US4727117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imide polymers
Assignee: Rohm and Haas Co
•
Filing: 1985-08-27
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Granted: 1988-02-23
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Expires: 2005-08-27
Abstract
Abstract Glutarimide polymers having an acid and anhydride content lower than the acid and/or anhydride content normally present in the glutarimide polymers. Blends of the reduced acid and anhydride glutarimide polymers with thermoplastic materials are disclosed. A process for altering the properties oif imide polymers by reducing or substantially removing acid and anhydride levels normally present in the imide polymer is also disclosed.
Inventors
- 👤 Michael P. Hallden-Abberton
- 👤 Newman M. Bortnick
- 👤 Leslie A. Cohen
- 👤 William T. Freed
- 👤 Harry C. Fromuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:08
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08F; C08F8/00; C08F8/30; C08F8/32; C08L; C08L101/00; C08L101/02; C08L33/00; C08L33/24
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
137 words
A process for altering the properties of a polymer containing imide units of the structural formula ##STR1## wherein R 1 , R 2 and R 3 are independently selected from among hydrogen and substituted or unsubstituted, C 1 to C 20 alkyl, aryl, alkaryl or aralkyl, or mixtures thereof, wherein any substituents present are selected from the group consisting of methyl, ethyl, hydroxyl, methoxy, ethoxy, halo, carboxyl and ethylcarbonyl, wherein n is 0-1, and wherein the degree of imidization is at least 1% and said polymer contains residual acidic and anhydride groups, which process comprises reacting said residual groups with an agent capable of converting said acid and anhydride groups to non-acid or non-anhydride groups and incapable of reacting with said imide units, said agent being selected from the group consisting of alkylating agents and esterification agents.
Claim 2
Dependent Claim
137 words
A process for altering the properties of a polymer containing imide units of the structural formula ##STR1## wherein R 1 , R 2 and R 3 are independently selected from among hydrogen and substituted or unsubstituted, C 1 to C 20 alkyl, aryl, alkaryl or aralkyl, or mixtures thereof, wherein any substituents present are selected from the group consisting of methyl, ethyl, hydroxyl, methoxy, ethoxy, halo, carboxyl and ethylcarbonyl, wherein n is 0-1, and wherein the degree of imidization is at least 1% and said polymer contains residual acidic and anhydride groups, which process comprises reacting said residual groups with an agent capable of converting said acid and anhydride groups to non-acid or non-anhydride groups and incapable of reacting with said imide units, said agent being selected from the group consisting of alkylating agents and esterification agents.
Claim 3
Dependent Claim
12 words
A process according to claim 1 wherein said agent is an orthoester.
Claim 4
Dependent Claim
12 words
A process according to claim 1 wherein said agent is a ketal.
Claim 5
Dependent Claim
17 words
A process according to claim 1 wherein said agent is an alkyl, aryl, alkaryl or aralkyl carbonate.
Claim 6
Dependent Claim
13 words
A process according to claim 1 wherein said agent is a dialkyl sulfoxide.
Claim 7
Dependent Claim
23 words
A process according to claim 1 wherein said reaction is conducted at a temperature of from about 50° C. to about 400° C.
Claim 8
Dependent Claim
22 words
A process according to claim 1 wherein said reaction is conducted at a pressure of from about atmospheric to about 150 atmospheres.
Claim 9
Dependent Claim
30 words
A process according to claim 1 wherein said agent is used in about a stoichiometric amount necessary to react with the undesired amount of residual acidic or residual anhydride groups.
Claim 10
Dependent Claim
38 words
A process according to claim 1 wherein said agent is used in an amount of from about 10% to about 50% in excess of the stoichiometric amount necessary to react with the residual acidic or residual anhydride groups.
Claim 11
Dependent Claim
12 words
A process according to claim 1 wherein said agent is trimethyl orthoformate.
Claim 12
Dependent Claim
12 words
A process according to claim 1 wherein said agent is triethyl orthoformate.
Claim 13
Dependent Claim
12 words
A process according to claim 1 wherein said agent is dimethyl carbonate.
Claim 14
Dependent Claim
12 words
A process according to claim 1 wherein said agent is dimethyl sulfoxide.
Claim 15
Dependent Claim
11 words
A process according to claim 1 wherein said agent is 2,2-dimethoxypropane.
Claim 16
Dependent Claim
24 words
A process according to claim 1 wherein said reaction is conducted in a screw extruder having at least one screw mixing element disposed therein.
Claim 17
Dependent Claim
16 words
A process according to claim 1 wherein said reaction is conducted in a melt mixing device.
Claim 18
Dependent Claim
12 words
A process according to claim 1 wherein said polymer is a polyglutarimide.
Claim 19
Dependent Claim
22 words
A process according to claim 1 wherein said polymer is a polyglutarimide having a degree of imidization of up to about 99%.
Claim 20
Dependent Claim
24 words
A process according to claim 1 wherein said polymer is a polyglutarimide having a degree of imidization of from about 10% to about 95%.
Claim 21
Dependent Claim
20 words
A process according to claim 1 wherein said polymer is a polyglutarimide wherein said imide units are derived from methylamine.
Claim 22
Dependent Claim
20 words
A process according to claim 1 wherein said polymer is a polyglutarimide wherein said imide units are derived from ammonia.
Claim 23
Dependent Claim
12 words
The process according to claim 20 wherein said agent is dimethyl carbonate.
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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) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-22 | 1999-08-24 | 2000-02-23 | $7700.00 | Window Closed / Lapsed |