Polycarbonate resin and optical article used the same

Details Polycarbonate resin and optical article used the same Polycarbonate resin and optical article used the same

2001-03-29

2002-01-22

Boykin, Terressa M. (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C528S198000

Reexamination Certificate

active

06340737

ABSTRACT:

BACKGROUND OF THE INVENTION
1) Field on the Invention
The present invention relates to a polycarbonate resin with a remarkably reduced oblique incidence birefringence, excellent moldability, excellent transcription and good transparency and an optical article used the same. The polycarbonate resin is applicable to uses of general molding of various materials such as medical instrument parts, food vessels, drinking bottles, photoreceptors for electro-photography, toner transfer belts, binders for dye and pigment, gas permeation membranes, toys, materials for window and building, safeguarding materials, OA apparatuses and portable telephones and boxes, and particularly, suitable to the production of optical articles such as optical discs including compact disc, laser disc, optical card, MO disc, digital versatile disc and near field recording optical disc, optical lenses including pick-up lens, spectacle lens and camera lens, optical films and optical sheets including cover layer for near field recording medium and optical filter, optical information transmission media including optical fiber and optical waveguide and photoconductive boards.
2) Prior Art
Recently, a bisphenol A type polycarbonate resin has been widely used as optical materials such as optical disc materials by utilizing its transparency, heat resistance, hydrolysis resistance and dimension stability. However, use of a polycarbonate resin as optical materials caused some problems. Among performances as optical materials, birefringence to change properties of incidence light caused the most important problem.
In order to reduce birefringence, various polycarbonate resin materials have been developed (Japanese Patent Kokai (Laid Open) Nos. 60-215020 and 62-181115). However, also in these developments, reduction of birefringence was not sufficient. Further, recently, reduction of oblique incidence birefringence whose improvement is difficult by controlling molding conditions has been required.
On the other hand, optical disc materials containing polyorganosiloxane have been developed (Japanese Patent Kokai (Laid Open) No. 3-106931). However, in these materials, when the polyorganosiloxane content is increased, transparency to be required for an optical disc could not be maintained, Thus, satisfactory reduction of birefringence could not be attained because the polyorganosiloxane content could not be increased.
Further, in the blend of some resins different in refractive index from each other, white turbidity occurred since it was difficult to disperse uniformly them, so that there occurred problems that use of replaced article in production of other sorts was limited and recycling was difficult.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a polycarbonate resin with a remarkably reduced oblique incidence birefringence, excellent moldability, excellent transcription and good transparency and an optical article used the same.
As a result of extensive studies to solve above-mentioned prior art problems, the inventors have found that a copolymerization resin derived from specific three kinds of bisphenols and a mixture of said copolymerization resin and conventional bisphenol A type polycarbonate resin can be used as high quality optical materials with a remarkably reduced oblique incidence birefringence, excellent moldability, excellent transcription and good transparency, and accomplished the present invention.
That is, the present invention provides a polycarbonate resin obtained by reaction of a compound represented by the following general formula (A), a compound represented by the following general formula (B), a compound represented by the following general formula (C) and a carbonic acid ester-forming compound, wherein an amount of a compound represented by the general formula (A) is 30 to 80% by weight to total amount of a compound represented by the general formula (A) and a compound represented by the general formula (B) and a compound represented by the general formula (C) is 1 to 80% by weight to total amount of a compound represented by the general formula (A), a compound represented by the general formula (B) and a compound represented by the general formula (C) and an intrinsic viscosity of said polycarbonate resin is 0.2 to 1.0 dl/g;
wherein R
1
, R
2
, R
3
and R
4
are, each independently, hydrogen, an alkyl group having 1 to 5 carbon atoms, an aryl group having 6 to 12 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an aralkyl group having 7 to 17 carbon atoms and when said group has carbon atom, said group can have an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms as a substituent(s);
wherein R
5
, R
6
, R
7
and R
8
are, each independently, hydrogen, an alkyl group having 1 to 5 carbon atoms, an aryl group having 6 to 12 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an aralkyl group having 7 to 17 carbon atoms and when said group has carbon atom, said group can have an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms as a substituent(s); R
9
, R
10
, R
11
and R
12
are, each independently, hydrogen, an alkyl group having 1 to 5 carbon atoms, an aryl group having 6 to 12 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an aralkyl group having 7 to 17 carbon atoms and when said group has carbon atom, said group can have an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms as a substituent(s); R
13
is an aliphatic group having 1 to 6 carbon atoms or absent; X is —SiO(R
14
)(R
15
)—, —SiO(R
16
)(R
17
)—, a homopolymer of —SiO(R
14
)(R
15
)— or —SiO(R
16
)(R
17
)— having an average polymerization degree of more than 0 and 200 or below or a random copolymer of —SiO(R
14
)(R
15
)— and —SiO(R
16
)(R
17
)— having an average polymerization degree of more than 0 and 200 or below; R
14
, R
15
, R
16
and R
17
are, each independently, hydrogen, an alkyl group having 1 to 5 carbon atoms, an aryl group having 6 to 12 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an aralkyl group having 7 to 17 carbon atoms and when said group has carbon atom, said group can have an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms as a substituent(s);
wherein R
18
and R
19
are, each independently, hydrogen, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 12 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an aralkyl group having 7 to 17 carbon atoms and when said group has carbon atom, said group can have an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms as a substituent(s);
Y is;
wherein R
20
and R
21
are, each independently, hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or an aryl group having 6 to 12 carbon atoms, or an aliphatic ring or a heterocycle in combination of R
20
and R
21
and when said group has carbon atom, said group can have an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms as a substituent(s) and a is an integer of 0 to 20.
DETAILED DESCRIPTION OF THE INVENTION
The invention will be described in detail below.
Examples of the carbonic acid ester-forming compound include phosgene and bisaryl carbonates such as diphenyl carbonate, di-p-tolyl carbonate, phenyl-p-tolyl carbonate, di-p-chlorophenyl carbonate and dinaphthyl carbonate and a combination of two species of the compounds thereof or above.
The p

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