Rigid, dimensionally stable polyurethane foams and a process for the production of such foams in which the foam pressure is reduced

• US 6,831,110 B2
• Filed: 04/01/2003
• Issued: 12/14/2004
• Est. Priority Date: 04/01/2003
• Status: Expired due to Fees

• Current Assignee: Covestro LLC (Covestro AG)
• Original Assignee: Bayer Healthcare LLC (Bayer AG)
• Inventors: Ingold, Kerry A., Yourd, Raymond A.
• Primary Examiner(s): COONEY, JOHN M
• Application Number:
  US10/404,572
• Publication Number:
  US 20040198856A1
• Time in Patent Office: 623 Days
• Field of Search: 521/128, 521/129, 521/130, 521/167, 521/170, 521/174
• US Class Current: 521/128
• CPC Class Codes: C08G 18/482 Mixtures of polyethers containing at least one polyether containing nitrogen
• CPC Class Codes: C08G 2110/0025 rigid
• CPC Class Codes: C08G 2110/005 < 50kg/m3
• CPC Class Codes: C08G 2110/0083 prepared using water as the sole blowing agent
• CPC Class Codes: C08J 2205/10 Rigid foams
• CPC Class Codes: C08J 2375/04 Polyurethanes
• CPC Class Codes: C08J 9/14 organic

Abstract

Rigid foams are made by reacting a polyisocyanate with an isocyanate-reactive composition which includes at least one isocyanate-reactive compound, preferably, an amine-initiated polyol and more preferably, an amine-initiated polyether polyol and a second, different polyol in the presence of a blowing agent composition which includes water and a catalyst composition which includes two different blowing catalysts, preferably, pentamethyldiethylenetriamine and bis(2-dimethylamino-ethyl)ether.

Claims

1. A process for the production of a rigid dimensionally stable polyurethane foam comprising reacting

a) an organic isocyanate

with

b) an isocyanate-reactive compound

in the presence of

c) a blowing agent comprising water and

d) a catalyst composition comprising at least two different blowing catalysts in which the catalyst composition comprises pentamethyldiethylene triamine and bis(2-dimethylaminoethyl)ether.

2. The process of claim 1 in which the catalyst composition includes from about 0.02 to about 1.0 parts by weight of each of the blowing catalysts.

3. The process of claim 1 in which the catalyst composition comprises from about 0.2 to about 0.3 parts by weight of each blowing catalyst.

4. The process of claim 1 in which b) comprises an amine-initiated polyol.

5. The process of claim 4 in which b) further comprises a second polyether or a polyester polyol.

6. The process of claim 1 in which blowing agent mixture c) further comprises a hydrocarbon, an HCFC, an HFC or a combination thereof.

7. The process of claim 1 in which up to 7% by weight, based on the total weight of b)+c)+d), of water is included in blowing agent c).

8. The process of claim 1 in which the amine-initiated polyol is an o-toluenediamine-initiated polyether polyol.

9. The process of claim 1 in which the isocyanate reactive compound is a polyether polyol and a polyester polyol.

11. A rigid polyurethane foam produced by the process of claim 1.

13. A water heater insulated with the foam of claim 11.

10. A process for the production of a rigid, dimensionally stable polyurethane foam comprising reacting

a) an organic isocyanate

with

b) an isocyanate-reactive composition comprising an amine-initiated polyol and a second isocyanate-reactive compound

in the presence of

c) a blowing agent comprising water and

d) a catalyst composition comprising pentamethyldiethylene triamine and bis(2-dimethylaminoethyl) ether.

12. A rigid polyurethane foam produced by the process of claim 10.

14. A water heater insulated with the foam of claim 12.