US3821130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air frothed polyurethane foams
Assignee: Dow Chemical Co
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Filing: 1973-05-18
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Granted: 1974-06-28
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Expires: 1993-05-18
Abstract
Abstract Flexible polyurethane foams are prepared from inert gas frothed mixtures of (1) a polyether polyol end-capped with at least 2 moles of ethylene oxide per OH group, (2) an isocyanate containing prepolymer and (3) a catalyst for urethane formation.
Inventors
- 👤 B Barron
- 👤 J Dunlap
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:46
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/30; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/4841; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/0058; C08G2110/0066; C08G2110/0083; C08G2150/00; C08G2150/60; C08J2375/00; C08J2375/04; C08J2375/08; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/07; Y10S264/17
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
58 words
a polyisocyanate-containing material selected from the group consisting of a. an isocyanate terminated prepolymer resulting from the reaction of an organic diisocyanate with a compound having from 2 to 4 hydroxyl groups per molecule and an OH equivalent weight of from about 53 to about 1,000, b. polymeric polyisocyanates, c. crude aromatic diisocyanates and d. mixtures thereof, and
Claim 2
Dependent Claim
56 words
The composition of claim 1 wherein component (1) contains from about 80 to about 95 parts by weight of (a) and from about 5 to about 20 parts by weight of (b) and wherein components (1) and (2) are present in quantities so as to provide an NCO:OH ratio of from about 1.0:1 to about 1.2:1.
Claim 3
Dependent Claim
27 words
a catalyst for urethane formation, wherein (1) and (2) are employed in quantities so as to provide an NCO:OH ratio of from about 0.85:1 to about 2.0:1.
Claim 4
Dependent Claim
99 words
The foam of claim 2 wherein component (1a) is the reaction product of glycerine with propylene oxide subsequently endcapped with 2-6 moles of ethylene oxide per hydroxyl group and having an OH equivalent weight of about 1,500 to about 1,800; component (1b) is diethylene glycol and component (2) a prepolymer resulting from the reaction of an excess of toluene diisocyanate with a polyether polyol that is the reaction product of glycerine with propylene oxide in a mole ratio of about 3 moles of propylene oxide per mole of glYcerine, and having about 30 percent by weight free NCO groups.
Claim 5
Dependent Claim
68 words
A process for preparing the flexible polyurethane foams of claim 1 which comprises mechanically inducing a substance which is in the gaseous state at standard temperature and pressure, in the absence of a cell control agent, into a mixture comprising the composition of claim 1, thereby producing a froth which is dispensed into a suitable container or onto a suitable substrate wherein or whereupon the froth is cured.
Claim 6
Dependent Claim
14 words
The process of claim 4 wherein said froth is dispensed onto a suitable substrate.
Claim 7
Dependent Claim
16 words
The process of claim 4 wherein the NCO:OH ratio is from about 1.0:1 to about 1.2:1.
Claim 8
Dependent Claim
85 words
A process for preparing the polyurethane foams of claim 1 wherein a froth is prepared by mechanically inducing a substance which is in its gaseous state at standard conditions of temperature and pressure into a mixture of all the components comprising the foam composition of claim 1 except the catalyst for urethane formation and thereafter mixing the resultant froth with said catalyst in a suitable mixer, dispensing the resultant froth-catalyst mixture into a suitable container or onto a suitable substrate and curing said froth-catalyst mixture.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |