Graphite filled polyester compositions
View Patent ↗Polyester compositions comprising: 3 to 40 weight percent, preferably 3 to 30 weight percent, of at least one polyester, preferably polybutylene terephthalate, polytrimethylene terephthalate, polyethylene terephthalate, poly(ethylene 2,6-naphthoate), and poly(1,4-cyclohexyldimethylene terephthalate); 25 to 50 weight percent non-fibrous graphite, preferably a platy or particulate graphite; 10 to 40 weight percent inorganic filler selected from the group consisting of wollastonite, glass fibers, aramid fibers, ceramic fibers, potassium titanate whiskers, or combinations of them; 3 to 10 weight percent copolyether ester elastomer; wherein: the amount of a+b+c+d is 100 weight percent of the composition; the amount of b+c is at least 50 weight percent of the composition; the weight ratio of copolyether ester elastomer to polyester is from 0.3 to 0.4; and the composition has at least a 0.2 percent elongation, a thermal conductivity of at least 3 WmK, and a tensile strength of at least 25 MPa. Articles prepared from these compositions.
1. A polyester composition comprising:
a) 3 to 40 weight percent of at least one polyester selected from the group consisting of polybutylene terephthalate, polytrimethylene terephthalate, polyethylene terephthalate, poly(ethylene 2,6-naphthoate), poly(1,4-cyclohexyldimethylene terephthalate), and combinations thereof;
b) 25 to 50 weight percent of a platy or of a particulate non-fibrous graphite having an aspect ratio of less than 2;
c) 10 to 40 weight percent of a inorganic filler having an aspect ratio of at least 2 selected from the group consisting of glass fibers, aramid fibers, ceramic fibers, potassium titanate fibers, and combinations thereof;
d) 3 to 10 weight percent of a copolyether ester elastomer;
wherein:
the amount of a+b+c+d is 100 weight percent of the polyester composition;
the amount of b+c is at least 50 weight percent of the polyester composition
the weight ratio of the copolyether ester elastomer to the polyester is from 0.3 to 0.4; and
the polyester composition has at least a 0.2 percent elongation, a thermal conductivity of at least 3 WmK, and a tensile strength of at least 25 MPa.
2. The polyester composition of claim 1 , wherein the amount of the inorganic filler is from 15 to 30 weight percent of the polyester composition.
3. The polyester composition of claim 1 , wherein the amount of the platy or the particulate non-fibrous graphite is from 32 to 42 weight percent of the polyester composition, the amount of the copolyether ester elastomer is from 5 to 10 weight percent of the composition, and the amount of the inorganic filler is from 15 to 30 weight percent of the polyester composition.
4. The polyester composition of claim 1 , wherein the amount of the platy or the particulate non-fibrous graphite is from 32 to 42 weight percent of the polyester composition.
5. The polyester composition of claim 4 , wherein the amount of the copolyether ester elastomer is from 5 to 10 weight percent of the polyester composition.
6. The polyester composition of claim 4 , wherein the amount of the inorganic filler is from 15 to 30 weight percent of the polyester composition.
7. The polyester composition of claim 1 , wherein the amount of the copolyether ester elastomer is from 5 to 10 weight percent of the polyester composition.
8. The polyester composition of claim 7 , wherein the amount of the platy or the particulate non-fibrous graphite is from 32 to 42 weight percent of the polyester composition.
9. A light emitting diode housing comprising at least one component comprising the polyester composition of claim 1 .
10. The light emitting diode housing of claim 9 , wherein the amount of the platy or the particulate non-fibrous graphite is from 32 to 42 weight percent of the polyester composition.
11. The light emitting diode housing of claim 9 , wherein the amount of the copolyether ester elastomer is from 5 to 10 weight percent of the polyester composition.
12. The light emitting diode housing of claim 9 , wherein the amount of the inorganic filler is from 15 to 30 weight percent of the polyester composition.
13. The light emitting diode housing of claim 9 , wherein the amount of non-fibrous graphite is from 32 to 42 weight percent of the polyester composition and the amount of copolyether ester elastomer is from 5 to 10 weight percent of the polyester composition.
14. The light emitting diode housing of claim 9 , wherein the amount of non-fibrous graphite is from 32 to 42 weight percent of the polyester composition; the amount of the copolyether ester elastomer is from 5 to 10 weight percent of the composition; and the amount of the inorganic filler is from 15 to 30 weight percent of the polyester composition.