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US4874835A
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Polyetherimides and precursors therefor from oxydiphtalic anhydride diester and a mixture of diamines
Assignee: SABIC Global Technologies BV
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Filing: 1988-07-15
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Granted: 1989-10-17
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Expires: 2008-07-15
Abstract
Abstract Polyetherimide precursor compositions are prepared by a reacting mixture of at least two diamines selected from the group consisting of o-phenylenediamine, m-phenylenediamine and 4-aminophenyl ether with the esterification product of a low molecular weight alkanol such as methanol and an ether tetracarboxylic acid dianhydride, preferably 3,4-dicarboxyphenyl ether dianhydride. Said polyimide precursor compositions may be converted to polyimides useful in composite formation, by gently heating to remove excess alkanol and subsequently baking at temperatures in the range of about 275°-375° C.
Inventors
- 👤 Donald R. Berdahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:22
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1067; C08G73/1071; C08G73/1003; C08G73/1007; C08G73/1028; C08G73/1042
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
137 words
A method for preparing a polyetherimide precursor composition which comprises blending, at a temperature up to about 50° C., reagents consisting of: (A) a mixture of at least two diamines selected from the group consisting of m-phenylenediamine, p-phenylenediamine and 4-aminophenyl ether, each of said diamines being present in the amount of about 25-75 mole percent of said mixture; and (B) the esterification product of the reaction of (B-1) at least one ether tetracarboxylic acid dianhydride of the formula ##STR3## and (B-2) at least one alkanol of the formula R 1 OH, wherein R 1 is a C 1-4 primary or secondary alkyl radical; reagent B-2 being employed in the amount of about 10-20 moles per mole of reagent B-1; said esterification product being principally a tetracarboxylic acid diester with one carboxy group on each benzene ring esterified.
Claim 2
Independent Claim
137 words
A method for preparing a polyetherimide precursor composition which comprises blending, at a temperature up to about 50° C., reagents consisting of: (A) a mixture of at least two diamines selected from the group consisting of m-phenylenediamine, p-phenylenediamine and 4-aminophenyl ether, each of said diamines being present in the amount of about 25-75 mole percent of said mixture; and (B) the esterification product of the reaction of (B-1) at least one ether tetracarboxylic acid dianhydride of the formula ##STR3## and (B-2) at least one alkanol of the formula R 1 OH, wherein R 1 is a C 1-4 primary or secondary alkyl radical; reagent B-2 being employed in the amount of about 10-20 moles per mole of reagent B-1; said esterification product being principally a tetracarboxylic acid diester with one carboxy group on each benzene ring esterified.
Claim 3
Dependent Claim
11 words
A method according to claim 1 wherein reagent B-2 is methanol.
Claim 4
Dependent Claim
13 words
A method according to claim 2 wherein reagent B-1 is 3,4-dicarboxyphenyl ether dianhydride.
Claim 5
Dependent Claim
16 words
A method according to claim 3 wherein reagents A and B-1 are employed in equimolar amounts.
Claim 6
Dependent Claim
17 words
A method according to claim 4 wherein the temperature is in the range of about 20°-35° C.
Claim 7
Dependent Claim
15 words
A method according to claim 5 wherein A is a mixture of m-phenylenediamine and p-phenylenediamine.
Claim 8
Dependent Claim
14 words
A method according to claim 6 wherein said diamines are employed in equimolar amounts.
Claim 9
Dependent Claim
18 words
A method according to claim 5 wherein reagent A is a mixture of m-phenylenediamine, p-phenylenediamine and 4-aminophenyl ether.
Claim 10
Dependent Claim
14 words
A method according to claim 8 wherein said diamines are employed in equimolar amounts.
Claim 11
Independent Claim
143 words
A method for preparing a polyetherimide precursor composition which comprises blending, at a temperature up to about 50° C., reagents consisting of: (A) a mixture of at least two diamines selected from the group consisting of m-phenylenediamine, p-phenylenediamine and 4-aminophenyl ether, each of said diamines being present in the amount of about 25-75 mole percent of said mixture; (B) the esterification product of the reaction of (B-1) at least one ether tetracarboxylic acid dianhydride of the formula ##STR4## and (B-2) at least one alkanol of the formula R 1 OH, wherein R 1 is a C 1-4 primary or secondary alkyl radical; reagent B-2 being employed in the amount of about 10-20 moles per mole of reagent B-1; said esterification product being principally a tetracarboxylic acid diester with one carboxy group on each benzene ring esterified; and at least one non-olefinic endcapping agent.
Claim 12
Independent Claim
143 words
A method for preparing a polyetherimide precursor composition which comprises blending, at a temperature up to about 50° C., reagents consisting of: (A) a mixture of at least two diamines selected from the group consisting of m-phenylenediamine, p-phenylenediamine and 4-aminophenyl ether, each of said diamines being present in the amount of about 25-75 mole percent of said mixture; (B) the esterification product of the reaction of (B-1) at least one ether tetracarboxylic acid dianhydride of the formula ##STR4## and (B-2) at least one alkanol of the formula R 1 OH, wherein R 1 is a C 1-4 primary or secondary alkyl radical; reagent B-2 being employed in the amount of about 10-20 moles per mole of reagent B-1; said esterification product being principally a tetracarboxylic acid diester with one carboxy group on each benzene ring esterified; and at least one non-olefinic endcapping agent.
Claim 13
Dependent Claim
11 words
A method according to claim 10 wherein reagent B-2 is methanol.
Claim 14
Dependent Claim
13 words
A method according to claim 11 wherein reagent B-1 is 3,4-dicarboxyphenyl ether dianhydride.
Claim 15
Dependent Claim
16 words
A method according to claim 12 wherein reagents A and B-1 are employed in equimolar amounts.
Claim 16
Dependent Claim
17 words
A method according to claim 13 wherein the temperature is in the range of about 20°-35° C.
Claim 17
Dependent Claim
15 words
A method according to claim 14 wherein A is a mixture of m-phenylenediamine and p-phenylenediamine.
Claim 18
Dependent Claim
14 words
A method according to claim 15 wherein said diamines are employed in equimolar amounts.
Claim 19
Dependent Claim
18 words
A method according to claim 14 wherein reagent A is a mixture of m-phenylenediamine, p-phenylenediamine and 4-aminophenyl ether.
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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) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |