Polycarbonate-based resin composition and molded article thereof

Patent metadata

Field	Value
Publication number	US-10294365-B2
Application number	US-201515523039-A
Country	US
Kind code	B2
Filing date	Dec 3, 2015
Priority date	Dec 4, 2014
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

The present invention relates to a polycarbonate-based resin composition and a molded article thereof, and more specifically, to a polycarbonate-based resin composition exhibiting improved impact strength (impact resistance) and chemical resistance while including a glass fiber in a relatively small content, and a molded article formed therefrom.

First claim

The invention claimed is:

1. A polycarbonate-based resin composition comprising:
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, and
an impact-reinforcing agent including a rubber-modified vinyl-based graft copolymer,
wherein the first repeating unit includes a repeating unit represented by Chemical Formula 1 below, and;
the second repeating unit includes at least one repeating unit selected from the group consisting of Chemical Formula 3 below, and
wherein 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 50 to 500:
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 , further comprising: a polycarbonate resin including the aromatic polycarbonate-based first repeating unit represented by Chemical Formula 1.

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 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.

6. 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.

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 2 , 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 under a load of 1.2 kg.

9. The polycarbonate-based resin composition of claim 2 , wherein: the polycarbonate resin and the copolycarbonate resin each have a weight average molecular weight of 1,000 to 100,000 g/mol.

10. The polycarbonate-based resin composition of claim 1 , wherein:
the glass fiber has the length (L) of 2 to 5 mm, and the length (D) of 5 to 40 μm.

11. The polycarbonate-based resin composition of claim 1 , wherein: the glass fiber is surface-coated with a silane-based compound.

12. 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.

13. The polycarbonate-based resin composition of claim 2 , wherein:
the polycarbonate-based resin composition includes:
30 to 93 wt % of the copolycarbonate resin,
0 to 65 wt % of the polycarbonate resin,
1 to 40 wt % of the glass fiber, and
1 to 20 wt % of the impact-reinforcing agent.

14. The polycarbonate-based resin composition of claim 1 , further comprising: an epoxy silane-based additive.

15. The polycarbonate-based resin composition of claim 14 , wherein:
the epoxy silane-based additive is included in a content of 0.1 to 3 wt % based on the total resin composition.

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

Assignees

• Lg Chemical Ltd

Inventors

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

Classifications

• C09K21/08

  containing halogen · CPC title

• C08G64/24

  and phenols · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L83/10

  Block- or graft-copolymers containing polysiloxane sequences (obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C08L51/08, C08L53/00) · CPC title

• C08K7/14

  Glass · CPC title