Core-shell particle, method, and composition
AssigneeSabic Innovative Plastics IP B.V.
InventorsAmol Adhikrao Mohite, Jaykisor Pal, Sathya Narayanan, Satishkumar H. Mahanth, Albin Peter Berzinis, Shripathy Vilasagar
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Abstract
A core-shell particle is formed by a method that includes forming a crosslinked polyorganosiloxane core, reacting a graftlinking agent with the crosslinked polyorganosiloxane core, and polymerizing a poly(alkenyl aromatic) shell around the graftlinking agent-functionalized polyorganosiloxane core. The method produces a core-shell particle with improved adhesion between shell and core. The core-shell particle is useful as an impact modifier in thermoplastic compositions.
Claims39
A method of forming a core-shell particle, comprising:
- forming a polyorganosiloxane core by polymerizing a polydialkylsiloxane precursor in the presence of water and a first emulsifying agent;
- crosslinking the polyorganosiloxane core by reacting a tri- or tetraalkoxysilane with the polyorganosiloxane core;
- forming a graftlinker-functionalized crosslinked polyorganosiloxane core by reacting the crosslinked polyorganosiloxane core with a graftlinking agent comprising an alkoxysilane group and an aliphatic carbon-carbon double or triple bond;
- and
- forming a core-shell particle by polymerizing a shell-forming monomer in the presence of the graftlinker-functionalized crosslinked polysiloxane core and a second emulsifying agent;
- wherein the shell-forming monomer comprises an alkenyl aromatic compound.
A core-shell particle, comprising:
- a crosslinked polydimethylsiloxane core;
- a shell comprising a styrene homopolymer or copolymer;
- and
- covalent linkages between the crosslinked polydimethylsiloxane core and the shell;
- wherein the core-shell particle has a mean diameter of 220 to 300 nanometers;
- and
- wherein the core-shell particle has a gel content of 80 to 95 percent measured after 48 hours immersion in toluene at 23° C.
A thermoplastic composition, comprising:
- a polymer;
- and
- a core-shell particle, comprising
- a crosslinked polydimethylsiloxane core;
- a shell comprising a styrene homopolymer or copolymer;
- and
- covalent linkages between the crosslinked polydimethylsiloxane core and the shell;
- wherein the core-shell particle has a mean diameter of 220 to 300 nanometers;
- and
- wherein the core-shell particle has a gel content of 80 to 95 percent measured after 48 hours immersion in toluene at 23° C.
Dependencies are inferred from the claim text.