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US 10,787,623 B2Granted
Hydrogenated polybutadienes useful as lubricant additives
AssigneeEvonik Operations GmbH
InventorsSofia Sirak, Holger Pletsch, Marius Kemper
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Abstract
The invention relates to low molecular weight hydrogenated polybutadienes and to a method for the preparation of these polymers. The invention is also directed to lubricant compositions comprising these polymers and uses thereof.
Claims13
A hydrogenated polybutadiene, consisting of:
- 25 to 45% by weight of monomer units of 1,4-butadiene;
- and
- 55 to 75% by weight of monomer units of 1,2-butadiene, based on a total weight of the hydrogenated polybutadiene;
- wherein:
- a weight ratio of the monomer units of 1,4-butadiene to the monomer units of 1,2-butadiene is a same statistical distribution throughout the length of the hydrogenated polybutadiene,
- a weight-average molecular weight of the hydrogenated polybutadiene is between 2,000 g/mol and 10,000 g/mol;
- and
- a hydrogenation degree of the hydrogenated polybutadiene is more than 99%, and
- wherein the hydrogenated polybutadiene is not a block polymer.
6 more elements
Dependencies are inferred from the claim text.