Method for the manufacture of a polycarbonate composition
AssigneeSabic Global Technologies B.V.
InventorsRob Boonman, Tamara Marijke Eggenhuisen
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Abstract
A method for the manufacture of a polycarbonate composition having a Yellowness Index of less than 2.0 is disclosed. The composition contains i) a polymer component including aromatic polycarbonate and ii) a bis(2,4-dicumylphenyl)pentaerythritol diphosphite component wherein the bis(2,4-dicumylphenyl)pentaerythritol diphosphite component consists of bis(2,4-dicumylphenyl)pentaerythritol diphosphite, contaminants and/or degradation products derived from bis(2,4-dicumylphenyl)pentaerythritol diphosphite.
Claims13
Method for the manufacture of a polycarbonate composition having a Yellowness Index of less than 2.0, said composition comprising
- i) a polymer component comprising aromatic polycarbonate and
- ii) a bis(2,4-dicumylphenyl) pentaerythritol diphosphite component wherein said bis(2,4-dicumylphenyl) pentaerythritol diphosphite component consists of bis(2,4-dicumylphenyl) pentaerythritol diphosphite, contaminants and/or degradation products derived from bis(2,4-dicumylphenyl) pentaerythritol diphosphite, the method comprising
- providing the polymer component comprising aromatic polycarbonate,
- providing the bis(2,4-dicumyl) pentaerythritol diphosphite component,
- determining the amount of contaminants and/or degradation products derived from bis(2,4-dicumylphenyl) pentaerythritol of said bis(2,4-dicumyl) pentaerythritol diphosphite component, and
- provided said bis(2,4-dicumyl) pentaerythritol diphosphite component contains at least 85 wt. % of bis(2,4-dicumylphenyl) pentaerythritol diphosphite, combining said polymer component with said bis(2,4-dicumyl) pentaerythritol diphosphite component,
- wherein the polycarbonate is interfacial polycarbonate, and wherein the Yellowness Index is determined in accordance with ASTM D1925 measured on a moulded plaque having a thickness of 4 mm and being injection moulded at a maximum temperature of 350° C. and a residence time of 15 minutes.
Method of controlling the Yellowness Index of a polycarbonate composition comprising
- i) a polymer component comprising aromatic polycarbonate and
- ii) a bis(2,4-dicumylphenyl) pentaerythritol diphosphite component wherein said bis(2,4-dicumylphenyl) pentaerythritol diphosphite component consists of bis(2,4-dicumylphenyl) pentaerythritol diphosphite, contaminants and/or degradation products derived from bis(2,4-dicumylphenyl) pentaerythritol diphosphite, the method comprising
- providing a bis(2,4-dicumyl) pentaerythritol diphosphite component
- determining the amount of contaminants and/or degradation products derived from bis(2,4-dicumylphenyl) pentaerythritol of said bis(2,4-dicumyl) pentaerythritol diphosphite component, and
- provided said bis(2,4-dicumyl) pentaerythritol diphosphite component contains at least 85 wt. % of bis(2,4-dicumylphenyl) pentaerythritol diphosphite, providing a polymer component comprising aromatic polycarbonate and mixing said polymer component with said bis(2,4-dicumyl) pentaerythritol diphosphite component,
- wherein the Yellowness Index is determined in accordance with ASTM D1925 measured on a moulded plaque having a thickness of 4 mm and being injection moulded at a maximum temperature of 350° C. and a residence time of 15 minutes.
Dependencies are inferred from the claim text.