Polycarbonate-based resin composition and molded article thereof

Patent metadata

Field	Value
Publication number	US-10240037-B2
Application number	US-201515516619-A
Country	US
Kind code	B2
Filing date	Dec 3, 2015
Priority date	Dec 4, 2014
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

The present invention relates to a polycarbonate-based resin composition and a molded article thereof, and more particularly, to a polycarbonate-based resin composition exhibiting low deformation characteristic, excellent impact strength, excellent appearance surface characteristic, and excellent flame retardancy, and a molded article formed therefrom.

First claim

The invention claimed is:

1. A polycarbonate-based resin composition comprising:
a polycarbonate resin including an aromatic polycarbonate-based first repeating unit,
a copolycarbonate resin including an aromatic polycarbonate-based first repeating unit, and an aromatic polycarbonate-based second repeating unit having one or more siloxane bonds,
a glass fiber,
an impact-reinforcing agent including a rubber-modified vinyl-based graft copolymer, and
a phosphorus-based flame retardant;
wherein the first repeating unit each independently includes a repeating unit represented by Chemical Formula 1 below,
the second repeating unit includes at least one repeating unit selected from the group consisting of Chemical Formula 3 below, and;
the glass fiber has a rectangular, circular or elliptical cross section in a direction perpendicular to a longitudinal direction, and has an aspect ratio according to Equation 1 below of 100 to 500, a length (L) of 2 to 7 mm, and D of 5 to 20 μm:
Aspect ratio (δ)= L/D   [Equation 1]

in Equation 1, L is a length of the glass fiber, D is a length of the longest side of the rectangular cross section, a length of a diameter of the circular cross section, or a length of the longest diameter of the elliptical cross section,

in Chemical Formula 1,
R 1 to R 4 are each independently hydrogen, C 1-10 alkyl, C 1-10 alkoxy, or halogen, and
Z is C 1-10 alkylene unsubstituted or substituted with phenyl, C 3-15 cycloalkylene unsubstituted or substituted with C 1-10 alkyl, O, S, SO, SO 2 , or CO;

in Chemical Formula 3,
X 2 is each independently C 1-10 alkylene,
Y 1 is each independently hydrogen, C 1-6 alkyl, halogen, hydroxy, C 1-6 alkoxy or C 6-20 aryl,
R 6 is each independently hydrogen; C 1-15 alkyl unsubstituted or substituted with oxiranyl, oxiranyl-substituted C 1-10 alkoxy, or C 6-20 aryl; halogen; C 1-10 alkoxy; allyl; C 1-10 haloalkyl; or C 6-20 aryl, and
n2 is an integer of 10 to 200.

2. The polycarbonate-based resin composition of claim 1 , wherein:
the polycarbonate resin has a melt index (MI) of 5 g/10 min to 25 g/10 min at a temperature of 300° C. and a load of 1.2 kg.

3. The polycarbonate-based resin composition of claim 1 , wherein:
the second repeating unit further includes at least one repeating unit selected from the group consisting of Chemical Formula 2 below:

in Chemical Formula 2,
X 1 is each independently C 1-10 alkylene,
R 5 is each independently hydrogen; C 1-15 alkyl unsubstituted or substituted with oxiranyl, oxiranyl-substituted C 1-10 alkoxy, or C 6-20 aryl; halogen; C 1-10 alkoxy; allyl; C 1-10 haloalkyl; or C 6-20 aryl, and
n1 is an integer of 10 to 200.

4. The polycarbonate-based resin composition of claim 1 , wherein:
the repeating unit represented by Chemical Formula 1 is represented by Chemical Formula 1-1 below:

5. The polycarbonate-based resin composition of claim 3 , wherein:
the repeating unit represented by Chemical Formula 2 is represented by Chemical Formula 2-1 below:

in Chemical Formula 2-1,
R 5 and n1 are each the same as defined in Chemical Formula 2 above.

6. The polycarbonate-based resin composition of claim 1 , wherein:
the repeating unit represented by Chemical Formula 3 is represented by Chemical Formula 3-1 below:

in Chemical Formula 3-1,
R 6 and n2 are each the same as defined in Chemical Formula 3 above.

7. The polycarbonate-based resin composition of claim 1 , wherein:
the copolycarbonate resin includes 90 to 99.999 wt % of the first repeating unit and 0.001 to 10 wt % of the second repeating unit.

8. The polycarbonate-based resin composition of claim 1 , wherein:
the polycarbonate resin and the copolycarbonate resin each have a weight average molecular weight of 1,000 to 100,000 g/mol.

9. The polycarbonate-based resin composition of claim 1 , wherein:
the glass fiber is a glass fiber surface-treated with an epoxy silane-based compound or an olefin silane-based compound, or a surface-untreated glass fiber.

10. The polycarbonate-based resin composition of claim 1 , wherein:
the rubber-modified vinyl-based graft copolymer is a graft copolymer having a core-shell structure in which a vinyl-based unsaturated monomer is grafted to a core structure to form a shell,
the core structure including at least one rubber selected from the group consisting of diene-based rubber, acrylate-based rubber and silicone-based rubber.

11. The polycarbonate-based resin composition of claim 1 , wherein:
the phosphorus-based flame retardant includes a condensed phosphoric acid ester represented by Chemical Formula 5 below:

in Chemical Formula 5,
Ar 1 , Ar 2 , Ar 3 and Ar 4 are each independently halogen-free aromatic group,
Q is

R 7 to R 14 are each independently a hydrogen atom or a C 1-5 alkyl group; G is a direct binding, O, S, SO 2 , C(CH 3 ) 2 , CH 2 , and CHPh, and Ph is phenyl group,
n is an integer of 1 or more, and
k and m are each an integer of 0 to 2, and (k+m) is an integer of 0 to 2.

12. The polycarbonate-based resin composition of claim 1 , wherein the polycarbonate-based resin composition includes:
20 to 70 wt % of the polycarbonate resin,
10 to 70 wt % of the copolycarbonate resin,
1 to 20 wt % of the glass fiber,
1 to 10 wt % of the impact-reinforcing agent, and
2 to 15 wt % of the phosphorus-based flame retardant.

13. The polycarbonate-based resin composition of claim 1 , wherein:
the polycarbonate-based resin composition further includes a drip inhibitor of a fluoropolymer.

14. A molded article comprising the polycarbonate-based resin composition of claim 1 .

Assignees

• Lg Chemical Ltd

Inventors

• Lee Jong Hyun
• Lee Su Kyoung
• Kim Min Ji
• Lee Ryul
• Ahn Sung Tae

Classifications

• C09K21/08

  containing halogen · CPC title

• C09K21/14

  Macromolecular materials · CPC title

• C08K2201/004

  Additives being defined by their length · CPC title

• C08G64/24

  and phenols · CPC title

• C08L69/005

  Polyester-carbonates · CPC title