IP Library › Granted Patent US 7,317,045
Granted Patent B2
US 7,317,045 · App. 11/220,741 · Granted Jan 8, 2008

Polyethylene modified asphalt compositions

View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 7,317,045
App. No.
11/220,741
Granted
Jan 8, 2008
Kind
B2
Abstract

A polymer modified bituminous composition for roofing applications that comprises polyethylene as the primary modifier.

Claims (51)

1. A modified bitumen composition for roofing application comprising:

a polymer modifier consisting essentially of polyethylene; and

asphalt, wherein the polyethylene consists of a mixture of high density polyethylene and low density polyethylene in a ratio ranging from about 4:1 to 1:4 LDPE to HDPE by weight, wherein the polyethlene is linear.

2. The composition of claim 1 , wherein the polyethylene has a weight average molecular weight between about 1,000 and 25,000.

3. The composition of claim 1 , wherein the polyethylene has a melt flow index value between about 5 and 50.

4. The composition of claim 1 , wherein the low density polyethylene has a density less than 0.95 g/cm 3 .

5. The composition of claim 1 , wherein the low density polyethylene has a density ranging less than 0.93 g/cm 3 .

6. The composition of claim 1 , wherein the low density polyethylene has a density ranging less than about about 0.915 g/cm 3 and the high density polyethylene has a melt flow index ranging from 2 to 20.

7. The composition of claim 1 , further comprising at least one plastification agent.

8. A modified bitumen composition for roofing application comprising:

a polymer modifier consisting essentially of polyethylene;

at least one plastification agent; and

asphalt,

wherein the polyethylene consists of a mixture of high density polyethylene and low density polyethylene in a ratio ranging from about 4:1 to 1:4 LDPE to HDPE by weight, and wherein said composition comprises:

a. about 1 to 20 percent by weight of polyethylene,

b. about 1 to 10 percent by weight of a plastification agent,

c. about 5 to 50 percent by weight of filler, and

d. remaining portion of asphalt.

9. The composition of claim 8 , comprising:

a. between about 5 to 15 percent by weight of polyethylene,

b. between about 3 to 6 percent by weight of plastification agents,

c. between 5 and 50 percent by weight of filler, and

d. between 40 and 70 percent by weight of asphalt.

10. The composition of claim 9 , comprising:

a. about 5 to 10 percent by weight of polyethylene,

b. about 20 to 35 percent by weight of filler,

c. about 4 to 5 percent by weight of plastification agent, and

d. about 50 to 65 percent by weight of asphalt.

11. The composition of claim 10 , comprising:

a. about 10 percent by weight of polyethylene,

b. about 4 percent by weight of plastification agent.

12. The composition of claim 1 , comprising:

a. about 5 percent by weight of low density polyethylene;

b. about 5 percent by weight of high density polyethylene.

13. The composition of claim 7 , comprising:

a. about 6 percent by weight of low density polyethylene;

b. about 1.5 percent by weight of high density polyethylene;

c. about 2.5 percent by weight of plastification agent.

14. A modified bitumen composition for roofing application comprising:

a polymer modifier consisting essentially of polyethylene;

one or more plastification agents;

and asphalt, wherein the polyethylene is linear.

15. The composition of claim 14 , wherein the polyethylene consists of a mixture of high density polyethylene and low density polyethylene in a ratio ranging from 1:4 to 4:1 LDPE to HDPE by weight.

16. The composition of claim 14 , wherein the polyethylene has a weight average molecular weight between 1,000 and 25,000.

17. The composition of claim 14 , wherein the polyethylene has a melt flow index value between 5 and 50.

18. The composition of claim 14 , wherein the low density polyethylene has a density less than 0.95 g/cm 3 .

19. The composition of claim 14 , wherein the low density polyethylene has a density less than 0.93 g/cm 3 .

20. The composition of claim 14 , wherein the low density polyethylene has a density ranging less than about about 0.915 g/cm 3 and the high density polyethylene has a melt flow index ranging from 2 to 20.

21. The composition of claim 14 , wherein the low density polyethylene has a density ranging less than 0.91 and the high density polyethylene has a melt flow index ranging from 2 to 20.

22. The composition of claim 14 , comprising:

a. about 7.5 percent by weight of polyethylene, and about 2.5 percent by weight of plastification agent.

Continuity (1)
Related Publication 20070054987A1 · Mar 8, 2007