Polycarbonate resin compositions, and molded articles, films, plates, and injection-molded articles obtained therefrom

1. A polycarbonate resin composition, comprising:

a polycarbonate resin; and

an impact strength modifier,

wherein the polycarbonate resin comprises, as a structural unit in reacted form, a dihydroxy compound comprising, as a part of the structure thereof, a portion represented by formula (1):

CH 2 —O   (1),

wherein the portion represented by formula (1) is not a —CH 2 —O—H moiety, and wherein the dihydroxy compound has formula (2):

wherein the polycarbonate resin has a glass transition temperature lower than 145° C., and

wherein a molded object having a thickness of 3 mm formed from the polycarbonate resin composition has a total light transmittance of 60% or higher.

2. The polycarbonate resin composition of claim 1 , wherein the impact strength modifier comprises an elastomer comprising a copolymer having a glass transition temperature of −10° C. or lower.

3. The polycarbonate resin composition of claim 2 , wherein the elastomer is a thermoplastic elastomer.

4. The polycarbonate resin composition of claim 1 , wherein the impact strength modifier is a copolymer comprising butadiene.

5. The polycarbonate resin composition of claim 1 , comprising from 1 to 25 parts by weight of the impact strength modifier per 100 parts by weight of the polycarbonate resin.

6. A polycarbonate resin composition, comprising:

an impact strength modifier having a core/shell structure comprising a core layer and a shell layer; and

a polycarbonate resin comprising, as a structural unit in reacted form, a dihydroxy compound comprising, as a part of the structure thereof, a portion represented by formula (1):

CH 2 —O   (1),

wherein the portion represented by formula (1) is not a —CH 2 —O—H moiety, and wherein the dihydroxy compound has formula (2):

wherein the polycarbonate resin has a glass transition temperature lower than 145° C.

CH 2 —O   (1).

7. The polycarbonate resin composition of claim 6 , wherein the core layer of the impact strength modifier comprises an elastomer comprising a copolymer having a glass transition temperature of −10° C. or lower.

8. The polycarbonate resin composition of claim 7 , wherein the elastomer is a thermoplastic elastomer.

9. The polycarbonate resin composition of claim 6 , wherein the core layer of the impact strength modifier comprises at least one selected from the group consisting of an alkyl acrylate, a silicone/acrylic composite, butadiene, and a butadiene/styrene copolymer.

10. The polycarbonate resin composition of claim 6 , comprising from 0.05-50 parts by weight of the impact strength modifier per 100 parts by weight of the polycarbonate resin.

11. The polycarbonate resin composition of claim 1 or claim 6 , wherein the polycarbonate resin further comprises, as a structural unit in reacted form, an aliphatic dihydroxy compound.

12. The polycarbonate resin composition of claim 11 , wherein the aliphatic dihydroxy compound is an alicyclic dihydroxy compound.

13. The polycarbonate resin composition of claim 11 , wherein the polycarbonate resin comprises 20 mol % or more of the structural units of the aliphatic dihydroxy compound, based on all structural units of dihydroxy compounds.

14. The polycarbonate resin composition of claim 1 or claim 6 , wherein the polycarbonate comprises 1-90 mol % of the structural units of the dihydroxy compound.

15. The polycarbonate resin composition of claim 1 or claim 6 , wherein the polycarbonate resin has a reduced viscosity of 0.4-1.4 dL/g.

16. A polycarbonate resin composition, comprising a mixture (X) comprising:

(A) a polycarbonate resin comprising, as a structural unit in reacted form:

(a) a dihydroxy compound comprising, a part of the structure thereof, a portion represented by formula (1):

CH 2 —O   (1)

wherein the portion represented by formula (1) is not a —CH 2 —O—H moiety, and wherein the dihydroxy compound has formula (2):

 and

(b) an alicyclic dihydroxy compound; and

(B) from 1-20 mass %, based on a total mass of the mixture (X), of an impact strength modifier comprising a flexible styrene-comprising resin having a styrene content of 10-40% by mass.

17. The polycarbonate resin composition of claim 16 , wherein the proportion of the structural units (b) to the polycarbonate resin (A) is 30-80% by mole.

18. The polycarbonate resin composition of claim 16 , wherein the difference in average refractive index between the polycarbonate resin (A) and the flexible styrene-comprising resin (B) ([average refractive index of (A)]−[average refractive index of (B)]) is from −0.015 to +0.015.

19. The polycarbonate resin composition of claim 16 , wherein the flexible styrene-comprising resin (B) is partly or completely hydrogenated.

20. The polycarbonate resin composition of claim 16 , wherein the flexible styrene-comprising resin (B) comprises a functional group having polarity.

21. The polycarbonate resin composition of claim 20 , wherein the functional group having polarity is an acid anhydride group.

22. The polycarbonate resin composition of claim 16 , having a haze of 10% or less after having been molded in a thickness of 0.1 mm, the haze being measured in accordance with JIS K7105.

23. A molded polycarbonate resin article obtained by a process comprising molding the polycarbonate resin composition of claim 1 .

24. The molded polycarbonate resin article of claim 23 , wherein the molding is injection molding.

25. A film obtained by a process comprising molding the polycarbonate resin composition according to claim 1 .

26. A plate obtained by a process comprising molding the polycarbonate resin composition according to claim 1 .