Patent FR579284A successfully refreshed from Google Patents.
Patent US4659759A successfully refreshed from Google Patents.
US4659759A
Expired / Lapsed
US
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Bitumenous compositions
Assignee: EXXON RESEARCH COMPANY A CORP OF DE
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Filing: 1985-04-09
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Granted: 1987-04-21
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Expires: 2005-04-09
Abstract
Abstract Bitumen modified with a modifier comprising a defined elastomeric component and a polyolefin component containing polyethylene and polypropylene has improved high temperatures and low temperature properties which make it especially suitable for roofing applications. The elastomeric component is an ethylene propylene copolymer having a broad compositional distribution with regard to its ethylene content.
Inventors
- 👤 Andre Jevanoff
- 👤 Edward N. Kresge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:52
CPC Classifications
C; C08; C08L; C08L95/00; C08L23/00; C08L23/02; C08L23/16
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
113 words
A bitumenous composition which comprises bitumen and, dispersed therein in an amount sufficient to modify the bitumen to improve its low temperature and high temperature properties, a modifier comprising a polyolefin component containing polyethylene and polypropylene the ratio of polyethylene to polypropylene being about 40:60 to 60:40, and an elastomeric component, said elastomeric component consisting essentially of an ethylene-propylene copolymer having a broad compositional distribution with regard to its ethylene content, said copolymer being a copolymer having polymeric chains of ethylene content at least 5 wt % absolute greater than the average ethylene content of the copolymer, and polymeric chains of ethylene content at least 5 wt. % absolute less than said average.
Claim 2
Dependent Claim
113 words
A bitumenous composition which comprises bitumen and, dispersed therein in an amount sufficient to modify the bitumen to improve its low temperature and high temperature properties, a modifier comprising a polyolefin component containing polyethylene and polypropylene the ratio of polyethylene to polypropylene being about 40:60 to 60:40, and an elastomeric component, said elastomeric component consisting essentially of an ethylene-propylene copolymer having a broad compositional distribution with regard to its ethylene content, said copolymer being a copolymer having polymeric chains of ethylene content at least 5 wt % absolute greater than the average ethylene content of the copolymer, and polymeric chains of ethylene content at least 5 wt. % absolute less than said average.
Claim 3
Dependent Claim
38 words
A composition according to claim 1, wherein the copolymer includes polymeric chains of ethylene content from 5 to 25 wt % absolute greater than the average and from 5 to 25 wt % absolute less than said average.
Claim 4
Dependent Claim
20 words
A composition according to claim 1, wherein the copolymer has an average ethylene content of less than 53 wt %.
Claim 5
Dependent Claim
21 words
A composition according to claim 3, wherein the copolymer has an average ethylene content of from 40 to 45 wt %.
Claim 6
Dependent Claim
12 words
A composition according to claim 1, wherein the copolymer comprises EPM rubber.
Claim 7
Dependent Claim
12 words
A composition according to claim 1, wherein the copolymer comprises EPDM rubber.
Claim 8
Dependent Claim
19 words
A composition according to claim 1, wherein the polyethylene is high density polyethylene and the polypropylene is atactic polypropylene.
Claim 9
Dependent Claim
22 words
A composition according to claim 1, which comprises from 5 to 20 wt % modifier, based on the composition as a whole.
Claim 10
Dependent Claim
15 words
A composition according to claim 8, which comprises from 12 to 16 wt % modifier.
Claim 11
Dependent Claim
26 words
A composition according to claim 1 wherein the modifier comprises from 40 to 60 wt % of elastomeric component, based on the modifier as a whole.
Claim 12
Dependent Claim
74 words
A composition according to claim 1, which comprises from 12 to 16 wt % of a modifier comprising copolymer, atactic polypropylene and polyethylene in a weight ratio of 50:25:25, said copolymer having an average ethylene content of about 40 wt % and containing individual chains with ethylene contents of about 15 to 35 wt % and about 45 to 65 wt %, and from 84 to 88 wt % of a 180/220 penetration bitumen.
Claim 13
Independent Claim
146 words
A method for producing a bitumenous composition comprising bitumen and, dispersed therein in an amount sufficient to modify the bitumen to improve its low temperature and high temperature properties, a modifier comprising (1) a polyolefin component containing polyethylene and polypropylene the ratio of polyethylene to polypropylene being about 40:60 to about 60:40 and (2) an elastomeric component, said elastomeric component consisting essentially of an ethylene-propylene copolymer having a broad compositional distribution with regard to its ethylene content, said copolymer being a copolymer having polymeric chains of ethylene content at least 5 wt. % absolute greater than the average ethylene content of the copolymer, and polymeric chains of ethylene content at least 5 wt. % absolute less than said average, wherein the polyethylene, polypropylene and ethylene-propylene copolymer are blended together to form the modifier, and said modifier is then mechanically dispersed as a masterbatch in the bitumen.
Claim 14
Independent Claim
146 words
A method for producing a bitumenous composition comprising bitumen and, dispersed therein in an amount sufficient to modify the bitumen to improve its low temperature and high temperature properties, a modifier comprising (1) a polyolefin component containing polyethylene and polypropylene the ratio of polyethylene to polypropylene being about 40:60 to about 60:40 and (2) an elastomeric component, said elastomeric component consisting essentially of an ethylene-propylene copolymer having a broad compositional distribution with regard to its ethylene content, said copolymer being a copolymer having polymeric chains of ethylene content at least 5 wt. % absolute greater than the average ethylene content of the copolymer, and polymeric chains of ethylene content at least 5 wt. % absolute less than said average, wherein the polyethylene, polypropylene and ethylene-propylene copolymer are blended together to form the modifier, and said modifier is then mechanically dispersed as a masterbatch in the bitumen.
Claim 15
Dependent Claim
15 words
A bitumenous composition according to claim 1, when in the form of a roofing material.
Claim 16
Dependent Claim
17 words
A method of protecting a roof which comprises applying thereto a bitumenous composition according to claim 13.
Claim 17
Dependent Claim
98 words
The use as an additive for bitumen of a modifier composition comprising a polyolefin component comprising (1) polyethylene and polypropylene, the ratio of polyethylene to polypropylene being about 40:60 to about 60:40 and (2) an elastomeric component, wherein the elastomeric component is an ethylene-propylene copolymer having a broad compositional distribution with regard to its ethylene content said copolymer being a copolymer having polymeric chains of ethylene content at least 5 wt. % absolute greater than the average ethylene content of the copolymer, and polymeric chains of ethylene content at least 5 wt. % absolute less than said average.
Claim 18
Dependent Claim
98 words
The use as an additive for bitumen of a modifier composition comprising a polyolefin component comprising (1) polyethylene and polypropylene, the ratio of polyethylene to polypropylene being about 40:60 to about 60:40 and (2) an elastomeric component, wherein the elastomeric component is an ethylene-propylene copolymer having a broad compositional distribution with regard to its ethylene content said copolymer being a copolymer having polymeric chains of ethylene content at least 5 wt. % absolute greater than the average ethylene content of the copolymer, and polymeric chains of ethylene content at least 5 wt. % absolute less than said average.
Claim 19
Dependent Claim
19 words
A composition according to claim 12, wherein the polyethylene is high density polyethylene and the polypropylene is atactic polypropylene.
Claim 20
Dependent Claim
19 words
A composition according to claim 15, wherein the polyethylene is high density polyethylene and the polypropylene is atactic polypropylene.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-20 | 1990-10-20 | 1991-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-20 | 1994-10-20 | 1995-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-20 | 1998-10-20 | 1999-04-21 | $7700.00 | Window Closed / Lapsed |