Patent US4221874A successfully refreshed from Google Patents.
US4221874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phospholane oxide containing polymers
Assignee: Monsanto Co
•
Filing: 1978-06-07
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Granted: 1980-09-09
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Expires: 1998-06-07
Abstract
Abstract The present invention relates to a process for the improvement of the flame retardant properties of a polymer composition which comprises incorporating therein an effective flame retardant amount of a halogenated phospholane oxide. The resultant products are useful as rigid or flexible foams and shaped articles having greatly improved flame retardant and smoke suppressant properties. The use of the halogenated phospholane oxide also imparts stability to the products, thus overcoming difficulties encountered with volatile phosphorus compounds which had been used heretofore with polymeric compositions such as polyurethanes.
Inventors
- 👤 Kurt Moedritzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:20
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0038; C08K; C08K5/00; C08K5/36; C08K5/48; C08K5/49; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/906
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
A process for the improvement of the flame retardant properties of a polyurethane polymer composition which comprises incorporating therein an effective flame retardant amount ranging from greater than 5% up to about 50% by weight, based on the weight of the final modified polymer, of a compound of the formula ##STR2## where X is chlorine or bromine; m is a number from 2 to 4; Y is oxygen or sulfur; and R is an alkyl, aryl, alkoxy or aryloxy group of 1 to 10 carbon atoms.
Claim 2
Dependent Claim
86 words
A process for the improvement of the flame retardant properties of a polyurethane polymer composition which comprises incorporating therein an effective flame retardant amount ranging from greater than 5% up to about 50% by weight, based on the weight of the final modified polymer, of a compound of the formula ##STR2## where X is chlorine or bromine; m is a number from 2 to 4; Y is oxygen or sulfur; and R is an alkyl, aryl, alkoxy or aryloxy group of 1 to 10 carbon atoms.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said compound is 1-phenyl-3,4-dibromo phospholane-1-oxide.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein said compound is 1-phenyl-2,3-dibromo phospholane-1-oxide.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein said compound is 1-methyl-3,4-dibromo phospholane-1-oxide.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein said compound is 1-methyl-2,3-dibromo phospholane-1-oxide.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein said compound is 1-phenyl-2,3-dichloro phospholane-1-oxide.
Claim 8
Dependent Claim
30 words
The process of claim 1 wherein said compound is 1-methyl-3,4-dibromo phospholane-1-oxide and in which said compound is incorporated at a level of about 6% by weight in a polyurethane foam.
Claim 9
Dependent Claim
30 words
The process of claim 1 wherein said compound is 1-phenoxy-2,3-dibromo phospholane-1-oxide and in which said compound is incorporated at a level of about 6% by weight in a polyurethane foam.
Claim 10
Dependent Claim
30 words
The process of claim 1 wherein said compound is 1-phenyl-2,3-dichloro phospholane-1-oxide and in which said compound is incorporated at a level of about 7% by weight in a polyurethane foam.
Claim 11
Dependent Claim
19 words
The process of claim 1 in which the compound is selected from the group consisting of 1-alkyl-dihalo-phospholane-1-oxides and 1-aryl-dihalo-phospholane-1-oxides.
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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) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |