US4255219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making composite laminated polyamide sheet material
Assignee: Honeywell International Inc
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Filing: 1978-08-28
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Granted: 1981-03-10
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Expires: 1998-08-28
Abstract
Abstract A thermoplastic sheet material useful in forming multilayer composites, said sheet material being formed of at least one layer comprising polyepsiloncaprolactam and about 0.05 to 1 percent by weight, based upon the weight of the polyepsiloncaprolactam, of a dibasic carboxylic acid or anhydride or esters thereof and at least one reinforcing mat of long glass fibers encased within said layer.
Inventors
- 👤 Michael P. Dellavecchia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:36
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/50; B29C70/504; B29C70/506; B32B27/18; B32B27/20; B32B27/34; B32B37/00; B32B37/14; B32B37/15; B32B37/153; B32B5/00; B32B5/02; B32B5/022; C; C08; C08J; C08J5/00; C08J5/04; C08J5/0405; C08J5/043; C08J2377/00; C08J2377/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31623; Y10T442/00; Y10T442/60; Y10T442/674
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
107 words
In a process for providing a composite laminated sheet material comprising the steps of forming a first layer comprising polyepsiloncaprolactam, forming a second reinforcing layer of thermoplastic resin and laminating said layers together while said resin is still in molten condition, the improvement comprising utilizing as said reinforcing layer a sheet material capable of being laminated immediately after extrusion and being formed of at least one layer comprising polyepsiloncaprolactam and about 0.05 to 1% by weight, based upon the weight of the polyepsiloncaprolactam, of a dibasic carboxylic acid or anhydride or ester thereof and at least one reinforcing mat of long glass fibers encased within said layer.
Claim 2
Dependent Claim
107 words
In a process for providing a composite laminated sheet material comprising the steps of forming a first layer comprising polyepsiloncaprolactam, forming a second reinforcing layer of thermoplastic resin and laminating said layers together while said resin is still in molten condition, the improvement comprising utilizing as said reinforcing layer a sheet material capable of being laminated immediately after extrusion and being formed of at least one layer comprising polyepsiloncaprolactam and about 0.05 to 1% by weight, based upon the weight of the polyepsiloncaprolactam, of a dibasic carboxylic acid or anhydride or ester thereof and at least one reinforcing mat of long glass fibers encased within said layer.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein an additional layer comprising polyepsiloncaprolactam is laminated to said reinforcing layer.
Claim 4
Dependent Claim
119 words
A process of forming a smooth-surfaced composite laminated sheet material comprising the steps of (a) extruding a first sheet comprising about 40 to 70 weight percent of polyepsiloncaprolactam, about 0 to 35 weight percent of short glass fibers and about 0 to 50 weight percent of a particulate filler; (b) extruding a second sheet comprising polyepsiloncaprolactam and about 0.05 to 1 percent by weight, based on the weight of the polyepsiloncaprolactam, of a dibasic carboxylic acid; and (c) feeding said first and second sheets and a long glass fiber mat into the nip of a set of laminating rolls whereby said glass mat is impregnated into said second sheet and said second sheet is bonded to said first sheet.
Claim 5
Dependent Claim
119 words
A process of forming a smooth-surfaced composite laminated sheet material comprising the steps of (a) extruding a first sheet comprising about 40 to 70 weight percent of polyepsiloncaprolactam, about 0 to 35 weight percent of short glass fibers and about 0 to 50 weight percent of a particulate filler; (b) extruding a second sheet comprising polyepsiloncaprolactam and about 0.05 to 1 percent by weight, based on the weight of the polyepsiloncaprolactam, of a dibasic carboxylic acid; and (c) feeding said first and second sheets and a long glass fiber mat into the nip of a set of laminating rolls whereby said glass mat is impregnated into said second sheet and said second sheet is bonded to said first sheet.
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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) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |