Polycarbonate substrates
AssigneesBayer Aktiengesellschaft, Bayer Antwerpen N.V.
InventorsMichael Bödiger, Steffen Kühling, Franky Bruynseels, Dirk van Meirvenne, René de Cleyn
Life of this patent
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Abstract
Polycarbonate substrates, the preparation of which is based on 1,1-bis-(4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, and their use for producing shaped articles with particularly high purity and extremely high surface brilliance and also the shaped articles which can be produced from the polycarbonate substrate are described.
Claims8
Polycarbonate substrates, the preparation of which is based on 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, with fewer than 300 defects per m2, measured on a 200 μm extruded film.
Polycarbonate substrates, the preparation of which is based on 1,1 -bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, with fewer than 250 defects per m2, measured on a 200 μm extruded film.
Shaped articles prepared from polycarbonate based on 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, with fewer than 300 defects per m2, measured on a 200 μm extruded film.
Disks produced from polycarbonate based on 1,1 -bis-(4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, with fewer than 300 defects per m2, measured on a 200 μm extruded film and with a cloudiness of less than 0.5 %.
Sheets produced from polycarbonate based on 1,1 -bis-(4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, with fewer than 300 defects per m2, measured on a 200 μm extruded film and with a cloudiness of less than 0.5 %.
Dependencies are inferred from the claim text.