Polybutylene terephthalate composition and radar device component thereof
The invention discloses a polybutylene terephthalate composition comprising as component (A) polybutylene terephthalate resin in an amount of from 40 wt % to 90 wt %, as component (B) glass fiber having low dielectric constant and dissipation factor measured according to GB 9534-88 in an amount of 10 wt % to 60 wt %. The invention also disclosed a radar device component containing the polybutylene terephthalate composition.
1 . A radar device component containing a polybutylene terephthalate composition, comprising:
as component (A) a polybutylene terephthalate resin in an amount of from 40 wt % to 90 wt %, and
as component (B) a glass fiber having dielectric constant (Dk) of equal to or less than 4.6 and dissipation factor (Df) of less than 0.004 at a frequency from 1 GHz to 78 GHz, and Dk of equal to or less than 4.2 and Df of 0.001 to 0.0035 at a frequency of 79 GHz to 85 GHz, the dielectric constant Dk and dissipation factor Df of the glass fiber is measured according to GB 9534-88 in an amount of 10 wt % to 60 wt %.
2 . The radar device component according to claim 1 , wherein the glass fiber (B) has dielectric constant of 4.4-4,6, and dissipation factor of 0.002-0.003 at a frequency from 1 GHz to 78 GHz, and dielectric constant of 3.5-4.2 and dissipation factor of 0.001-0.0015 at a frequency of 79 GHz to 85 GHz.
3 . The radar device component according to claim 1 , wherein the composition further comprises as component (C) a secondary polymer selected from the group consisting of polyolefin, cyclic olefin copolymer, and poly (arylene ether).
4 . The radar device component according to claim 3 , wherein
the component (C) is polypropylene in an amount of 25 wt % to 35 wt % or 5 wt % to 15 wt % based on a total weight of polybutylene terephthalate composition; or
the component (C) is polyethylene in an amount of 5 wt % to 35 wt % based on
a total weight of-high-density polyethylene based on the total weight of polybutylene terephthalate composition; or
the component (C) is low density polyethylene in an amount of 25 wt % to 35 wt % based on the total weight of polybutylene terephthalate composition; or
the component (C) is cyclic olefin copolymer in an amount of 25 wt % to 35 wt %, based on the total weight of polybutylene terephthalate composition; or
the component (C) is poly (arylene ether) in an amount of 10 wt % to 30 wt %, based on the total weight of polybutylene terephthalate composition; or
the component (C) is a mixture of at least two components (C) in a total amount of 5 wt % to 35 wt %, based on the total weight of polybutylene terephthalate composition.
5 . The radar device component according to claim 3 , wherein the cyclic olefin copolymer comprises cyclic olefin units and acyclic olefin units in a mole ratio of 6:4 to 9:1; the cyclic olefin units are derived from cyclic olefin monomers selected from the group consisting of cyclopentene-based olefins, norbornene-based olefins, tetracyclododecene-based olefins, dicyclopentadiene-based olefins, and derivatives thereof; the acyclic olefins units are derived from acyclic olefin monomers selected from the group consisting of branched and unbranched olefins having from 2 to 20 carbon atoms.
6 . The radar device component according to claim 3 , wherein the poly (arylene ether) is poly(2,6-dimethyl-1,4-phenylene ether), poly(2-methyl-6-ethyl-1,4-phenylene ether), poly(2-methyl-6-phenyl-1,4-phenylene ether), poly(2,3,6-trimethyl-1,4-phenylene ether), poly(2,6-dichloro-1,4-phenylene ether), poly(2,6-dimethylphenol-1,4-phenylene ether), or poly(2,3,6-trimethylphenol-1,4-phenylene ether).
7 . The radar device component according to claim 1 , wherein the glass fibers (B) have a dielectric constant of 4.4-4.6, and a dissipation factor (Df) of 0.002-0.003 at a frequency from 1 GHz to 78 GHz, and Dk is 3.5-4.2 and Df is 0.001-0.0015 at a frequency of 79 GHz to 85 GHz, the dielectric constant Dk and dissipation factor Df of glass fibers is measured according to GB 9534-88.
8 . The radar device component according to claim 1 , wherein the composition further comprises as component (D) an impact modifier in an amount of 5 wt % to 15 wt %, based on a total weight of polybutylene terephthalate composition.
9 . The radar device component according to claim 8 , wherein the impact modifier is derived from at least one of alpha-olefin and/or diene, and at least one of ethylenically unsaturated carboxylic acid and epoxy compound, ester and acid anhydride thereof.
10 . The radar device component according to claim 1 , wherein the radar device component is radome, housing, automobile antenna spilt or base station antenna screw.
11 . A polybutylene terephthalate composition, comprising:
as component (A) a polybutylene terephthalate resin in an amount of from 40 wt % to 90 wt %,
as component (B) a glass fiber having dielectric constant (Dk) of equal to or less than 4.6 and dissipation factor (Df) of less than 0.004 at a frequency from 1 GHz to 78 GHz, and Dk of equal to or less than 4.2 and Df of 0.001 to 0.0035 at a frequency of 79 GHz to 85 GHZ, the dielectric constant Dk and dissipation factor Df of glass fibers is measured according to GB 9534-88 in an amount of 10 wt % to 60 wt %.
12 . An article produced from the polybutylene terephthalate composition according to claim 11 .
13 . A process for preparing the polybutylene terephthalate composition according to claim 11 , comprising:
(1) mixing the polybutylene terephthalate resin (A), optionally a secondary polymer (C), optionally an impact modifier (D) and optionally additives (F), and
(2) adding the glass fiber (B), and extruding or kneading.
14 . The radar device component according to claim 1 , wherein said component comprises a laser weld.