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US 2003/0195329 A1Published application
Aromatic polycarbonate, composition thereof , and use
OwnerWataru Funakoshi, Hiroaki Kaneko +3inventors
InventorsWataru Funakoshi, Hiroaki Kaneko, Takanori Miyoshi, Yuichi Kageyama, Katsushi Sasaki
Life of this patent
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Abstract
An aromatic polycarbonate which has a low radical concentration and retains a good color, transparency, durability and stability even after it is kept under high temperature and high humidity for a long time and a composition thereof. The polycarbonate and composition are advantageously used in an optical disk substrate.
Claims25
An aromatic polycarbonate which comprises (A) a recurring unit represented by the following formula (a):
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- wherein R1, R2, R3 and R4 are each independently a hydrogen atom, halogen atom, alkyl group having 1 to 10 carbon atoms, aryl group having 6 to 10 carbon atoms, cycloalkyl group or aralkyl group having 7 to 10 carbon atoms, and W is an alkylene group having 1 to 6 carbon atoms, alkylidene group having 2 to 10 carbon atoms, cycloalkylene group having 6 to 10 carbon atoms, cycloalkylidene group having 6 to 10 carbon atoms, alkylene-arylene-alkylene group having 8 to 15 carbon atoms, oxygen atom, sulfur atom, sulfoxide group, sulfone group or single bond, as a main recurring unit,
- and which has (B) a viscosity-average molecular weight of 10,000 to 100,000, (C) terminal groups consisting essentially of an aryloxy group and a phenolic hydroxyl group, the molar ratio of the aryloxy group to the phenolic hydroxyl group being 97/3 to 40/60, (D) a melt viscosity stability of 0.5% or less, and (E1) a peak at 3,290±50 G in magnetic field, the (ΔI×(ΔH)2) value obtained from the height (ΔI) of this peak and a magnetic field difference (ΔH) between the bottom of the peak and the top of the peak being 500 or less.
An aromatic polycarbonate which comprises (A) a recurring unit represented by the following formula (a):
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- wherein R1, R2, R3 and R4 are each independently a hydrogen atom, halogen atom, alkyl group having 1 to 10 carbon atoms, aryl group having 6 to 10 carbon atoms, cycloalkyl group or aralkyl group having 7 to 10 carbon atoms, and W is an alkylene group having 1 to 6 carbon atoms, alkylidene group having 2 to 10 carbon atoms, cycloalkylene group having 6 to 10 carbon atoms, cycloalkylidene group having 6 to 10 carbon atoms, alkylene-arylene-alkylene group having 8 to 15 carbon atoms, oxygen atom, sulfur atom, sulfoxide group, sulfone group or single bond, as a main recurring unit,
- and which has (B) a viscosity-average molecular weight of 10,000 to 100,000, (C) terminal groups consisting essentially of an aryloxy group and a phenolic hydroxyl group, the molar ratio of the aryloxy group to the phenolic hydroxyl group being 97/3 to 40/60, (D) a melt viscosity stability of 0.5% or less, and (E2) a radical concentration of 1×1015 or less (per g.polycarbonate).
An aromatic polycarbonate composition comprising:
- (1) 100 parts by weight of an aromatic polycarbonate which comprises (A) a recurring unit represented by the following formula (a):
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- wherein R1, R 2, R3 and R4 are each independently a hydrogen atom, halogen atom, alkyl group having 1 to 10 carbon atoms, aryl group having 6 to 10 carbon atoms, cycloalkyl group or aralkyl group having 7 to 10 carbon atoms, and W is an alkylene group having 1 to 6 carbon atoms, alkylidene group having 2 to 10 carbon atoms, cycloalkylene group having 6 to 10 carbon atoms, cycloalkylidene group having 6 to 10 carbon atoms, alkylene-arylene-alkylene group having 8 to 15 carbon atoms, oxygen atom, sulfur atom, sulfoxide group, sulfone group or single bond, as a main recurring unit,
- and which has (B) a viscosity-average molecular weight of 10,000 to 100,000, (C) terminal groups consisting essentially of an aryloxy group and a phenolic hydroxyl group, the molar ratio of the aryloxy group to the phenolic hydroxyl group being 97/3 to 40/60 and (D) a melt viscosity stability of 0.5% or less;
- and
- (2) 5×10−3 to 2×10−1 part by weight of a partial ester of a higher fatty acid having 8 to 25 carbon atoms and a polyhydric alcohol;
- and having (3)-1 a peak at 3,290±50 G in magnetic field, the (ΔI×(ΔH)2) value obtained from the height (ΔI) of this peak and a magnetic field difference (ΔH) between the bottom of the peak and the top of the peak being 650 or less, and (4)-1 a (ΔI×(ΔH)2) value of 800 or less after it is kept molten at 380° C. for 10 minutes.
4 more elements
An aromatic polycarbonate composition comprising:
- (1) 100 parts by weight of an aromatic polycarbonate which comprises (A) a recurring unit represented by the following formula (a):
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- wherein R1, R 2, R3 and R4 are each independently a hydrogen atom, halogen atom, alkyl group having 1 to 10 carbon atoms, aryl group having 6 to 10 carbon atoms, cycloalkyl group or aralkyl group having 7 to 10 carbon atoms, and W is an alkylene group having 1 to 6 carbon atoms, alkylidene group having 2 to 10 carbon atoms, cycloalkylene group having 6 to 10 carbon atoms, cycloalkylidene group having 6 to 10 carbon atoms, alkylene-arylene-alkylene group having 8 to 15 carbon atoms, oxygen atom, sulfur atom, sulfoxide group, sulfone group or single bond, as a main recurring unit,
- and which has (B) a viscosity-average molecular weight of 10,000 to 100,000, (C) terminal groups consisting essentially of an aryloxy group and a phenolic hydroxyl group, the molar ratio of the aryloxy group to the phenolic hydroxyl group being 97/3 to 40/60 and (D) a melt viscosity stability of 0.5% or less, and
- (2) 5×10−3 to 2×10−1 part by weight of a partial ester of a higher fatty acid having 8 to 25 carbon atoms and a polyhydric alcohol;
- and having (3)-2 a radical concentration of 1×1015 or less (per g.polycarbonate) and (4)-2 a radical concentration of 2×1015 or less (per g polycarbonate) after it is kept molten at 380° C. for 10 minutes.
3 more elements
Dependencies are inferred from the claim text.