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US 6,646,045 B2Granted
Thermoplastic molding compositions
AssigneeBayer Aktiengesellschaft
InventorHerbert Eichenauer
Life of this patent
Estimating the term…
Abstract
Thermoplastic molding compositions containing graft polymers produced with different initiator systems are disclosed. The compositions are distinguished by a combination of good toughness and reduced opacity. As a result, appreciably smaller quantities of pigment are needed to color the molding composition.
Claims25
A thermoplastic molding composition comprising
- A) at least one first grafted rubber that is a product of free-radical emulsion polymerisation wherein at least one vinyl monomer is polymerized in the presence of at least one rubber a) that is present in the form of a latex, said rubber having a glass transition temperature lower than 0° C., the polymerization being initiated by at least one compound selected from the group consisting of ammonium persulfate, potassium persulfate and sodium persulfate,
- B) at least one second grafted rubber that is a product of free-radical emulsion polymerisation wherein at least one vinyl monomer is polymerized in the presence of at least one rubber b) that is present in the form of a latex, said rubber having a glass transition temperature lower than 0° C., the polymerization being initiated by at least one azo compound, and optionally
- C) at least one thermoplastic, rubber-free polymer that is the product of the polymerisation of at least one resin-forming vinyl monomer.
A process for the production of thermoplastic molding compositions comprising mixing at an elevated temperature
- A) at least one grafted rubber that is a product of free-radical emulsion polymerisation wherein at least one vinyl monomer is polymerized in the presence of at least one rubber a) that is present in the form of a latex, said rubber having a glass transition temperature lower than 0° C., the polymerization being initiated by at least one compound selected from the group consisting of ammonium persulfate, potassium persulfate and sodium persulfate, with
- B) at least one grafted rubber that is a product of free-radical emulsion polymerisation wherein at least one vinyl monomer is polymerized in the presence of at least one rubber b) that is present in the form of a latex, said rubber having a glass transition temperature lower than 0° C., the polymerization being initiated by at least one azo compound, and optionally
- C) at least one thermoplastic, rubber-free polymer that is the product of the polymerisation of at least one resin-forming vinyl monomer.
Dependencies are inferred from the claim text.