Polycarbonate resin composition, method for producing same and molded article of this resin composition

A molded article of polycarbonate resin, comprising:

• a polycarbonate resin (a) and a polycarbonate resin (b) having structural units different from the polycarbonate resin (a);
• wherein the polycarbonate resin (a) comprises structural units derived from a compound of formula (1):
• wherein
• each of R1 and R2 which are independent of each other, is a substituted or non-substituted C1-20 alkyl group or a substituted or non-substituted aryl group, each of R3 and R4 which are independent of each other, is a hydrogen atom, a substituted or non-substituted C1-20 alkyl group or a substituted or non-substituted aryl group, and X is a single bond, a carbonyl group, a substituted or non-substituted alkylidene group, an oxidized or non-oxidized sulfur atom, or an oxygen atom;
• wherein
• a ratio of the content [S] of the structural units of formula (1) on the surface of the molded article to a content [T] in the entire molded article ([S]/[T]) is higher than 1.00 and at most 2.00, and
• wherein
• the polycarbonate resin satisfies the following requirements:
• (i) the pencil hardness of the polycarbonate resin (a) as specified by ISO 15184 is higher than the pencil hardness of the polycarbonate resin (b) as specified by ISO 15184;
• (ii) the glass transition point Tg(a) of the polycarbonate resin (a) and the glass transition point Tg(b) of the polycarbonate resin (b) satisfy the relation of the following Formula:
• Tg(b)−45° C.<(a)<Tg(b)−10° C.
• and (iii) the pencil hardness of the polycarbonate resin composition as specified by ISO 15184 is higher by at least two ranks than the pencil hardness of the polycarbonate resin (b) as specified by ISO 15184.