Weatherable glass fiber reinforced polyolefin composition

1. A composition comprising:

a. about 40 wt % to about 90 wt % of a polypropylene homopolymer,

b. about 10 wt % to about 50 wt % of a polypropylene copolymer,

c. about 10 wt % to about 40 wt % of a fibrous reinforcer,

d. about 0.1 wt % to about 2 wt % of a hindered amine light stabilizer having a molecular weight from about 100 to 1000,

e. about 0.1 wt % to about 2 wt % of a hindered amine light stabilizer having a molecular weight of greater than 1000 to about 5000,

f. about 0.05 wt % to about 0.8 wt % of antioxidants,

g. about 0.01 wt % to about 1 wt % of a lubricant package,

h. about 0.1 wt % to about 3 wt % of a maleic anhydride copolymer,

i. about 0.1 wt % to about 0.3 wt % of a pigment selected from the group consisting of ZnO, ZnS, and surface treated anatase TiO 2 .

2. The composition of claim 1 wherein the surface treated anatase TiO 2 comprises anatase TiO 2 , aluminum, silicon, manganese, and at least one organic compound.

3. The composition of claim 1 wherein the surface treated anatase TiO 2 comprises anatase TiO 2 , and at least one composition selected from the group consisting of organoaluminum, organosilicon and organomanganese.

4. The composition of claim 1 wherein the antioxidants comprise:

a. about 0.025 wt % to about 0.2 wt % of a primary phenolic antioxidant, and

b. about 0.2 wt % to about 0.6 wt % of a secondary phenolic antioxidant.

5. The composition of claim 1 comprising about 50 wt % to about 80 wt % of polypropylene homopolymer and about 15 wt % to about 35 wt % of polypropylene copolymer.

6. The composition of claim 1 wherein the lubricant package comprises at least one selected from the group consisting of:

a. about 0.01 wt % to about 0.1 wt % zinc stearate,

b. about 0.01 wt % to about 0.025 wt % zinc dibutyldithiocarbamate, and

c. about 0.01 wt % to about 0.3 wt % calcium stearate, and combinations thereof.

7. The composition of claim 1 wherein the glass fibers have an average length of 0.1 to 25 mm.

8. The composition of claim 1 wherein the glass fibers have an aspect ratio of about 10 to about 500.

9. The composition of claim 1 wherein the polypropylene copolymer further comprises monomer units selected from the group consisting of ethylene, butene, hexane, and octane.

10. The composition of claim 1 , comprising:

a. about 50 wt % to about 80 wt % of a polypropylene homopolymer,

b. about 15 wt % to about 35 wt % of a polypropylene copolymer,

c. about 10 wt % to about 40 wt % of glass fiber,

d. about 0.2 wt % to about 1 wt % of a hindered amine light stabilizer having a molecular weight from about 100 to 1000,

e. about 0.2 wt % to about 1 wt % of a hindered amine light stabilizer having a molecular weight of greater than 1000 to about 5000,

f. about 0.025 wt % to about 0.02 wt % of a primary phenolic antioxidant,

g. about 0.2 wt % to about 0.6 wt % of a secondary phenolic antioxidant,

h. about 0.01 wt % to about 0.1 wt % zinc stearate,

i. about 0.01 wt % to about 0.025 wt % zinc dibutyldithiocarbamate,

j. about 0.01 wt % to about 0.3 wt % calcium stearate,

k. about 0.2 wt % to about 2 wt % maleic anhydride grafted polypropylene, and

l. about 0.1 wt % to about 0.3 wt % surface treated anatase titanium dioxide.

11. The composition of claim 1 , comprising:

a. about 50 wt % to about 60 wt % of a polypropylene homopolymer,

b. about 20 wt % to about 30 wt % of a polypropylene copolymer,

c. about 15 wt % to about 25 wt % of a fibrous reinforcer,

d. about 0.1 wt % to about 0.3 wt % of a hindered amine light stabilizer having a molecular weight from about 100 to 1000,

e. about 0.1 wt % to about 0.3 wt % of a hindered amine light stabilizer having a molecular weight of greater than 1000 to about 5000,

f. about 0.025 wt % to about 0.02 wt % of a primary phenolic antioxidant,

g. about 0.2 wt % to about 0.6 wt % of a secondary phenolic antioxidant,

h. about 0.01 wt % to about 0.1 wt % zinc stearate,

i. about 0.01 wt % to about 0.025 wt % zinc dibutyldithiocarbamate,

j. about 0.01 wt % to about 0.3 wt % calcium stearate,

k. about 0.5 wt % to about 1 wt % maleic anhydride grafted polypropylene, and

l. about 0.1 wt % to about 0.3 wt % surface treated anatase titanium dioxide.

12. An article of manufacture comprising the composition of claim 1 .

13. The article of claim 12 having a tensile strength of at least 8000 psi.

14. The article of claim 12 having a ΔE value (CIE L*a*b) of <2 units after exposure to a xenon arc lamp in accordance with ASTM D 2565 for one week.

15. The article of claim 12 having a ΔE value (CIE L*a*b) of <4 units after exposure to a xenon arc lamp in accordance with ASTM D 2565 for four weeks.

16. The composition of claim 1 wherein the pigment is surface treated anatase TiO 2 .

17. The composition of claim 16 wherein the surface treated anatase TiO 2 comprises anatase TiO 2 , aluminum, silicon, manganese, and at least one organic compound.

18. The composition of claim 16 wherein the surface treated anatase TiO 2 comprises anatase TiO 2 , and at least one composition selected from the group consisting of organoaluminum, organosilicon and organomanganese.

19. A composition comprising:

j. about 40 wt % to about 90 wt % of a polypropylene homopolymer,

k. about 10 wt % to about 50 wt % of a polypropylene copolymer,

l. about 10 wt % to about 40 wt % of a fibrous reinforcer,

m. about 0.1 wt % to about 2 wt % of a hindered amine light stabilizer having a molecular weight from about 100 to 1000,

n. about 0.1 wt % to about 2 wt % of a hindered amine light stabilizer having a molecular weight of greater than 1000 to about 5000,

o. about 0.05 wt % to about 0.8 wt % of antioxidants,

p. about 0.01 wt % to about 1 wt % of a lubricant package,

q. about 0.1 wt % to about 3 wt % of a maleic anhydride copolymer,

r. about 0.1 wt % to about 5 wt % of at least two pigments selected from the group consisting of ZnO, ZnS, and surface treated anatase TiO 2 .