US4438236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions of melt-processable polymers having improved processability
Assignee: Imperial Chemical Industries Ltd
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Filing: 1982-06-14
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Granted: 1984-03-20
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Expires: 2002-06-14
Abstract
Abstract A melt-processable composition comprising at least one polymer capable of forming an anisotropic melt and at least one other melt-processable polymer characterized in that the temperature range over which the polymer can form an anisotropic melt overlaps the temperature range over which the melt-processable polymer may be melt processed. The melt viscosity of such compositions may be very much less than that of the melt-processable polymer in the absence of the anisotropic melt-forming polymer particularly at high shear rates, corresponding to those encountered during moulding and extrusion operations. On the other hand at low shear rates and particularly when the concentration of anisotropic melt-forming polymer does not exceed 5% by weight increases in melt viscosity are obtainable which are valuable in fabrication processes operated at low shear rate where retention of form stability is required.
Inventors
- 👤 Frederic N. Cogswell
- 👤 Brian P. Griffin
- 👤 John B. Rose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:45
CPC Classifications
C; C08; C08L; C08L69/00; C08L101/00; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L31/00; C08L31/02; C08L33/00; C08L33/04; C08L33/06; C08L67/00; C08L67/02; C08L77/00; C08L2205/00; C08L2205/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
80 words
A melt-processable polymer composition comprising from 0.5 to 5.0% by weight of the composition of at least one polymer capable of forming an anisotropic melt and at least one other melt-processable polymer characterised in that the temperature range over which the polymer can form an anisotropic melt and the temperature range over which the melt-processable polymer may be melt processed overlap, with the proviso that the other melt-processable polymer may not become melt processable until blended with the anisotropic-melt-forming polymer.
Claim 2
Dependent Claim
80 words
A melt-processable polymer composition comprising from 0.5 to 5.0% by weight of the composition of at least one polymer capable of forming an anisotropic melt and at least one other melt-processable polymer characterised in that the temperature range over which the polymer can form an anisotropic melt and the temperature range over which the melt-processable polymer may be melt processed overlap, with the proviso that the other melt-processable polymer may not become melt processable until blended with the anisotropic-melt-forming polymer.
Claim 3
Dependent Claim
51 words
A melt-processable polymer composition according to claim 1 characterised in that the temperature range over which the polymer which is capable of forming an anisotropic melt is present as an anisotropic melt and the temperature range over which the melt-processable polymer may be melt processed overlap by at least 5° C.
Claim 4
Dependent Claim
90 words
A melt-processable polymer composition according to either of claims 1 or 2 characterised in that the composition contains a sufficient quantity of the polymer capable of forming an anisotropic melt at a temperature within the processing temperature range of the melt-processable polymer to increase the melt viscosity of the composition in comparison with the melt viscosity in the absence of the anisotropic-melt-forming polymer, by at least 10% measured at a shear rate of 10 sec -1 at a given processing temperature in the processing temperature range of the melt-processable polymer.
Claim 5
Dependent Claim
43 words
A melt-processable polymer composition according to claim 1 characterised in that it has been produced by forming a melt from a polymer exhibiting anisotropic melt form and a melt-processable polymer which is molten at the temperature at which the anisotropic melt is formed.
Claim 6
Dependent Claim
31 words
A melt-processable polymer composition according to claim 1 characterised in that the composition is formed from a solution of the melt-processable polymer and the polymer capable of exhibiting an anisotropic melt.
Claim 7
Dependent Claim
76 words
A molten polymer composition characterized in that there coexist in the melt at least two polymers in melt form at least one of which is present in an amount of from 0.5 to 5.0% by weight of the composition and which is an anisotropic melt forming polymer and which acts to increase the melt viscosity of the molten composition compared with the melt viscosity of the composition when said anisotropic melt forming polymer is not present.
Claim 8
Dependent Claim
76 words
A molten polymer composition characterized in that there coexist in the melt at least two polymers in melt form at least one of which is present in an amount of from 0.5 to 5.0% by weight of the composition and which is an anisotropic melt forming polymer and which acts to increase the melt viscosity of the molten composition compared with the melt viscosity of the composition when said anisotropic melt forming polymer is not present.
Claim 9
Independent Claim
68 words
A method of improving the processability of a melt processable polymer comprising forming a blend of from 0.5 to 5.0% by weight of the composition of a melt-processable polymer with a second polymer characterized in that the melt of the second polymer is an anisotropic melt and acts to increase the viscosity of the molten blend in comparison with the composition not containing the anisotropic melt forming material.
Claim 10
Independent Claim
68 words
A method of improving the processability of a melt processable polymer comprising forming a blend of from 0.5 to 5.0% by weight of the composition of a melt-processable polymer with a second polymer characterized in that the melt of the second polymer is an anisotropic melt and acts to increase the viscosity of the molten blend in comparison with the composition not containing the anisotropic melt forming material.
Claim 11
Dependent Claim
66 words
A method of improving the processability of a melt-processable polymer according to claim 7 characterised in that the melt contains sufficient of the anisotropic melt to increase the melt viscosity of the composition by at least 10% (when measured at a shear rate of 10 sec -1 at a temperature at which the composition is molten) in comparison with the composition not containing the anisotropic-melt-forming material.
Claim 12
Dependent Claim
23 words
A melt-processable polymer composition according to claim 3 containing from 2 to 80% by weight of the composition of reinforcing or non-reinforcing fillers.
Claim 13
Dependent Claim
13 words
A shaped article obtained from a molten polymer composition according to claim 6.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |