US4237052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of bitumens modified by polymers
Assignee: Koch Enterprises Inc
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Filing: 1979-02-15
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Granted: 1980-12-02
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Expires: 1999-02-15
Abstract
Abstract A process for the preparation of bitumen-polymer compositions, characterized by the fact that the bitumens are modified by grafting of a dihalopolybutadiene polymer that serves as a receptive structure to block polymers and to elastomers co-vulcanizable with the grafted bitumen. The elastomers are selected from the group that includes linear polybutadiene-polystyrene block copolymers, a polystyrene-polybutadiene block copolymer, and a vulcanizable polynorbornene rubber. They are used as road and industrial bitumens.
Inventors
- 👤 Fredj Fitoussi
- 👤 Paul Maldonado
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:30
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/02; C10C3/026; C08; C08C; C08C19/00; C08C19/30; C08C19/32; C08L; C08L95/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
61 words
A process for the preparation of a bitumen-polymer composition comprising grafting, by heating in the presence of a catalyst, at a temperature of 180° C. for 3 hours, 5 to 10 parts of a dihalopolybutadiene polymer on to 100 parts of the bitumen, said polymer serving as a receptive structure for block polymers and to elastomers co-vulcanizable with the grafted bitumen.
Claim 2
Dependent Claim
61 words
A process for the preparation of a bitumen-polymer composition comprising grafting, by heating in the presence of a catalyst, at a temperature of 180° C. for 3 hours, 5 to 10 parts of a dihalopolybutadiene polymer on to 100 parts of the bitumen, said polymer serving as a receptive structure for block polymers and to elastomers co-vulcanizable with the grafted bitumen.
Claim 3
Dependent Claim
19 words
A process according to claim 1, wherein the dihalopolybutadiene polymer is an α,ω-dibromopolybutadiene of a molecular weight below 100,000.
Claim 4
Dependent Claim
24 words
A process according to claim 2, wherein the reaction is effected in the presence of from 0.1 to 0.8 parts zinc oxide as catalyst.
Claim 5
Dependent Claim
32 words
A process according to claims 1, 2 or 3, further comprising vulcanizing the grafted bitumen in the presence of from 0.1 to 3 parts sulfur per 100 parts bitumen modified by grafting.
Claim 6
Dependent Claim
29 words
A process according to claim 4, wherein the vulcanization is conducted in the presence of a vulcanization accelerator selected from the group consisting of a mercaptobenzothiazole and a diorthotolylguanidine.
Claim 7
Dependent Claim
21 words
A process according to claim 4, wherein the grafted bitumen is vulcanized at a temperature of from 140° to 200° C.
Claim 8
Dependent Claim
81 words
A process according to claims 1 or 3, further comprising adding to the grafted bitumen from 2 to 10 parts per 100 parts modified bitumen of a tri-block copolymer with a linear or cyclic structure of a molecular weight within the range of 100,000 and 300,000, and covulcanizing said graft bitumen and said block copolymer in the presence of from 0.1 to 3 parts sulfur per 100 parts grafted bitumen and of a vulcanization accelerator at 200° C. for 4 hours.
Claim 9
Dependent Claim
71 words
A process according to claims 1 or 3, further comprising adding to the modified bitumen from 2 to 10 parts of an elastomer having a molecular weight of 2,000,000 per 100 parts grafted bitumen and covulcanizing said modified bitumen and said elastomer in the presence of from 0.1 to 3 parts sulfur per 100 parts modified bitumen and of a vulcanization accelerator at a temperature of 200° C. for 4 hours.
Claim 10
Dependent Claim
15 words
A composition of polymeric bitumens made by the process of claims 1, 2 or 3.
Claim 11
Dependent Claim
17 words
A process according to claim 3, wherein 0.5 parts of zinc oxide is used as the catalyst.
Claim 12
Dependent Claim
21 words
A process according to claim 6, wherein the grafted bitumen is vulcanized at a temperature of from 140° to 160° C.
Claim 13
Dependent Claim
11 words
A process according to claim 8, wherein said elastomer is polynorbornene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |