Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
63 words
An aromatic polycarbonate copolymer composed of 1 to 99 mole percent of the unit of 2,2-bis(4-hydroxy-3-tertiary-butyl-phenyl)propane, 99 to 1 mole percent of the unit of a comonomer selected from the group consisting of (1) 2,2-bis(4-hydroxyphenyl)propane, (2) 4,4'-dihydroxy-2,2,2-triphenylethane, (3) 2,2-bis(4-hydroxy-3-methylphenyl)-propane, (4) 1,1'-bis(4-hydroxyphenyl)-p-diisopropylbenzene, (5) 1,1'-bis(4-hydroxyphenyl)-m-diisopropyl-benzene, (6) 2,2-bis(4-hydroxyphenyl)butane, (7) 2,2-bis(4-hydroxyphenyl)-4-methylpentane, (8) 2,2-bis(4-hydroxyphenyl)octane, (9) 1,1-bis(4-hydroxyphenyl)cyclohexane and (10) 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane and a carbonate group located between the two units.
Claim 2
Dependent Claim
63 words
An aromatic polycarbonate copolymer composed of 1 to 99 mole percent of the unit of 2,2-bis(4-hydroxy-3-tertiary-butyl-phenyl)propane, 99 to 1 mole percent of the unit of a comonomer selected from the group consisting of (1) 2,2-bis(4-hydroxyphenyl)propane, (2) 4,4'-dihydroxy-2,2,2-triphenylethane, (3) 2,2-bis(4-hydroxy-3-methylphenyl)-propane, (4) 1,1'-bis(4-hydroxyphenyl)-p-diisopropylbenzene, (5) 1,1'-bis(4-hydroxyphenyl)-m-diisopropyl-benzene, (6) 2,2-bis(4-hydroxyphenyl)butane, (7) 2,2-bis(4-hydroxyphenyl)-4-methylpentane, (8) 2,2-bis(4-hydroxyphenyl)octane, (9) 1,1-bis(4-hydroxyphenyl)cyclohexane and (10) 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane and a carbonate group located between the two units.
Claim 3
Dependent Claim
24 words
A copolymer as claimed in Claim 1, in which said comonomer is selected from the group consisting of (1), (2), (3), (4) and (5).
Claim 4
Dependent Claim
53 words
A copolymer as claimed in Claim 1, which is composed of 5 to 95 mole percent of the unit of 2,2-bis-(4-hydroxy-3-tertiary-butyl-phenyl)propane, 95 to 5 mole percent of the unit of a comonomer selected from the group consisting of (1), (2), (4), (5) and (9) and a carbonate group located between the two units.
Claim 5
Dependent Claim
52 words
A copolymer as claimed in Claim 1, which is composed of 3 to 97 mole percent of the unit of 2,2-bis-(4-hydroxy-3-tertiary-butyl-phenyl)propane, 97 to 3 mole percent of the unit of a comonomer selected from the group consisting of (6), (7), (8) and (10) and a carbonate group located between the two units.
Claim 6
Dependent Claim
17 words
A copolymer as claimed in Claim 1, which has a viscosity-average molecular weight of 10,000 to 100,000.
Claim 7
Dependent Claim
25 words
An optical disk which comprises a substrate of the copolymer as defined in any of Claims 1 to 5 and a recording layer coated thereon.
Claim 8
Dependent Claim
21 words
An optical disk as claimed in Claim 6, in which the copolymer has a viscosity-average molecular weight of 13,000 to 50,000.