Process for preparing a grease
The invention provides for a process for preparing a lubricating grease. The process can be carried out in the presence of a base oil and avoids the use of diisocyanate reagents.
1. A process for preparing a lubricating grease comprising a step in which a compound of formula (a) is reacted with a compound of formula (b) to provide a compound of formula (c):
wherein R 1 is chosen from hydrocarbyl having from 1 to 30 carbon atoms, R 2 is chosen from hydrocarbyl or hydrocarbylene comprising from 1 to 30 carbon atoms, R 3 is chosen from hydrocarbyl comprising from 2 to 30 carbon atoms and n is an integer of 2,
wherein the reaction of the compound of formula (a) with the compound of formula (b) is carried out in the presence of a base oil, or the compound of formula (c) is mixed with a base oil; and
wherein the lubricating grease has a melting point of 180° C. or higher.
2. The process according to claim 1 , wherein R 1 is an alkyl group having from 1 to 6 carbon atoms.
3. The process according to claim 1 , wherein n is 2 and R 2 is chosen from arylene comprising from 6 to 14 carbon atoms or alkylene comprising from 2 to 12 carbon atoms.
4. The process according to claim 1 , wherein R 3 is aryl having from 6 to 12 carbon atoms or is alkyl comprising from 2 to 18 carbon atoms.
5. The process according to claim 1 , wherein the lubricating grease comprises the compound of formula (c) in a range of from 2 weight percent to 25 weight percent, based on the total weight of the lubricating grease.
6. A lubricating grease comprising a compound of formula (c):
wherein R 2 is chosen from hydrocarbyl or hydrocarbylene comprising from 1 to 30 carbon atoms, R 3 is chosen from hydrocarbyl comprising from 2 to 30 carbon atoms and n is an integer of 2,
and a base oil; and
wherein the lubricating grease has a melting point of 180° C. or higher.
7. The lubricating grease according to claim 6 , wherein R 2 is chosen from arylene comprising from 6 to 14 carbon atoms or alkylene comprising from 2 to 12 carbon atoms.
8. The lubricating grease according to claim 6 , wherein R 3 is aryl having from 6 to 12 carbon atoms or is alkyl comprising from 2 to 18 carbon atoms.
9. The lubricating grease according to claim 6 , wherein the lubricating grease comprises the compound of formula (c) in a range of from 2 weight percent to 25 weight percent, based on the total weight of the lubricating grease.
10. The process for preparing a lubricating grease comprising a step in which a compound of formula (a) is reacted with a compound of formula (d) to provide a compound of formula (e):
and a step wherein the compound of formula (e) is reacted with a compound of formula (b) to provide a compound of formula (f):
wherein R 1 is chosen from hydrocarbyl having from 1 to 30 carbon atoms, R 2 is chosen from hydrocarbylene comprising from 1 to 30 carbon atoms, R 3 is chosen from hydrocarbyl comprising from 2 to 30 carbon atoms, n is 2 and m is an integer of 1 or more,
and wherein the reaction of the compound of formula (e) with the compound of formula (b) is carried out in the presence of a base oil, or the compound of formula (f) is mixed with a base oil.