Resin composition and molded body of same

1. A foam-molded body, comprising a resin composition comprising a polycarbonate resin having at least a structural unit derived from a dihydroxy compound represented by formula (1):

wherein, in the structural unit derived from the dihydroxy compound represented by formula (1), the hydroxyl oxygens of formula (1) are present as oxygens contained in carbonate groups of the polycarbonate resin,

and wherein:

an average diameter of bubbles in said foam-molded body is 100 μm or less;

a strain-hardening factor of uniaxial extensional viscosity of said resin composition is from 0.1 to 5;

the polycarbonate resin further comprises a structural unit derived from a compound comprising three or more hydroxy groups, said compound comprising three or more hydroxyl groups being contained in a ratio of 0.2 to 2 mol % based on structural units derived from all dihydroxy-containing compounds contained in the polycarbonate resin; or

the resin composition further comprises a compound having two or more functional groups selected from the group consisting of a carbodiimide, an isocyanate, an epoxy, a silane, an acid anhydride, an oxazoline, and a mixture thereof.

2. The foam-molded body of claim 1 , wherein the polycarbonate resin is a copolymer of the structural unit derived from the dihydroxy compound of formula (1) and a structural unit derived from another dihydroxy compound.

3. The foam-molded body of claim 2 , wherein the structural unit derived from another dihydroxy compound is any one structural unit selected from the group consisting of

HO—R 1 —OH  (2),

HO—CH 2 —R 2 —CH 2 —OH  (3),

H—(O—R 3 ) p —OH  (4), and

HO—R 4 —OH  (5),

wherein:

R 1 represents a substituted or unsubstituted cycloalkylene group having a carbon number of 4 to 20;

R 2 represents a substituted or unsubstituted cycloalkylene group having a carbon number of 4 to 20;

R 3 represents a substituted or unsubstituted alkylene group having a carbon number of 2 to 10;

p represents an integer of 2 to 100; and

R 4 represents a substituted or unsubstituted alkylene group having a carbon number of 2 to 20 or a group having a substituted or unsubstituted acetal ring.

4. The foam-molded body of claim 2 , wherein the structural unit derived from another dihydroxy compound is a structural unit derived from any one member selected from the group consisting of a cyclohexanedimethanol compound, a tricyclodecanedimethanol compound and a hexanediol compound.

5. The foam-molded body of claim 1 , wherein said resin composition further comprises a thermoplastic resin.

6. A polycarbonate resin composition, comprising a polycarbonate resin having at least a structural unit derived from a dihydroxy compound represented by formula (1):

wherein, in the structural unit derived from the dihydroxy compound represented by formula (1), the hydroxyl oxygens of formula (1) are present as oxygens contained in carbonate groups of the polycarbonate resin,

and wherein a strain-hardening factor of uniaxial extensional viscosity of the resin composition is from 0.1 to 5.

7. The polycarbonate resin composition of claim 6 , wherein said polycarbonate resin is a copolymer of the structural unit derived from the dihydroxy compound represented by formula (1) and a structural unit derived from another dihydroxy compound.

8. The polycarbonate resin composition of claim 7 , wherein the structural unit derived from another dihydroxy compound is any one structural unit selected from the group consisting of

HO—R 1 —OH  (2),

HO—CH 2 —R 2 —CH 2 —OH  (3),

H—(O—R 3 ) p —OH  (4), and

HO—R 4 —OH  (5),

wherein:

R 1 represents a substituted or unsubstituted cycloalkylene group having a carbon number of 4 to 20;

R 2 represents a substituted or unsubstituted cycloalkylene group having a carbon number of 4 to 20;

R 3 represents a substituted or unsubstituted alkylene group having a carbon number of 2 to 10;

p represents an integer of 2 to 100; and

R 4 represents a substituted or unsubstituted alkylene group having a carbon number of 2 to 20 or a group having a substituted or unsubstituted acetal ring.

9. The polycarbonate resin composition of claim 7 , wherein the structural unit derived from another dihydroxy compound is a structural unit derived from any one member selected from the group consisting of a cyclohexanedimethanol compound, a tricyclodecanedimethanol compound and a hexanediol compound.

10. The polycarbonate resin composition of claim 6 , further comprising a thermoplastic resin.

11. A molded body formed from the polycarbonate resin composition of claim 6 .