US4923660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of mouldings and films from thermotropic polymers
Assignee: Individual
•
Filing: 1988-03-25
•
Granted: 1990-05-08
•
Expires: 2008-03-25
Abstract
Abstract By processing fibres and filaments of thermotropic polymers from anisotropic melt, films and mouldings having predeterminable properties are formed.
Inventors
- 👤 Bernd Willenberg
- 👤 Aziz El Sayed
- 👤 Harry Rohr
- 👤 Hans-Rudolf Dicke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:42
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4209; D04H1/4218; B; B29; B29C; B29C43/00; B29C43/006; B29C67/00; B29C67/24; D04H1/4234; D04H1/4242; D04H1/4326; D04H1/4334; D04H1/4342; D04H1/54; D04H1/542; D04H1/55; D04H3/00; D04H3/002; D04H3/004; D04H3/005; D04H3/009; D04H3/011; D04H3/08; D04H3/14; B29K; B29K2105/00; B29K2105/0079; B29K2105/06; B29K2105/08; B29K2105/25; B29K2995/00; B29K2995/0037; B29K2995/0044; B29K2995/005; B29L; B29L2007/00; B29L2007/002
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
66 words
A process for the production of films and mouldings from a sheet-like structure of thermotropic polymer fiber or filaments, comprising precompacting the sheet-like structure at a temperature below the melting point of the thermotropic polymer to substantially eliminate cavities between the fibers or filaments within the sheet-like structure, heating said sheet-like structure to obtain an anisotropic melt, followed by compacting and cooling of the sheet-like structure.
Claim 2
Dependent Claim
66 words
A process for the production of films and mouldings from a sheet-like structure of thermotropic polymer fiber or filaments, comprising precompacting the sheet-like structure at a temperature below the melting point of the thermotropic polymer to substantially eliminate cavities between the fibers or filaments within the sheet-like structure, heating said sheet-like structure to obtain an anisotropic melt, followed by compacting and cooling of the sheet-like structure.
Claim 3
Dependent Claim
23 words
Process according to claim 1 wherein the heating of said structure is carried out under a pressure of from 1.1 to 1,500 bar.
Claim 4
Dependent Claim
18 words
Process according to claim 1, wherein the fibers or filaments are arranged undirectionally to give a sheet-like structure.
Claim 5
Dependent Claim
24 words
Process according to claim 1, characterized in the fibers or filaments are arranged crosswise at an angle of 90° to give a sheet-like structure.
Claim 6
Dependent Claim
21 words
Process according to claim 1, wherein the fibers or filaments in a plane are at an angle of 30° to 90°.
Claim 7
Dependent Claim
18 words
Process according to claim 1, wherein the fibers or filaments in an area are laid in random directions.
Claim 8
Dependent Claim
21 words
Process according to claim 1, wherein the fibers or filaments are used in the form of tapes, woven fabrics and nonwovens.
Claim 9
Dependent Claim
18 words
Process according to claim 1, wherein the fibers or filaments are used in the form of knitted fabrics.
Claim 10
Dependent Claim
34 words
Process according to claim 1 wherein up to 50% by weight of the fibers of filaments employed are of a material selected from the group consisting of non-thermotropic thermoplastics, glass, aramide, carbon and metal.
Claim 11
Dependent Claim
35 words
The process of claim 1 wherein said precompacting is carried out at a temperature between 10° and 100° C. below the melting temperature of the thermotropic polymer at a pressure between 10 and 500 bar.
References Cited (Backward Citations)
US2433727A
Cited
US3231650A
Cited
FR2279875A1
Cited
GB1452654A
Cited
US4284757A
Cited
EP0084456A2
Cited
EP0116845A2
Cited
EP0126845A1
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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) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |