Reinforced thermoplastic compound with chemical resistance

Patent metadata

Field	Value
Publication number	US-9284449-B2
Application number	US-201414309550-A
Country	US
Kind code	B2
Filing date	Jun 19, 2014
Priority date	Jun 19, 2014
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

Disclosed herein are blended thermoplastic compositions comprising at least one polycarbonate component, at least one polybutylene component, at least one polyester ether elastomer component, at least one poly(ethylene-co-ethylacrylate) component, at least one ethylene/alkyl acrylate/glycidyl methacrylate terpolymer component, and at least one glass fiber component. The thermal blended polycarbonate compositions can optionally further comprise a transesterification quenching agent and/or epoxy hydrostabilizer agent. The resulting compositions can be used in the manufacture of articles requiring materials that have high impact strength yet have very high stiffness, while retaining desired dielectric properties and are colorable from white to black.

First claim

What is claimed is:

1. A blended thermoplastic composition comprising:
a) from about 5 wt % to about 25 wt % of a polycarbonate component;
b) from about 20 wt % to about 55 wt % of a polybutylene terephthalate component;
c) from about 0.1 wt % to about 5 wt % of a polyester compatibilizer component;
d) from about 0.1 wt % to about 5 wt % of an acrylic impact modifier component;
e) from about 0.1 wt % to about 3 wt % of an ethylene/alkyl acrylate/glycidyl methacrylate terpolymer compatibilizer component; and
f) from about 10 wt % to about 60 wt % of a glass fiber component;
wherein the wt % ratio of the polycarbonate component to polybutylene terephthalate component is less than or equal to about 0.5;
wherein the blended thermoplastic composition is chemically resistant;
wherein the combined weight percent value of all components does not exceed about 100 wt %; and
wherein all weight percent values are based on the total weight of the composition.

2. The composition of claim 1 , wherein the polycarbonate component is a homopolymer comprising repeating unites derived from bisphenol A.

3. The composition of claim 1 , wherein the polycarbonate component is a polycarbonate copolymer comprising repeating units derived from bisphenol A or sebacic acid, or both.

4. The composition of claim 1 , wherein the polycarbonate component has a weight average molecular weight from about 15,000 to about 50,000 grams/mole, as measured by gel permeation chromatography using BPA polycarbonate standards.

5. The composition of claim 1 , wherein the polycarbonate component has a melt volume flow rate (MVR) from about 17 grams/10 minutes to about 32 grams/10 minutes when measured at 300° C. and under a load of 1.2 kg according to ASTM D1238.

6. The composition of claim 1 , wherein the polybutylene terephthalate component has an intrinsic viscosity from about 0.50 to about 0.80.

7. The composition of claim 1 , wherein the glass fiber component is present in an amount from about 20 wt % to about 55 wt %.

8. The composition of claim 1 , wherein the glass fiber component is present in an amount from about 25 wt % to about 60 wt %.

9. The composition of claim 1 , wherein the glass fiber component is present in an amount from about 30 wt % to about 57 wt %.

10. The composition of claim 1 , wherein the glass fiber component is present in an amount from about 43 wt % to about 57 wt %.

11. The composition of claim 1 , wherein the glass fiber is selected from an E-glass, an S-glass, and combinations thereof.

12. The composition of claim 1 , wherein the glass fiber is one or more S-glass materials.

13. The composition of claim 1 , wherein the glass fiber is one or more E-glass materials.

14. The composition of claim 1 , wherein the glass fiber is chopped.

15. The composition of claim 1 , wherein the glass fiber has a length from about 0.2 mm to about 20 mm.

16. The composition of claim 1 , wherein the glass fiber has a circular cross-sectional area.

17. The composition of claim 1 , wherein the glass fiber has a diameter from about 1 μm to about 35 μm.

18. The composition of claim 1 , further comprising a transesterification quenching agent.

19. The composition of claim 18 , wherein the transesterification quenching agent is selected from an acidic phosphate salt, a Group IB phosphate salt, a Group IIB phosphate salt, a phosphorus oxo-acid, and mixtures thereof.

