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US5288842A
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Morphological composite materials formed from different precursors
Assignee: International Business Machines Corp
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Filing: 1991-01-30
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Granted: 1994-02-22
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Expires: 2011-01-30
Abstract
Abstract A method of producing a multiphase polymer is disclosed whereby the phases have the same chemical structure but have different morphological states and thus different properties. This is achieved by forming a mixture of precursors of the polymer, at least one of the precursors having a reaction rate higher than the other precursor or precursors in the mixture. The precursor having the highest reaction rate is then converted to obtain a composite of a polymer and the precursors that are not polymerized. This mixture might also be formed by mixing a soluble polymer with its precursor. The polymer/precursor composite is processed to obtain the structure having different morphological states by either choosing the reaction conditions to convert the unconverted different morphological states by either choosing the reaction conditions to convert the unconverted precursors such that the obtained polymer differs in it morphology/ properties from the first obtained polymer or by applying stress to the composite and then converting the still unreacted precursor or precursors in the composite such that different morphological states are obtained.
Inventors
- 👤 Claudius Feger
- 👤 Rodney T. Hodgson
- 👤 David A. Lewis
- 👤 Ravi Saraf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:04
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/701; C08G18/72; C08G18/80; C08G18/8061; C08G18/807; C08G18/8074; C08J; C08J5/00; C08L; C08L101/00; C08L79/00; C08L79/04; C08L79/08; C08G2250/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31551; Y10T428/31609; Y10T428/31612; Y10T428/31721; Y10T428/31855
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
174 words
A method of preparing a polymer composite comprising an integral structure having a continuous phase and at least one discontinuous phase, said discontinuous phase being constituted by a multiplicity of separated domains, said continuous phase and said discontinuous phase each consisting essentially of polymeric material of the same chemical constitution, said continuous and discontinuous phases exhibiting a different morphological characteristic, said method comprising: (a) forming a mixture of reactant precursors to said polymeric material, at least one of said precursors having a reaction rate higher than the other precursor or precursors in said mixture; (b) reacting said precursor having the highest reaction rate under conditions effective to obtain a composite comprising a continuous-polymer phase and a discontinuous phase of unreacted precursors; (c) simultaneously or sequentially applying compressive or tensile stress to said composite effective to improve the ultimate tensile strength of said composite; and (d) simultaneously or subsequently to application of said stress to said composite, reacting said unreacted precursors in said discontinuous phase under conditions effective to convert said precursors to polymeric material.
Claim 2
Independent Claim
174 words
A method of preparing a polymer composite comprising an integral structure having a continuous phase and at least one discontinuous phase, said discontinuous phase being constituted by a multiplicity of separated domains, said continuous phase and said discontinuous phase each consisting essentially of polymeric material of the same chemical constitution, said continuous and discontinuous phases exhibiting a different morphological characteristic, said method comprising: (a) forming a mixture of reactant precursors to said polymeric material, at least one of said precursors having a reaction rate higher than the other precursor or precursors in said mixture; (b) reacting said precursor having the highest reaction rate under conditions effective to obtain a composite comprising a continuous-polymer phase and a discontinuous phase of unreacted precursors; (c) simultaneously or sequentially applying compressive or tensile stress to said composite effective to improve the ultimate tensile strength of said composite; and (d) simultaneously or subsequently to application of said stress to said composite, reacting said unreacted precursors in said discontinuous phase under conditions effective to convert said precursors to polymeric material.
Claim 3
Dependent Claim
18 words
The method of claim 1 where said stress comprises tensile stress applied along substantially one axis of orientation.
Claim 4
Dependent Claim
18 words
The method of claim 1 where said stress comprises tensile stress applied along substantially one axis of orientation.
Claim 5
Dependent Claim
47 words
The method of claim 1 where said stress comprises tensile stress applied along substantially one axis of orientation as to each precursor that is reacted and further, the axis of orientation of each sequential application of stress is at an angle to the other axes of orientation.
Claim 6
Dependent Claim
13 words
The method of claim 3 where the axes of orientation are substantially planar.
Claim 7
Dependent Claim
13 words
The method of claim 4 where the axes of orientation are substantially planar.
Claim 8
Dependent Claim
27 words
The method of claim 6 where said stress is applied to provide a biaxially-oriented, multiphase structure wherein each phase of polymeric material exhibits a different morphological characteristic.
Claim 9
Dependent Claim
12 words
The method of claim 4 wherein said multiphase structure is a film.
Claim 10
Dependent Claim
20 words
The method of claim 1 wherein said polymer is a polyimide, phenolic resin, epoxy resin, polyurethane or a semi-crystalline polystyrene.
Claim 11
Dependent Claim
39 words
The method of claim 9 wherein part of said polyimide precursor is a step-reaction polymer precursor partially esterified with a monofunctional organic hydroxy compound to obtain a precursor having a reaction rate different from said other precursor or precursors.
Claim 12
Dependent Claim
23 words
The method of claim 10 wherein the ratio of said precursors to one another is on a 1:1 molar basis ± about 95%.
Claim 13
Dependent Claim
12 words
The method of claim 1 wherein said precursor is a polyimide precursor.
Claim 14
Dependent Claim
55 words
The method of claim 12 wherein said precursor is a polyamic acid ester of polyamic acid and a low molecular weight monofunctional organic hydroxy compound or (b) a polyamic acid salt of polyamic acid and a low molecular weight amine to obtain a precursor having a reaction rate different from said other precursor or precursors.
Claim 15
Dependent Claim
56 words
The method of claim 2 wherein said polymer precursor is a polyamic acid ester of polyamic acid and a low molecular weight monofunctional organic hydroxy compound or (b) a polyamic acid salt of polyamic acid and a low molecular weight amine to obtain a precursor having a reaction rate different from said other precursor or precursors.
Claim 16
Dependent Claim
56 words
The method of claim 3 wherein said polymer precursor is a polyamic acid ester of polyamic acid and a low molecular weight monofunctional organic hydroxy compound or (b) a polyamic acid salt of polyamic acid and a low molecular weight amine to obtain a precursor having a reaction rate different from said other precursor or precursors.
Claim 17
Dependent Claim
56 words
The method of claim 4 wherein said polymer precursor is a polyamic acid ester of polyamic acid and a low molecular weight monofunctional organic hydroxy compound or (b) a polyamic acid slat of polyamic acid and a low molecular weight amine to obtain a precursor having a reaction rate different from said other precursor or precursors.
Claim 18
Dependent Claim
56 words
The method of claim 5 wherein said polymer precursor is a polyamic acid ester of polyamic acid and a low molecular weight monofunctional organic hydroxy compound or (b) a polyamic acid slat of polyamic acid and a low molecular weight amine to obtain a precursor having a reaction rate different from said other precursor or precursors.
Claim 19
Dependent Claim
16 words
The method of claim 17 wherein said multiphase structure having different morphological characteristics comprises a film.
Claim 20
Dependent Claim
16 words
The method of claim 17 wherein said multiphase structure having different morphological characteristics comprises a fiber.
Claim 21
Dependent Claim
9 words
A product produced by the method of claim 1.
Claim 22
Dependent Claim
49 words
A polymer composite comprising an integral structure having a continuous phase and at least one discontinuous phase, said discontinuous phase being constituted phase and said discontinuous phase each consisting essentially of polymeric material of substantially the same chemical constitution, said continuous and discontinuous phases exhibiting a different crystallinity characteristic.
Claim 23
Dependent Claim
49 words
A polymer composite comprising an integral structure having a continuous phase and at least one discontinuous phase, said discontinuous phase being constituted phase and said discontinuous phase each consisting essentially of polymeric material of substantially the same chemical constitution, said continuous and discontinuous phases exhibiting a different crystallinity characteristic.
Claim 24
Dependent Claim
13 words
The polymer composite of claim 21 where said polymeric material is a polyimide.
Claim 25
Dependent Claim
14 words
The polymer composite of claim 21 where said polymeric material is a phenolic polymer.
Claim 26
Dependent Claim
14 words
The polymer composite of claim 21 where said polymeric material is an epoxy polymer.
Claim 27
Dependent Claim
13 words
The polymer composite of claim 21 where said polymeric material is a polyurethane.
Claim 28
Dependent Claim
14 words
The polymer composite of claim 21 where said polymeric material is a semi-crystalline polystyrene.
Claim 29
Dependent Claim
11 words
The composite of claim 21, oriented in at least one dimension.
Claim 30
Dependent Claim
18 words
The polymer composite of claim 27 wherein each phase has the same degree of crystallinity but different morphology.
Claim 31
Dependent Claim
9 words
A film formed of the composite of claim 27.
Claim 32
Dependent Claim
12 words
A laminate of two or more of the composites of claim 21.
Claim 33
Dependent Claim
10 words
A gas separation membrane comprising the composite of claim 29.
Claim 34
Dependent Claim
21 words
The composite of claim 21 in the form of an oriented fiber constituted from a low thermal coefficient of expansion polyimide.
Claim 35
Dependent Claim
10 words
A printed circuit board comprising the composite of claim 32.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 7.5 Years (Year 8) | 2001-02-21 | 2001-08-23 | 2002-02-22 | $3760.00 | Window Closed / Lapsed |
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