Patent US3717609A successfully refreshed from Google Patents.
US3717609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant polymers
Assignee: Hercules LLC
•
Filing: 1971-05-06
•
Granted: 1973-02-20
•
Expires: 1991-05-06
Abstract
Abstract Polyolefins based on propylene are made flame retardant by the addition of about 0.1 to 2 percent by weight of a dialkyltin mercaptoester and 0.1 to 2 percent by weight of an aromaticaliphatic ether having at least one bromophenoxy linkage to an aliphatic radical and having at least three bromine substituents on each aromatic ring.
Inventors
- 👤 A Kutner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:13
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/06; C08K5/56; C08K5/57; C08K5/58
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
83 words
A flame retardant polymer composition comprising: a. about 96 to 99.8 percent by weight of a stereo-regular polymer of propylene; b. about 0.1 to 2 percent by weight of dialkyltin mercaptoester having the general formula where R1, R2, R3, and R4 are the same or different alkyl groups having 1 to 18 carbon atoms and R5 and R6 are the same or different alkylene groups having 1 to 17 carbon atoms; and c. about 0.1 to 2 percent by weight of 1,4-bis (2,4,6-tribromophenoxy)-2,3-dibromo-trans-butene-2.
Claim 2
Dependent Claim
83 words
A flame retardant polymer composition comprising: a. about 96 to 99.8 percent by weight of a stereo-regular polymer of propylene; b. about 0.1 to 2 percent by weight of dialkyltin mercaptoester having the general formula where R1, R2, R3, and R4 are the same or different alkyl groups having 1 to 18 carbon atoms and R5 and R6 are the same or different alkylene groups having 1 to 17 carbon atoms; and c. about 0.1 to 2 percent by weight of 1,4-bis (2,4,6-tribromophenoxy)-2,3-dibromo-trans-butene-2.
Claim 3
Dependent Claim
12 words
A composition according to claim 1 where the dialkyltin mercaptoester is dibutyltin-S,S''-bis(n-butylmercaptopropionate).
References Cited (Backward Citations)
US3075944A
Cited
US3250739A
Cited
US3282882A
Cited
US3372141A
Cited
US3368916A
Cited
US3400174A
Cited
US3666692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |