HIGHLY BRANCHED POLYCARBONATE RESIN AND METHOD FOR PREPARING THE SAME

• Main Authors: JANG, BOK NAM, LIM, HO SUB, BAE, JIN YONG, CHOI, KYU BUEM
• Format: Patent
• Language: English; Korean
• Published: 17.02.2014
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

A polycarbonate resin in the present invention is polymerized by a branching agent repregented by chemical formula 2, Mark-Houwink constant thereof is 0.4-0.60, and the concentration of a terminal hydroxyl group is 22% of total terminal groups. The branched polycarbonate resin remarkably decreases the concentration of hydroxyl groups so yellowness is improved and highly branched structure can be obtained. In the chemical formula 1, each of R1, R2, R3, and R4 is independently a substituted or non-substituted C1-10 alkyl group, a substituted or non-substituted C6-C18 aryl group, a C1-C10 alkyl group with halogen or a C1-C10 alkoxy group, or a C6-C18 aryl group with halogen or a C1-C10 alkoxy group substituent; W is a linear, branched, or cyclic saturated or unsaturated hydrocarbon group, saturated or unsaturated cyclic hydrocarbon substituent-containing hydro carbon group, an O or S-containing hydro carbon group, or S.