POLYURETHANE ELASTOMERS

• US 20110028642A1
• Filed: 04/08/2009
• Published: 02/03/2011
• Est. Priority Date: 04/09/2008
• Status: Abandoned Application

• Current Assignee: Dow Global Technologies LLC (Dow, Inc.)
• Original Assignee: Dow Global Technologies, Inc. (Dow, Inc.)
• Inventors: Argyropoulos, John N., Xie, Rui, Bhattacharjee, Debkumar
• Application Number:
  US12/936,746
• Publication Number:
  US 20110028642A1
• Time in Patent Office: Days
• US Class Current: 524/590
• CPC Class Codes: C08G 18/10 Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• CPC Class Codes: C08G 18/3206 aliphatic
• CPC Class Codes: C08G 18/4277 Caprolactone and/or substituted caprolactone
• CPC Class Codes: C08G 18/757 containing at least two isocyanate or isothiocyanate groups linked to the cycloaliphatic ring by means of an aliphatic group

Abstract

A polyurethane elastomer is provided. The elastomer is the reaction product of at least a prepolymer and a chain extender, where the prepolymer is the reaction product of at least one polyol and at least one aliphatic diisocyanate. The chain extender is at least one of a diol or a non-aromatic diamine.

Claims

1. A polyurethane elastomer, comprising:

the reaction product of at least a prepolymer and a chain extender, wherein the prepolymer comprises the reaction product of at least one polyol and at least one aliphatic diisocyanate, the chain extender is at least one of a diol or a non-aromatic diamine, the aliphatic diisocyanate comprises a mixture of 1,3-bis(isocyanatomethyl)cyclohexane and 1,4-bis(isocyanatomethyl)cyclohexane, and wherein the polyurethane elastomer has a change in elastic modulus of less than about 94% over a temperature range of between about 0°

C. and about 150°

C.

2. The polyurethane elastomer of claim 1, wherein the change in elastic modulus is less than about 90% over a temperature range of between about 0°

C. and about 100°

C.

3. The polyurethane elastomer of claim 1, wherein the change in elastic modulus is less than about 85% over a temperature range of between about 75°

C. and about 125°

C.

4. The polyurethane elastomer of claim 1, wherein the change in elastic modulus is less than about 85% over a temperature range of between about 50°

C. and about 100°

C.

5. The polyurethane elastomer of claim 1, wherein the change in elastic modulus is less than about 70% over a temperature range of between about 25°

C. and about 75°

C.

7. The polyurethane elastomer of claim 1, wherein the polyurethane elastomer has Bashore Rebound of at least 50%.

8. The polyurethane elastomer of claim 1, wherein the polyurethane elastomer has an elastic modulus of at least 1.2*10⁶ Pa at temperatures of at least about 100°

C.

9. The polyurethane elastomer of claim 1, wherein the polyurethane elastomer has an elastic modulus of at least 10⁷ Pa at temperatures of at least about 100°

C.

18. An article, comprising the polyurethane elastomer of claim 1.

19. The article of claim 18, the article comprising at least one of a film, a coating, a laminate, glasses, a lens, a ballistic glass, an architecturally shaped window, a hurricane window, an armor, a golf ball, a bowling ball, a rollerblade wheel, a roller-skate wheel, a skate-board wheel, a greenhouse cover, a floor coating, an outdoor coatings, a photovoltaic cell, a face mask, a personal protection gear, and a privacy screen.

20. A method for forming a polyurethane elastomer, comprising:

reacting at least a polyol and an aliphatic diisocyanate to form a prepolymer, and

reacting the prepolymer and a chain extender to form a polyurethane elastomer according to claim 1.

6. A polyurethane elastomer, comprising:

the reaction product of at least a prepolymer and a chain extender, wherein the prepolymer comprises the reaction product of at least a polyol and an aliphatic diisocyanate, the chain extender comprises at least one of a diol or a non-aromatic diamine, and wherein the polyurethane elastomer has at least one of a Shore A hardness of at least 90 at a hard segment content of between about 40 and about 50, a Shore A hardness of at least 85 at a hardsegment content of between about 30 and about 40, and a B ashore Rebound of at least 45%.

10. A polyurethane elastomer, comprising:

the reaction product of at least a prepolymer and a chain extender, wherein the prepolymer comprises the reaction product of at least a polyol and an aliphatic diisocyanate, the chain extender comprises at least one of a diol or a non-aromatic diamine, the aliphatic diisocyanate comprises a mixture of 1,3-bis(isocyanatomethyl)cyclohexane and 1,4-bis(isocyanatomethyl)cyclohexane, and wherein the polyurethane elastomer has a tan δ

of less than about 0.09 at temperatures of at least about 50°

C.

11. The polyurethane elastomer of claim 10, wherein the tan δ

is less than about 0.04.

12. The polyurethane elastomer of claim 10, wherein the polyol comprises a polycaprolactone polyester diol.

13. The polyurethane elastomer of claim 10, wherein the aliphatic diisocyanate comprises a mixture of 1,3-bis(isocyanatomethyl)cyclohexane and 1,4-bis(isocyanatomethyl)cyclohexane.

14. The polyurethane elastomer of claim 13, wherein the aliphatic diisocyanate comprises a mixture of 1,3-bis(isocyanatomethyl)cyclohexane and 1,4-bis(isocyanatomethyl)cyclohexane at a weight ratio of 1,3-bis(isocyanatomethyl)cyclohexane to 1,4-bis(isocyanatomethyl)cyclohexane of about 80:

20 to about 20;

80.

15. The polyurethane elastomer of claim 14, wherein the ratio is about 55:

45 to about 45;

55.

16. The polyurethane elastomer of claim 10, wherein the chain extender comprises 1,4-butanediol.

17. The polyurethane elastomer of claim, 10 wherein the polyurethane elastomer has a Method B compression set is less than about 32%.