Modified polypropylene resins
View Patent ↗The present invention relates to polypropylene resin compositions comprising a syndiotactic polypropylene incorporating at least one particulate material or chemical additive.
1. A polymer composition comprising:
A polymer component consisting essentially of:
a first polymer, wherein the first polymer is a crystalline polymer selected from polypropylene resins prepared with a Ziegler-Natta catalyst, polypropylene resins prepared with a metallocene catalyst, polyethylene resins and combinations thereof; and
at least 20 wt. % of a second polymer, wherein the second polymer comprises a syndiotactic propylene polymer incorporating at least one filler additive, the filler additive selected from particulate material, chemical additives and combinations thereof; and
wherein the polymer composition has a characteristic of at least one of flexibility and impact resistance which is higher than the corresponding characteristic exhibited by the first polymer incorporating the filler additive without the presence of the second polymer.
2. The polymer composition of claim 1 , wherein said first polymer comprises a metallocene-produced polyethylene or a linear low-density polyethylene.
3. The polymer composition of claim 2 wherein said first polymer is a linear low density polypropylene.
4. The polymer composition of claim 1 , wherein said first polymer component comprises a polypropylene prepared with a Ziegler-Natta catalyst or prepared with a metallocene catalyst.
5. The polymer composition of claim 1 , wherein said syndiotactic propylene polymer has a racemic pentad content of at least 70%.
6. The polymer composition of claim 5 wherein said syndiotactic propylene polymer has a bimodal molecular weight distribution.
7. The polymer composition of claim 1 , wherein said filler additive is a particulate material.
8. The polymer composition of claim 7 wherein said particulate material is selected from the group consisting of glass fibers, carbon fibers, alumina particles, calcium carbonate particles, carbon black particles, silicon particles, graphite particles and mixtures thereof.
9. The polymer composition of claim 7 wherein said particulate material comprises electrically conductive particles in a concentration at least as great as the percolation threshold for electrical conductivity.
10. The polymer composition of claim 7 wherein said particulate material comprises heat conductive particles in a concentration at least as great as the percolated threshold for thermal conductivity.
11. The polymer composition of claim 7 wherein said particulate material is an anti-microbial additive.
12. The polymer composition of claim 7 wherein said particulate material is a flame retardant additive.
13. The polymer composition of claim 7 wherein said particulate material is an anti-static additive.
14. The polymer composition of claim 7 wherein said particulate material is an anti-UV additive.
15. The polymer composition of claim 7 wherein said particulate material is a weight additive having a density greater than the density of said polymer composition.
16. The polymer composition of claim 7 wherein the particulate material is an anti-algae additive.
17. The polymer composition of claim 7 wherein the particulate material is a carbon black additive.
18. The polymer composition of claim 7 wherein the particulate material is a carbon fiber additive.
19. The polymer composition of claim 7 wherein the particulate material is a mineral filler.
20. The polymer composition of claim 7 wherein the particulate material is a fungicide.