Titanium complex grease composition including performance additives and process for preparation thereof

A lubricating grease composition includes from 2 to 20% by weight of titanium alkoxide; from 2 to 20% by weight of carboxylic acid other than fatty acid; from 5.0 to 35.0% by weight of fatty acids; from 0.0 to 5.0% by weight of water; from 20 to 90% by weight of oil selected from the group consisting of mineral and synthetic oil; and from 0.01 to 50% of performance additives.

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What is claimed is:

1. A lubricating grease composition, comprising:

from 2 to 20% by weight of titanium alkoxide;

from 2 to 20% by weight of carboxylic acid other than a fatty acid;

from 5.0 to 35.0% by weight of fatty acids;

from 0.0 to 5.0% by weight of water;

from 20 to 90% by weight of oil selected from the group consisting of mineral and synthetic oil; and

from 0.01 to 50% by weight of at least one performance additive comprised of an extreme pressure additive which comprises zinc dialkyl dithiaphosphate in combination with a solid lubricant which comprises sulfurized fat.

2. The lubricating grease composition as claimed in claim 1, wherein said extreme pressure additive and said solid lubricant are each present in an amount ranging from 0.01 to 10% by weight.

3. A process for preparation of a lubricating grease composition, comprising the steps of:

forming a mixture in a first stage by adding together fatty acid, carboxylic acid other than a fatty acid and one of mineral or synthetic oil;

stirring and heating the mixture to a temperature ranging from 70 to 100.degree. C.;

adding titanium alkoxide to the mixture in a second stage while maintaining said temperature;

forming a thickened grease product by raising the temperature to from 100 to 200.degree. C.;

cooling said thickened grease product;

optionally adding water to the thickened grease product in a third stage;

subjecting the thickened grease mixture to shearing;

adding at least one performance additive comprised of an extreme pressure additive which comprises zinc dialkyl dithiaphosphate in combination with a solid lubricant which comprises sulfurized fat at a temperature ranging from 60 to 160.degree. C. while cooling; and

subjecting the thickened grease mixture after cooling to at least one of homogenizing or milling.

4. The process as claimed in claim 3, wherein from 2 to 20% of titanium alkoxide is added.

5. The process as claimed in claim 3, wherein the mixture in the first state is continuously mixed and is held at a temperature ranging from 70 to 100.degree. C. for from 1 to 2 hours and, in the second stage, is held at a temperature rangingfrom 100 to 200.degree. C. for a period of 2 to 8 hours.

6. The process as claimed in claim 3, wherein the mixture is cooled with continuous stirring to a temperature ranging from 100 to 140.degree. C. and from 0 to 5% by weight of water is added.

7. A process for the preparation of a lubricating grease composition, comprising:

preparing a mixture in a first stage by adding together fatty acid, carboxylic acid other than a fatty acid, titanium alkoxide and an oil selected from the group consisting of mineral and synthetic oil;

heating said mixture to a temperature ranging from 160 to 200.degree. C.;

cooling said mixture to a temperature ranging from 100 to 140.degree. C.;

optionally adding water to the mixture after cooling in a second stage;

stirring said mixture after cooling;

further cooling said mixture;

adding at least one performance additive comprised of an extreme pressure additive which comprises zinc dialkyl dithiaphosphate in combination with a solid lubricant which comprises sulfurized fat to the mixture after further cooling; and

subjecting the mixture to shearing.

8. The process as claimed in claim 1, wherein said mixture is cooled in from 2 to 8 hours.