Copolymerized polycarbonate resin, method for preparing the same, and article comprising the same
A copolymerized polycarbonate resin includes a repeat unit represented by Formula 1; a repeat unit represented by Formula 2; and a repeat unit represented by Formula 3, wherein the repeat unit represented by Formula 1 is different than the repeat unit represented by Formula 3, and wherein Formula 1, 2, and 3 are the same as defined in the specification. The copolymerized polycarbonate resin can have excellent properties in terms of chemical resistance, thermal resistance, and/or external appearance.
1. A copolymerized polycarbonate resin comprising:
a repeat unit represented by Formula 1 in an amount of about 60 mol % to about 99.8 mol %;
a repeat unit represented by Formula 2; and
a repeat unit represented by Formula 3,
wherein the repeat unit represented by Formula 1 is different than the repeat unit represented by Formula 3,
wherein R 1 and R 2 are the same or different and are each independently substituted or unsubstituted C 1 to C 6 alkyl; and a and b are the same or different and are each independently an integer from 1 to 4,
wherein R 3 and R 4 are the same or different and are each independently substituted or unsubstituted C 1 to C 6 alkyl; and c and d are the same or different and are each independently an integer from 1 to 4,
wherein A is a substituted or unsubstituted C 1 to C 30 hydrocarbon group, a C 1 to C 30 hydrocarbon group including O or S, a halogen acid ester, a carbonic acid ester, CO, S, or SO 2 ; and R 5 , R 6 , R 7 and R 5 are the same or different and are each independently substituted or unsubstituted C 1 to C 6 alkyl.
2. The copolymerized polycarbonate resin according to claim 1 , comprising the repeat unit represented by Formula 2 in an amount of about 0.1 mol % to about 50 mol %, and the repeat unit represented by Formula 3 in an amount of about 0.1 mol % to about 50 mol %.
3. The copolymerized polycarbonate resin according to claim 1 , wherein the copolymerized polycarbonate resin has a weight average molecular weight of about 15,000 g/mol to about 50,000 g/mol.
4. The copolymerized polycarbonate resin according to claim 1 , wherein the copolymerized polycarbonate resin has a Vicat softening temperature (VST) of about 150° C. or more, as measured in accordance with ASTM D1525.
5. The copolymerized polycarbonate resin according to claim 1 , wherein the copolymerized polycarbonate resin has a visible light transmittance of about 75% or more, as measured on a 2.5 mm thick flat specimen after dipping the specimen in a thinner for undercoating of a polycarbonate resin for 2 minutes and drying the same at 80° C. for 30 minutes.
6. A method for preparing a copolymerized polycarbonate resin, comprising:
polymerizing a carbonate precursor with a diol mixture of a diol represented by Formula 4 in an amount of about 60 mol % to about 99.8 mol %, a diol represented by Formula 5 and a diol represented by Formula 6,
wherein the diol represented by Formula 4 is different than the diol represented by Formula 6,
wherein R 1 and R 2 are the same or different and are each independently substituted or unsubstituted C 1 to C 6 alkyl; and a and b are the same or different and are each independently an integer from 1 to 4,
wherein R 3 and R 4 are the same or different and are each independently substituted or unsubstituted C 1 to C 6 alkyl; and c and d are the same or different and are each independently an integer from 1 to 4,
wherein A is a substituted or unsubstituted C 1 to C 30 hydrocarbon group, a C 1 to C 30 hydrocarbon group containing O or S, a halogen acid ester, a carbonic acid ester, CO, S, or SO 2 ; and R 5 , R 6 , R 7 and R 5 are the same or different and are each independently substituted or unsubstituted C 1 to C 6 alkyl.
7. The method according to claim 6 , wherein the diol mixture includes the diol represented by Formula 5 in an amount of about 0.1 mol % to about 50 mol %, and the diol represented by Formula 6 in an amount of about 0.1 mol % to about 50 mol %.
8. The method according to claim 6 , wherein the carbonate precursor is diaryl carbonate.
9. The method according to claim 6 , wherein polymerization is performed by melt polymerization.
10. A molded article produced from the copolymerized polycarbonate resin according to claim 1 .
11. The copolymerized polycarbonate resin according to claim 1 , wherein the repeat unit represented by Formula 3 is derived from 3,3′,5,5′-tetramethylbisphenol A.
12. The copolymerized polycarbonate resin according to claim 11 , wherein the repeat unit represented by Formula 1 is derived from 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) and the repeat unit represented by Formula 2 is derived from 4,4′-biphenol.
13. The method according to claim 6 , wherein the diol represented by Formula 6 is 3,3′,5,5′-tetramethylbisphenol A.
14. The method according to claim 13 , wherein the diol represented by Formula 4 is 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) and the diol represented by Formula 5 is 4,4′-biphenol.