20. The composition of claim 18 , wherein the transesterification quenching agent is present in an amount from greater than about 0 wt % to about 1 wt %.

21. The composition of claim 1 , further comprising an epoxy hydrostabilizer agent.

22. The composition of claim 21 , wherein the epoxy hydrostabilizer agent is an oligomeric epoxide.

23. The composition of claim 21 , wherein the epoxy hydrostabilizer agent has an epoxide equivalent weight from about 400 g/eq to about 2000 g/eq.

24. The composition of claim 1 , further comprising an additive comprising an antioxidant, antistatic agent, chain extender, colorant, de-molding agent, dye, flow promoter, flow modifier, light stabilizer, lubricant, mold release agent, pigment, quenching agent, thermal stabilizer, UV absorbent substance, UV reflectant substance, and UV stabilizer, or combinations thereof.

25. The composition of claim 1 , wherein a molded sample of the blended thermoplastic composition has notched Izod impact strength greater than or equal to about 140 J/m when determined in accordance with ASTM D256.

26. The composition of claim 1 , wherein a molded sample of the blended thermoplastic composition has notched Izod impact strength greater than or equal to about 150 J/m when determined in accordance with ASTM D256.

27. The composition of claim 1 , wherein a molded sample of the blended thermoplastic composition has a dielectric constant less than or equal to about 4.0.

28. An article comprising a composition of claim 1 .

29. The article of claim 28 , wherein the article is extrusion molded or injection molded.

30. The article of claim 28 , wherein the article is selected from a computer device, electromagnetic interference device, printed circuit, Wi-Fi device, Bluetooth device, GPS device, cellular antenna device, smart phone device, automotive device, medical device, sensor device, security device, shielding device, RF antenna device, LED device and RFID device.

31. A chemically resistant blended thermoplastic composition comprising:
a) from about 5 wt % to about 25 wt % of a polycarbonate component;
b) from about 20 wt % to about 55 wt % of a polybutylene terephthalate component;
c) from about 0.1 wt % to about 5 wt % of a polyester compatibilizer component;
d) from about 0.1 wt % to about 5 wt % of an acrylic impact modifier component;
e) from about 0.1 wt % to about 3 wt % of an ethylene/alkyl acrylate/glycidyl methacrylate terpolymer compatibilizer component; and
f) from about 10 wt % to about 60 wt % of a glass fiber component;
wherein the wt % ratio of the polycarbonate component to polybutylene terephthalate component is less than or equal to about 0.5;
wherein the combined weight percent value of all components does not exceed about 100 wt %;
wherein all weight percent values are based on the total weight of the composition;
wherein a molded sample of the blended thermoplastic composition has notched Izod impact strength greater than or equal to about 140 J/m when determined in accordance with ASTM D256; and
wherein a molded sample of the blended thermoplastic composition has a dielectric constant less than or equal to about 4.0.

32. A method of improving the impact strength and dielectric constant of a blended thermoplastic composition, the method comprising the step of combining;
a) from about 5 wt % to about 25 wt % of a polycarbonate component;
b) from about 20 wt % to about 55 wt % of a polybutylene terephthalate component;
c) from about 0.1 wt % to about 5 wt % of a polyester compatibilizer component;
d) from about 0.1 wt % to about 5 wt % of an acrylic impact modifier component;
e) from about 0.1 wt % to about 3 wt % of a polycarbonate an ethylene/alkyl acrylate/glycidyl methacrylate terpolymer compatibilizer component; and
f) from about 10 wt % to about 60 wt % of a glass fiber component;
wherein the wt % ratio of the polycarbonate component to po

Assignees

• Sabic Global Technologies Bv

Inventors

• Sun Xiaoyu
• He Yuanqing

Classifications

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08K7/14

  Glass · CPC title

• C08L67/03 Primary

  the dicarboxylic acids and dihydroxy compounds having the carboxyl- and the hydroxy groups directly linked to aromatic rings · CPC title

• C08L2666/18

  Polyesters or polycarbonates according to C08L67/00 - C08L69/00; Derivatives thereof · CPC title

• C08L2666/02

  Organic macromolecular compounds, natural resins, waxes or and bituminous materials · CPC title