US3939124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire-retardant polyurethane resins prepared from side-chain halogenated aromatic polyisocyanates
Assignee: KAY-FRIES Inc
•
Filing: 1974-09-09
•
Granted: 1976-02-17
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Expires: 1994-09-09
Abstract
Abstract Polyurethanes are made fire-retardant by including in the reaction mixture aromatic polyisocyanates having halogen-containing side chains.
Inventors
- 👤 Eugene P. DiBella
- 👤 Bernard Rudner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:05
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/773
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A fire-retardant polyurethane resin that comprises the reaction product of a polyisocyanate component containing from about 30% to 80% by weight of a side-chain halogenated aromatic polyisocyanate selected from the group consisting of 2,4-diisocyanatobenzotrichloride, 2,6-diisocyanatobenzotrichloride, and mixtures thereof and a polyol having at least two active hydrogen atoms selected from the group consisting of polyether polyols, polyester polyols, and mixtures thereof.
Claim 2
Dependent Claim
61 words
A fire-retardant polyurethane resin that comprises the reaction product of a polyisocyanate component containing from about 30% to 80% by weight of a side-chain halogenated aromatic polyisocyanate selected from the group consisting of 2,4-diisocyanatobenzotrichloride, 2,6-diisocyanatobenzotrichloride, and mixtures thereof and a polyol having at least two active hydrogen atoms selected from the group consisting of polyether polyols, polyester polyols, and mixtures thereof.
Claim 3
Dependent Claim
36 words
A fire-retardant polyurethane resin as defined in claim 1 wherein the polyisocyanate component contains from 20% to 70% by weight of a polyisocyanate selected from the group consisting of 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, and mixtures thereof.
Claim 4
Dependent Claim
15 words
A fire-retardant polyurethane resin as defined in claim 1 wherein the polyol is a polyether.
Claim 5
Dependent Claim
50 words
A fire-retardant polyurethane resin as defined in claim 1 wherein the polyisocyanate component contains equimolar amounts of (a) a side-chain halogenated polyisocyanate selected from the group consisting of 2,4-diisocyanatobenzotrichloride, 2,6-diisocyanatobenzotrichloride, and mixtures thereof and (b) a polyisocyanate selected from the group consisting of 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, and mixtures thereof.
Claim 6
Dependent Claim
36 words
A fire-retardant polyurethane resin as defined in claim 1 wherein the polyisocyanate component comprises from 30% to 80% by weight of a mixture of diisocyanatobenzotrichlorides containing about 80% of the 2,4-isomer and 20% of the 2,6-isomer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |