Patent US5664533A successfully refreshed from Google Patents.
Patent US4581191A successfully refreshed from Google Patents.
US4581191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of molded articles from polylaurolactam, as well as the resulting molded articles
Assignee: Individual
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Filing: 1984-03-01
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Granted: 1986-04-08
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Expires: 2004-03-01
Abstract
Abstract A polylaurolactam mold is being produced by that a laurolactam melting at first is being mixed with a catalyst and the mixture afterwards being compounded with an activator and polymerized, whereby the polymerizing material is being cast to threads or cords and the reduced material is being injection molded at temperatures of 430° F. to 490° F. and at pressures of 50.10 5 to 100.10 5 Pa, whereby, according to the invention, before the molding 0.1 to 5 wt. % silicon fat is added to the granules. The then resulting molded products, especially protective helmets and protective plates, are distinguished by superior physical properties.
Inventors
- 👤 Werner Hartmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:41
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/06; A42B3/062; A42B3/063; B; B29; B29C; B29C45/00; B29C45/0001; C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08L; C08L77/00; C08L77/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
94 words
Method for the production of molded articles from polylaurolactam in which a laurin lactam melting is at first being mixed with a catalyst and the mixture is afterwards compounded with an activator and polymerized whereby the polymerizing material is being cast to filaments or strands subsequently reduced to granules and the reduced material is being injection molded at temperatures of from 430° to 490° F. and pressures of from 50.10 5 to 100.10 5 Pa, characterized by that before the molding 0.1 to 5 weight % of silicone grease is added to the granules.
Claim 2
Dependent Claim
94 words
Method for the production of molded articles from polylaurolactam in which a laurin lactam melting is at first being mixed with a catalyst and the mixture is afterwards compounded with an activator and polymerized whereby the polymerizing material is being cast to filaments or strands subsequently reduced to granules and the reduced material is being injection molded at temperatures of from 430° to 490° F. and pressures of from 50.10 5 to 100.10 5 Pa, characterized by that before the molding 0.1 to 5 weight % of silicone grease is added to the granules.
Claim 3
Dependent Claim
46 words
Method in accordance with claim 1, characterized by that the addition of silicone grease is performed in such a way that the silicone grease in the first place is mixed with polylaurolactam reduced to a powder, and this mixture then being added to the polylaurolactam granules.
Claim 4
Dependent Claim
25 words
Method in accordance with claim 1 or 2, characterized by the silicone grease being added in an amount of from 0.5 to 1 weight %.
Claim 5
Dependent Claim
23 words
Method in accordance with claims 1, 2 or 3, characterized by that a silicone grease is used containing soaps as the consistency component.
Claim 6
Dependent Claim
26 words
Method in accordance with claims 1, 2, 3 or 4, characterized by that as the silicone grease phenylmethyl silicone oil thickened with soaps is being used.
Claim 7
Dependent Claim
97 words
Molded article from polylaurolactam which has been produced by at first mixing a laurin lactam melting with a catalyst and the mixture afterwards being compounded with an activator and polymerized, whereby the polymerizing material is being cast to filaments or strands and subsequently reduced to granules and the reduced material is injection molded at temperatures of from 430° to 490° F. and pressures of from 50.10 5 to 100.10 5 Pa, characterized by that during the preparation of the polylaurolactam before the molding 0.1 to 5 wt. % of silicone grease has been added to the granules.
Claim 8
Dependent Claim
97 words
Molded article from polylaurolactam which has been produced by at first mixing a laurin lactam melting with a catalyst and the mixture afterwards being compounded with an activator and polymerized, whereby the polymerizing material is being cast to filaments or strands and subsequently reduced to granules and the reduced material is injection molded at temperatures of from 430° to 490° F. and pressures of from 50.10 5 to 100.10 5 Pa, characterized by that during the preparation of the polylaurolactam before the molding 0.1 to 5 wt. % of silicone grease has been added to the granules.
Claim 9
Dependent Claim
31 words
Molded article in accordance with claim 6, characterized by that at its production and before the molding 0.1 to 5 wt. % of silicone grease was added to the polylaurolactam granules.
Claim 10
Dependent Claim
30 words
Molded articles in accordance with claim 6 or 7, characterized by that at its production and before the molding, silicone grease, thickened with soaps, was added to the polylaurolactam granules.
Claim 11
Dependent Claim
17 words
Molded article in accordance with claims 6, 7 or 8 in the shape of a protective helmet.
Claim 12
Dependent Claim
16 words
Molded article in accordance with claims 6, 7 or 8 the shape of a protective plate.
References Cited (Backward Citations)
US3637604A
Cited
GB2096047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |