US3755212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air blown polyurethane foams
Assignee: Dow Chemical Co
•
Filing: 1971-05-13
•
Granted: 1973-08-28
•
Expires: 1991-05-13
Abstract
Abstract Air blown polyurethane foams having densities below 15 lbs/ft3 are prepared from ester-modified polyether polyols, a polyisocyanate and a catalyst for urethane formation, in the absence of a cell control agent.
Inventors
- 👤 J Dunlap
- 👤 D Parrish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:08
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4887
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
51 words
The composition of claim 1 wherein the quantity of (1a) is from about 80 to about 95 parts by weight and (1b) is from about 5 to about 20 parts by weight, the quantity of (2) is from about 1.0 to about 1.2 NCO equivalents per active hydrogen equivalent in (1).
Claim 2
Dependent Claim
24 words
a polyisocyanate in a quantity so as to provide from about 0.85 to about 2.0 NCO groups per active hydrogen atom in (1), and
Claim 3
Dependent Claim
3 words
a polyisocyanate, and
Claim 4
Dependent Claim
16 words
a catalyst for urethane formation, thereby producing a froth which is dispensed into a suitable container.
Claim 5
Dependent Claim
5 words
a catalyst for urethane formation.
Claim 6
Dependent Claim
34 words
The composition of claim 2 wherein said residue of an initiator A has an active hydrogen equivalent weight of from about 400 to about 2,500 and a functionality of from 2 to about 4.
Claim 7
Dependent Claim
18 words
The composition of claim 3 wherein Z is the residue of maleic anhydride, phthalic anhydride and suicinic anhydride.
Claim 8
Dependent Claim
13 words
The composition of claim 4 wherein the polyisocyanate component (2) is toluene diisocyanate.
Claim 9
Dependent Claim
11 words
The composition of claim 5 wherein component 1b is diethylene glycol.
Claim 10
Dependent Claim
35 words
A process for preparing polyurethane foams which comprises mechanically inducing a compound which is in the gaseous state at standard temperature and pressure, in the absence of a cell control agent, into a mixture comprising
Claim 11
Dependent Claim
51 words
The process of claim 7 wherein the quantity of (a) is from about 80 to about 95 parts by weight and (b) is from about 5 to about 20 parts by weight, the quantity of (2) is from about 1.0 to about 1.2 NCO equivalents per active hydrogen equivalent in (1).
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Cited
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Cited
US3639542A
Cited
US3639541A
Cited
US3574167A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |