Bituminous compositions comprising additives having improved thermoreversible properties

Patent metadata

Field	Value
Publication number	US-10131788-B2
Application number	US-201314411711-A
Country	US
Kind code	B2
Filing date	Jun 28, 2013
Priority date	Jul 2, 2012
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

The disclosure relates to a bituminous composition and to the method of preparation thereof. The bituminous composition includes a bitumen, a first additive including at least one fatty acid ester function, saturated or unsaturated, linear or branched, having a hydrocarbon chain with 4 to 36 carbon atoms, optionally substituted by at least one hydroxyl group and a second additive comprising at least one organogelator. The disclosure also relates to the use of a combination of the first and second additives in a bituminous composition, for lowering the dynamic viscosity of a bituminous composition or of a bitumen base at a temperature above or equal to 80° C., preferably above 80° C., without impairing the consistence of the composition at the temperatures of use. Finally, the disclosure relates to the use of these bituminous compositions in the fields of highway applications, in particular in the manufacture of highway binders, and in the fields of industrial applications.

First claim

The invention claimed is:

1. A thermoreversibly cross-linked bituminous composition comprising:
a bitumen;
a first additive being selected from triglycerides of fatty acids comprising three hydrocarbon chains, identical or different, each independently having from 4 to 36 carbon atoms, saturated or unsaturated, linear or branched; and
a second additive comprising at least one organogelator of the following general formula (I) or (II):
R 1 —CONH—X—NHCO—R 2   (I)

in which the groups R 1 , R 2 and X are identical or different and represent independently a hydrocarbon chain with 4 to 36 carbon atoms, saturated or unsaturated, linear or branched, cyclic or acyclic;
R 3 —(COOH) z   (II)

in which R 3 is a linear or branched, saturated or unsaturated hydrocarbon chain comprising from 4 to 68 carbon atoms and z is an integer in the range from 2 to 4; and
wherein the weight ratio between the first additive and the second additive in said bituminous composition is comprised between 10:1 and 3:1.

2. The composition according to claim 1 , wherein the fatty acids are saturated.

3. The composition according to claim 1 , wherein the organogelator is a diacid of general formula HOOC—(CH 2 ) w —COOH with w an integer in the range from 4 to 22.

4. The composition according to claim 3 , wherein w is an integer in the range from 4 to 18.

5. The composition according to claim 1 , wherein the organogelator is a diacid selected from the group consisting of adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, 1,2-dodecanedioic acid and tetradecanedioic acid.

6. The composition according to claim 1 , wherein the organogelator is represented by formula (I) in which X represents the group —(CH 2 ) p — with p being comprised between 1 and 8.

7. The composition according to claim 6 , wherein p is comprised between 1 and 4.

8. The composition according to claim 1 , wherein the organogelator is represented by formula (I) in which R 1 and R 2 are identical or different and represent, independently, a saturated, acyclic, linear or branched hydrocarbon chain with 4 to 36 carbon atoms.

9. The composition according to claim 1 , wherein said composition comprises from 0.1 to 10% by weight of the first and second additives relative to the weight of bitumen.

10. The composition according to claim 1 , further comprising aggregates of bituminous mixes and at least one of mineral fillers and synthetic fillers.

11. A bituminous binder in the form of a synthetic binder, an anhydrous binder, a bituminous emulsion, a polymeric bitumen or a fluxed bitumen comprising a bituminous composition comprising:
a bitumen;
a first additive being selected from triglycerides of fatty acids comprising three hydrocarbon chains, identical or different, each independently having from 4 to 36 carbon atoms, saturated or unsaturated, linear or branched; and
a second additive comprising at least one organogelator of the following general formula (I) or (II):
R 1 —CONH—X—NHCO—R 2   (I)

in which the groups R 1 , R 2 and X are identical or different and represent independently a hydrocarbon chain with 4 to 36 carbon atoms, saturated or unsaturated, linear or branched, cyclic or acyclic;
R 3 —(COOH) z   (II)

in which R 3 is a linear or branched, saturated or unsaturated hydrocarbon chain comprising from 4 to 68 carbon atoms and z is an integer in the range from 2 to 4; and
wherein the weight ratio between the first additive and the second additive in said bituminous composition is comprised between 10:1 and 3:1.

12. A method of preparing the bituminous composition of claim 1 , the method comprising:
adding the first and second additives at temperatures in the range from 100 to 180° C., either to the bitumen alone, the bitumen whether or not modified by polymers, the bitumen in the form of bituminous binder or the bitumen in the form of anhydrous binder, bituminous mix, or surface dressing, or during manufacture of the bitumen, bituminous mixes, binders or coatings.

13. A method for thermoreversibly cross-linking a bituminous composition or a bitumen base, comprising introducing the combination of a first additive and a second additive as described in claim 1 in the bituminous composition or the bitumen base.

14. The method for lowering the dynamic viscosity of a bituminous composition or a bitumen base at a temperature above or equal to 80° C., without impairing a consistency of the composition or base at the temperatures of use, comprising introducing the combination of the first additive and the second additive as described in claim 1 in the bituminous composition or the bitumen base.

15. The method according to claim 14 , for increasing a softening point determined by a ring and ball test according to standard EN 1427 (RBT) and a penetration index (or Pfeiffer index, PI) while lowering a dynamic viscosity at a temperature above or equal to 80° C., of the bituminous composition or a bitumen base, comprising introducing the combination of a first additive and a second additive in the bituminous composition or the bitumen base.

16. The method according to claim 15 , in which the first additive introduced comprises an organogelator of general formula (I).

17. The method according to claim 14 , for lowering a needle penetration at 25° C. calculated according to standard EN 1426 (P 25 ) of the bituminous composition or the bitumen base, comprising introducing the combination of the first additive and the second additive in the bituminous composition or the bitumen base.

Assignees

• Total Marketing Services

Inventors

• Basset Dominique
• Vincent Régis

Classifications

• C08K5/092

  Polycarboxylic acids · CPC title

• C08L95/00 Primary

  Compositions of bituminous materials, e.g. asphalt, tar, pitch · CPC title

• C08K5/20

  Carboxylic acid amides · CPC title

• C09D195/00

  Coating compositions based on bituminous materials, e.g. asphalt, tar, pitch · CPC title

• C08L2555/60

  Organic non-macromolecular ingredients, e.g. oil, fat, wax or natural dye · CPC title