US3951908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-proofing, high melting point thermoplastic polymers with lactam-impregnated red phosphorus
Assignee: BASF SE
•
Filing: 1974-05-08
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Granted: 1976-04-20
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Expires: 1994-05-08
Abstract
Abstract A process for the production of a high melting point thermoplastic polymer flame-proofed by melt-blending with a lactam-impregnated red phosphorus as the essential retardant at temperatures above 200° C. and the resulting flame-proofed thermoplastic polymer.
Inventors
- 👤 Otto Kaiser
- 👤 Anton Cadus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:55
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/04; C08K3/00; C08K3/02; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
100 words
A composition comprising a high melting point, synthetic thermoplastic polymer selected from the group consisting of polyamides, linear polyesters and polyacetals and red phosphorus evenly incorporated into said polymer in a concentration ranging from 1 to 75% by weight based on the weight of the polymer, said composition being obtained by melt blending and uniformly incorporating into said polymer at a temperature above about 200° C. a lactam-impregnated red phosphorus mixture consisting essentially of from 25 to 90% by weight of particulate red phosphorus and from 10 to 75% by weight of lactam having from 4 to 12 carbon atoms.
Claim 2
Dependent Claim
100 words
A composition comprising a high melting point, synthetic thermoplastic polymer selected from the group consisting of polyamides, linear polyesters and polyacetals and red phosphorus evenly incorporated into said polymer in a concentration ranging from 1 to 75% by weight based on the weight of the polymer, said composition being obtained by melt blending and uniformly incorporating into said polymer at a temperature above about 200° C. a lactam-impregnated red phosphorus mixture consisting essentially of from 25 to 90% by weight of particulate red phosphorus and from 10 to 75% by weight of lactam having from 4 to 12 carbon atoms.
Claim 3
Dependent Claim
26 words
A composition as claimed in claim 1 wherein said polymer is flame-proofed by a content of about 1 to 20% by weight of said red phosphorus.
Claim 4
Dependent Claim
27 words
A composition as claimed in claim 1 wherein said polymer is a masterbatch with a content of about 20 to 75% by weight of said red phosphorus.
Claim 5
Dependent Claim
22 words
A composition as claimed in claim 1 wherein the red phosphorus has a particle size of between about 0.01 and 0.15 mm.
Claim 6
Dependent Claim
94 words
A process for the manufacture of a high melting point, synthetic thermoplastic polymer selected from the group consisting of polyamides, linear polyesters and polyacetals which is flame-proofed with red phosphorus, which comprises impregnating a particulate red phosphorus with a lactam having from 4 to 12 carbon atoms to provide a mixture consisting essentially of from 25 to 90% by weight of red phosphorus and from 10 to 75% by weight of said lactam, and melt blending and uniformly incorporating said lactam/red phosphorus mixture into the thermoplastic polymer at a temperature of above about 200°C.
Claim 7
Dependent Claim
94 words
A process for the manufacture of a high melting point, synthetic thermoplastic polymer selected from the group consisting of polyamides, linear polyesters and polyacetals which is flame-proofed with red phosphorus, which comprises impregnating a particulate red phosphorus with a lactam having from 4 to 12 carbon atoms to provide a mixture consisting essentially of from 25 to 90% by weight of red phosphorus and from 10 to 75% by weight of said lactam, and melt blending and uniformly incorporating said lactam/red phosphorus mixture into the thermoplastic polymer at a temperature of above about 200°C.
Claim 8
Dependent Claim
31 words
A process as claimed in claim 5 wherein said lactam/red phosphorus mixture is melt blended and uniformly incorporated into said thermoplastic polymer at a temperature of about 200° to 300° C.
Claim 9
Dependent Claim
30 words
A process as claimed in claim 5, wherein the lactam is at least partially recovered by distillation during or after incorporation of the lactam/red phosphorus mixture into the thermoplastic polymer.
Claim 10
Dependent Claim
30 words
A process as claimed in claim 5, wherein the lactam/red phosphorus mixture contains 50 to 80% by weight of red phosphorus and from 50 to 20% by weight of lactam.
Claim 11
Dependent Claim
12 words
A process as claimed in claim 5, wherein the lactam is caprolactam.
Claim 12
Dependent Claim
16 words
A process as claimed in claim 5, wherein the synthetic thermoplastic polymer is a linear polyamide.
Claim 13
Dependent Claim
16 words
A process as claimed in claim 5, wherein the synthetic thermoplastic polymer is a linear polyester.
References Cited (Backward Citations)
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Cited
US3496133A
Cited
GB1147009A
Cited
GB1157419A
Cited
US3560430A
Cited
US3663174A
Cited
US3694402A
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US3808127A
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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) | 1979-04-20 | 1979-10-20 | 1980-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-20 | 1983-10-20 | 1984-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-20 | 1987-10-20 | 1988-04-20 | $7700.00 | Window Closed / Lapsed |