Melt processible polyureas and polyurea-urethanes, method for the production thereof and products made therefrom

Patent metadata

Field	Value
Publication number	US-9957346-B2
Application number	US-201214001214-A
Country	US
Kind code	B2
Filing date	Feb 23, 2012
Priority date	Feb 23, 2011
Publication date	May 1, 2018
Grant date	May 1, 2018

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 (T flow ) while maintaining the excellent mechanical properties such that the resulting polyurea elatomer is rendered melt-processable.

First claim

What is claimed is:

1. 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 M n 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 M n of 800 g/mol mixed with hydroxyl-telechelic poly(pentamethylene carbonate) having a M n of 500 g/mol;
wherein the elastomer is melt processible.

2. The polyurea-urethane elastomer according to claim 1 , wherein the hard segment content is at least 30% by weight of the elastomer.

3. The polyurea-urethane elastomer according to claim 2 , wherein the hard segment content is at least 35% by weight of the elastomer.

4. The polyurea-urethane elastomer according to claim 1 , wherein the H-bond accepting chain extender has more nucleophilic groups than are found in ethylene glycol.

5. The polyurea-urethane elastomer according to claim 1 , wherein at least 2 percent by weight of the elastomer of the H-bond accepting chain extender is present.

6. The polyurea-urethane elastomer according to claim 1 , wherein the elastomer has a T flow of less than 220° C.

7. The polyurea-urethane elastomer according claim 6 , wherein the elastomer has a T flow of less than 200° C.

8. The polyurea-urethane elastomer according claim 6 , wherein the elastomer has a T flow of less than 190° C.

9. The polyurea-urethane elastomer according claim 6 , wherein the elastomer has a T flow in the range of from 170° C. to 210° C.

Assignees

• Kennedy Joseph
• Kang Jungmee
• Erdodi Gabor
• Univ Akron

Inventors

• Kennedy Joseph
• Kang Jungmee
• Erdodi Gabor

Classifications

• C08L75/04

  Polyurethanes · CPC title

• C08G18/3275

  containing two hydroxy groups · CPC title

• C08G18/4854

  Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group · CPC title

• C08G18/6529

  Compounds of group C08G18/3225 or polyamines of C08G18/38 · CPC title

• C08G18/44

  Polycarbonates · CPC title