CA1052057A - Asphalt composition, particularly for obtaining asphalt road surfaces, and method of producing this composition - Google Patents
Asphalt composition, particularly for obtaining asphalt road surfaces, and method of producing this compositionInfo
- Publication number
- CA1052057A CA1052057A CA243,780A CA243780A CA1052057A CA 1052057 A CA1052057 A CA 1052057A CA 243780 A CA243780 A CA 243780A CA 1052057 A CA1052057 A CA 1052057A
- Authority
- CA
- Canada
- Prior art keywords
- rubber
- asphalt
- modifier
- residues
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
- C10C3/00—Working-up pitch, asphalt, bitumen
- C10C3/02—Working-up pitch, asphalt, bitumen by chemical means reaction
- C10C3/026—Working-up pitch, asphalt, bitumen by chemical means reaction with organic compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Polymers & Plastics (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Processing Of Solid Wastes (AREA)
- Road Paving Structures (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Paints Or Removers (AREA)
- Working-Up Tar And Pitch (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Asphalt composition suitable for road surfaces comprising an asphaltic basis material and a modifier, the modifier comprising from 1 - 50%
by weight of rubber thermal degradation products in a medium chosen from petroleum asphalts, mineral oil selective refining residues, kerosene heavy residues, or coal tar oil residues, the degradation of the rubber being effected by heating it at a temperature of from 240 - 380°C in the chosen medium. These modified asphalts in addition to exhibiting the known good tyre adhesion and load resistance of rubberized asphalts, also exhibit better thermoplastic characteristics and improved adhesion to the substrate on which it is laid, for example road bed aggregate.
Asphalt composition suitable for road surfaces comprising an asphaltic basis material and a modifier, the modifier comprising from 1 - 50%
by weight of rubber thermal degradation products in a medium chosen from petroleum asphalts, mineral oil selective refining residues, kerosene heavy residues, or coal tar oil residues, the degradation of the rubber being effected by heating it at a temperature of from 240 - 380°C in the chosen medium. These modified asphalts in addition to exhibiting the known good tyre adhesion and load resistance of rubberized asphalts, also exhibit better thermoplastic characteristics and improved adhesion to the substrate on which it is laid, for example road bed aggregate.
Description
This invention is concerned with asphalt compositions, particularly for use in asphalt road surfaces.
In principle theory, in road asphalt production technology no modi-fying additions are needed, due to the thick dressing of asphalt used and the costs connected with modifying it. In fact, methods of improving road surfaces by adding to the asphalt non-vulcanized natural and synthetic rubbers in a quantity of up to 5% by weight, are known and widely used. The addition of reclaimed rubber [obtained by heating rubber scraps to a temperature of 180 under a pressure of 5 atm in the presence of peptizing agents and plasticizers]
has also been used. These additions improved both the durability of the asphalt surface, and its adhesion or stability; i.e., deformation resistance at great load, freeze resistance, grindability, adhesion to the aggregates etc. mese properties have been exhibited in a somewhat smaller degree by asphalt having a rubber dust addition.
Known asphalts modified with the aid of additions of rubber origin are expensive due to the high costs of the employed raw materials. In case of rubbers, and reclaimed rubber, the procedure of reducing the vulcanized rubber scraps to the required size of about 0,1 mm is troublesome and expensive.
This invention seeks to provide an improved asphalt containing rubber materials. Thus in a broad aspect this invention provides an asphalt composition suitable for road surfaces comprising an asphaltic basis material and a modifier, the modifier comprising from 1-50% by weight of rubber thermal degradation products in a medium chosen from petroleum asphalts, mineral oil selective refining residues, kerosene heavy residues, or coal tar oil residues, ; the degradation of the rubber being effected by heating it at a temperature of from 240-380 C in the chosen medium.
The modifying component used in the asphalt of this invention is obtained by heating rubber scraps, such as spent tires, inner tubes, and in-dustrial waste, in petroleum asphalt, the extract remaining after refining of . -1- ~
~ .~
, 105;~05~
oils with the aid of selective solvents, or heavy products of coal tar dis-tillation at a temperature of 240-380 C.
According to a preferred embodiment of the invention, rubber scraps in a quantity of 1-50% by weight, are introduced into distillation asphalt, oxidized asphalt propane refined asphalt, and or natural asphalt one, and heated at a temperature of 220-360 C to cause liquefaction of the mixture.
In order to elevate the softening point and lower the penetration, the obtained asphalt containing the rubber scrap can be oxidized with the aid of air at a temperature of 200-320&, or subjected to distillation either at a lowered `
pressure or with steam.
The rubber scraps can be subjected to destruction by introducing ` them into the asphalt during the oxidation, or during the distillation process.
According to another method the modifying component is obtained by heating the rubber scraps at a temperature of 240-380 C in the presence of petroleum asphalt, extracts remaining after selective refining of mineral oils, heavy products from destructive processing of kerosene products, or heavy coal ; tar products, the heated mixture containing from 1 to 80% by weight of rubber scraps. The mixture obtained is introduced into petroleum asphalt, or natural asphalt, in such a quantity that the content of processed rubber scraps in the finished asphalt preferably amountsto 1-50% by weight.
The modified asphalt can be subjected to an oxidation process by means of air at a temperature of 220-320 C, or to distillation at decreased pressure, or to distillation with steam, in order to obtain the desired prop-erties. It is also possible to separate the low-boiling components from the modifying component by subjecting it to distillation at reduced pressure, or to steam distillation. The distillation of rubber scrap containing products makes it possible to remove the low-boiling disagreeable-smelling components of the rubber scrap and to obtain a finished asphalt exhibiting a higher ignition temperature and a higher thermal stability.
.
l~S~057 The road asphalt obtained according to the invention methods has good performance characteristics, especially thermoplastic ones. Asphalt surfaces obtained by the use of asphalts modified with rubber scrap also have good adhesion to tires and high loading resistance.
Example I
53 kg of asphalt residue containing 3,2% by weight of paraffin are oxidized by means of air to a penetration at a temperature of 25 C equal to 36. 50 kg of the obtained oxidized asphalt are mixed at a temperature of 380 C with 50 kg of granulated spent tires over 40 minutes, with simultaneous 10 blowing with superheated steam. The obtained mixture is distilled at a pressure of lS mm of mercury and asphalt exhibiting the following properties is obtained:
- softening point according to the ring and ball method .... 61 C
-penetration at 25 C, the loading being 100 g for 5 sec .. 24mm/10 -brittle point.............................................. -7 C
-ductility at 15C.......................................... 8 cm Example II
90 kg of distillation asphalt showing a penetration of 101 mm/10 at a temperature of 25C,is heated to a temperature of 280C, and 10 kg of granulated spent tires introduced. The mixture is mixed at this temperature for 1.5 hours. The mixture obtained is oxidized with the aid of air at a temperature of 200 C for 28 hours. The asphalt shows the following properties:
-softening point according to the ring and ball method ..... 65&
-penetration at 25C, the loading being 100 g for 5 sec.... 33 mm/10 -brittle temperature ....................................... -9C
Example III
30 kg of furfural extract, showing a viscosity of 2.6 E at a tempera-ture of 100 C, is heated to a temperature of 340 C, and 70 kg of comminuted tires are slowly added with simultaneous mixing, blowing with steam, and heat-~4 -3-ing in order to maintain the temperature of 360 C.
91 kg of rubber scrap solution and 9 kg of oil having a boiling point of 220-380 C are obtained.
20 kg of rubber scrap solution are mixed with 80 kg of road asphalt showing a penetration of 16 mm/10 at a temperature of 25C and then homogen-ized on a toothed mill. The product exhibits the following properties:
-softening point according to the ring and ball method . . . . . . . . . 63 C
-penetration at 25&, the loading being 100 g for 5 sec. . . . . . . .59mm/10 -brittle temperature ................................ -16C
-ductility at 15 C . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 cm Example IV
50 kg of anthracene oil and 50 kg of prevulcanized rubber scraps were mixed together and the mixture was heated for 15 hours at a temperature of 220C.
80 kg of natural asphalt showing a softening point of 118 C and a penetration of equal to 0 mm/10 at a temperature of 25 C were mixed together ;
with 20 kg of a rubber scrap mixture and anthracene oil to provide an asphalt exhibiting a softening point of 77 C and a penetration of 15 ~m/10 at a temp-erature of 25&.
Example V
90 kg of asphalt residue are oxidized with air at a t~mperature of 260 -320&. During the oxidation process 10 kg of ground rubber scraps are added in portions.
A homogeneous asphalt exhibiting a softening point according to the ring-ball method of 53 C and a penetration of 48 mm/10 at a temperature of 25&, and a brittle temperature of -16 C is obtained.
-~, ~ ''.
.. . . .
:'' ' , ~. .
In principle theory, in road asphalt production technology no modi-fying additions are needed, due to the thick dressing of asphalt used and the costs connected with modifying it. In fact, methods of improving road surfaces by adding to the asphalt non-vulcanized natural and synthetic rubbers in a quantity of up to 5% by weight, are known and widely used. The addition of reclaimed rubber [obtained by heating rubber scraps to a temperature of 180 under a pressure of 5 atm in the presence of peptizing agents and plasticizers]
has also been used. These additions improved both the durability of the asphalt surface, and its adhesion or stability; i.e., deformation resistance at great load, freeze resistance, grindability, adhesion to the aggregates etc. mese properties have been exhibited in a somewhat smaller degree by asphalt having a rubber dust addition.
Known asphalts modified with the aid of additions of rubber origin are expensive due to the high costs of the employed raw materials. In case of rubbers, and reclaimed rubber, the procedure of reducing the vulcanized rubber scraps to the required size of about 0,1 mm is troublesome and expensive.
This invention seeks to provide an improved asphalt containing rubber materials. Thus in a broad aspect this invention provides an asphalt composition suitable for road surfaces comprising an asphaltic basis material and a modifier, the modifier comprising from 1-50% by weight of rubber thermal degradation products in a medium chosen from petroleum asphalts, mineral oil selective refining residues, kerosene heavy residues, or coal tar oil residues, ; the degradation of the rubber being effected by heating it at a temperature of from 240-380 C in the chosen medium.
The modifying component used in the asphalt of this invention is obtained by heating rubber scraps, such as spent tires, inner tubes, and in-dustrial waste, in petroleum asphalt, the extract remaining after refining of . -1- ~
~ .~
, 105;~05~
oils with the aid of selective solvents, or heavy products of coal tar dis-tillation at a temperature of 240-380 C.
According to a preferred embodiment of the invention, rubber scraps in a quantity of 1-50% by weight, are introduced into distillation asphalt, oxidized asphalt propane refined asphalt, and or natural asphalt one, and heated at a temperature of 220-360 C to cause liquefaction of the mixture.
In order to elevate the softening point and lower the penetration, the obtained asphalt containing the rubber scrap can be oxidized with the aid of air at a temperature of 200-320&, or subjected to distillation either at a lowered `
pressure or with steam.
The rubber scraps can be subjected to destruction by introducing ` them into the asphalt during the oxidation, or during the distillation process.
According to another method the modifying component is obtained by heating the rubber scraps at a temperature of 240-380 C in the presence of petroleum asphalt, extracts remaining after selective refining of mineral oils, heavy products from destructive processing of kerosene products, or heavy coal ; tar products, the heated mixture containing from 1 to 80% by weight of rubber scraps. The mixture obtained is introduced into petroleum asphalt, or natural asphalt, in such a quantity that the content of processed rubber scraps in the finished asphalt preferably amountsto 1-50% by weight.
The modified asphalt can be subjected to an oxidation process by means of air at a temperature of 220-320 C, or to distillation at decreased pressure, or to distillation with steam, in order to obtain the desired prop-erties. It is also possible to separate the low-boiling components from the modifying component by subjecting it to distillation at reduced pressure, or to steam distillation. The distillation of rubber scrap containing products makes it possible to remove the low-boiling disagreeable-smelling components of the rubber scrap and to obtain a finished asphalt exhibiting a higher ignition temperature and a higher thermal stability.
.
l~S~057 The road asphalt obtained according to the invention methods has good performance characteristics, especially thermoplastic ones. Asphalt surfaces obtained by the use of asphalts modified with rubber scrap also have good adhesion to tires and high loading resistance.
Example I
53 kg of asphalt residue containing 3,2% by weight of paraffin are oxidized by means of air to a penetration at a temperature of 25 C equal to 36. 50 kg of the obtained oxidized asphalt are mixed at a temperature of 380 C with 50 kg of granulated spent tires over 40 minutes, with simultaneous 10 blowing with superheated steam. The obtained mixture is distilled at a pressure of lS mm of mercury and asphalt exhibiting the following properties is obtained:
- softening point according to the ring and ball method .... 61 C
-penetration at 25 C, the loading being 100 g for 5 sec .. 24mm/10 -brittle point.............................................. -7 C
-ductility at 15C.......................................... 8 cm Example II
90 kg of distillation asphalt showing a penetration of 101 mm/10 at a temperature of 25C,is heated to a temperature of 280C, and 10 kg of granulated spent tires introduced. The mixture is mixed at this temperature for 1.5 hours. The mixture obtained is oxidized with the aid of air at a temperature of 200 C for 28 hours. The asphalt shows the following properties:
-softening point according to the ring and ball method ..... 65&
-penetration at 25C, the loading being 100 g for 5 sec.... 33 mm/10 -brittle temperature ....................................... -9C
Example III
30 kg of furfural extract, showing a viscosity of 2.6 E at a tempera-ture of 100 C, is heated to a temperature of 340 C, and 70 kg of comminuted tires are slowly added with simultaneous mixing, blowing with steam, and heat-~4 -3-ing in order to maintain the temperature of 360 C.
91 kg of rubber scrap solution and 9 kg of oil having a boiling point of 220-380 C are obtained.
20 kg of rubber scrap solution are mixed with 80 kg of road asphalt showing a penetration of 16 mm/10 at a temperature of 25C and then homogen-ized on a toothed mill. The product exhibits the following properties:
-softening point according to the ring and ball method . . . . . . . . . 63 C
-penetration at 25&, the loading being 100 g for 5 sec. . . . . . . .59mm/10 -brittle temperature ................................ -16C
-ductility at 15 C . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 cm Example IV
50 kg of anthracene oil and 50 kg of prevulcanized rubber scraps were mixed together and the mixture was heated for 15 hours at a temperature of 220C.
80 kg of natural asphalt showing a softening point of 118 C and a penetration of equal to 0 mm/10 at a temperature of 25 C were mixed together ;
with 20 kg of a rubber scrap mixture and anthracene oil to provide an asphalt exhibiting a softening point of 77 C and a penetration of 15 ~m/10 at a temp-erature of 25&.
Example V
90 kg of asphalt residue are oxidized with air at a t~mperature of 260 -320&. During the oxidation process 10 kg of ground rubber scraps are added in portions.
A homogeneous asphalt exhibiting a softening point according to the ring-ball method of 53 C and a penetration of 48 mm/10 at a temperature of 25&, and a brittle temperature of -16 C is obtained.
-~, ~ ''.
.. . . .
:'' ' , ~. .
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Asphalt composition suitable for road surfaces comprising an asphaltic basis material and a modifier, the modifier comprising from 1 - 50%
by weight of rubber thermal degradation products in a medium chosen from petroleum asphalts, mineral oil selective refining residues, kerosene heavy residues, or coal tar oil residues, the degradation of the rubber being effected by heating it at a temperature of from 240 - 380°C in the chosen medium.
by weight of rubber thermal degradation products in a medium chosen from petroleum asphalts, mineral oil selective refining residues, kerosene heavy residues, or coal tar oil residues, the degradation of the rubber being effected by heating it at a temperature of from 240 - 380°C in the chosen medium.
2. Composition according to claim 1 wherein the rubber used is rubber scraps, or reclaimed spent rubber.
3. Composition according to claim 1 wherein the reclaimed rubber comprises granulated scrap vehicle tyres.
4. Composition according to claim 1 wherein the asphaltic basis material includes distillation asphalts, or oxidized asphalts, having a paraffin content of less than 60% by weight.
5. Process for the preparation of an asphalt composition suitable for road surfaces comprising an asphaltic basis material and a modifier which comprises either:
(a) thermally degrading rubber at a temperature of 240 to 380°C in a medium chosen from petroleum asphalts, mineral oil selective refining residues; kerosene heavy residues, or coal tar residues, to provide the modifier, and thereafter admixing the modifier and the asphalt to incorporate from 1 to 50% by weight of rubber degradation products therein; or (b) thermally degrading rubber at a temperature of 240° to 380°C
directly in the asphaltic basis material to incorporate the modifier directly therein, to provide from 1 to 50% by weight in the asphalt of rubber degradation products.
(a) thermally degrading rubber at a temperature of 240 to 380°C in a medium chosen from petroleum asphalts, mineral oil selective refining residues; kerosene heavy residues, or coal tar residues, to provide the modifier, and thereafter admixing the modifier and the asphalt to incorporate from 1 to 50% by weight of rubber degradation products therein; or (b) thermally degrading rubber at a temperature of 240° to 380°C
directly in the asphaltic basis material to incorporate the modifier directly therein, to provide from 1 to 50% by weight in the asphalt of rubber degradation products.
6. process according to claim 5 wherein during the thermal degradation low-boiling products are removed by distillation under reduced pressure, or by steam distillation.
7. Process according to claim 5 wherein the degradation is carried out simultaneously with an asphalt air oxidation procedure, at a temperature below 320°C.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL1975177416A PL101436B1 (en) | 1975-01-19 | 1975-01-19 | METHOD OF MAKING MODIFIED ROAD ASPHALT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1052057A true CA1052057A (en) | 1979-04-10 |
Family
ID=19970625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA243,780A Expired CA1052057A (en) | 1975-01-19 | 1976-01-19 | Asphalt composition, particularly for obtaining asphalt road surfaces, and method of producing this composition |
Country Status (21)
| Country | Link |
|---|---|
| JP (1) | JPS5840586B2 (en) |
| AT (1) | AT369418B (en) |
| BE (1) | BE837692A (en) |
| BR (1) | BR7600271A (en) |
| CA (1) | CA1052057A (en) |
| CS (1) | CS209484B2 (en) |
| DD (1) | DD123891A5 (en) |
| DE (1) | DE2601132C2 (en) |
| DK (1) | DK11776A (en) |
| FI (1) | FI66892C (en) |
| FR (1) | FR2297895A1 (en) |
| GB (1) | GB1539116A (en) |
| HU (1) | HU177847B (en) |
| IT (1) | IT1054797B (en) |
| LU (1) | LU74194A1 (en) |
| NL (1) | NL7600509A (en) |
| NO (1) | NO150282C (en) |
| PL (1) | PL101436B1 (en) |
| RO (1) | RO80997B (en) |
| SE (1) | SE429345B (en) |
| SU (1) | SU793407A3 (en) |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA77721B (en) * | 1976-02-18 | 1978-09-27 | Mobil Oil Corp | Paving grade asphalt compositions |
| JPS58201847A (en) * | 1982-04-26 | 1983-11-24 | Toa Doro Kogyo Kk | Regenerated additive composition for pavement |
| JPS58204205A (en) * | 1982-04-26 | 1983-11-28 | 東亜道路工業株式会社 | Regeneration and additive composition for pavement |
| JPS58204203A (en) * | 1982-04-26 | 1983-11-28 | 東亜道路工業株式会社 | Regeneration and additive composition for pavement |
| DE3630132C2 (en) * | 1986-09-04 | 1999-12-16 | Haas Johannes | Process for the production of an elastic bituminous insulating and sealing compound |
| EP0364585A4 (en) * | 1988-04-28 | 1990-10-24 | Nauchno-Proizvodstvennoe Obiedinenie "Dorstroitekhnika" | Bitumen-rubber composition and method of obtaining it |
| FI911739A (en) * | 1991-04-11 | 1992-10-12 | Neste Oy | BINDEMEDEL FOER ASPHALT |
| US5270361A (en) * | 1992-02-25 | 1993-12-14 | Bitumar R. & D. (2768836 Canada Inc.) | Asphalt composition and process for obtaining same |
| DE9403628U1 (en) * | 1994-03-04 | 1994-05-19 | Bredemeyer, Jörg, 01159 Dresden | Asphalt road surface with plastic admixtures |
| CN1218074A (en) * | 1997-11-20 | 1999-06-02 | 波利法尔特有限公司 | Bituminous compositions prepared with process treated vulcanized rubbers |
| CN102071613B (en) * | 2011-01-26 | 2012-05-23 | 广东华盟路桥工程有限公司 | Asphalt-treated permeable-base (ATB) construction process |
| CN102190898B (en) * | 2011-03-22 | 2012-07-04 | 四川国星高分子树脂有限公司 | Preparation method of paving asphalt modified at normal temperature |
| RU2562496C2 (en) * | 2013-09-19 | 2015-09-10 | Общество с ограниченной ответственностью "Энгельсский завод изоляционных материалов" | Polymer-bitumen binder |
| RU2543217C1 (en) * | 2013-09-27 | 2015-02-27 | Открытое акционерное общество "Уфимский завод эластомерных материалов, изделий и конструкций" | Mastic composition and method of obtaining thereof |
| US10472487B2 (en) | 2015-12-30 | 2019-11-12 | Greenmantra Recycling Technologies Ltd. | Reactor for continuously treating polymeric material |
| EP3414302B1 (en) | 2016-02-13 | 2022-06-22 | GreenMantra Recycling Technologies Ltd | Polymer-modified asphalt with wax additive |
| WO2017161463A1 (en) | 2016-03-24 | 2017-09-28 | Greenmantra Recycling Technologies Ltd. | Wax as a melt flow modifier and processing aid for polymers |
| RU2630529C1 (en) * | 2016-05-26 | 2017-09-11 | Владимир Георгиевич Андриенко | Method for production of modified bituminous binders for road surfaces (versions) |
| CN114479173A (en) | 2016-09-29 | 2022-05-13 | 绿色颂歌再生科技有限公司 | Reactor for treating polystyrene materials |
| RU2656486C1 (en) * | 2017-09-22 | 2018-06-05 | Общество с ограниченной ответственностью "Энгельсский завод изоляционных материалов" | Method of producing insulation composition (versions) |
| CN109294610A (en) * | 2018-11-08 | 2019-02-01 | 攀钢集团攀枝花钢钒有限公司 | For the Production Process for Modified Pitch and device of high QI and high TI tar stock |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD7888A (en) * | ||||
| GB787873A (en) * | 1954-10-18 | 1957-12-18 | Us Rubber Co | Improvements in thermoplastic compositions |
| FR1120244A (en) * | 1955-01-21 | 1956-07-03 | Exxon Standard Sa | Process for dissolving synthetic rubber in bitumens |
| US3844668A (en) * | 1972-01-13 | 1974-10-29 | R Winters | Pavement composition |
| JPS4933916A (en) * | 1972-07-29 | 1974-03-28 |
-
1975
- 1975-01-19 PL PL1975177416A patent/PL101436B1/en unknown
- 1975-12-29 FI FI753663A patent/FI66892C/en not_active IP Right Cessation
-
1976
- 1976-01-09 NO NO760068A patent/NO150282C/en unknown
- 1976-01-12 SU SU762313353A patent/SU793407A3/en active
- 1976-01-13 DK DK11776*#A patent/DK11776A/en not_active Application Discontinuation
- 1976-01-14 DE DE2601132A patent/DE2601132C2/en not_active Expired
- 1976-01-15 SE SE7600378A patent/SE429345B/en not_active IP Right Cessation
- 1976-01-15 CS CS76269A patent/CS209484B2/en unknown
- 1976-01-16 LU LU74194A patent/LU74194A1/xx unknown
- 1976-01-16 AT AT0027576A patent/AT369418B/en not_active IP Right Cessation
- 1976-01-16 HU HU76II233A patent/HU177847B/en unknown
- 1976-01-16 DD DD190846A patent/DD123891A5/xx unknown
- 1976-01-16 IT IT19337/76A patent/IT1054797B/en active
- 1976-01-16 BR BR7600271A patent/BR7600271A/en unknown
- 1976-01-17 RO RO84533A patent/RO80997B/en unknown
- 1976-01-19 FR FR7601248A patent/FR2297895A1/en active Granted
- 1976-01-19 BE BE163615A patent/BE837692A/en not_active IP Right Cessation
- 1976-01-19 GB GB406/76A patent/GB1539116A/en not_active Expired
- 1976-01-19 JP JP51004843A patent/JPS5840586B2/en not_active Expired
- 1976-01-19 NL NL7600509A patent/NL7600509A/en not_active Application Discontinuation
- 1976-01-19 CA CA243,780A patent/CA1052057A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| LU74194A1 (en) | 1976-05-18 |
| FR2297895B1 (en) | 1979-07-06 |
| IT1054797B (en) | 1981-11-30 |
| DE2601132C2 (en) | 1982-03-25 |
| NO150282C (en) | 1984-09-19 |
| BR7600271A (en) | 1976-08-31 |
| NL7600509A (en) | 1976-07-21 |
| PL101436B1 (en) | 1978-12-30 |
| HU177847B (en) | 1981-12-28 |
| AT369418B (en) | 1982-12-27 |
| ATA27576A (en) | 1982-05-15 |
| NO760068L (en) | 1976-07-20 |
| FI753663A (en) | 1976-07-20 |
| FR2297895A1 (en) | 1976-08-13 |
| SE429345B (en) | 1983-08-29 |
| BE837692A (en) | 1976-05-14 |
| DE2601132A1 (en) | 1976-07-22 |
| RO80997B (en) | 1984-08-30 |
| FI66892B (en) | 1984-08-31 |
| JPS51125412A (en) | 1976-11-01 |
| SU793407A3 (en) | 1980-12-30 |
| CS209484B2 (en) | 1981-12-31 |
| GB1539116A (en) | 1979-01-24 |
| RO80997A (en) | 1984-06-21 |
| NO150282B (en) | 1984-06-12 |
| JPS5840586B2 (en) | 1983-09-06 |
| DD123891A5 (en) | 1977-01-19 |
| SE7600378L (en) | 1976-07-20 |
| FI66892C (en) | 1984-12-10 |
| DK11776A (en) | 1976-07-20 |
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