Patent US2962531A successfully refreshed from Google Patents.
US4170508A
Expired / Lapsed
US
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Process for making self-extinguishing laminates
Assignee: Hoechst AG
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Filing: 1978-06-27
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Granted: 1979-10-09
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Expires: 1998-06-27
Abstract
Abstract Self-extinguishing laminates are made by an improved process, wherein individual layers of a carrier material are impregnated with a thermosetting phenolic resin containing a flame-retardant agent and the impregnated layers are placed one above another and bonded together by compressing them at elevated temperature and under elevated pressure to give a hardened laminate. More specifically, finely pulverulent phosphorus pentanitride as a flame-retarding agent is dispersed in the plasticized or non-plasticized thermosetting phenolic resin, with or without a diluent; the phenolic resin, based on its solid matter content, and the phosphorus pentanitride being used in an approximate ratio by weight of 100:4 to 100:15; and the phenolic resin, based on its solid matter content, and the carrier being used in an approximate ratio by weight of 100:80 to 100:150.
Inventors
- 👤 Joachim Wortmann
- 👤 Burkhard Schonrogge
- 👤 Joseph Cremer
- 👤 Franz-Josef Dany
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:54
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/18; B32B29/00; B32B29/002; B32B29/005; B32B27/06; B32B27/08; B32B27/10; B32B27/12; B32B27/42; B32B5/00; B32B5/22; B32B5/24; B32B5/26; C; C08; C08K; C08K3/00; C08K3/32; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0373; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/023; B32B2260/028; B32B2260/04; B32B2260/046; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/3065; B32B2317/00; B32B2317/12; B32B2317/122; B32B2361/00; B32B2457/00; B32B2457/08; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/012; H05K2201/02; H05K2201/0275; H05K2201/0284; H05K2201/0293
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
126 words
In a process for making a self-extinguishing synthetic resin laminate, wherein individual layers of a carrier material are impregnated with a thermosetting phenolic resin containing a flame-retardant agent and the impregnated layers are placed one above another and bonded together by compressing them at elevated temperature and under elevated pressure to give a hardened laminate, the improvement which comprises: dispersing finely pulverulent phosphorus pentanitride as a flame-retarding agent in the plasticized or non-plasticized thermosetting phenolic resin; the phenolic resin, based on its solid matter content, and the phosphorus pentanitride being used in an approximate ratio by weight of 100:4 to 100:15; and the phenolic resin, based on its solid matter content, and the carrier being used in an approximate ratio by weight of 100:80 to 100:150.
Claim 2
Dependent Claim
126 words
In a process for making a self-extinguishing synthetic resin laminate, wherein individual layers of a carrier material are impregnated with a thermosetting phenolic resin containing a flame-retardant agent and the impregnated layers are placed one above another and bonded together by compressing them at elevated temperature and under elevated pressure to give a hardened laminate, the improvement which comprises: dispersing finely pulverulent phosphorus pentanitride as a flame-retarding agent in the plasticized or non-plasticized thermosetting phenolic resin; the phenolic resin, based on its solid matter content, and the phosphorus pentanitride being used in an approximate ratio by weight of 100:4 to 100:15; and the phenolic resin, based on its solid matter content, and the carrier being used in an approximate ratio by weight of 100:80 to 100:150.
Claim 3
Dependent Claim
24 words
The process as claimed in claim 1, wherein the phenolic resin is a plasticized or non-plasticized thermosetting phenolic resol based on a synthetic phenol.
Claim 4
Dependent Claim
21 words
The process as claimed in claim 1, wherein the phenolic resin is diluted with methanol, ethanol, acetone, toluene or another solvent.
Claim 5
Dependent Claim
34 words
The process as claimed in claim 1, wherein the phenolic resin and phosphorus pentanitride are used in a ratio by weight of 100:6 to 100:10, based on the solid matter content of the resin.
Claim 6
Dependent Claim
33 words
The process as claimed in claim 1, wherein the phenolic resin and carrier are used in a ratio by weight of 100:100 to 100:130, based on the solid matter content of the resin.
Claim 7
Dependent Claim
20 words
The process as claimed in claim 1, wherein the carrier comprises cotton cellulose paper, sodium kraft paper or cotton fabric.
Claim 8
Dependent Claim
20 words
The process as claimed in claim 1, wherein the carrier is preimpregnated with a phenolic resin free from flame-retardant agent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |