US4257931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant poly(butylene terephthalate) compositions comprising melamine pyrophosphate and a phosphonate
Assignee: Wyeth Holdings LLC
•
Filing: 1980-01-29
•
Granted: 1981-03-24
•
Expires: 2000-01-29
Abstract
Abstract Flame retardant poly(butyleneterephthalate) composiitions are prepared by incorporating into the polymer a combination of a pentaerythrityl phosphonate and melamine pyrophosphate.
Inventors
- 👤 Albrecht H. Granzow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:08
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3467; C08K5/3477; C08K5/3492; C08K5/34928; C08K5/49; C08K5/51; C08K5/53; C08K5/5317; C08K5/5333; C08K5/5357
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
50 words
A method of flame retarding a poly( 1,4-butylene terephthalate) polymer comprising incorporating therewith an effective flame retardant amount of a combination of (A), a pentaerythrityl phosphonate of Formula (I) ##STR8## wherein R is selected from --CN, --CH 3 , ##STR9## wherein y is 0 to 4, and (B), melamine pyrophosphate.
Claim 2
Independent Claim
50 words
A method of flame retarding a poly( 1,4-butylene terephthalate) polymer comprising incorporating therewith an effective flame retardant amount of a combination of (A), a pentaerythrityl phosphonate of Formula (I) ##STR8## wherein R is selected from --CN, --CH 3 , ##STR9## wherein y is 0 to 4, and (B), melamine pyrophosphate.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein the flame retardant amount of (A) and (B) is from about 25 to 40% by weight of the composition.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein the weight ratio of (A):(B) is from about 5:1 to 1:5.
Claim 5
Dependent Claim
9 words
The method of claim 1 wherein R is ##STR10##
Claim 6
Dependent Claim
9 words
The method of claim 1 wherein R is ##STR11##
Claim 7
Dependent Claim
9 words
The method of claim 1 wherein R is ##STR12##
Claim 8
Dependent Claim
11 words
The method of claim 1 wherein R is --CH 3 .
Claim 9
Dependent Claim
9 words
The method of claim 1 wherein R is ##STR13##
Claim 10
Dependent Claim
17 words
The method of claim 1 wherein the weight ratio of (A):(B) is from about 1:1 to 1:3.
Claim 11
Dependent Claim
14 words
The method of claim 1 wherein the weight ratio of (A):(B) is essentially 1:1.
Claim 12
Dependent Claim
22 words
The compositions produced by the method of any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10.
References Cited (Backward Citations)
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US2779691A
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US2685581A
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US3635970A
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US3866405A
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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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |