Patent ID: 6120905
Filing Date: 2000-09-19
Classification: C08G,Y10T

Abstract:
A network nonisocyanate polyurethane polymer formed by cross-linking a cyclocarbonate oligomer and an amine oligomer,wherein the cyclocarbonate oligomer has an average functionality towards primary amines from about 2.0 to about 5.44,wherein the cyclocarbonate oligomer comprises at least one cyclocarbonate-terminated oligomer terminated with a plurality of cyclocarbonate groups,wherein at least one cyclocarbonate-terminated oligomer further comprises from about 4% to about 12% by weight of terminal epoxy groups based on the weight of terminal cyclocarbonate groups present,wherein the amine oligomer has an average functionality towards cyclocarbonate groups of from about 3.0 to about 3.8,wherein the amine oligomer consists essentially of at least one primary amine-terminated oligomer, wherein each primary amine-terminated oligomer is terminated with a plurality of primary amine groups, wherein each primary amine group is linked to the at least one primary amine-terminated oligomer by a linking group comprising, independently, from at least one to about twelve carbon atoms, a first end and a second end, wherein the first end of each linking group is bonded to the nitrogen atom of the primary amine group and the second end of each linking group is bonded to the amine oligomer, and wherein each linking group carbon atom adjacent to the nitrogen atom of each primary amine group is independently selected from the group consisting of a methylene carbon atom and a methine carbon atom, provided that,(1) when the second end of the linking group is bonded to an aliphatic ring, the linking group comprises at least one methylene carbon atom wherein the first end of the linking group comprises the methylene carbon atom,(2) when the second end of the linking group is bonded to an aromatic ring, the linking group comprises at least two adjacent methylene carbon atoms wherein the first end of the linking group comprises the two adjacent methylene carbon atoms, and(3) when the second end of the linking group is bonded to an amine oligomer comprising siloxane groups, the linking group comprises at least three adjacent methylene carbon atoms wherein the first end of the linking group comprises the three adjacent methylene carbon atoms,wherein the amine oligomer is present in an amount from about 0.93 to about 0.99 of the amount of the amine oligomer that would be required to achieve a stoichiometric ratio of the primary amine groups of the amine oligomer to the cyclocarbonate groups of the cyclocarbonate oligomer, andwherein the network polymer formed has a gel fraction of not less than about 0.96 by weight.