl groups is disposed on a carrier;
b) applying a mixture comprising one or more polysiloxanes containing one or more unsaturated groups, one of more polysiloxanes containing one or more S—H groups; and one or more platinum based catalysts to the surface or a portion of the surface of the substrate; and
c) exposing the mixture of one or more polysiloxanes containing one or more unsaturated groups, one of more polysiloxanes containing one or more S—H groups; and one or more platinum based catalysts to conditions such that a cured silicone rubber layer is disposed on the surface or a portion of the surface of the substrate.