Complex tolylene polurea grease composition and process
AssigneeChevron Research and Technology Company
InventorGian L. Fagan
Life of this patent
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Abstract
Disclosed is complex tolylene polyurea-thickened grease containing less than 7 parts per million 2,4-diaminotoluene and a process for making said grease comprising reacting an isocyanate, a polyamine and monoamine with a major portion of a lubricating oil and thereafter adding an alkaline earth metal oxide or hydroxide and a carboxylic acid anhydride containing 2 to 20 carbon atoms to said mixture and thereafter milling said mixture to the consistency of grease.
Claims27
A complex tolylene polyurea-thickened grease containing less than 7 parts per million 2,4-diaminotoluene.
A grease composition comprising a major amount of a lubricating oil, a tolylene polyurea gellant in an amount sufficient to thicken the lubricating oil to grease consistency, and from 4 to 15 weight percent of an alkaline earth metal aliphatic monocarboxylate having from 1 to 3 carbons wherein the weight ratio of alkaline earth metal carboxylate to polyurea gellant compound is from 1 to 10 and wherein said grease composition contains less than 7 parts per million 2,4-diaminotoluene.
A grease composition comprising a major amount of a lubricating oil, a tolylene polyurea gellant in an amount 1 to 25 weight percent wherein said polyurea has the following formula:
- ##STR5## wherein x is an integer of from 1 to 3, R.sup.a and R.sup.d are the same or different and are hydrocarbyl of from 5 to 28 carbon atoms, and R.sup.b and R.sup.c may be the same or different and will be hydrocarbylene of from 2 to 26 carbon atoms, and from 4 to 15 weight percent of a calcium carboxylate, and wherein said grease composition contains less than 5 parts per million 2,4-diaminotoluene.
A method for preparing a grease composition which comprises:
- mixing a diisocyanate containing 4 to 32 carbon atoms, a polyamine containing 2 to 40 carbon atoms and a monoamine containing 1 to 30 carbon atoms with a major portion of a lubricating oil, the molar ratio of diisocyanate to polyamine to monoamine being 1:0-2:0.1-2;
- maintaining said mixture at a temperature of 60.degree. to 320.degree. F. for a period of 0.5 to 10 hours;
- thereafter adding an alkaline earth metal oxide or hydroxide, a carboxylic acid anhydride containing 2 to 20 carbon atoms and a promoting amount of water to said mixture;
- thereafter milling said mixture to the consistency of grease.
A grease composition comprising a major portion of an oil of lubricating viscosity, from 3 to 30 weight percent of an alkaline earth metal carbonate or mixtures of an alkaline earth metal carbonate and carboxylate and a polyurea compound wherein said grease composition is prepared by reacting the following components:
- (1) mixing a diisocyanate containing 4 to 32 carbon atoms, a polyamine containing 2 to 40 carbon atoms and a monoamine containing 1 to 30 carbon atoms with a major portion of a lubricating oil, the molar ratio of diisocyanate to polyamine to monoamine being 1:0-2:0.1-2;
- (2) maintaining said mixture at a temperature of 60.degree. to 320.degree. F. for a period of 0.5 to 10 hours;
- (3) thereafter adding an alkaline earth metal oxide or hydroxide and a carboxylic acid anhydride containing 2 to 20 carbon atoms and a promoting amount of water to said mixture, and optionally carbon dioxide;
- and
- (4) thereafter milling said mixture to the consistency of grease.
Dependencies are inferred from the claim text.