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US 5,594,072 AGranted
Liquid star polymers having terminal hydroxyl groups
AssigneeShell Oil Company
InventorsDale L. Handlin, Jr., Carl L. Willis, Daniel E. Goodwin, David J. St. Clair
Life of this patent
Estimating the term…
Abstract
Star polymers of isoprene or butadiene having terminal hydroxyl groups have reduced viscosity when the hydroxyl groups are located on polymeric arms that are grown from the core of the star molecules. The polymers are useful in making coatings, sealants, and binders.
Claims7
A polymer, comprising:
- the structure:
- ##STR3## wherein each A is a hydrogenated or unsaturated block or segment comprising a preponderance of a polymerized conjugated diene having a peak molecular weight from 400 to 40,000 as measured by GPC, t is from 2 to 30, B is the residue of a hydrogenated or unsaturated monolithium conjugated diene polymer having a peak molecular weight from 1,500 to 15,000 as measured by GPC, Y is a crosslinked core comprising a compound having at least two independently polymerized vinyl groups, r>t, and 0<u<(r-t).
Dependencies are inferred from the claim text.