US4517315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of a film-like or fibrous structure of an aromatic polyester
Assignee: Teijin Ltd
•
Filing: 1982-01-18
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Granted: 1985-05-14
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Expires: 2002-01-18
Abstract
Abstract A process for producing a film-like or fibrous structure of an aromatic polyester, which comprises (1) forming an unstretched film-like or fibrous structure by melt-shaping a blend comprising 100 parts by weight of (A) an aromatic polyester having a high degree of polymerization derived from 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) 3 to 300 parts by weight of a low-molecular-weight compound being substantially non-reactive with the aromatic polyester (A) and having a boiling point of at least about 200° C. under atmospheric pressure and a molecular weight of not more than 1,000, (2) stretching the resulting film-like or fibrous structure, (3) extracting at least a major portion of the low-molecular-weight compound from the stretched film-like or fibrous structure by using an organic solvent which does not substantially dissolve the aromatic polyester under the extracting conditions, and (4) if desired, heat-setting the film-like or fibrous structure after the stretching step (2) and/or the extracting step (3). The film-like or fibrous structure of an aromatic polyester prepared by the process substantially contains no low-molecular-weight compound or contains the low-molecular-weight compound in an amount of up to about 1 part by weight at most per 100 parts by weight of the aromatic polyester.
Inventors
- 👤 Shunichi Matsumura
- 👤 Hiroo Inata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:06
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08K; C08K5/00; C08K5/16; C08K5/34; D; D01; D01F; D01F6/00; D01F6/88; D01F6/92; C08J2367/00; C08J2367/02; Y; Y10; Y10S; Y10S264/00; Y10S264/13
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
352 words
A process for producing a film-like or fibrous structure of an aromatic polyester which does not contain pores which open to both surfaces, which comprises (1) forming an unstretched film-like or fibrous structure by melt-shaping a blend comprising 100 parts by weight of (A) an aromatic polyester having a high degree of polymerization and 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) 3 to 300 parts by weight of a low-molecular-weight compound being substantially non-reactive with the aromatic polyester (A) and having a boiling point of at least about 200° C. under atmospheric pressure and a molecular weight of not more than 1,000 and being a compound selected from the group consisting of imide compounds of the formula (1)-a ##STR15## wherein A 1 represents a divalent aromatic group or linear or cyclic aliphatic group which may be substituted R 1 represents an aromatic group or linear or cyclic aliphatic group having a valence of n; n is 1 or 2; and the imide ring is 5- or 6-membered, imide compounds of the following formula (1)-b ##STR16## wherein A 2 represents a tetravalent aromatic group which may be substituted, R 2 represents a monovalent linear or cyclic aliphatic group which may be substituted, and the imide rings are 5- or 6-membered, trialkylisocyanurates of the formula (1)-c ##STR17## wherein R 3 represents a monovalent alkyl group, diphenyl compounds of the formula (1)-d ##STR18## wherein A 3 represents --O--, --SO 2 --, --CO--, or an alkylene group, and the phenyl rings may be substituted, nitrobenzene, nitrotoluene, and nitronaphthalene, (2) stretching the resulting film-like or fibrous structure, the stretching ratio being from about 3 to about 7 in the case of the fibrous structure and from about 3 to about 30 in terms of area ratio in the case of the film-like structure, and (3) extracting at least a major portion of the low-molecular-weight compound from the stretched film-like or fibrous structure by using an organic solvent which does not substantially dissolve the aromatic polyester under the extracting conditions.
Claim 2
Dependent Claim
352 words
A process for producing a film-like or fibrous structure of an aromatic polyester which does not contain pores which open to both surfaces, which comprises (1) forming an unstretched film-like or fibrous structure by melt-shaping a blend comprising 100 parts by weight of (A) an aromatic polyester having a high degree of polymerization and 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) 3 to 300 parts by weight of a low-molecular-weight compound being substantially non-reactive with the aromatic polyester (A) and having a boiling point of at least about 200° C. under atmospheric pressure and a molecular weight of not more than 1,000 and being a compound selected from the group consisting of imide compounds of the formula (1)-a ##STR15## wherein A 1 represents a divalent aromatic group or linear or cyclic aliphatic group which may be substituted R 1 represents an aromatic group or linear or cyclic aliphatic group having a valence of n; n is 1 or 2; and the imide ring is 5- or 6-membered, imide compounds of the following formula (1)-b ##STR16## wherein A 2 represents a tetravalent aromatic group which may be substituted, R 2 represents a monovalent linear or cyclic aliphatic group which may be substituted, and the imide rings are 5- or 6-membered, trialkylisocyanurates of the formula (1)-c ##STR17## wherein R 3 represents a monovalent alkyl group, diphenyl compounds of the formula (1)-d ##STR18## wherein A 3 represents --O--, --SO 2 --, --CO--, or an alkylene group, and the phenyl rings may be substituted, nitrobenzene, nitrotoluene, and nitronaphthalene, (2) stretching the resulting film-like or fibrous structure, the stretching ratio being from about 3 to about 7 in the case of the fibrous structure and from about 3 to about 30 in terms of area ratio in the case of the film-like structure, and (3) extracting at least a major portion of the low-molecular-weight compound from the stretched film-like or fibrous structure by using an organic solvent which does not substantially dissolve the aromatic polyester under the extracting conditions.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the aromatic polyester (A) has an intrinsic viscosity, measured at 35° C. in an o-chlorophenol solution, of at least about 0.6.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the low-molecular-weight compound has a melting point of at least about 100° C.
Claim 5
Dependent Claim
28 words
The process of claim 1 wherein the amount of the low-molecular-weight compound is 5 to 200 parts by weight per 100 parts by weight of the aromatic polyester.
Claim 6
Dependent Claim
28 words
The process of claim 1 wherein the amount of the low-molecular-weight compound is 10 to 150 parts by weight per 100 parts by weight of the aromatic polyester.
Claim 7
Dependent Claim
32 words
The process of claim 1 for producing a film-like structure wherein the thickness of the stretched film-like structure to be submitted to the extracting step is not more than about 1 mm.
Claim 8
Dependent Claim
32 words
The process of claim 1 for producing a fiber-like structure wherein the diameter of the stretched fibrous structure to be submitted to the extracting step is not more than about 1 mm.
Claim 9
Dependent Claim
32 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 less than about 200° C. under atmospheric pressure.
Claim 10
Dependent Claim
65 words
The process of claim 1 or 8 wherein the organic solvent is an aromatic hydrocarbon having 6 to 9 carbon atoms, a halogenated aliphatic hydrocarbon having 1 to 2 carbon atoms, an aliphatic ketone having 3 to 6 carbon atoms, an aliphatic 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 11
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 12
Dependent Claim
13 words
The process of claim 1 wherein the extraction is carried out under tension.
Claim 13
Dependent Claim
32 words
The process of claim 1 wherein the aromatic polyester contains terephthalic acid as a main acid component and a polymethylene glycol having 2 to 6 carbon atoms as a main glycol component.
Claim 14
Dependent Claim
19 words
The process of claim 1 wherein the low-molecular-weight compound is triethyl isocyanurate, tributyl isocyanurate, trihexyl isocyanurate or trioctyl isocyanurate.
Claim 15
Dependent Claim
20 words
The process of claim 1 wherein the low molecular-weight compound is diphenyl ether, diphenyl sulfone, benzophenone, diphenylmethane, 1,2-diphenylethane or 1,4-diphenylbutane.
Claim 16
Dependent Claim
51 words
The process of claim 1 wherein the low-molecular-weight compound is selected from the group consisting of N-methylphthalimide, N-ethylphthalimide, N-octylphthalimide, N-laurylphthalimide, N-myristylphthalimide, N-cetylphthalimide, N-stearylphthalimide, N-ethyl-1,8-naphthalimide, N-lauryl-1,8-naphthalimide, N-myrystyl-1,8-naphthalimide, N-cetyl-1,8-naphthalimide, N-stearyl-1,8-naphthalimide, N,N'-ethylenebisphthalimide, N,N'-tetramethylenebisphthalimide, N,N'-hexamethylenebisphthalimide, N,N'-octamethylenebisphthalimide, N,N'-decamethylenebisphthalimide, N,N'-dodecamethylbenebisphthalimide, N,N'-neopentylenebisphthalimide, N,N'-tetramethylenebis(1,8-naphthalimide), N,N'-hexamethylenebis(1,8-naphthalimide), N,N'-octamethylenebis(1,8-naphthalimide), N,N'-dodecamethylenebis(1,8-naphthalimide), N,N'-dodecamethylenebissuccinimide, N,N'-dodecamethylenebishexahydrophthalimide, N,N'-1,4-cyclohexylenebisphthalimide, 1-phthalimide-2-phthalimidomethyl-3,5,5-trimethylcyclohexane, N,N'-2,2,4-trimethylhexamethylenebisphthalimide, N,N'-2,4,4-trimethylhexamethylenebisphthalimide, 4,4'-bisphthalimidodiphenylether, 3,4'-bisphthalimidodiphenylether, 3,3'-bisphthalimidodiphenylsulfone, 4,4'-bisphthalimidodiphenylsulfone, and 4,4'-bisphthalimidodiphenylmethane.
Claim 17
Dependent Claim
27 words
The process of claim 1 wherein the low-molecular-weight compound is selected from the group consisting of N,N'-diethylpyromellitimide, N,N'-dibutylpyromellitimide, N,N'-dihexylpyromellitimide, N,N'-dioctylpyromellitimide, N,N'-didecylpyromellitimide, N,N'-dilaurylpyromellitimide, N,N'-dicyclohexylpyromellitimide, and N,N'-diethyl-1,4,5,8-naphthalenetetracarboxylic acid 1,8-4,5-diimide.
Claim 18
Dependent Claim
25 words
The process of claim 1 which further comprises heat-setting the film-like or fibrous structure after the stretching step (2) and before the extracting step (3).
Claim 19
Dependent Claim
20 words
The process of claim 17 which further comprises heat-setting the stretched film-like or fibrous structure after the extracting step (3).
Claim 20
Dependent Claim
20 words
The process of claim 1 which further comprises heat-setting the stretched film-like or fibrous structure after the extracting step (3).
Claim 21
Dependent Claim
40 words
The process of claim 1 wherein the step (1) of forming the unstretched film-like or fibrous structure comprises melt-shaping the blend of the aromatic polyester and low-molecular-weight compound at a temperature in the range of 245° C. to 290° C.
Claim 22
Dependent Claim
14 words
The process of claim 1 wherein the low-molecular-weight compound is nitrobenzene, nitrotoluene or nitronaphthalene.
Claim 23
Dependent Claim
12 words
The process of claim 1 wherein the aromatic polyester is polyethylene terephthalate.
Claim 24
Dependent Claim
33 words
The process of claim 1 for producing a film-like structure wherein step (2) comprises stretching the resulting film-like structure to a stretch ratio, in terms of area, of from about 3 to 30.
Claim 25
Dependent Claim
29 words
The process of claim 1 for producing a fibrous structure wherein step (2) comprises stretching the resulting fibrous structure to a stretch ratio of from about 3 to 7.
Claim 26
Dependent Claim
50 words
A film-like or fibrous structure of an aromatic polyester, prepared by the process of claim 1, said structure substantially containing no low-molecular-weight compound or containing the low-molecular-weight compound in an amount of up to about 1 part by weight at most per 100 parts by weight of the aromatic polyester.
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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) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |