Thermoplastic fiber concentrate methods and articles
View Patent ↗A feedstock concentrate material, including a first phase including fibers having a length greater than 5 mm; and a polymeric phase including a first polyolefin having a first melt flow rate; and a second polyolefin having a second melt flow rate. Kits, methods of using and resulting articles including the concentrate are also disclosed.
1. A feedstock concentrate material, comprising:
a fibrous phase including greater than 20 percent by weight of glass fibers based on the total weight of the concentrate material, wherein the glass fibers are aligned generally axially with each other; and
a polymeric phase including
i) at least 50 percent by weight of the polymeric components of the polymeric phase of a first polypropylene having a first melt flow rate;
ii) a second polypropylene having a second melt flow rate that is higher than the first melt flow rate; and
iii) a maleic anhydride grafted polypropylene coupling agent;
wherein the first polypropylene, the second polypropylene, and the coupling agent are all present in the feedstock concentrate material; the coupling agent is different from the first polypropylene and the second polypropylene; and the feedstock concentrate material is produced by a pultrusion process and is in the form of pellets, rods, or granules.
2. The feedstock concentrate material of claim 1 , wherein the first polypropylene has a melt flow rate of less than about 120 g/10 min, as measured per ISO 1133 at 230° C./2.16 kg, and first polypropylene and the second polypropylene are free of modified polymers.
3. The feedstock concentrate material of claim 2 , wherein the second polypropylene is present at a concentration between 10 and 25 percent by weight, based on the total weight of the polymers in the polymeric phase, the maleic anhydride grafted polypropylene coupling agent is present at 0.5 to 5 weight percent based on the total weight of the feedstock concentrate material.
4. The feedstock concentrate material of claim 1 , wherein the second polypropylene has a melt flow rate greater than about 220 g/10 min, as measured per ISO 1133 at 230° C./2.16 kg.
5. The feedstock concentrate material of claim 4 , wherein the first polypropylene is present from about 3 to about 9 parts by weight per 1 part by weight of the second polypropylene, the maleic anhydride grafted polypropylene coupling agent is present at 0.5 to 5 weight percent based on the weight of the feedstock concentrate material, and the glass, fibers are present at a concentration greater than 50 percent by weight, so that the first polypropylene has a concentration of less than 89 percent by weight, based on the total weight of the polymers in the polymeric phase.
6. The feedstock concentrate material of claim 5 , wherein the fibers in the first phase are present in an amount of 50 to 70 percent by weight based on the total weight of the feedstock concentrate material, so that the concentration of the first polypropylene is less than 50 percent by weight, based on the total weight of the feedstock concentrate material.
7. The feedstock concentrate material of claim 4 , wherein the first polypropylene has a melt flow rate of less than about 60 g/10 min, as measured per ISO 1133 at 230° C./2.16 kg.
8. The feedstock concentrate material of claim 7 , wherein the first polyolefin is present from about 3 to about 9 parts by weight per 1 part by weight of the second polypropylene, so that the first polypropylene has a concentration of less than 72 percent by weight, based on the total weight of the feedstock concentrate material, and less than 90 percent based on the total weight of the polymers of the polymeric phase.
9. The feedstock concentrate material of claim 4 , wherein the second polypropylene has a melt flow rate greater than 300 g/10 min, as measured per ISO 1133 at 230° C./2.16 kg.
10. A polymeric article comprising a diluent polymer having a melt flow rate of less than about 150 g/10 minutes, as measured per ISO 1133 at 230° C./2.16 kg blended with the feedstock concentrate material of claim 1 .
11. The polymeric article of claim 10 , wherein the second polyolefin is a polypropylene having a melt flow rate greater than about 220 g/10 min, as measured per ISO 1133 at 230° C./2.16 kg.
12. The polymeric article of claim 11 , wherein the material of the article exhibits one or any combination of the following properties:
a) a charpy edge unnotched impact of at least about 10 KJ/m 2 at room temperature, as measured per ISO 179/1eu;
b) a charpy flatwise RT unnotched impact of at least about 10 KJ/m 2 at room temperature, as measured per ISO 179/1FU;
c) a tensile strength at yield of at least about 20 MPa, as measured per ISO 527-2 at a rate of 50 mm/min;
d) a tensile elongation at rupture of at least about 1%, as measured per ISO 527-2 at a rate of 50 mm/min;
e) a tensile modulus of at least about 1300 MPa, as measured per ISO 527-2 at a rate of 50 mm/min;
f) a flexural strength of at least about 30 MPa, as measured per ISO 178; or
g) a flexural modulus of at least about 1300 MPa, as measured per ISO 178.
13. The polymeric article of claim 11 , wherein the first polyolefin is present from about 3 to about 9 parts by weight per 1 part by weight of the second polyolefin.
14. A method for making an article of claim 10 comprising the steps of blending the feedstock concentrate material with the diluent polymer, introducing the resulting blend in a molten state into a mold cavity and solidifying the molten blend to form a solidified article, wherein the step of introducing includes injection molding the blend.
15. The method of claim 14 , wherein the first polyolefin is present from about 3 to about 9 parts by weight per 1 part by weight of the second polyolefin.
16. The feedstock concentrate material of claim 1 , wherein the second polypropylene is present at a concentration of 10 to 25 percent by weight based on the total weight of the polymers of the polymeric phase, and the composition includes a sizing agent wherein the sizing agent is a silane.
17. A feedstock concentrate material, comprising:
a fibrous phase including greater than 50 percent by weight of glass fibers based on the total weight of the concentrate material, wherein the glass fibers are aligned generally axially with each other; and a polymeric phase including
i) a first polypropylene having a first melt flow rate,
ii) a second polypropylene, wherein the second polypropylene has a second melt flow rate that is higher than the first melt flow rate;
iii) from 0.5 weight percent to 5 weight percent of a maleic anhydride grafted polypropylene coupling agent, based on the total weight of the feedstock concentrate material;
wherein the maleic anhydride grafted polypropylene coupling agent is present 0.5 weight percent to 5 weight percent of the feedstock concentrate material, and first polypropylene is present from 3 to 9 parts by weight per 1 part by weight of the second polyolefin, so that the concentration of the first polypropylene is less than 89 percent by weight, based on the total weight of the polymers in the polymeric phase;
wherein the first polyolefin, the second polyolefin, and the coupling agent are all present in the feedstock concentrate material; the coupling agent is different from the first polyolefin and the second polyolefin; and the feedstock concentrate material is produced by a pultrusion process and is in the form of pellets, rods, or granules.
18. A feedstock concentrate material, comprising:
a fibrous phase including greater than 20 percent by weight of glass fibers based on the total weight of the concentrate material, wherein the glass fibers are aligned generally axially with each other; and a polymeric phase including
i) at least 50 percent by weight of the polymeric components of the polymeric phase of a first polyolefin having a first melt flow rate, wherein the first polyolefin includes a polypropylene;
ii) a second polyolefin having a second melt flow rate that is higher than the first melt flow rate, wherein the second polyolefin is a polypropylene; wherein the first polyolefin and the second polyolefin are free of modified polymer; and
iii) a maleic anhydride grafted polypropylene coupling agent, wherein the first polyolefin, the second polyolefin, and the coupling agent are all present in the feedstock concentrate material; the coupling agent is different from the first polyolefin and the second polyolefin; and the feedstock concentrate material is produced by a pultrusion process and is in the form of pellets, rods, or granules.
19. The feedstock concentrate material of claim 18 , wherein the first polyolefin is present from about 3 to about 9 parts by weight per 1 part by weight of the second polyolefin, and the concentration of the second polyolefin is 10 to 25 percent by weight based on the total weight of the polymers of the polymeric phase.
20. The feedstock concentrate material of claim 19 , wherein the first polyolefin has a melt flow rate of less than about 60 g/10 min, as measured per ISO 1133 at 230° C./2.16 kg.