EP0216505A2
Expired / Lapsed
EP
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Polyimides, preparation of polyimides and blends of polyimides
Assignee: Rohm and Haas Co
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Filing: 1986-08-21
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Granted: —
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Expires: 2006-08-21
Abstract
Abstract Polyimides are disclosed having a particular degree of imidization and acid and/or anhydride functionality. <??>A process for preparing polyimides, having reduced acid and/or anhydride functionality, using acid and/or anhydride blocking agent is disclosed. <??>Blends of polyimides with other thermoplastic materials are also disclosed. <??>When the acid and/or anhydride functionality of a polyimide is reduced or substantially eliminated, the resultant polyimide may exhibit altered miscibility and compatibility with the thermoplastic polymers, improved weatherability characteristics. and a lower melt viscosity thereby enhancing the processability of the polyimide.
Inventors
- 👤 Michael Paul Hallden-Abberton
- 👤 Newman Mayer Bortnick
- 👤 Leslie Alan Cohen
- 👤 Harry Charles Fromuth, Jr.
- 👤 William Thayer Freed
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 22:50
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: 17
Claim 1
Independent Claim
50 words
A thermoplastic polymer comprising imide groups and optionally acid and/or anhydride functional groups and having a degree of imidization of at least 1% characterized in that the degree of imidization on said polymer and the acid and/or anhydride functionality on said polymer are as set forth in the Table below;
Claim 2
Dependent Claim
50 words
A thermoplastic polymer comprising imide groups and optionally acid and/or anhydride functional groups and having a degree of imidization of at least 1% characterized in that the degree of imidization on said polymer and the acid and/or anhydride functionality on said polymer are as set forth in the Table below;
Claim 3
Dependent Claim
42 words
A polymer according to claim 1 wherein the degree of imidization on said polymer is from 40% to 88%, preferably from 50% to 85%, and the milliequivalents of acid and/or anhydride present is from 0 up to 0.25, preferably less than 0.25.
Claim 4
Dependent Claim
31 words
A polymer as claimed in claim 1 or claim 2, wherein said polymer contains up to 50%, preferably from 10% to 50%, by weight, of acrylic or methacrylic acid ester units.
Claim 5
Dependent Claim
29 words
A polymer as claimed in claim 1 or claim 2, wherein said polymer contains from 50% to 99%, by weight, of ester units derived from acrylic or methacrylic acid.
Claim 6
Dependent Claim
27 words
A polymer as claimed in claim 3 or claim 4, wherein the ester moiety contains from 1 to 20 carbon atoms, preferably the ester moiety is methyl.
Claim 7
Dependent Claim
38 words
A polymer according to any one of the preceding claims, wherein said polymer is a multistage polymer and either the outermost stage and/or the core and/or any other intermediate stage if present of said polymer comprises imide groups.
Claim 8
Dependent Claim
73 words
A process for the preparation of a thermoplastic polymer comprising imide groups and optionally acid and/or anhydride functional groups and having a degree of imidization of at least 1%, said process comprising reacting a first polymer comprising imide groups and active acidic and/or anhydride functional groups with a predetermined amount of acidic and/or anhydride functional group blocking agent to reduce or substantially eliminate the active acid and/or anhydride functional groups in the polymer.
Claim 9
Dependent Claim
73 words
A process for the preparation of a thermoplastic polymer comprising imide groups and optionally acid and/or anhydride functional groups and having a degree of imidization of at least 1%, said process comprising reacting a first polymer comprising imide groups and active acidic and/or anhydride functional groups with a predetermined amount of acidic and/or anhydride functional group blocking agent to reduce or substantially eliminate the active acid and/or anhydride functional groups in the polymer.
Claim 10
Dependent Claim
21 words
A process as claimed in claim 7, wherein said process is carried out at a temperature of from 50°C to 450°C.
Claim 11
Dependent Claim
30 words
A process as claimed in claim 7 or claim 8, wherein said process ic arried out at a pressure of from 1 atmosphere (101.3 KiloPascals) to 1000 atmospheres (101300 KiloPascals).
Claim 12
Dependent Claim
23 words
A process as claimed in any one of claims 7 to 9, wherein said blocking agent is an alkylating agent and/or esterification agent.
Claim 13
Dependent Claim
111 words
A process as claimed in claim 10, wherein said blocking agent is one or more of orthoesters, ketals, carbonates, sulfoxides, siloxanes, silyl ethers, silylenol ethers, trialkyl phosfates, trialkyl phosfites, dialkyl sulfates, alkyl alkylsulfonates, alkyl arylsulfonates, carbodiimides, trialkylsilyl halides, enol esters, alcohols, alkyl esters, alkyl isocyanates, quaternary ammonium salts, ureas and/or guanidines; and is preferably one or more of dimethyl carbonate, 2,2-dimethoxypropane, dimethyl sulfoxide, diethyl sulfoxide, triethyl orthoformate, trimethyl orthoacetate, trimethyl orthoformate, diphenyl carbonate, dimethyl sulfate, methyl toluenesulfonate, methyl trifluoromethylsulfonate, methyl acetate, methanol, ethanol, methyl isocyanate, p-chlorophenyl isocyanate, dimethyl carbodiimide, dimethyl t-butylsilyl chloride, isopropenyl acetate, dimethyl urea, tetramethyl ammonium hydroxide, dimethyl diethoxysilane, tetra-n-butoxysilane, dimethyl-(trimethylsily) phosfite, trimethyl phosfite, trimethyl phosfate, and tricresyl phosfate.
Claim 14
Dependent Claim
63 words
A process as claimed in any one of claims 7 to 11, wherein said reaction is conducted in a single or multi-screw extruder, in an autoclave, in a continuously recirculated pipe reactor, in a baffled in-line mixer which may be used in series with an extruder, in a wiping-film evaporator, a falling film reactor or evaporator or in a disc extruder or reactor.
Claim 15
Dependent Claim
29 words
A process as claimed in any one of claims 7 to 12 wherein said polymer has a degree of imidization of up to 99%, preferably from 10% to 95%.
Claim 16
Dependent Claim
45 words
A blend of at least one thermoplastic polymer and a second polymer, said second polymer being a polymer as claimed in any one of claims 1 to 6 or a polymer prepared by the process as claimed in any one of claims 7 to 13.
Claim 17
Dependent Claim
35 words
A blend according to claim 14, wherein said second polymer is present in an amount of from about 1% to about 99%, based on the total weight of said thermoplastic polymer plus said second polymer.
References Cited (Backward Citations)
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