US4271273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigid isocyanurate polyurethane foams and method for preparing same
Assignee: GAF Chemicals Corp
•
Filing: 1979-06-25
•
Granted: 1981-06-02
•
Expires: 1999-06-25
Abstract
Abstract Rigid isocyanurate urethane polymers useful for insulation purposes and characterized by superior thermal stability are prepared by reacting an excess of polymeric isocyanate with butenediol in the presence of blowing agent and catalyst.
Inventors
- 👤 Jerome B. Biranowski
- 👤 Donald H. Lorenz
- 👤 Simon W. Kantor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:08
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/675; C08G2115/00; C08G2115/02; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
69 words
Thermally stable, rigid cellular isocyanurate polyurethane foam comprising the post cured reaction product of reacting in the presence of a blowing agent and trimerization catalyst: (a) polyol comprising at least about 14 wt% 2-butene,-1,4-diol; and (b) aromatic polyisocyanate in an amount such that the active hydrogen groups present in the polyol are less than 50% of the number of isocyanate groups present in the polyisocyanate of the reaction mixture.
Claim 2
Dependent Claim
69 words
Thermally stable, rigid cellular isocyanurate polyurethane foam comprising the post cured reaction product of reacting in the presence of a blowing agent and trimerization catalyst: (a) polyol comprising at least about 14 wt% 2-butene,-1,4-diol; and (b) aromatic polyisocyanate in an amount such that the active hydrogen groups present in the polyol are less than 50% of the number of isocyanate groups present in the polyisocyanate of the reaction mixture.
Claim 3
Dependent Claim
17 words
Rigid foam according to claim 1 wherein the polyisocyanate comprises at least about 50% polymethylene polyphenyl polyisocyanate.
Claim 4
Dependent Claim
24 words
Rigid foam according to claim 2 wherein the average isocyanate functionality of the polyisocyanate is in the range between about 2.25 and about 3.2.
Claim 5
Dependent Claim
24 words
Rigid foam according to claim 1 which also includes silicone surfactant in an amount between about 1 and about 2 wt% based on isocyanate.
Claim 6
Dependent Claim
12 words
Rigid foam according to claim 1 wherein the blowing agent is trichlorofluoromethane.
Claim 7
Dependent Claim
26 words
Rigid foam according to claim 1 wherein the proportion of isocyanate groups to hydroxyl groups is between about 2 to 1 and about 8 to 1.
Claim 8
Dependent Claim
77 words
Process for preparing a thermally stable, rigid cellular isocyanurate polyurethane foam which comprises reacting in the presence of a blowing agent and trimerization catalyst: (a) polyol comprising at least about 14 wt% 2-butene,-1,4-diol; and (b) aromatic polyisocyanate in an amount such that the active hydrogen groups present in the polyol are less than 50% of the number of isocyanate groups present in the polyisocyanate of the reaction mixture, and subjecting the resulting reaction mixture to post curing.
Claim 9
Dependent Claim
77 words
Process for preparing a thermally stable, rigid cellular isocyanurate polyurethane foam which comprises reacting in the presence of a blowing agent and trimerization catalyst: (a) polyol comprising at least about 14 wt% 2-butene,-1,4-diol; and (b) aromatic polyisocyanate in an amount such that the active hydrogen groups present in the polyol are less than 50% of the number of isocyanate groups present in the polyisocyanate of the reaction mixture, and subjecting the resulting reaction mixture to post curing.
Claim 10
Dependent Claim
15 words
Process according to claim 7 wherein the polyisocyanate comprises at least 50% polymethylene polyphenyl polyisocyanate.
Claim 11
Dependent Claim
24 words
Process according to claim 8 wherein the average isocyanate functionality of the polyisocyanate is in the range of between about 2.25 and about 2.2.
Claim 12
Dependent Claim
19 words
Process according to claim 7 wherein the blowing agent comprises trichlorofluoromethane and the trimerization catalyst comprises tertiary amine catalyst.
Claim 13
Dependent Claim
23 words
Process according to claim 7 wherein silicone surfactant is present in an amount between about 1 and about 2 wt% based on isocyanate.
References Cited (Backward Citations)
US3737400A
Cited
US3810851A
Cited
US3928256A
Cited
US4002580A
Cited
US4094869A
Cited
US4025469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-01 | 1984-12-01 | 1985-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-01 | 1988-12-01 | 1989-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-01 | 1992-12-01 | 1993-06-02 | $7700.00 | Window Closed / Lapsed |