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US4338246A
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Intumescent flame retardant thermoplastic polymethacrylate compositions
Assignee: Great Lakes Chemical Corp
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Filing: 1981-08-21
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Granted: 1982-07-06
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Expires: 2001-08-21
Abstract
Abstract Thermoplastic polymethacrylate compositions comprising (a) thermoplastic polymethacrylate such as polymethyl methacrylate, a pentate salt of an amino-s-triazine, and optionally a polyol are flame retardant and intumescent and may be compounded to be self-extinguishing.
Inventors
- 👤 Yuval Halpern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:50
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/05; C08K5/053; C08K5/49; C08K5/51; C08K5/52; C08K5/527; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
36 words
Thermoplastic polymethacrylate compositions comprising (a) thermoplastic polymethacrylate, (b) a flame retarding amount of an intumescent additive selected from the group consisting of melammonium pentate, the pentate salt of ammelide, and mixtures thereof, and (c) a polyol.
Claim 2
Dependent Claim
36 words
Thermoplastic polymethacrylate compositions comprising (a) thermoplastic polymethacrylate, (b) a flame retarding amount of an intumescent additive selected from the group consisting of melammonium pentate, the pentate salt of ammelide, and mixtures thereof, and (c) a polyol.
Claim 3
Dependent Claim
25 words
The composition of claim 1 wherein the intumescent additive is present in from about 20 to about 50 percent by weight of the total composition.
Claim 4
Dependent Claim
12 words
The composition of claim 1 wherein the polymethacrylate is poly (methyl methacrylate).
Claim 5
Dependent Claim
11 words
The composition of claim 1 wherein said additive is melammonium pentate.
Claim 6
Dependent Claim
16 words
The composition of claim 1 wherein said additive is melammonium pentate and the polyol is dipentaerythritol.
Claim 7
Independent Claim
58 words
A method for rendering thermoplastic polymethacrylate intumescent and self-extinguishing consisting of compounding therewith from about 20 to about 50 percent by weight based on final composition of an additive selected from the group consisting of melammonium pentate, the pentate salt of ammelide and mixtures thereof, and a polyol selected from the group consisting of pentaerythritol, dipentaerythritol and tripentaerythritol.
Claim 8
Independent Claim
58 words
A method for rendering thermoplastic polymethacrylate intumescent and self-extinguishing consisting of compounding therewith from about 20 to about 50 percent by weight based on final composition of an additive selected from the group consisting of melammonium pentate, the pentate salt of ammelide and mixtures thereof, and a polyol selected from the group consisting of pentaerythritol, dipentaerythritol and tripentaerythritol.
References Cited (Backward Citations)
US4201705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |