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US 8,569,406 B2Granted
Polycarbonate resin, composition of said resin, and molded article of said resin
AssigneesMitsubishi Chemical Corporation, Mitsubishi Engineering-Plastics Corporation
InventorsRyuuji Uchimura, Kazuyuki Takahashi, Kenji Tsuruhara, Tomonari Yokoyama
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Abstract
To provide a polycarbonate resin composition having improved flame retardancy and moldability. A polycarbonate resin having a ratio of the melt viscosity η10 measured at 300° C. at a shear rate of 10 sec−1 to the melt viscosity η1000 measured at 300° C. at a shear rate of 1000 sec−1 (η10/η1000) of at least 3 and at most 8, a branch parameter G=[η]/[η]lin of at least 0.80 and at most 0.94, and a pencil hardness of at least HB.
Claims19
A branched polycarbonate resin, which has:
- a ratio of the melt viscosity η10 measured at 300° C. at a shear rate of 10 sec−1 to the melt viscosity η1000 measured at 300° C. at a shear rate of 1,000 sec−1 (η10/η1000) of at least 3 and at most 8;
- a branch parameter G=[η]/[η]lin of at least 0.80 and at most 0.94;
- and
- a pencil hardness of at least HB,
- wherein:
- [η] represents the intrinsic viscosity (dl/g) of the branched polycarbonate resin in a methylene chloride solvent at 20° C.;
- and
- [η]lin represents the intrinsic viscosity in a methylene chloride solvent at 20° C. of a linear polycarbonate having the same weight average molecular weight as the branched polycarbonate resin as measured by a GPC method with a general purpose calibration curve.
5 more elements
Dependencies are inferred from the claim text.