Polybutylene terephthalate resin composition and thin molded article
View Patent ↗A polybutylene terephthalate resin composition which is free from bleeding and other problems, and improves the flowability (melt-flowability) while maintaining the characteristics such as mechanical strength or toughness. To 100 parts by weight of a composition composed of 50 to 90% by weight of (A) a polybutylene terephthalate resin and 10 to 50% by weight of (B) inorganic filler, is blended 0.05 to 5 parts by weight of (C) a glycerin fatty acid ester being composed of glycerin and/or a dehydrated condensate thereof and a fatty acid having 12 or more carbon atoms and having 200 or more hydroxyl value determined by a method specified in the description.
1. A polybutylene terephthalate resin composition, obtained by blending 100 parts by weight of a composition composed of 50 to 90% by weight of (A) a polybutylene terephthalate resin having an intrinsic viscosity of 0.9 dL/g or less and 10 to 50% by weight of (B) inorganic filler with 0.5 to 3 parts by weight of (C) glycerin fatty acid ester, wherein the glycerin fatty acid ester consists of triglycerin stearate partial ester.
2. The polybutylene terephthalate resin composition according to claim 1 , wherein the composition has a melt viscosity of 130 Pa·s or less at a shear rate of 1000 sec −1 at a temperature of 260° C.
3. The polybutylene terephthalate resin composition according to claim 1 , wherein said (B) inorganic filler is glass fiber.
4. The polybutylene terephthalate resin composition according to claim 1 , comprising 0.5 to 2 parts by weight of the glycerin fatty acid ester.
5. A thin-walled molded article comprising the polybutylene terephthalate resin composition according to claim 1 , having a flow length of 40 mm or more at a thickness of 0.5 mm following injection molding a cylinder temperature of 260° C. and at a mold temperature of 65° C.
6. The thin-walled molded article according to claim 5 , having a position with a thickness of 0.5 mm or less at a part of said molded article.
7. The thin-walled molded article according to claim 6 , being a switch, a capacitor, a connector, an integrated circuit (IC), a relay, a resister, a light-emitting diode (LED), a coil bobbin, and a peripheral device thereof or a housing thereof.
8. The polybutylene terephthalate resin composition according to claim 2 , having a determined melt viscosity of 50 to 130 Pa·s at a shear rate of 1000 sec −1 at a temperature of 260° C.
9. The polybutylene terephthalate resin composition according to claim 3 , having a determined melt viscosity of 50 to 130 Pa·s or less at a shear rate of 1000 sec −1 at a temperature of 260° C.
10. A thin-walled molded article comprising the polybutylene terephthalate resin composition according to claim 2 , having a flow length of 40 mm or more at a thickness of 0.5 mm following injection molding a cylinder temperature of 260° C. and at a mold temperature of 65° C.
11. A thin-walled molded article comprising the polybutylene terephthalate resin composition according to claim 3 , having a flow length of 40 mm or more at a thickness of 0.5 mm following injection molding a cylinder temperature of 260° C. and at a mold temperature of 65° C.
12. A thin-walled molded article comprising the polybutylene terephthalate resin composition according to claim 4 , having a flow length of 40 mm or more at a thickness of 0.5 mm following injection molding a cylinder temperature of 260° C. and at a mold temperature of 65° C.
13. A thin-walled molded article comprising the polybutylene terephthalate resin composition according to claim 8 , having a flow length of 40 mm or more at a thickness of 0.5 mm following injection molding a cylinder temperature of 260° C. and at a mold temperature of 65° C.
14. A thin-walled molded article comprising the polybutylene terephthalate resin composition according to claim 9 , having a flow length of 40 mm or more at a thickness of 0.5 mm following injection molding a cylinder temperature of 260° C. and at a mold temperature of 65° C.
15. The thin-walled molded article according to claim 10 , having a position with a thickness of 0.5 mm or less at a part of said molded article.
16. The thin-walled molded article according to claim 11 , having a position with a thickness of 0.5 mm or less at a part of said molded article.
17. The thin-walled molded article according to claim 12 , having a position with a thickness of 0.5 mm or less at a part of said molded article.
18. The thin-walled molded article according to claim 15 , being a switch, a capacitor, a connector, an integrated circuit (IC), a relay, a resister, a light-emitting diode (LED), a coil bobbin, and a peripheral device thereof or a housing thereof.
19. The thin-walled molded article according to claim 16 , being a switch, a capacitor, a connector, an integrated circuit (IC), a relay, a resister, a light-emitting diode (LED), a coil bobbin, and a peripheral device thereof or a housing thereof.
20. The thin-walled molded article according to claim 17 , being a switch, a capacitor, a connector, an integrated circuit (IC), a relay, a resister, a light-emitting diode (LED), a coil bobbin, and a peripheral device thereof or a housing thereof.
21. The thin-walled molded article according to claim 5 , having a tensile strength of 103 to 147 MPa according to ISO 527-1,2 with a tensile test piece according to ISO 3167 and an elongation of 2.5 to 3.3% according to ISO 527-1,2 with a tensile test piece according to ISO 3167 and a tensile test piece according to ISO 3167.
22. The thin-walled molded article according to claim 10 , having a tensile strength of 103 to 147 MPa according to ISO 527-1,2 with a tensile test piece according to ISO 3167 and an elongation of 2.5 to 3.3% according to ISO 527-1,2 with a tensile test piece according to ISO 3167 and a tensile test piece according to ISO 3167.
23. The thin-walled molded article according to claim 11 , having a tensile strength of 103 to 147 MPa according to ISO 527-1,2 with a tensile test piece according to ISO 3167 and an elongation of 2.5 to 3.3% according to ISO 527-1,2 with a tensile test piece according to ISO 3167 and a tensile test piece according to ISO 3167.
24. The thin-walled molded article according to claim 12 , having a tensile strength of 103 to 147 MPa according to ISO 527-1,2 with a tensile test piece according to ISO 3167 and an elongation of 2.5 to 3.3% according to ISO 527-1,2 with a tensile test piece according to ISO 3167 and a tensile test piece according to ISO 3167.