Polymer compositions, method of manufacture, and articles formed therefrom
AssigneeSabic Innovative Plastics IP B.V.
InventorsBin Sun, Amit Kulkarni, James Louis DeRudder
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Abstract
An impact resistant polycarbonate composition having improved resistance to polymer degradation comprises an aromatic polycarbonate in admixture with an elastomer-modified graft copolymer that is the product of an emulsion polymerization process, wherein composition is a product of compounding the aromatic polycarbonate and the elastomer-modified graft copolymer in the presence of a buffer comprising a potassium salt of phosphoric acid.
Claims34
An impact resistant polycarbonate composition having improved resistance to polymer degradation comprising an aromatic polycarbonate in admixture with an elastomer-modified graft copolymer that is the product of an emulsion polymerization process, the composition further comprising metallic salts of phosphoric acid, at least one of which is a potassium salt of phosphoric acid, wherein the metallic salts of phosphoric acid are present in the composition in an amount that provides a phosphorus content of 0.01 to 0.16 mol/10 lbs (0.0022 to 0.035 mol/kg), based on the weight of the composition.
An impact resistant polycarbonate composition having improved resistance to polymer degradation comprising an aromatic polycarbonate in admixture with an elastomer-modified graft copolymer that is the product of an emulsion polymerization process, wherein the composition is a product of compounding the aromatic polycarbonate and the elastomer-modified graft copolymer in the presence of a buffer comprising metallic salts of phosphoric acid, wherein the buffer comprises a weak acid form and a conjugate base form that is capable of providing a pH of 6.4 to 7.0 in distilled water, wherein at least one of the weak acid form and conjugate base form comprises a potassium salt of phosphoric acid.
A method of preparing a polycarbonate composition having improved resistance to polymer degradation comprising:
- carrying out emulsion polymerization of a monomer mixture comprising a diene monomer, thereby forming an elastomer polymer;
- grafting monomers onto the elastomer polymer to obtain an elastomer-modified graft copolymer;
- and
- compounding the elastomer-modified graft copolymer with an aromatic polycarbonate in the presence of a buffer comprising metallic salts of phosphoric acid, at least one of which comprises a potassium salt of phosphoric acid.
Dependencies are inferred from the claim text.