摘要:
A polymeric material suitable for making a substrate for optical data storage disks is disclosed. The material, preferably aromatic polycarbonate is characterized in that the potential on 95 to 100% of the total surface of a disk molded therefrom is from −1.5 to +1.5 kV, and in that the potential on 0 to 5% of the total surface of said disk is between −1.5 and −2.5, and +1.5 to +2.5, and in that the potential on no more than 1% of the total surface of said disk is less than −2.5 kV and more than +2.5 kV. The potential measurements are carried out by means of a Monroe probe at a distance of 3.5 mm from the surface of the disk, the scanning region is in each case 12 cm in the X- and Y-direction, and in each case in steps of 2 mm in the X- and in the Y-directions.
摘要:
A polycarbonate resin comprising fluorescing particles that feature a particular size distribution is disclosed. The size distribution of these particles that fluoresce upon excitation at wavelengths of 400-440 nm, 50× magnification and illumination time of 40 msec per scan was found to be critical in determining the suitability of the resin for optical, particularly optical storage, applications.
摘要:
A substrate material, preferably polycarbonate, suitable for producing transparent injection-molded coated disks is disclosed. The material is characterized in that a substrate molded therefrom has an electrical field (measured within 5 minutes of its molding and at a distance of 100 mm from the surface) of −30 to 0 kV/m.
摘要:
This invention relates to an optical recording medium in which at least a recording layer and a light transmitting layer are sequentially formed on a substrate and in which the light is illuminated from the light transmitting layer side for recording and/or reproducing information signals, said substrate comprising an injection molded part, and said substrate having a Young's modulus E of at least 2.15 GPa and a Q factor of lower than 160 measured at 25° C. at 2000 Hz in accordance to ASTM E 756-05 05 and a transcriptability of the pit/groove structure of >85%.
摘要翻译:本发明涉及一种光记录介质,其中至少记录层和透光层依次形成在基板上,并且其中光从光透射层侧照射以用于记录和/或再现信息信号,所述基板 包括注塑部件,并且所述基材根据ASTM E 756-05 05在2000Hz下在25℃下测量的杨氏模量E为至少2.15GPa和低于160的Q因子,并且其转录率 坑/槽结构> 85%。
摘要:
This invention relates to an optical recording medium in which at least a recording layer and a light transmitting layer are sequentially formed on a substrate and in which the light is illuminated from the light transmitting layer side for recording and/or reproducing information signals, said substrate comprising an injection molded part, and said substrate having a Young's modulus E of at least 2.15 GPa and a Q factor of lower than 160 measured at 25° C. at 2000 Hz in accordance to ASTM E 756-05 05 and a transcriptability of the pit/groove structure of >85%.
摘要翻译:本发明涉及一种光记录介质,其中至少记录层和透光层依次形成在基板上,并且其中光从光透射层侧照射以用于记录和/或再现信息信号,所述基板 包括注塑部件,并且所述基材根据ASTM E 756-05 05在2000Hz下在25℃下测量的杨氏模量E为至少2.15GPa和低于160的Q因子,并且其转录率 坑/槽结构> 85%。
摘要:
A polycarbonate resin that after alkaline hydrolysis with sodium hydroxide contain an amount of 0.01 to 150 ppm of carbamate compounds according to formula (1) wherein R1 and R2 independently of one another denote hydrogen or C1-C12-alkyl, or together denote C4-C12-alkylidene, and R3 and R4 independently of one another denote hydrogen, C1-C12-alkyl or phenyl, or together with the carbon atom to which they are bonded form cyclohexyl or trimethylcyclohexyl, said amount measured after alkaline hydrolysis with sodium hydroxide by high pressure liquid chromatography.
摘要:
The present invention provides a polycarbonate resin produced by the continuous interfacial process characterized in that after alkaline hydrolysis with sodium hydroxide, the polycarbonate resin contains an amount of 0.01 to 150 ppm of carbamate compounds according to formula (1) said amount measured by high pressure liquid chromatography, wherein R1 and R2 independently of one another denote hydrogen or C1-C12-alkyl, or together denote C4-C12-alkylidene, and R3 and R4 independently of one another denote hydrogen. C1-C12-alkyl or phenyl, or together with the carbon atom to which they are bonded form cyclohexyl or trimethylcyclohexyl, the process comprising phosgene reacting with at least one bisphenol at 8 to 17% molar excess of phosgene relative to the bisphenol.
摘要:
A phenolic compound having a branched structure is disclosed. The compound conforms to HO—Ar1—X—Ar2—[Y—W]n (1) wherein Ar1 and Ar2 independently denote an optionally substituted mononuclear or polynuclear aromatic moiety, X and Y independently denote a single bond or a divalent radical, W denotes an optionally substituted mononuclear or polynuclear aromatic moiety or an aliphatic or cycloaliphatic radical, and n is 1 to 5, is useful as a terminal group in polycarbonates, polyester carbonates and polyesters. Also disclosed is a process for producing such resins where the disclosed compound is a chain terminator.
摘要:
A process of using of a particularly substituted phenol as a chain terminator of a polymeric resin is disclosed. The chain terminator is a member selected from among ortho-substituted phenol, metha-substituted phenol, and their corresponding coupled esters. The polymeric resin is selected among polycarbonate, polyester carbonate and polyester. The thus chain terminated resin is suitable for producing molded parts and extrudates. Also disclosed are the process for producing these polymers and processes for producing the molded parts and extrudates.
摘要:
The use of phenols having a branched structure as terminal groups in polycarbonates, polyester carbonates and polyesters is disclosed. Also disclosed are polycarbonates, polyester carbonates and polyesters having such branched terminal groups, the process for their production and molded parts made therefrom.