Thermoplastic resin composition and molded product using same

Patent metadata

Field	Value
Publication number	US-11987666-B2
Application number	US-201917256294-A
Country	US
Kind code	B2
Filing date	Jul 1, 2019
Priority date	Jun 29, 2018
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

Disclosed are a thermoplastic resin composition and a molded product including the same, and based on 100 parts by weight of a base resin including (A) 70 wt % to 90 wt % of a polybutylene terephthalate resin and (B) 10 wt % to 30 wt % of an acrylate-based graft copolymer, the thermoplastic resin composition includes: (C) 1 part by weight to 5 parts by weight of an epoxy group-containing methacrylate-aromatic vinyl-unsaturated nitrile copolymer; (D) 15 parts by weight to 20 parts by weight of a carbon fiber; (E) 1 part by weight to 5 parts by weight of carbon nanotubes; and (F) 18 parts by weight to 20 parts by weight of aluminum diethyl phosphinate (ADEP).

First claim

The invention claimed is:

1. A thermoplastic resin composition, based on 100 parts by weight of a base resin, comprising
(A) 70 wt % to 90 wt % of a polybutylene terephthalate resin and
(B) 10 wt % to 30 wt % of an acrylate-based graft copolymer, comprising;
(C) 1 part by weight to 5 parts by weight of an epoxy group-containing methacrylate-aromatic vinyl-unsaturated nitrile copolymer;
(D) 15 parts by weight to 20 parts by weight of a carbon fiber;
(E) 1 part by weight to 5 parts by weight of carbon nanotubes; and
(F) 18 parts by weight to 20 parts by weight of aluminum diethylphosphinate.

2. The thermoplastic resin composition of claim 1 , wherein the (A) polybutylene terephthalate resin has an intrinsic viscosity of 0.36 dl/g to 1.60 dl/g.

3. The thermoplastic resin composition of claim 1 , wherein the (B) acrylate-based graft copolymer is a core-shell structured copolymer including a shell layer formed by graft copolymerization of an aromatic vinyl monomer and an unsaturated nitrile monomer to an acrylate-based rubber polymer core.

4. The thermoplastic resin composition of claim 3 , wherein the (B) acrylate-based graft copolymer comprises 40 wt % to 60 wt % of the acrylate-based rubber polymer core and 40 wt % to 60 wt % of a shell layer formed by graft copolymerization of the aromatic vinyl monomer and the unsaturated nitrile monomer.

5. The thermoplastic resin composition of claim 1 , wherein the (B) acrylate-based graft copolymer has an average particle diameter of 200 nm to 500 nm.

6. The thermoplastic resin composition of claim 1 , wherein the (B) acrylate-based graft copolymer is an acrylonitrile-styrene-acrylate graft copolymer (g-ASA).

7. The thermoplastic resin composition of claim 1 , wherein the (C) epoxy group-containing methacrylate-aromatic vinyl-unsaturated nitrile copolymer is obtained by grafting an aromatic vinyl-unsaturated nitrile copolymer to a substituted or unsubstituted glycidyl methacrylate polymer main chain.

8. The thermoplastic resin composition of claim 7 , wherein the substituted or unsubstituted glycidyl methacrylate polymer comprises an ethylene-glycidyl methacrylate copolymer.

9. The thermoplastic resin composition of claim 7 , wherein the (C) epoxy group-containing methacrylate-aromatic vinyl-unsaturated nitrile copolymer is obtained by grafting 30 wt % to 70 wt % of the aromatic vinyl-unsaturated nitrile copolymer with respect to 30 wt % to 70 wt % of the substituted or unsubstituted glycidyl methacrylate polymer.

10. The thermoplastic resin composition of claim 7 , wherein the aromatic vinyl-unsaturated nitrile copolymer is a styrene-acrylonitrile copolymer.

11. The thermoplastic resin composition of claim 10 , wherein
the styrene-acrylonitrile copolymer is obtained by copolymerizing
60 wt % to 75 wt % of styrene, and
25 wt % to 40 wt % of acrylonitrile.

12. The thermoplastic resin composition of claim 1 , wherein the (C) epoxy group-containing methacrylate-aromatic vinyl-unsaturated nitrile copolymer comprises 5 wt % to 10 wt % of a reactive epoxy functional group.

13. The thermoplastic resin composition of claim 1 , wherein the (D) carbon fiber has an average length of 1 mm to 20 mm.

14. The thermoplastic resin composition of claim 1 , wherein the (E) carbon nanotubes comprise single-walled carbon nanotubes, multi-walled carbon nanotubes, or a combination thereof.

15. The thermoplastic resin composition of claim 14 , wherein the multi-walled carbon nanotubes have an average particle diameter of 1 nm to 20 nm and an average length of 1 μm to 10 μm.

16. The thermoplastic resin composition of claim 1 , wherein the (F) aluminum diethylphosphinate comprises 20 wt % to 25 wt % of phosphorus.

17. A molded product comprising the thermoplastic resin composition of claim 1 .

18. The molded product of claim 17 , wherein the molded product has an electromagnetic shielding effectiveness of greater than or equal to 30 dB measured according to ASTM D4935-99.

19. The molded product of claim 17 , wherein the molded product has electrical conductivity of greater than or equal to 10 −1 S/cm.

20. The molded product of claim 17 , wherein the molded product has a flame retardant rating of V-0 according to the UL94 V test (UL94 vertical burning test) of a 3.0 mm thick specimen.

Assignees

• Lotte Chemical Corp

Inventors

• Kim In-Chol
• Kwon Keehae

Classifications

• C08G63/183 Primary

  Terephthalic acids · CPC title

• C08F210/02

  Ethene · CPC title

• C08F220/1804

  C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate · CPC title

• C08F220/325

  containing glycidyl radical, e.g. glycidyl (meth)acrylate · CPC title

• C08K3/041

  Carbon nanotubes · CPC title