Polycarbonate resin composition, molded article, and multilayer body

Patent metadata

Field	Value
Publication number	US-11873370-B2
Application number	US-201916972880-A
Country	US
Kind code	B2
Filing date	Jun 10, 2019
Priority date	Jun 8, 2018
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

A polycarbonate resin composition may include a first polycarbonate resin and a second polycarbonate resin, which a molded article may include, and a multilayer body may have a resin layer A including the polycarbonate resin composition and a resin layer B including a resin different from the resin layer A. The first polycarbonate resin may include 40% by weight or more of a structural unit of formula (1)

The second polycarbonate resin may include less than 40% by weight of the structural unit of formula (1). The weight ratio of the first polycarbonate resin to the second polycarbonate resin, the first polycarbonate resin/the second polycarbonate resin, may be in a range of from 55/45 to 99/1. The polycarbonate resin composition may have two or more glass transition temperatures.

First claim

The invention claimed is:

1. A polycarbonate resin composition, comprising:
a first polycarbonate resin comprising at least 40% by weight of a structural unit of the formula (1);

a second polycarbonate resin comprising from 1% to less than 40% by weight of the structural unit of the formula (1),
wherein a weight ratio of the first polycarbonate resin to the second polycarbonate resin, as first polycarbonate resin/second polycarbonate resin, is from 55/45 to 99/1, and
wherein the polycarbonate resin composition has at least two glass transition temperatures.

2. The composition of claim 1 , wherein at least one selected from the group consisting of the first polycarbonate resin and the second polycarbonate resin comprises a structural unit derived from at least one dihydroxy compound selected from the group consisting of an aliphatic dihydroxy compound, an alicyclic dihydroxy compound, and an ether group-containing dihydroxy compound other than a dihydroxy compound forming the structural unit of the formula (1).

3. The composition of claim 1 , wherein the first polycarbonate resin comprises from 40 to 80% by weight of the structural unit of the formula (1).

4. The composition of claim 1 , wherein the second polycarbonate resin comprises from 1 to 35% by weight of the structural unit of the formula (1).

5. The composition of claim 1 , wherein the second polycarbonate resin has a number average molecular weight, measured by 1 H-NMR, of from 17,000 to 50,000.

6. The composition of claim 1 , wherein the second polycarbonate resin has a number average molecular weight, measured by 1 H-NMR, B of from 6000 to 12000.

7. The composition of claim 1 , wherein the second polycarbonate resin has a melt viscosity of from 1800 to 3000 Pa·s at a measurement temperature of 220° C. and a shear rate of 91.2 sec −1 .

8. The composition of claim 1 , wherein the second polycarbonate resin has a melt viscosity of from 80 to 500 Pa·s at a measurement temperature of 220° C. and a shear rate of 91.2 sec −1 .

9. The composition of claim 1 , wherein the second polycarbonate resin has a glass transition temperature of from 40 to 80° C.

10. The composition of claim 1 , wherein the second polycarbonate resin comprises at least 45% by weight of a structural unit of the formula (2):

11. The composition of claim 1 , further comprising:
a third polycarbonate resin comprising at least 50% by weight of a structural unit of the formula (3):

wherein R 1 to R 6 are independently H or an optionally substituted alkyl group comprising 1 to carbon atoms,
and/or
an acrylic resin comprising at least 50% by weight of a structural unit of the formula (4):

wherein R 7 is H or an optionally substituted alkyl group comprising 1 to 10 carbon atoms, and R 8 is an optionally substituted aryl group or an optionally substituted aralkyl group.

12. The composition of claim 11 , comprising, with respect to 100 parts by weight of a total of the first polycarbonate resin, the second polycarbonate resin, the third polycarbonate resin, and the acrylic resin:
from 60 to 95 parts by weight of the first polycarbonate resin;
from 3 to less than 40 parts by weight of the second polycarbonate resin; and
from 0.01 to 2 parts by weight of a total of the third polycarbonate resin and the acrylic resin.

13. The composition of claim 11 , wherein the first polycarbonate resin and the second polycarbonate resin each comprise a structural unit of the formula (2)

14. The composition of claim 11 , wherein a glass transition temperature of the first polycarbonate resin is from 90 to 160° C., and
wherein a glass transition temperature of the second polycarbonate resin is from 40 to 110° C.

15. A molded article, comprising:
the composition of claim 1 .

16. The article of claim 15 , in the form of an automobile interior part or an automobile exterior part.

17. The article of claim 15 , configured for an on-vehicle display, a car navigation, a car audio, a console panel, a dashboard, or a door trim article.

18. A multilayer body, comprising:
a resin layer A comprising the composition of claim 1 ; and
a resin layer B comprising a resin different from the resin layer A.

19. The multilayer body of claim 18 , wherein, in a cross section in a layered direction of the multilayer body, a layered structure of the resin layer A and the resin layer B is asymmetric across a center line of a thickness of the multilayer body in terms of thickness and/or material.

20. The multilayer body of claim 18 , having a total thickness in a range of from 10 to 500 μm.

21. The multilayer body of claim 18 , wherein a thickness ratio of the resin layer A to the resin layer B, as resin layer B/resin layer A, is in a range of from 0.02 to 50.

22. The multilayer body of claim 18 , wherein the second polycarbonate resin comprises a structural unit of formula (2)

23. The multilayer body of claim 18 , wherein a glass transition temperature of the first polycarbonate resin is in a range of from 90 to 160° C., and
wherein a glass transition temperature of the second polycarbonate resin is in a range of from 40 to 80° C.

Assignees

• Mitsubishi Chem Corp

Inventors

• Namiki Shingo
• Hirami Yuuichi
• Kanemasa Tomoaki
• SHIMADA Taiki
• Ando Masato
• Kosuge Akira
• Ohta Shigeki
• KUTSUNUGI Yuuichirou
• KAKIUCHI Asami

Classifications

• C08G64/0208 Primary

  saturated · CPC title

• B32B27/08

  of synthetic resin · CPC title

• B32B27/365

  comprising polycarbonates · CPC title

• C08G64/06

  not containing aliphatic unsaturation · CPC title

• C08G64/305

  and alcohols · CPC title