US4381357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Covering, a process of producing it and the use thereof
Assignee: Gebr VON DER WETTERN A CORP OF GERMANY GmbH
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Filing: 1981-09-21
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Granted: 1983-04-26
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Expires: 2001-09-21
Abstract
Abstract A covering especially for roads consisting of mineral fillers, reclaimed rubber and a binder based on bitumen, it being possible to incorporate 5 to 30% by weight of reclaimed rubber and the binder comprising a hot-homogenized blend of bitumen and thermoplastic polymers, especially of the radial teleblock copolymer type being used. The resultant coverings are capable of reducing the annoyance caused by rolling noises etc. without the necessity of putting up with losses of other qualities.
Inventors
- 👤 Walter von der Wettern
- 👤 Harald Albrecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:53
CPC Classifications
E; E01; E01C; E01C7/00; E01C7/08; E01C7/18; E01C7/26; E01C7/265; E01C19/00; E01C19/02; E01C19/10; E01C19/1013; E01C19/104
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
44 words
A road covering comprising a mixture of mineral fillers, 5 to 30% by weight of small particles of reclaimed rubber and a binder comprising a ratio of 95-75 parts by weight of bitumen homogenized hot with 5-25 parts by weight of a thermoplastic polymer.
Claim 2
Dependent Claim
17 words
A road covering according to claim 1 in which the thermoplastic polymer is a radial teleblock copolymer.
Claim 3
Dependent Claim
16 words
A road covering according to claim 1 or 2 in which the rubber comprises ground tires.
Claim 4
Dependent Claim
16 words
A road covering according to claim 1 in which the thermoplastic polymer is a butadiene-styrene copolymer.
Claim 5
Dependent Claim
39 words
A road covering according to claim 1 in which the thermoplastic polymer is a radial teleblock copolymer of butadiene and styrene in a ratio of 75/25 to 60/40 parts by weight having a molecular weight of 50,000 to 600,000.
Claim 6
Dependent Claim
66 words
A process comprising homogenizing a ratio of 95-75 parts by weight of bitumen with 5-25 parts by weight of a thermoplastic polymer at a temperature of 180° to 220° C. in about 0.3 to 2 hours in a high speed mixer to produce a hot binder; and mixing the hot binder with small particles of reclaimed rubber and a mineral filler to produce a road covering.
Claim 7
Dependent Claim
16 words
A process according to claim 6 in which the thermoplastic polymer is a radial teleblock copolymer.
Claim 8
Dependent Claim
15 words
A process according to claim 6 or 7 in which the rubber comprises ground tires.
Claim 9
Dependent Claim
15 words
A process according to claim 6 in which the thermoplastic polymer is a butadiene-styrene copolymer.
Claim 10
Dependent Claim
38 words
A process according to claim 6 in which the thermoplastic polymer is a radial teleblock copolymer of butadiene and styrene in a ratio of 75/25 to 60/40 parts by weight having a molecular weight of 50,000 to 600,000.
Claim 11
Dependent Claim
25 words
A process according to claim 6 or 7 in which a high speed mixer means is used to homogenize the bitumen and the thermoplastic polymer.
Claim 12
Dependent Claim
26 words
A process according to claim 11 in which the high speed mixer means comprises a combination of a bitumen pump and mixer with a rotor-stator system.
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) | 1986-04-25 | 1986-10-25 | 1987-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-25 | 1990-10-25 | 1991-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-25 | 1994-10-25 | 1995-04-26 | $7700.00 | Window Closed / Lapsed |