Patent US5597889A successfully refreshed from Google Patents.
US5597889A
Expired / Lapsed
US
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Organic polymer and preparation and use thereof
Assignee: Panasonic Holdings Corp
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Filing: 1995-05-26
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Granted: 1997-01-28
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Expires: 2015-05-26
Abstract
Abstract An alternating copolymer comprising a repeating unit of the formula:-Z-(X-Y)n-(I)wherein n is at least 2, X is O, S, Se or Te, and Y and Z are independently an aromatic or substituted aromatic group, and at least one other repeating unit, which is useful as a photosensitive material used in a spatial light modulator.
Inventors
- 👤 Akio Takimoto
- 👤 Hirofumi Wakemoto
- 👤 Eiichiro Tanaka
- 👤 Masanori Watanabe
- 👤 Junko Asayama
- 👤 Hisahito Ogawa
- 👤 Shigehiro Sato
- 👤 Fumiko Yokotani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:51
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G63/00; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886; C08G69/00; C08G69/02; C08G69/26; C08G69/32; C08G69/40; C08G69/42; C08G69/44; C08G73/1046; C08G73/105; C08G73/1057; C08G73/1064; C08G73/1067; C08G73/14; C08G73/16; C09; C09B; C09B69/00; C09B69/10; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/135; G02F1/1354; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; G03G5/075; G03G5/076; G03G5/0763; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/32; C09K2019/328; C09K2323/00; C09K2323/02; C09K2323/027; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
166 words
A process for preparing a polyimide comprising reacting a diamine of the formula: NH.sub.2 --(Y.sub.i -X.sub.i).sub.n --Y.sub.i --NH.sub.2 (III) wherein n is a number of at least 2, i is a positive integer not larger than n, Y is an aromatic or substituted aromatic group, and X is O, S, Se, Te or the divalent group --CH═CH--, and a tetracarboxylic dianhydride of the formula: ##STR7## wherein A is a tetravalent hydrocarbon group in a molar ratio of said diamine to said dianhydride of 1:(1+m) wherein m is a positive number to obtain a polyamic acid, wherein said diamine and said tetracarboxylic dianhydride are reacted in a ratio of said diamine to said dianhydride of 1:(1+m), wherein m is larger than zero and smaller than 1, to form said polyamic acid, and then an additional amount of said carboxylic anhydride is added to said polyamic acid; polymerizing said polyamic acid; and annealing the resultant polymerization product at a temperature of 200° to 400° C. to obtain polyimide.
Claim 2
Dependent Claim
166 words
A process for preparing a polyimide comprising reacting a diamine of the formula: NH.sub.2 --(Y.sub.i -X.sub.i).sub.n --Y.sub.i --NH.sub.2 (III) wherein n is a number of at least 2, i is a positive integer not larger than n, Y is an aromatic or substituted aromatic group, and X is O, S, Se, Te or the divalent group --CH═CH--, and a tetracarboxylic dianhydride of the formula: ##STR7## wherein A is a tetravalent hydrocarbon group in a molar ratio of said diamine to said dianhydride of 1:(1+m) wherein m is a positive number to obtain a polyamic acid, wherein said diamine and said tetracarboxylic dianhydride are reacted in a ratio of said diamine to said dianhydride of 1:(1+m), wherein m is larger than zero and smaller than 1, to form said polyamic acid, and then an additional amount of said carboxylic anhydride is added to said polyamic acid; polymerizing said polyamic acid; and annealing the resultant polymerization product at a temperature of 200° to 400° C. to obtain polyimide.
Claim 3
Dependent Claim
126 words
A process for preparing an organic polymer comprising evaporating a raw material comprising a diamine of the formula: NH.sub.2 --(Y.sub.i -X.sub.i).sub.n --Y.sub.i --NH.sub.2 (III) wherein n is a number of at least 2, i is a positive integer not larger than n, Y is an aromatic or substituted aromatic group, and X is O, S, Se, Te or the divalent group --CH═CH--, and a tetracarboxylic dianhydride of the formula: ##STR8## wherein A is a tetravalent hydrocarbon group, and wherein said diamine and said dianhydride are independently evaporated in an evaporation ratio of said diamine to said dianhydride of 1:(1+m), wherein m is a positive number; and polymerizing them on a substrate, wherein the temperature of said substrate is higher than a melting point of said diamine.
Claim 4
Dependent Claim
126 words
A process for preparing an organic polymer comprising evaporating a raw material comprising a diamine of the formula: NH.sub.2 --(Y.sub.i -X.sub.i).sub.n --Y.sub.i --NH.sub.2 (III) wherein n is a number of at least 2, i is a positive integer not larger than n, Y is an aromatic or substituted aromatic group, and X is O, S, Se, Te or the divalent group --CH═CH--, and a tetracarboxylic dianhydride of the formula: ##STR8## wherein A is a tetravalent hydrocarbon group, and wherein said diamine and said dianhydride are independently evaporated in an evaporation ratio of said diamine to said dianhydride of 1:(1+m), wherein m is a positive number; and polymerizing them on a substrate, wherein the temperature of said substrate is higher than a melting point of said diamine.
Claim 5
Dependent Claim
15 words
The process according to claim 2, wherein said substrate is coated with a polyimide film.
Claim 6
Dependent Claim
15 words
The process according to claim 3, wherein said polyimide film is subjected to rubbing treatment.
Claim 7
Dependent Claim
24 words
The process according to claim 2, wherein after deposition of said polyimide, said substrate is heated to a temperature of 200° C. or higher.
Claim 8
Dependent Claim
16 words
The process according to claim 2, wherein said substrate is coated with a silane coupling agent.
Claim 9
Dependent Claim
15 words
The process according to claim 6, wherein said diamine and said dianhydride are alternately evaporated.
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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) | 2000-01-28 | 2000-07-29 | 2001-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-28 | 2004-07-29 | 2005-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-28 | 2008-07-29 | 2009-01-28 | $7700.00 | Window Closed / Lapsed |