US4419308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing porous, film-like or fibrous structure of aromatic polyester
Assignee: Teijin Ltd
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Filing: 1983-03-28
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Granted: 1983-12-06
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Expires: 2003-03-28
Abstract
Abstract A process for producing a porous, film-like or fibrous structure of an aromatic polyester, which comprises (1) forming a substantially non-oriented film-like or fibrous structure by melt-molding an aromatic polyester blend composed of (A) an aromatic polyester containing an aromatic dicarboxylic acid as a main acid component and an aliphatic diol and/or an alicyclic diol as a main glycol component, and (B) at least one low-molecular-weight compound selected from the group consisting of imide compounds and isocyanurate compounds being compatible, but substantially non-reactive, with the aromatic polyester and having a molecular weight of not more than 1,000, the amount of the low-molecular-weight compound being present in an amount of 10 to 300 parts by weight per 100 parts by weight of the aromatic polyester, and (2) extracting at least a major part of the low-molecular-weight compound from the resulting substantially non-oriented film-like or fibrous structure with an organic solvent which can dissolve the low-molecular-weight compound but under the extracting conditions does not substantially dissolve the aromatic polyester.
Inventors
- 👤 Shunichi Matsumura
- 👤 Hiroo Inata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:08
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/26; B; B01; B01D; B01D67/00; B01D67/0002; B01D67/0023; B01D67/0025; B01D67/0027; B01D71/00; B01D71/06; B01D71/48; C08K; C08K5/00; C08K5/16; C08K5/34; C08J2367/00; C08J2367/02
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
164 words
A process for producing a porous, film-like or fibrous structure of an aromatic polyester, which comprises (1) forming a substantially non-oriented film-like or fibrous structure by melt-molding an aromatic polyester blend composed of (A) an aromatic polyester containing an aromatic dicarboxylic acid as a main acid component and an aliphatic diol and/or an alicyclic diol as a main glycol component, and (B) at least one low-molecular-weight compound selected from the group consisting of imide compounds and isocyanurate compounds being compatible, but substantially non-reactive, with the aromatic polyester and having a molecular weight of not more than 1,000, the low-molecular-weight compound being present in an amount of 10 to 300 parts by weight per 100 parts by weight of the aromatic polyester, and (2) extracting at least a major part of the low-molecular-weight compound from the resulting substantially non-oriented film-like or fibrous structure with an organic solvent which can dissolve the low-molecular-weight compound but under the extracting conditions does not substantially dissolve the aromatic polyester.
Claim 2
Dependent Claim
164 words
A process for producing a porous, film-like or fibrous structure of an aromatic polyester, which comprises (1) forming a substantially non-oriented film-like or fibrous structure by melt-molding an aromatic polyester blend composed of (A) an aromatic polyester containing an aromatic dicarboxylic acid as a main acid component and an aliphatic diol and/or an alicyclic diol as a main glycol component, and (B) at least one low-molecular-weight compound selected from the group consisting of imide compounds and isocyanurate compounds being compatible, but substantially non-reactive, with the aromatic polyester and having a molecular weight of not more than 1,000, the low-molecular-weight compound being present in an amount of 10 to 300 parts by weight per 100 parts by weight of the aromatic polyester, and (2) extracting at least a major part of the low-molecular-weight compound from the resulting substantially non-oriented film-like or fibrous structure with an organic solvent which can dissolve the low-molecular-weight compound but under the extracting conditions does not substantially dissolve the aromatic polyester.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein after the extracting treatment, the film-like or fibrous structure is stretched and/or heat-treated.
Claim 4
Dependent Claim
43 words
The process of claim 1 or 2 wherein the aromatic polyester has an intrinsic viscosity, measured at 35° C. in a mixed solution consisting of 60 parts by weight of phenol and 40 parts by weight of tetrachloroethane, of at least about 0.5.
Claim 5
Dependent Claim
43 words
The process of claim 1 or 2 wherein the aromatic polyester has an intrinsic viscosity, measured at 35° C. in a mixed solution consisting of 60 parts by weight of phenol and 40 parts by weight of tetrachloroethane, of at least about 0.6.
Claim 6
Dependent Claim
84 words
The process of claim 1 wherein the imide compound is a compound represented by the following formula ##STR8## wherein A 1 represents a divalent aromatic group or a divalent linear or cyclic aliphatic group, each of which may be substituted, R 1 represents an aromatic group having a valence of n or a linear or cyclic aliphatic group having a valence of n, each of which may be substituted, and n is 1 or 2, provided that the imide ring is 5- or 6-membered.
Claim 7
Dependent Claim
23 words
The process of claim 5 wherein at least one of A 1 and R 1 is said aromatic group which may be substituted.
Claim 8
Dependent Claim
57 words
The process of claim 1 wherein the imide compound is a compound represented by the following formula ##STR9## wherein A 2 represents a tetravalent aromatic group which may be substituted, and R 2 represents a monovalent linear or cyclic aliphatic group which may be substituted, provided that the imide ring in the formula is 5- or 6-membered.
Claim 9
Dependent Claim
16 words
The process of claim 7 wherein R 2 is a monovalent linear or cyclic aliphatic group.
Claim 10
Dependent Claim
26 words
The process of claim 1 wherein the isocyanurate compound is a compound represented by the following formula ##STR10## wherein R 3 is a monovalent alkyl group.
Claim 11
Dependent Claim
18 words
The process of claim 1 wherein the low-molecular-weight compound has a molecular weight of not more than 800.
Claim 12
Dependent Claim
18 words
The process of claim 1 wherein the low-molecular-weight compound has a melting point of at least 100° C.
Claim 13
Dependent Claim
21 words
The process of claim 1 wherein the low-molecular-weight compound has a boiling point of at least 200° C. at atmospheric pressure.
Claim 14
Dependent Claim
28 words
The process of claim 1 wherein the amount of the low-molecular-weight compound is 15 to 250 parts by weight per 100 parts by weight of the aromatic polyester.
Claim 15
Dependent Claim
28 words
The process of claim 1 wherein the amount of the low-molecular-weight compound is 20 to 200 parts by weight per 100 parts by weight of the aromatic polyester.
Claim 16
Dependent Claim
22 words
The process of claim 1 wherein the film-like structure to be extracted has a thickness of not more than about 1 mm.
Claim 17
Dependent Claim
22 words
The process of claim 15 wherein the film-like structure to be extracted has a thickness of about 1 to about 500 microns.
Claim 18
Dependent Claim
41 words
The process of claim 1 wherein the fibrous structure to be extracted is a solid fibrous structure having a diameter of not more than about 1 mm or a hollow fibrous structure having a thickness of not more than 0.5 mm.
Claim 19
Dependent Claim
41 words
The process of claim 17 wherein the fibrous structure to be extracted is a solid fibrous structure having a diameter of about 3 to about 400 microns, or a hollow fibrous structure having an inside diameter of 0.05 to 2 mm.
Claim 20
Dependent Claim
33 words
The process of claim 1 wherein the organic solvent used in the extraction is liquid at ambient temperature and has a boiling point of not more than about 200° C. at atmospheric pressure.
Claim 21
Dependent Claim
58 words
The process of claim 1 or 19 wherein the organic solvent is an aromatic hydrocarbon having 6 to 9 carbon atoms, a halogenated aliphatic hydrocarbon having 1 or 2 carbon atoms, an aliphatic ketone or ester having 3 to 6 carbon atoms, a 5- or 6-membered cyclic ether, or an aliphatic alcohol having 1 to 3 carbon atoms.
Claim 22
Dependent Claim
26 words
The process of claim 1 wherein the extraction is carried out at a temperature between ambient temperature and the boiling point of the organic solvent used.
Claim 23
Dependent Claim
20 words
The process of claim 1 wherein the extraction is carried out while the film-like or fibrous structure is under tension.
Claim 24
Dependent Claim
31 words
The process of claim 1 wherein the aromatic polyester contains terephthalic acid as a main acid component and polymethylene glycol having 2 to 6 carbon atoms as a main glycol component.
References Cited (Backward Citations)
US3957651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |