US4876330A
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US
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Colorless transparent polyimide shaped article and process for producing the same
Assignee: Nitto Denko Corp
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Filing: 1986-03-10
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Granted: 1989-10-24
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Expires: 2006-03-10
Abstract
Abstract A colorless transparent polyimide shaped article having as a main component at least one recurring unit selected from the recurring units of the formulae (I) to (IX). It is useful, for example, as an oriented film in liquid crystal display devices. The polyimide shaped article is produced by a process which comprises preparing a solution of a polyamide acid having as a main component at least one recurring unit selected from the recurring units of the formulae (V) to (VIII) in an amide-type organic polar solvent, forming a shaped article of the polyamide acid from the solution, and imidizing the resulting shaped article of the polyamide acid.
Inventors
- 👤 Kazumi Higashi
- 👤 Yuzuru Noda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:18
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133723; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/1039; C08G73/1042; C08G73/1046; C08G73/105; C08G73/1057; C08G73/1064; C08G73/1067; C08G73/1071; C08L; C08L79/00; C08L79/04; C08L79/08; C09; C09K; C09K2323/00; C09K2323/02; C09K2323/027; C09K2323/0271
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
136 words
A colorless transparent polyimide shaped article comprising as a main component at least one recurring unit selected from the group consisting of a recurring unit of the formula (I) ##STR18## wherein X 1 represents O, S, SO 2 , CH 2 , CF 2 , C(CH 3 ) 2 , C(CF 3 ) 2 or CO; a recurring unit of the formula (II) ##STR19## wherein X 2 represents SO 2 , C(CH 3 ) 2 or C(CF 3 ) 2 ; a recurring unit of the formula (III) ##STR20## wherein X 3 , X 4 , X 5 and X 6 which may be the same or different each represents H, F, Cl, CH 3 , C 2 H 5 , NO 2 or CF 3 ; and a recurring unit of the formula (IV) ##STR21##
Claim 2
Dependent Claim
136 words
A colorless transparent polyimide shaped article comprising as a main component at least one recurring unit selected from the group consisting of a recurring unit of the formula (I) ##STR18## wherein X 1 represents O, S, SO 2 , CH 2 , CF 2 , C(CH 3 ) 2 , C(CF 3 ) 2 or CO; a recurring unit of the formula (II) ##STR19## wherein X 2 represents SO 2 , C(CH 3 ) 2 or C(CF 3 ) 2 ; a recurring unit of the formula (III) ##STR20## wherein X 3 , X 4 , X 5 and X 6 which may be the same or different each represents H, F, Cl, CH 3 , C 2 H 5 , NO 2 or CF 3 ; and a recurring unit of the formula (IV) ##STR21##
Claim 3
Dependent Claim
31 words
A colorless transparent polyimide shaped article as in claim 1, wherein the content of at least one recurring unit of the formulae (I) to (IV) is at least 70 mol %.
Claim 4
Dependent Claim
31 words
A colorless transparent polyimide shaped article as in claim 1, wherein the content of at least one recurring unit of the formulae (I) to (IV) is at least 95 mol %.
Claim 5
Dependent Claim
54 words
A colorless transparent polyimide shaped article as in claim 1, having a trasmittance of visible light (500 nm) through a polyimide film having a thickness of 50±5 μm of at least 70%, measured according to ASTM D-1003, and a yellowness index of the polyimide film of 40 or less, measured according to JIS K-7103.
Claim 6
Dependent Claim
184 words
A process for producing a colorless polyimide shaped article, which comprises preparing a solution of (A) a polyamide acid comprising as a main component at least one recurring unit selected from the group consisting of a recurring unit of the formula (V) ##STR22## wherein X 1 represents O, S, SO 2 , CF 2 , C(CH 3 ) 2 , C(CF 3 ) 2 or CO; a recurring unit of the formula (VI) ##STR23## wherein X 2 represents SO 2 , C(CH 3 ) 2 or C(CF 3 ) 2 ; a recurring unit of the formula (VII) ##STR24## wherein X 3 , X 4 , X 5 and X 6 which may be the same or different each represents H, F, Cl, CH 3 , C 2 H 5 , NO 2 or CF 3 ; and a recurring unit of the formula (VIII) ##STR25## dissolved in (B) an amide-type organic polar solvent having a boiling point of 170° C. or less; forming a shaped article of the polyamide acid from the solution; and imidizing the resulting shaped article of the polyamide acid.
Claim 7
Dependent Claim
184 words
A process for producing a colorless polyimide shaped article, which comprises preparing a solution of (A) a polyamide acid comprising as a main component at least one recurring unit selected from the group consisting of a recurring unit of the formula (V) ##STR22## wherein X 1 represents O, S, SO 2 , CF 2 , C(CH 3 ) 2 , C(CF 3 ) 2 or CO; a recurring unit of the formula (VI) ##STR23## wherein X 2 represents SO 2 , C(CH 3 ) 2 or C(CF 3 ) 2 ; a recurring unit of the formula (VII) ##STR24## wherein X 3 , X 4 , X 5 and X 6 which may be the same or different each represents H, F, Cl, CH 3 , C 2 H 5 , NO 2 or CF 3 ; and a recurring unit of the formula (VIII) ##STR25## dissolved in (B) an amide-type organic polar solvent having a boiling point of 170° C. or less; forming a shaped article of the polyamide acid from the solution; and imidizing the resulting shaped article of the polyamide acid.
Claim 8
Dependent Claim
62 words
A process as in claim 5, wherein the polyamide acid is obtained by reacting a biphenyltetracarboxylic acid dianhydride represented by the formula (X) ##STR26## with at least one diamino compound selected from the group consisting of aromatic diamino compounds represented by the following formulae (XI) to (XIV) ##STR27## wherein X 1 to X 6 are the same as defined in claim 1.
