Patent EP0076691A1 successfully refreshed from Google Patents.
EP0076691A1
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Anhydride polymers and imide polymers and processes for preparing them
Assignee: Rohm and Haas Co
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Filing: 1982-10-05
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Granted: —
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Expires: 2002-10-05
Abstract
Abstract Processable and thermally stable non-crosslinked anhydride polymers contain glutaric anhydride units of the formula wherein R is H or CH 3 , having an onset of decomposition temperature of at least 250°C and a Vicat temperature of 50 to 175°C. These polymers can be imidised by reaction with ammonia, preferably in an extruder. The resulting imide polymers are thermally stable and contain imide units free from methyl substitution on the nitrogen atom. The anhydride polymers can be made by devolatilizing polymer containing units of acrylic and/or methacrylic acid, preferably in an extruder which may be the same as that used for the imidisation.
Inventors
- 👤 Richard Michael Kopchik
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 17:23
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C08F8/32
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
53 words
1 . Thermoplastic, non-crosslinked polymer containing glutaric anhydride units of the formula wherein R represents CH 3 or H, said polymer being soluble in dimethyl formamide, having thermal stability as defined by an onset of decomposition temperature of at least 250°C., and processability as defined by a Vicat temperature of 50°C to 175°C.
Claim 2
Dependent Claim
53 words
1 . Thermoplastic, non-crosslinked polymer containing glutaric anhydride units of the formula wherein R represents CH 3 or H, said polymer being soluble in dimethyl formamide, having thermal stability as defined by an onset of decomposition temperature of at least 250°C., and processability as defined by a Vicat temperature of 50°C to 175°C.
Claim 3
Dependent Claim
14 words
Polymer composition according to claim 1 also containing units of other ethylenically unsaturated monomer.
Claim 4
Dependent Claim
15 words
Polymer according to claim 2 wherein said other monomer comprises styrene, ethylene, and/or methyl methacrylate.
Claim 5
Dependent Claim
15 words
Polymer according to claim 2 containing 1 to 100% by weight of the anhydride units.
Claim 6
Dependent Claim
34 words
Polymer according to any preceding claim containing 80 to 90% of said anhydride units, 5 to 20% styrene units, and 1 to 10% methacrylic acid units, said percentages being to the nearest whole number.
Claim 7
Dependent Claim
30 words
A process for producing polymer as claimed in any preceding claim comprising devolatilizing polymer containing acrylic acid and/or methacrylic acid units, preferably in an extruder, to form the anhydride units.
Claim 8
Dependent Claim
68 words
A process of imidizing polymer according to to any preceding claim to form a polymer containing imide units free from methyl groups substituted onto the nitrogen atom comprising reacting said polymer, preferably at a gauge pressure of from 0.685 x 10 N/m to 2.005 x 1 0 6 N/ m 2 (300 psi),in an extruder with ammonia which may be provided in the form of an ammonia generator.
Claim 9
Dependent Claim
32 words
A process according to claim 7 using as an ammonia generator one or more of: urea, substituted urea, a formamide, or an aqueous solution of ammonia, preferably using a solid ammonia generator.
Claim 10
Dependent Claim
23 words
Imide polymer containing units of the formula but substantially free from units of the formula wherein R represents H or CH 3 .
Claim 11
Dependent Claim
23 words
Imide polymer containing units of the formula but substantially free from units of the formula wherein R represents H or CH 3 .
Claim 12
Dependent Claim
109 words
A process for preparing polymer containing imide units free from methyl substitution on the nitrogen atom comprising a process according to claim 6 carried out in an extruder and reacting the resulting anhydride polymer at a gauge pressure of 0.685 x 1 0 6 to 2.055 x 10 6 N/m 2 (100 to 300 psi) in said extruder, wherein the ammonia or generator thereof is introduced at a downstream vent port of said extruder, and removing resulting polymer from the resulting exit port of said . extruder, said polymer containing units of acrylic and/or methacrylic acid preferably being continuously produced in a reactor and continuously fed to said extruder.
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