Polybutylene terephthalate resin composition exhibiting an improved glow-wire ignition temperature for insulating parts
View Patent ↗Provided is a polybutylene terephthalate resin composition for insulating parts, which satisfies GWIT Standard over a thickness range of 0.75 to 3 mm, the thickness range having been accepted as difficult to satisfy the Standard. In detail, to (A) 100 parts by weight of a polybutylene terephthalate resin, there are added (B) 5 to 50 parts by weight of a halogen-based flame retardant, (C) 5 to 50 parts by weight of a flame retardant assistant, (D) 1 to 100 parts by weight of a nitrogen-based compound, and (E) 0 to 200 parts by weight of a fibrous reinforcement.
1. A polybutylene terephthalate resin composition for insulating parts which exhibits an improved glow-wire ignition temperature which satisfies the requirement of a 775° C. or higher glow-wire ignition temperature specified by IEC60695-2-13 at each of the test piece thicknesses of 0.75 mm, 1.5 mm and 3 mm combined with a V—O flame retardancy pursuant to the UL-94 standard, consisting essentially of: (A) 100 parts by weight of a polybutylene terephthalate resin; (B) 15 to 40 parts by weight of polypentabromobenzylacrylate flame retardant; (C) 5 to 50 parts by weight of antimony trioxide; (D) 35 to 63 parts by weight of melamine cyanurate; and (E) 30 to 100 parts by weight of glass fibrous reinforcement having a diameter of 3 to 30 μm and a length of 0.1 to 20 mm, and wherein said composition does not comprise polyethylene terepthalate, or a phosphinic acid or salt thereof.
2. An insulated part wherein the insulating material consists essentially of a polybutylene terephthalate resin composition that exhibits an improved glow-wire ignition temperature which satisfies the requirement of a 775° C. or higher glow-wire ignition temperature specified by IEC60695-2-13 at each of the test piece thicknesses of 0.75 mm, 1.5 mm and 3 mm combined with a V—O flame retardancy pursuant to the UL-94 standard, and consists essentially of: (A) 100 parts by weight of a polybutylene terephthalate resin; (B) 15 to 40 parts by weight of polypentabromobenzylacrylate flame retardant; (C) 5 to 50 parts by weight of antimony trioxide; (D) 35 to 63 parts by weight of melamine cyanurate; and (E) 30 to 100 parts by weight of a glass fibrous reinforcement having a diameter of 3 to 30 μm and a length of 0.1 to 20 mm, and wherein said composition does not comprise polyethylene terephthalate, or a phosphinic acid or salt thereof.
3. The polybutylene terephthalate resin composition according to claim 1 wherein said polybutylene terephthalate (A) has an intrinsic viscosity of 0.65 to 0.9 g/dl determined at 25° C.
4. The polybutylene terephthalate resin composition according to claim 1 wherein said polybutylene terephthalate (A) has an intrinsic viscosity of 0.7 g/dl determined at 25° C.
5. The polybutylene terephthalate resin composition according to claim 1 wherein said antimony trioxide (C) is present in a concentration of 10 to 40 parts by weight.
6. The polybutylene terephthalate resin composition according to claim 1 wherein said antimony trioxide (C) is present in a concentration of 15 to 30 parts by weight.
7. The polybutylene terephthalate resin composition according to claim 1 wherein the glass fibrous reinforcement is present in a concentration of 79 to 94 parts by weight.
8. The polybutylene terephthalate resin composition according to claim 1 wherein said glass fibrous reinforcement (E) is glass fiber having a diameter of 10 μm.
9. An insulated part wherein the insulating material consists essentially of the polybutylene terephthalate resin composition according to claim 3 .
10. An insulated part wherein the insulating material consists essentially of the polybutylene terephthalate resin composition according to claim 4 .
11. An insulated part wherein the insulating material consists essentially of the polybutylene terephthalate resin composition according to claim 5 .
12. An insulated part wherein the insulating material consists essentially of the polybutylene terephthalate resin composition according to claim 6 .
13. An insulated part wherein the insulating material consists essentially of the polybutylene terephthalate resin composition according to claim 7 .
14. An insulated part wherein the insulating material consists essentially of the polybutylene terephthalate resin composition according to claim 8 .