Claim 9
Dependent Claim
16 words
A process as in claim 5, wherein the reaction is conducted at 80° C. or less.
Claim 10
Dependent Claim
18 words
A process as in claim 5, wherein the polyamide acid has a logarithmic viscosity of 0.3 to 5.0.
Claim 11
Dependent Claim
20 words
A process as in claim 5, wherein the polyamide acid solution has a concentration of 5 to 30% by weight.
Claim 12
Dependent Claim
18 words
A process as in claim 5, wherein the organic polar solvent is dimethylformamide, dimethylacetamide or a mixture thereof.
Claim 13
Dependent Claim
156 words
A solution comprising (A) a polyamide acid comprising as in main component at least one recurring unit selected from the group consisting of a recurring unit of the formula (V) ##STR28## wherein X 1 represents O, S, SO 2 , CF 2 , C(CH 3 ) 2 or CO; a recurring unit of the formula (VI) ##STR29## wherein X 2 represents SO 2 , C(CH 3 ) 2 or C(CH 3 ) 2 ) or C(CF 3 ) 2 ; a recurring unit of the formula (VII) ##STR30## wherein X 3 , X 4 , X 5 and X 6 which may be the same or different each represents H, F, Cl, CH 3 , C 2 H 5 , NO 2 or CF 3 ; and a recurring unit of the formula (VIII) ##STR31## and (B) an amide-type organic polar solvent having a boiling point of 170° C. or less, (A) being dissolved in (B).
Claim 14
Dependent Claim
156 words
A solution comprising (A) a polyamide acid comprising as in main component at least one recurring unit selected from the group consisting of a recurring unit of the formula (V) ##STR28## wherein X 1 represents O, S, SO 2 , CF 2 , C(CH 3 ) 2 or CO; a recurring unit of the formula (VI) ##STR29## wherein X 2 represents SO 2 , C(CH 3 ) 2 or C(CH 3 ) 2 ) or C(CF 3 ) 2 ; a recurring unit of the formula (VII) ##STR30## wherein X 3 , X 4 , X 5 and X 6 which may be the same or different each represents H, F, Cl, CH 3 , C 2 H 5 , NO 2 or CF 3 ; and a recurring unit of the formula (VIII) ##STR31## and (B) an amide-type organic polar solvent having a boiling point of 170° C. or less, (A) being dissolved in (B).
Claim 15
Dependent Claim
184 words
A colorless polyimide shaped article produced by the process which comprises preparing a solution of (A) a polyamide acid comprising as a main component at least one recurring unit selected from the group consisting of a recurring unit of the formula (V) ##STR32## wherein X 1 represents O, S, SO 2 , CF 2 , C(CH 3 ) 2 , C(CF 3 ) 2 or CO; a recurring unit of the formula (VI) ##STR33## wherein X 2 represents SO 2 , C(CH 3 ) 2 or C(CF 3 ) 2 ; a recurring unit of the formula (VII) ##STR34## wherein X 3 , X 4 , X 5 and X 6 which may be the same or different each represents H, F, Cl, CH 3 , C 2 H 5 , NO 2 or CF 3 ; and a recurring unit of the formula (VIII) ##STR35## dissolved in (B) an amide-type organic polar solvent having a boiling point of 170° C. or less; forming a shaped article of the polyamide acid from the solution; and imidizing the resulting shaped article of the polyamide acid.
Claim 16
Dependent Claim
184 words
A colorless polyimide shaped article produced by the process which comprises preparing a solution of (A) a polyamide acid comprising as a main component at least one recurring unit selected from the group consisting of a recurring unit of the formula (V) ##STR32## wherein X 1 represents O, S, SO 2 , CF 2 , C(CH 3 ) 2 , C(CF 3 ) 2 or CO; a recurring unit of the formula (VI) ##STR33## wherein X 2 represents SO 2 , C(CH 3 ) 2 or C(CF 3 ) 2 ; a recurring unit of the formula (VII) ##STR34## wherein X 3 , X 4 , X 5 and X 6 which may be the same or different each represents H, F, Cl, CH 3 , C 2 H 5 , NO 2 or CF 3 ; and a recurring unit of the formula (VIII) ##STR35## dissolved in (B) an amide-type organic polar solvent having a boiling point of 170° C. or less; forming a shaped article of the polyamide acid from the solution; and imidizing the resulting shaped article of the polyamide acid.
Claim 17
Dependent Claim
69 words
A color polyimide shaped article produced according to the process of claim 5, wherein the polyamide acid is obtained by reacting a biphenyltetracarboxylic acid dianhydride represented by the formula (X) ##STR36## with at least one diamino compound selected from the group consisting of aromatic diamino compounds represented by the following formulae (XI) to (XIV) ##STR37## wherein X 1 and X 6 are the same as defined in claim 1.
Claim 18
Dependent Claim
23 words
A colorless polyimide shaped article produced according to the process of claim 5, wherein the reaction is conducted at 80° C. or less.
Claim 19
Dependent Claim
25 words
A colorless polyimide shaped article produced according to the process of claim 5, wherein the polyamide acid has a logarithmic viscosity of 0.3 to 5.0.
Claim 20
Dependent Claim
27 words
A colorless polyimide shaped article produced according to the process of claim 5, wherein the polyamide acid solution has a concentration of 5 to 30% by weight.
Claim 21
Dependent Claim
25 words
A colorless polyimide shaped article produced according to the process of claim 5, wherein the organic polar solvent is dimethylforamide, diamethyalacetamide or a mixture thereof.
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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) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |