Urethane oligomers and polyurethanes
AssigneeFiber-Cote Corporation
InventorsLeonid Rappoport, Roger D. Brown
Life of this patent
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Abstract
A urethane is formed in a new way, without requiring the use of isocyanates. The urethane is formed by reacting a compound containing a plurality of cyclocarbonate groups with a diamine in which the two amine groups have different reactivities with cyclocarbonate, so as to form a urethane oligomer with amine end groups. The urethane oligomer can then be reacted in several different ways to form polyurethane.
Claims15
An oligomer having at least one urethane group and having at least one end fragment containing an amine group, wherein said oligomer is stable at atmospheric pressure and room temperature.
An oligomer having the formula:
- ##STR5## where U is ##STR6## R.sub.1 is the root of an epoxide resin with the epoxide groups removed, and
- R.sub.2 is the root of a diamine with the amine groups removed.
A new method, including the step of reacting a compound including a plurality of cyclocarbonate groups with a diamine having two amine groups of different reactivities, to form an oligomer having at least one urethane group and at least one amine end group.
Dependencies are inferred from the claim text.