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US 9,957,346 B2Granted
Melt processible polyureas and polyurea-urethanes, method for the production thereof and products made therefrom
AssigneeThe University of Akron
InventorsJoseph Kennedy, Jungmee Kang, Gabor Erdodi
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Abstract
A polyurea or polyurea-urethane elastomer comprises a soft polymer segment and a hard polymer segment, wherein the hard polymer segment includes polyurea groups in combination with H-bond accepting chain extenders (HACEs) to reduce the flow temperature (Tflow) while maintaining the excellent mechanical properties such that the resulting polyurea elatomer is rendered melt-processable.
Claims9
A polyurea-urethane elastomer comprising:
- at least one soft segment selected from polyisobutylene and poly(tetramethylene oxide);
- and
- at least two hard segments, wherein at least one hard segment comprises a plurality of urethane groups and an H-bond accepting chain extender, and wherein at least a second hard segment comprises a plurality of urea groups and a chain extender having a Mn of less than 150 g/mol formed from an aliphatic diamine, an aromatic diamine and a combination of aliphatic and aromatic diamines, wherein the urea groups, the urethane groups, and the H-bond accepting chain extender form H bonds, wherein the H-bond accepting chain extender is formed from a 50 mol % blend of hydroxyl-telechelic poly(hexamethylene carbonate) having a Mn of 800 g/mol mixed with hydroxyl-telechelic poly(pentamethylene carbonate) having a Mn of 500 g/mol;
- wherein the elastomer is melt processible.
1 more element
Dependencies are inferred from the claim text.