US4980388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of carbon dioxide adducts as blowing agents in cellular and microcellular polyureas
Assignee: Dow Chemical Co
•
Filing: 1988-10-17
•
Granted: 1990-12-25
•
Expires: 2008-10-17
Abstract
Abstract A polyurea foam is formed from a reaction mixture comprising at least one polyisocyanate component and an active hydrogen component, wherein active hydrogen compounds of relatively high equivalent weight have an average of about 1.5 to about 10 active hydrogen-containing groups per molecule, of which active hydrogen-containing groups: an average of (a) from about 5 to about 60 percent are primary or secondary aliphatic amine groups or (b) at least about 25 percent are primary aromatic, Lewis acid-blocked primary aliphatic, secondary aliphatic or aromatic amine groups or mixtures thereof. Carbon dioxide is adducted to said active hydrogen component. The adduct releases carbon dioxide to blow the foam.
Inventors
- 👤 Ronald M. Herrington
- 👤 Robert B. Turner
- 👤 James R. Porter
- 👤 Ralph D. Priester, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:23
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3225; C08G18/3253; C08G18/3259; C08G18/3265; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5024; C08G18/503; C08G2110/00; C08G2110/0008; C08G2110/0025; C08G2110/0041; C08G2110/0083; C08J2375/00; C08J2375/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
137 words
A process of preparing a polyurea foam by reacting in the substantial absence of ammonium carbamates, a reaction mixture containing at least one polyisocyanate component and an active hydrogen component, wherein active hydrogen compounds of relatively high equivalent weight have an average of about 1.5 to about 10 active hydrogen-containing groups per molecule, of which active hydrogen-containing groups: an average of (a) from about 5 to about 60 percent are primary or secondary aliphatic amine groups or (b) at least about 25 percent are primary aromatic amine groups; Lewis acid-blocked primary aliphatic, secondary aliphatic or aromatic amine groups; or mixtures of such groups; said relatively high equivalent weight active hydrogen compounds having adducted thereto sufficient carbon dioxide to produce the foam having a preselected density and wherein the resulting adducted carbon dioxide functions as a blowing agent.
Claim 2
Dependent Claim
137 words
A process of preparing a polyurea foam by reacting in the substantial absence of ammonium carbamates, a reaction mixture containing at least one polyisocyanate component and an active hydrogen component, wherein active hydrogen compounds of relatively high equivalent weight have an average of about 1.5 to about 10 active hydrogen-containing groups per molecule, of which active hydrogen-containing groups: an average of (a) from about 5 to about 60 percent are primary or secondary aliphatic amine groups or (b) at least about 25 percent are primary aromatic amine groups; Lewis acid-blocked primary aliphatic, secondary aliphatic or aromatic amine groups; or mixtures of such groups; said relatively high equivalent weight active hydrogen compounds having adducted thereto sufficient carbon dioxide to produce the foam having a preselected density and wherein the resulting adducted carbon dioxide functions as a blowing agent.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein there is additionally present in the reaction mixture at least one chain extender or crosslinker.
Claim 4
Dependent Claim
19 words
The process of claim 2 wherein at least one chain extender or crosslinker is also adducted with carbon dioxide.
Claim 5
Dependent Claim
23 words
The process of claim 2 wherein the chain extender or crosslinker is an alkanolamine having an equivalent weight of less than about 200.
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein, of the active hydrogen-containing groups, at least about 25 percent are primary or secondary aromatic amine groups.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein, of the active hydrogen-containing groups, at least about 25 percent are secondary aliphatic amine groups.
Claim 8
Dependent Claim
24 words
The process of claim 1 wherein, of the active hydrogen-containing groups, at least about 25 percent are Lewis acid blocked primary aliphatic amine groups.
Claim 9
Dependent Claim
23 words
The process of claim 1 wherein, of the active hydrogen-containing groups, from about 5 to about 60 percent are primary aliphatic amine groups.
Claim 10
Dependent Claim
20 words
The process of claim 1 wherein the amine groups are adducted with carbon dioxide in the substantial absence of water.
Claim 11
Dependent Claim
12 words
The process of claim 1 wherein an auxiliary blowing agent is used.
Claim 12
Dependent Claim
25 words
The process of claim 10 wherein the auxiliary blowing agent is selected from the group consisting of water, halogen substituted alkanes, chlorofluorocarbons and mixtures thereof.
Claim 13
Dependent Claim
31 words
The process of claim 1 wherein the foam is a flexible or rigid foam and the density is preselected to be from about 0.5 to about 40 pounds per cubic foot.
Claim 14
Dependent Claim
29 words
The process of claim 12 wherein the foam is a flexible foam and the density is preselected to be from about 1 to about 4 pounds per cubic foot.
Claim 15
Dependent Claim
29 words
The process of claim 12 wherein the foam is a rigid foam and the density is preselected to be from about 2 to about 40 pounds per cubic foot.
Claim 16
Dependent Claim
12 words
The process of claim 1 wherein no auxiliary blowing agent is used.
References Cited (Backward Citations)
US2855384A
Cited
US3256213A
Cited
US3499872A
Cited
US3425964A
Cited
DE1570571A1
Cited
US3789027A
Cited
US3607837A
Cited
US3635908A
Cited
US3714047A
Cited
GB1339356A
Cited
US3868350A
Cited
US3834578A
Cited
US3971785A
Cited
US3864402A
Cited
US3980594A
Cited
US4077920A
Cited
US4136241A
Cited
US4102801A
Cited
US4292226A
Cited
US4297442A
Cited
US4282330A
Cited
US4284728A
Cited
US4532266A
Cited
US4417002A
Cited
US4525590A
Cited
US4469856A
Cited
US4506039A
Cited
US4467089A
Cited
US4542214A
Cited
US4499038A
Cited
US4500656A
Cited
US4520042A
Cited
US4645630A
Cited
EP0145250A1
Cited
US4517313A
Cited
US4725636A
Cited
US4735970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-24 | 1994-06-25 | 1994-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-24 | 1998-06-25 | 1998-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-24 | 2002-06-25 | 2002-12-25 | $7700.00 | Window Closed / Lapsed |