EP0133355A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Clear oriented polyester material
Assignee: BTG International Ltd
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Filing: 1984-07-25
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Granted: —
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Expires: 2004-07-25
Abstract
Abstract A process for the preparation of clear, oriented polyester material, which process comprises providing an orientable thermoplastic workpiece of the polyester material, heated to a temperature from 55°C to 110°C, at the entry side of a reducing die; and deforming the workpiece by passage through the die in the solid phase at a nominal deformation ratio of at least 2 : 1.
Inventors
- 👤 Ian Macmillan Ward
- 👤 Alan Selwood
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 11:29
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/22; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/78; B29C48/80; B29C48/83; B29C48/832; B29C48/86; B29C48/865; B29C55/30; B29K; B29K2067/00
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
61 words
A process for the preparation of clear, oriented polyester material, which process comprises providing an orientable thermoplastic workpiece of the polyester material, at a temperature from 55 0 C to 1100C, at the entry side of a reducing die; and deforming the workpiece by passage through the die in the solid phase at a nominal deformation ratio of at least 2:1.
Claim 2
Dependent Claim
61 words
A process for the preparation of clear, oriented polyester material, which process comprises providing an orientable thermoplastic workpiece of the polyester material, at a temperature from 55 0 C to 1100C, at the entry side of a reducing die; and deforming the workpiece by passage through the die in the solid phase at a nominal deformation ratio of at least 2:1.
Claim 3
Dependent Claim
61 words
A process for the preparation of oriented polyester material, which process comprises providing an orientable thermoplastic workpiece of the polyester material, at a temperature from 55 0 C to below 100°C, at the entry side of a reducing die; and deforming the workpiece by passage through the die in the solid phase at a nominal deformation ratio of at least 2:1.
Claim 4
Dependent Claim
61 words
A process for the preparation of oriented polyester material, which process comprises providing an orientable thermoplastic workpiece of the polyester material, at a temperature from 55 0 C to below 100°C, at the entry side of a reducing die; and deforming the workpiece by passage through the die in the solid phase at a nominal deformation ratio of at least 2:1.
Claim 5
Dependent Claim
19 words
A process according to Claim 1 or 2 wherein the polyester comprises residues of at least one polyhydric alcohol.
Claim 6
Dependent Claim
22 words
A process according to Claim 3 wherein the polyester comprises residues of at least one linear C 2 to C 6 diol.
Claim 7
Dependent Claim
18 words
A process according to any preceding claim wherein the polyester comprises residues of at least one polycarboxylic acid.
Claim 8
Dependent Claim
18 words
A process according to Claim 5 wherein the polyester comprises residues of at least one aromatic dicarboxylic acid.
Claim 9
Dependent Claim
17 words
A process according to any preceding claim wherein the orientable thermoplastic workpiece is essentially unoriented before deformation.
Claim 10
Dependent Claim
21 words
A process according to any preceding claim wherein the orientable thermoplastic workpiece is heated to a temperature from 70°C to 80°C.
Claim 11
Dependent Claim
20 words
A process according to any preceding claim wherein the reducing die is heated to a temperature from 60°C to 90°C.
Claim 12
Dependent Claim
21 words
A process according to any preceding claim wherein the oriented polyester material passes through a heated sleeve downstream from the die.
Claim 13
Dependent Claim
17 words
A process according to Claim 10 wherein the heated sleeve provides a temperature from 60°C to 160°C.
Claim 14
Dependent Claim
19 words
A process according to any of Claims 1 to 11 wherein the deformation is effected by a tensile process.
Claim 15
Dependent Claim
55 words
A process according to Claim 12 wherein the deformation is effected by applying to the workpiece from the exit side of the die a draw tension insufficient to cause tensile failure of the deforming workpiece; and drawing the workpiece through the die in the solid phase at a nominal deformation ratio of at least 2:1.
Claim 16
Dependent Claim
18 words
A process according to Claim 13 wherein the draw speed is greater than 50 cm min 1 .
Claim 17
Dependent Claim
11 words
A process according to Claim 13 or 14 which is continuous.
Claim 18
Dependent Claim
38 words
A process according to Claim 15 wherein the upstream end of a discrete workpiece being deformed in accordance with Claim 13 or 14 is welded to the downstream end of continuous stock of the same polyester and cross-section.
Claim 19
Dependent Claim
16 words
A process according to Claim 15 or 16 wherein the workpiece is continuously formed in situ.
Claim 20
Dependent Claim
16 words
A process according to any preceding claim wherein the workpiece is a filament, film or tube.
Claim 21
Dependent Claim
20 words
A clear oriented homo- or copolyester material which has been deformed by passage through a die in the solid phase.
Claim 22
Dependent Claim
20 words
A clear oriented homo- or copolyester material which has been deformed by passage through a die in the solid phase.
Claim 23
Dependent Claim
14 words
An oriented polyester material according to Claim 19 which is a film or tube.
References Cited (Backward Citations)
No citation records indexed.
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