Bitumen composition
View Patent ↗The present invention provides a bitumen composition including: —(i) from 0.1 to 25% wt of an elastomer, (ii) from 0.1 to 40% wt of a solvent, (iii) from 30 to 99% wt of a bitumen, (iv) from 0.1 to 30% wt of a lithium salt of a C 10 –C 40 fatty acid or hydroxy fatty acid, and optionally (v) from 0 to 70% wt of a filler, all weights based on total bitumen composition, wherein the solvent is of general formula (I), wherein R 1 represents a hydrogen atom or a hydrocarbyl group having from 1 to 6 carbon atoms, R 2 represents a hydrocarbyl group having from 1 to 6 carbon atoms, and the sum of the carbon atoms in R 1 and R 2 is from 5 to 7; a process of preparing said bitumen composition and the use of the composition as a cold-applicable adhesive.
1. A bitumen composition comprising:
(i) from 0.1 to 25% wt of an elastomer,
(ii) from 0.1 to 40% wt of a solvent,
(iii) from 30 to 99% wt of a bitumen,
(iv) from 0.1 to 30% wt of a lithium salt of a C 10 –C 40 fatty acid or hydroxy fatty acid, and optionally
(v) from 0 to 70% wt of a filler, all weights based on total bitumen composition,
wherein the solvent is of general formula (I)
wherein R 1 represents a hydrogen atom or a hydrocarbyl group having from 1 to 6 carbon atoms, R 2 represents a hydrocarbyl group having from 1 to 6 carbon atoms, and the sum of the carbon atoms in R 1 and R 2 is from 5 to 7.
2. The bitumen composition of claim 1 , wherein the elastomer is a block copolymer comprising at least two terminal poly(monovinylaromatic hydrocarbon) blocks and at least one central poly(conjugated diene) block.
3. The bitumen composition of claim 1 , wherein, in the solvent of general formula (I), R 1 and R 2 each independently represent an alkyl group having from 2 to 4 carbon atoms and the sum of the carbon atoms in R 1 and R 2 is 6.
4. The bitumen composition of claim 3 , wherein the solvent of general formula (I) is n-butyl propionate.
5. The bitumen composition of claim 1 , wherein the bitumen has a penetration in the range of from 100 to 300 dmm.
6. The bitumen composition of claim 1 , wherein the lithium salt is a lithium salt of a C 12 –C 22 fatty acid or hydroxy fatty acid.
7. A process comprising using the bitumen composition of claim 1 as a cold-applicable adhesive.
8. A process of preparing a bitumen composition which comprises mixing a first component (A) comprising (i) from 0.1 to 25% wt of an elastomer, and (ii) from 0.1 to 40% wt of a solvent; with a second component (B) comprising (iii) from 30 to 99% wt of a bitumen, (iv) from 0.1 to 30% wt of a lithium salt of a C 10 –C 40 fatty acid or hydroxy fatty acid, and optionally (v) from 0 to 70% wt of a filler, all weights based on total bitumen composition, wherein the solvent is of general formula (I)
wherein R 1 represents a hydrogen atom or a hydrocarbyl group having from 1 to 6 carbon atoms, R 2 represents a hydrocarbyl group having from 1 to 6 carbon atoms, and the sum of the carbon atoms in R 1 and R 2 is from 5 to 7.
9. The process of claim 8 further comprising preparing component (B) by heating the bitumen to a temperature in the range of from 200 to 300° C., and then adding the lithium salt.
10. The process of claim 8 , wherein the weight ratio of component (A) to component (B) is in the range of from 1:20 to 1:5.
11. The bitumen composition of claim 2 , wherein, in the solvent of general formula (I), R 1 and R 2 each independently represent an alkyl group having from 2 to 4 carbon atoms and the sum of the carbon atoms in R 1 and R 2 is 6.
12. The bitumen composition of claim 2 , wherein the bitumen has a penetration in the range of from 100 to 300 dmm.
13. The bitumen composition of claim 3 , wherein the bitumen has a penetration in the range of from 100 to 300 dmm.
14. The bitumen composition of claim 4 , wherein the bitumen has a penetration in the range of from 100 to 300 dmm.
15. The bitumen composition of claim 2 , wherein the lithium salt is a lithium salt of a C 12 –C 22 fatty acid or hydroxy fatty acid.
16. The bitumen composition of claim 3 , wherein the lithium salt is a lithium salt of a C 12 –C 22 fatty acid or hydroxy fatty acid.
17. The bitumen composition of claim 4 , wherein the lithium salt is a lithium salt of a C 12 –C 22 fatty acid or hydroxy fatty acid.
18. The bitumen composition of claim 5 , wherein the lithium salt is a lithium salt of a C 12 –C 22 fatty acid or hydroxy fatty acid.
19. A process comprising using the bitumen composition of claim 2 as a cold-applicable adhesive.
20. A process comprising using the bitumen composition of claim 3 as a cold-applicable adhesive.
21. A process comprising using the bitumen composition of claim 4 as a cold-applicable adhesive.
22. A process comprising using the bitumen composition of claim 5 as a cold-applicable adhesive.
23. A process comprising using the bitumen composition of claim 6 as a cold-applicable adhesive.
24. The process of claim 9 , wherein the weight ratio of component (A) to component (B) is in the range of from 1:20 to 1:5.