US4584149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing self-extinguishing formed thermo-plastic bodies based on polycaprolactam
Assignee: Consiglio Nazionale delle Richerche
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Filing: 1984-06-11
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Granted: 1986-04-22
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Expires: 2004-06-11
Abstract
Abstract A process for preparing self-extinguishing formed thermoplastic bodies based on polycaprolactam, which consists in polymerizing, by anionic way, in suitable molds epsilon -caprolactam, by previously incorporating into said epsilon -caprolactam a flame-retardant and optionally at least a known coadjuvant substance, said flame-retardant being composed of red phosphorus powder micro-encapsulated in a synthetic resin, preferably in a melamine resin.
Inventors
- 👤 Giovanni C. Alfonso
- 👤 Saverio Russo
- 👤 Enrico Pedemonte
- 👤 Antonio Turturro
- 👤 Concetto Puglisi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:37
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08K3/00; C08K3/02; Y; Y10; Y10S; Y10S264/00; Y10S264/61
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
A process for preparing self-extinguishing shaped thermoplastic bodies comprising poly-caprolactam and red phosphorus, which process comprises preparing at first a mixture consisting of 80 to 99% of molten ε-caprolactam monomer and 1-20% of red phosphorus powder, said powder being in the form of microparticles encapsulated in a synthetic resin shaping the mixture into said shaped body, and then causing the anionic polymerization of said monomer to occur.
Claim 2
Dependent Claim
67 words
A process for preparing self-extinguishing shaped thermoplastic bodies comprising poly-caprolactam and red phosphorus, which process comprises preparing at first a mixture consisting of 80 to 99% of molten ε-caprolactam monomer and 1-20% of red phosphorus powder, said powder being in the form of microparticles encapsulated in a synthetic resin shaping the mixture into said shaped body, and then causing the anionic polymerization of said monomer to occur.
Claim 3
Dependent Claim
179 words
The process according to claim 1, which comprises: (a) preparing a mixture consisting of 80-99% by weight of ε-caprolactam in the molten state and 1-20% by weight of red phosphorus powder, said powder being in the form of microparticles encapsulated in a synthetic resin, which microparticles consist of at least 80% by weight of particles having sizes below 10 μm; (b) adding to said mixture 0.2-1% by moles relative to ε-caprolactam of an anionic initiator, and causing the reaction between the initiator and the ε-caprolactam to occur at a temperature ranging from 90° to 110° C., said initiator being selected from the group consisting of metal-Na and LiH; (c) adding to said warm mixture 0.2-1% by moles relative to ε-caprolactam of a polymerization activator consisting of N-acetyl-caprolactam, thus obtaining an additioned monomeric mass ready for polymerization; (d) causing a polymerization reaction of said mass to occur while maintaining said mass at a temperature between 150° and 160° C. for a time ranging from 3 to 15 minutes, said polymerization reaction being accomplished in a shaped cavity of a mold.
Claim 4
Dependent Claim
40 words
The process according to claim 2, in which also at least a coadjuvating substance selected from the group consisting of flame-retarding synergistic agents, reinforcing fillers, pigments, dyes, nucleating agents, antistatic agents, antioxidants, stabilizers is furthermore incorporated into said molten ε-caprolactam.
Claim 5
Dependent Claim
16 words
The process according to claim 3, in which said coadjuvating substance consists of reinforcing glass fibers.
Claim 6
Dependent Claim
48 words
The process according to claim 1 in which said microencapsulated red phosphorus powder is incorporated and dispersed, in the mass of molten ε-caprolactam, which is formed into flakes or granules consisting of about 50% (by weight) of said powder and of about 50% (by weight) of solid ε-caprolactam.
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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) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |