US4624970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foaming system for rigid urethane and isocyanurate foams based on polyethers and aromatic polyester polyols
Assignee: Honeywell International Inc
•
Filing: 1985-05-16
•
Granted: 1986-11-25
•
Expires: 2005-05-16
Abstract
Abstract Improved fluorocarbon blowing agents composed of blends of (a) CFC-11, trichlorofluoromethane, with (b) CFC-123 or CFC-123a, dichlorotrifluoroethane, have been found which impart significant improvement in the solubility characteristics of rigid urethane foam systems that contain significant amounts of aromatic polyester polyols. A substantial increase in the solubility of the CFC-11/CFC-123 or CFC-11/CFC-123a blends over CFC-11 alone in typical rigid urethane foam premix systems containing variable concentrations or aromatic polyester polyol is obtained. Preparation of rigid urethane foams have shown that improved solubility CFC-11 blends with CFC-123 or CFC-123a permit an increase in the amount of aromatic polyester polyol than can be used in the formulation without any significant differences in the physical characteristics of foams compared to those produced from CFC-11 without inclusion of aromatic polyester polyols.
Inventors
- 👤 Frank J. Dwyer
- 👤 Leon M. Zwolinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:06
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/4018; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/005; C08G2115/00; C08G2115/02; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
A mixture comprising a foamable polyurethane-forming composition reactive with polyisocyanate comprising from about 20 percent to about 80 percent by weight of an aromatic polyester polyol based on the total polyol composition and from about 80 percent to about 20 percent of a polyether polyol, with a fluorocarbon blowing agent comprising a blend of at least one isomer of dichlorotrifluoroethane and trichlorofluoromethane in a ratio of the dichlorotrifluoroethane to trichlorofluoromethane of from about 1:9 to about 3:7 and wherein the total blowing agent is present in amounts of from about 2 to 40 parts by weight based on the weight of the polyol.
Claim 2
Dependent Claim
103 words
A mixture comprising a foamable polyurethane-forming composition reactive with polyisocyanate comprising from about 20 percent to about 80 percent by weight of an aromatic polyester polyol based on the total polyol composition and from about 80 percent to about 20 percent of a polyether polyol, with a fluorocarbon blowing agent comprising a blend of at least one isomer of dichlorotrifluoroethane and trichlorofluoromethane in a ratio of the dichlorotrifluoroethane to trichlorofluoromethane of from about 1:9 to about 3:7 and wherein the total blowing agent is present in amounts of from about 2 to 40 parts by weight based on the weight of the polyol.
Claim 3
Dependent Claim
25 words
The mixture of claim 1 wherein the aromatic polyester polyol is present in amounts of from about 30 weight percent to about 80 weight percent.
Claim 4
Dependent Claim
22 words
The mixture of claim 1 wherein the aromatic polyester polyol is present in amounts of about 40 to about 50 weight percent.
Claim 5
Dependent Claim
17 words
The mixture of claim 1 wherein the blowing agent blend is in a ratio of about 1:4.
Claim 6
Dependent Claim
12 words
The mixture of claim 1 wherein the blowing agent incorporates a stabilizer.
Claim 7
Dependent Claim
18 words
A rigid polyurethane foam forming composition comprising the reaction product of the mixture of claim 1 with polyisocyanate.
Claim 8
Independent Claim
105 words
A method of producing a rigid polyurethane foam article employing trichlorofluoromethane blowing agent having enhanced solubility in aromatic polyester polyols which comprises: (a) blending dichlorodifluoromethane with the trichlorofluoromethane in a ratio of about 1:9 to about 3:7, and in admixture with a foamable urethane composition of about 20 to about 80 percent aromatic polyester polyol, the balance being polyether polyol; (b) combining said mixture with a reaction promoting catalyst and emulsifier to provide a premix; and (c) mixing the required amount of the above resultant premix with the required amount of isocyanate-containing component to produce a rigid foam article in rigid urethane foam production equipment.
Claim 9
Independent Claim
105 words
A method of producing a rigid polyurethane foam article employing trichlorofluoromethane blowing agent having enhanced solubility in aromatic polyester polyols which comprises: (a) blending dichlorodifluoromethane with the trichlorofluoromethane in a ratio of about 1:9 to about 3:7, and in admixture with a foamable urethane composition of about 20 to about 80 percent aromatic polyester polyol, the balance being polyether polyol; (b) combining said mixture with a reaction promoting catalyst and emulsifier to provide a premix; and (c) mixing the required amount of the above resultant premix with the required amount of isocyanate-containing component to produce a rigid foam article in rigid urethane foam production equipment.
Claim 10
Dependent Claim
24 words
The method of claim 7 wherein the foamable polyurethane comprises a premix component containing: a blend of 90% trichlorofluoromethane with 10% of a dichlorodifluoromethane.
Claim 11
Dependent Claim
46 words
The method of claim 7 wherein the foamable urethane mixture comprises a blend of 60% aromatic polyester polyol with 40% of a conventional rigid urethane foam polyether polyol; and (a) a catalyst selected from the group of amine and/or metallic catalysts; and (b) a silicone emulsifier.
Claim 12
Dependent Claim
38 words
The method of claim 7 wherein the isocyanate containing component is selected from the group consisting of pure or crude toluene diisocyanates, polymethylene polyphenyl isocyanate, or blends of such isocyanates and isocyanate terminated prepolymers made from such isocyanates.
References Cited (Backward Citations)
US4076644A
Cited
US4048104A
Cited
US4177332A
Cited
US4223068A
Cited
US4417001A
Cited
US4529744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |