Abstract: Provided are: a urethane-based polycarbonate resin, including a repeating unit represented by the general formula [1], and a repeating unit represented by the general formula [2], in which the urethane-based polycarbonate resin has high wear resistance by virtue of a strong hydrogen bond between urethane groups; and an electrophotographic photoconductor, including a photosensitive layer provided on a conductive substrate, in which the electrophotographic photoconductor includes the above-mentioned polycarbonate resin as a component of the photosensitive layer, has high wear resistance, and maintains an excellent electrophotographic characteristic over a longtime period: [Chem. 1] (Ar2 represents a group having a divalent aromatic group, and Ar1 represents a divalent aromatic group-containing group having a specific structure).

Abstract: The present invention relates to amphiphilic polymers, and micelles and compositions comprising the same, and their use in a variety of biological settings, including imaging, targeting drugs, or a combination thereof for diagnostic and therapeutic purposes.

Abstract: The present invention discloses a new type of polyimide membrane with high permeances and high selectivities for gas separations and particularly for CO2/CH4 and H2/CH4 separations. The polyimide membranes have CO2 permeability of 50 Barrers or higher and single-gas selectivity for CO2/CH4 of 15 or higher at 50° C. under 791 kPa for CO2/CH4 separation. The polyimide membranes have UV cross-linkable functional groups and can be used for the preparation of UV cross-linked polyimide membranes having CO2 permeability of 20 Barrers or higher and single-gas selectivity for CO2/CH4 of 35 or higher at 50° C. under 791 kPa for CO2/CH4 separation.

Abstract: A copolycarbonate-polyester, comprising units of formula wherein at least 60 percent of the total number of R1 groups are divalent aromatic organic radicals and the balance thereof are divalent aliphatic or alicyclic radicals; units of formula wherein T is a C7-20 divalent alkyl aromatic radical or a C6-20 divalent aromatic radical, and D is a divalent C6-20 aromatic radical; and units of the formula wherein R2 and R3 are each independently a halogen or a C1-6 alkyl group, R4 is a methyl or phenyl group, each c is independently 0 to 4, and T is as described above. A method of making a copolycarbonate-polyester is also disclosed.

Abstract: Aniline copolymers and methods of making these copolymers are disclosed herein. The copolymers can, for example, be used for removing metal ions from a sample.

Abstract: The present invention relates to A phenol compound according to Formula (I): wherein: R1 is selected from the group consisting of, optionally substituted, 2-pyridyl, 3-pyridiyl and 4-pyridyl groups, wherein R1 is at position 2 or 3 of the phenol ring; R2 is selected from the group consisting of, optionally substituted, 2-pyridyl, 3-pyridiyl, 4-pyridyl and phenyl groups, wherein R2 is at position 5 or 6 of the phenol ring; and the phenol ring is optionally substituted at one or two positions, independently selected from positions 2, 3, 5 and 6, with a halogen atom or a with an optionally substituted C6-C12 aryl group or an optionally substituted C1-C10 alkyl group. The present invention relates also to (co)polymers comprising the phenol compound according to Formula (I) and membranes and ionic resins comprising said (co)polymers.

Abstract: Biocompatible, bioresorbable polymers comprising a plurality of monomeric repeating units containing an amide group, wherein said amide groups are N-substituted and the N-substituent and degree of N-substitution are effective to lower the melt viscosity, the solution viscosity, or both, compared to the same polymer without N-substitution.

Abstract: A dihalobiphenyl compound represented by the formula (1): wherein A represents an amino group substituted with one or two C1-C20 hydrocarbon groups or a C1-C20 alkoxy group, R1 represents a fluorine atom, a C1-C20 alkyl group, etc., X1 represents a chlorine atom, a bromine atom or an iodine atom, an k represents an integer of 0 to 3, and a polyarylene comprising a repeating unit represented by the formula (2): wherein A, R1 and k represent the same meanings as defined above.

Abstract: The present invention relates to an aqueous alkali-developable photosensitive polyimide precursor resin composition that is appropriate for highly heat-resistant transparent protection layers and insulation layers for liquid crystal display devices. In more detail, the present invention relates to a negative-type photosensitive transparent polyimide precursor resin composition manufactured in two steps.

Abstract: Polyethersulfones having Tg greater than about 225° C. and a notched Izod value greater than about 1 ft-lb/in, as measured by ASTM D256, comprise from about 5 mol % to less than about 40 mol % structural units of formula 1; and from greater than about 60 mol % to about 95 mol % structural units of formula 2 wherein R1, R2, and R3 are independently at each occurrence a halogen atom, a nitro group, a cyano group, a C1-C12aliphatic radical, C3-C12cycloaliphatic radical, or a C3-C12aromatic radical; n, m, q are independently at each occurrence integers from 0 to 4; and Q is a C3-C20cycloaliphatic radical, or a C3-C20aromatic radical.

Abstract: Polyethersulfones having Tg greater than about 225° C. and a notched Izod value greater than about 1 ft-lb/in, as measured by ASTM D256, comprise from about 5 mol % to less than about 40 mol % structural units of formula 1; and from greater than about 60 mol % to about 95 mol % structural units of formula 2 wherein R1, R2, and R3 are independently at each occurrence a halogen atom, a nitro group, a cyano group, a C1-C12 aliphatic radical, C3-C12 cycloaliphatic radical, or a C3-C12 aromatic radical; n, m, q are independently at each occurrence integers from 0 to 4; and Q is a C3-C20 cycloaliphatic radical, or a C3-C20 aromatic radical.

Abstract: A polyimide precursor composition includes an oligomer or polymer having a substituted or unsubstituted carbonyl group only in a side chain and a diamine compound. A method of manufacturing a polyimide, and a polyimide film, are also disclosed.

Abstract: A polyamide having at least an alicyclic or aromatic group exhibiting a light transmittance of 80% or more in the wavelength region of 450 to 700 nm is produced by using an aramide polymer comprising specific structural units at an amount of 50 mol % or more. Colorless transparent alicyclic or aromatic polyamide films having high rigidity and high thermal resistance are provided by using the polyamide. Further, the invention provides various optical members made by using the polyamide or the polyamide films, and polyamide copolymers.

Abstract: In a method for preparing a polyimide resin by reacting diamine and dianhydride, the polyimide resin is polymerized under the presence of a solvent having a boiling point ranging from 130° C. to 180° C. so as to be curable at a low temperature ranging from 150° C. to 250° C. Because the polyimide is curable even at a low temperature, when the polyimide resin is used as an electronic material, damage to equipment due to an otherwise high temperature process can be minimized, and in addition, the polyimide resin can be extensively used as an electronic material such as for a plastic substrate, or the like.

Abstract: Provided are: a urethane-based polycarbonate resin, including a repeating unit represented by the general formula [1], and a repeating unit represented by the general formula [2], in which the urethane-based polycarbonate resin has high wear resistance by virtue of a strong hydrogen bond between urethane groups; and an electrophotographic photoconductor, including a photosensitive layer provided on a conductive substrate, in which the electrophotographic photoconductor includes the above-mentioned polycarbonate resin as a component of the photosensitive layer, has high wear resistance, and maintains an excellent electrophotographic characteristic over a longtime period: [Chem. 1] (Ar2 represents a group having a divalent aromatic group, and Ar1 represents a divalent aromatic group-containing group having a specific structure).

Abstract: Biocompatible, bioresorbable polymers comprising a plurality of monomeric repeating units containing an amide group, wherein said amide groups are N-substituted and the N-substituent and degree of N-substitution are effective to lower the melt viscosity, the solution viscosity, or both, compared to the same polymer without N-substitution.

Abstract: A method for forming a polyimide composite article utilizes a polyimide resin system including at least a first prepolymer component and a second prepolymer component. A preform structure is tackified with the first prepolymer component. Using resin infusion or resin transfer molding techniques, the tackified preform structure is contacted with the second prepolymer component. The polyimide resin system is cured under suitable cure conditions so that the first and second prepolymer components mix and react to produce the polyimide composite structure.

Abstract: Tailorable polyimide resin systems suitable for processing by resin transfer molding (RTM) and resin infusion (RI) methods. An exemplary resin system includes first and second prepolymer components present in respective amounts to provide the desired processibility. The cured polyimide system exhibits high glass transition temperature and other properties required for gas turbine engine applications. The first and second prepolymer components independently comprise a monomeric mixture or a reaction product of a diamine component, a dianhydride component, and an end group component.

Abstract: A thermosetting composition comprising (a) 97.9 to 40 percent by weight of at least one bis(dihydrobenzoxazine) prepared by the reaction of an unsubstituted or substituted bisphenol with at least one unsubstituted position ortho to each hydroxyl group, formaldehyde and a primary amine; (b) 2 to 50 percent by weight of at least one organic polyamine; and (c) 0.1 to 10 percent by weight of at least one curing catalyst, selected from the group of carboxylic acids, sulfonic acids and phosphonic acids having at least two acid groups and no other reactive groups; wherein the percent by weight refer to the total amount of components (a), (b) and (c) in the composition, with the proviso that (a), (b) and (c) add up to 100 percent by weight; and (d) and optionally other components. Cured products of these compositions show valuable chemical, physical and mechanical properties.

Abstract: The present invention relates to a negative photosensitive polyimide polymer having a repeating unit of formula (1) as a polymerized unit: wherein G, Q and P* are as defined in the specification. The polyimide polymer of the present invention is developable in an aqueous alkaline solution, and has the properties associated with an insulating layer and photoresist.

Abstract: This invention relates to the polymerisation of five-, six- or seven-membered cyclic carbonates by ring-opening polymerisation in the presence of a system comprising a metal salt such as triflate, triflimidate, acetylacetonate or carboxylate and an alcohol.

Abstract: The benefits of liquid crystal polymers and polyetherimides are combined in an all-aromatic thermoplastic liquid crystalline polyetherimide. Because of the unique molecular structure, all-aromatic thermotropic liquid crystal polymers exhibit outstanding processing properties, excellent barrier properties, low solubilities and low coefficients of thermal expansion in the processing direction. These characteristics are combined with the strength, thermal, and radiation stability of polyetherimides.

Abstract: A polyimide precursor composition includes an oligomer or polymer having a substituted or unsubstituted carbonyl group only in a side chain and a diamine compound. A method of manufacturing a polyimide, and a polyimide film, are also disclosed.

Abstract: Copolymers comprising recurring units (A) of one or more of the general structural formulae -D-G-Arb-G-, -G-D-G-Arb- and/or -D-G- on one hand, and recurring units (B) of one or more of the general structural formulae —Ara-G-Arb-G-, -G-Ara-G-Arb- and/or —Ara-G- on the other hand, wherein D is a dibenzodiazocine-containing divalent group, Ara is a dibenzodiazocine-free divalent group containing a sulfone unit and/or a ketone unit, Arb is a dibenzodiazocine-free divalent group, and G is an ether or a thiether group. Preferably, recurring units (A) are of the general structural formula -D-G-Arb-G- and recurring units (B) are of the general structural formula —Ara-G-Arb-G-. Method for the preparation of the copolymers, compositions and articles made of the copolymers are also part of the invention.

Abstract: The invention relates to a condensation product obtainable by reaction of a1) at least one bicyclic or polycyclic aromatic or heteroaromatic, where the bicyclic or polycyclic aromatic or heteroaromatic is substituted by at least one carboxyl group (—COOH), and where the carboxyl group can be present in salt form, a2) at least one carbonyl compound, a3) if appropriate at least one sulfonating agent, a4) at least one urea derivative, and a5) if appropriate at least one further aromatic or heteroaromatic, or a physiologically tolerable salt thereof.

Abstract: Featured are novel heterocycle substituted hydroquinones, aromatic copolymers and homopolymers bearing main and side chain polar pyridine units. These polymers exhibit good mechanical properties, high thermal and oxidative stability, high doping ability and high conductivity values. These novel polymers can be used in the preparation and application of MEA on PEMFC type single cells. The combination of the above mentioned properties indicate the potential of the newly prepared materials to be used as electrolytes in high temperature PEM fuel cells.

Abstract: Featured are novel heterocycle substituted hydroquinones, aromatic copolymers and homopolymers bearing main and side chain polar pyridine units. These polymers exhibit good mechanical properties, high thermal and oxidative stability, high doping ability and high conductivity values. These novel polymers can be used in the preparation and application of MEA on PEMFC type single cells. The combination of the above mentioned properties indicate the potential of the newly prepared materials to be used as electrolytes in high temperature PEM fuel cells.

Abstract: New aromatic polyether type copolymers bearing main chain pyridine and side chain pyridine or pyrimidine units, which exhibit good mechanical properties, high thermal and oxidative stability, high doping ability and high conductivity values. The polymers are useful in the preparation and application of MEA on PEMFC type single cells. The polymers are, further, particularly suitable for use in high temperature PEM fuel cells.

Abstract: A process for preparing a sulfonate terminated polyarylate comprises blending a polyarylate resin with an organic compound to form a reaction mixture, wherein the organic compound contains at least one aliphatic primary amine functional group and at least one other functional group selected from the group consisting of sulfonic acids, sulfonic acid salts, and mixtures thereof, and heating the reaction mixture to a temperature of 225 to 400° C. The temperature of heating is above the glass transition temperature of the polyarylate resin. Sulfonate terminated polyarylates and compositions prepared using the above process, and articles comprising the sulfonate terminated polyarylate compositions, are also disclosed.

Abstract: This invention relates to a novel polyimide silicone having an alcoholic hydroxyl group and a process for the preparation thereof. The polyimide of the invention having a primary alcoholic hydroxyl group is represented by the following general formula (1), wherein X represents a tetravalent organic group, Y represents a divalent group having at least one monovalent group selected from the group consisting of a phenolic hydroxyl group and a carboxyl group, with at least one being a divalent organic group having an alcoholic hydroxyl group, Z represents a divalent organic group, W represents a divalent organic group having an organosiloxane structure, k is a positive number, and each of m and n is equal to 0 (zero) or a positive number, with 0.1?k/(k+m+n)?1, 0?m/(k+m+n)?0.8, 0?n/(k+m+n)?0.8.

Abstract: The present invention relates to aromatic polyether resins crosslinked with amic acid or imide side chain, and more particularly, to the aromatic polyether resin crosslinked by amic acid or imide side chain, which is produced by heat curing of amic acid, wherein introduction of imide groups to the basic backbone provides excellent chemical resistance as well as heat resistance and improves surface roughness when coated as a thin film so that it can be suitable for films and flexible display plate substrate.

Abstract: A thermosetting composition comprising (a) 97.9 to 40 percent by weight of at least one bis(dihydrobenzoxazine) prepared by the reaction of an unsubstituted or substituted bisphenol with at least one unsubstituted position ortho to each hydroxyl group, formaldehyde and a primary amine; (b) 2 to 50 percent by weight of at least one organic polyamine; and (c) 0.1 to 10 percent by weight of at least one curing catalyst, selected from the group of carboxylic acids, sulfonic acids and phosphonic acids having at least two acid groups and no other reactive groups; wherein the percent by weight refer to the total amount of components (a), (b) and (c) in the composition, with the proviso that (a), (b) and (c) add up to 100 percent by weight; and (d) and optionally other components. Cured products of these compositions show valuable chemical, physical and mechanical properties.

Abstract: Polymers and copolymers of formula I: in which m is typically 30 to 500 and n is 0 to 500; Ar is for example, 1,2-phenylene, 1,3-phenylene, 1,4-phenylene, or 2,6-pyridylene; Ar2 and Ar3 are selected from various bivalent aryl and heteroaryl groups; and X is for example, the bivalent SO2 or CO, have high temperature properties which make them useful as films, matrices in carbon fiber reinforced composites and high performance adhesives; processes for preparing the polymers and copolymers employ a novel C—N coupling reaction.

Abstract: An ionically conductive polymer has the chemical structure 1 as shown herein. Examples of the polymer include 4,4?-(4-(1H-benzo[d]imidazol-2-yl)butane-2,2-diyl)diphenol, sulfonated poly(aryl ether sulfone) containing benzimidazole backbone, sulfonated poly(aryl ether sulfone) containing carboxylic acid backbone, and sulfonated poly(aryl ether sulfone) containing benzimidazole backbone from carboxylic acid containing sulfonated poly(aryl ether sulfone). The polymer has intrinsic ion conducting properties so that it is effectively conductive even under low water conditions. In one embodiment, the polymer has an ionic conductivity of at least 1×10?5 S/cm at a temperature of 120° C. when the polymer is substantially anhydrous.

Abstract: A copolycarbonate-polyester, comprising units of formula wherein at least 60 percent of the total number of R1 groups are divalent aromatic organic radicals and the balance thereof are divalent aliphatic or alicyclic radicals; units of formula wherein T is a C7-20 divalent alkyl aromatic radical or a C6-20 divalent aromatic radical, and D is a divalent C6-20 aromatic radical; and units of the formula wherein R2 and R3 are each independently a halogen or a C1-6 alkyl group, R4 is a methyl or phenyl group, each c is independently 0 to 4, and T is as described above.

Abstract: A dihalobiphenyl compound represented by the formula (1): wherein A represents an amino group substituted with one or two C1-C20 hydrocarbon groups or a C1-C20 alkoxy group, R1 represents a fluorine atom, a C1-C20 alkyl group, etc., X1 represents a chlorine atom, a bromine atom or an iodine atom, an k represents an integer of 0 to 3, and a polyarylene comprising a repeating unit represented by the formula (2): wherein A, R1 and k represent the same meanings as defined above.

Abstract: The invention relates to a method of preparing omni-meta aromatic polysulfonamide fiber which comprises three steps of preparing spinning dope, wet spinning and post treating. The said step of preparing spinning dope comprises the following steps: (1) dissolving 3,3?-diaminodiphenyl sulphone in a polar organic solvent and cooling it to ?20˜20° C.; (2) adding m-phthaloyl chloride of the same mole of the 3,3?-diaminodiphenyl sulphone to carry out a polymerization reaction; (3) then adding an inorganic base of the same mole of 3,3?-diaminodiphenyl sulphone to neutralize the hydrogen chloride produced during the polymerization reaction. The spinning dope thus prepared has a polymer solid content of 10%-20%. The fiber prepared according to the method in the present invention has a greatly improved crimpability, and evidently increased elongation at break comparing with the conventional aromatic polysulfonamide fiber, so that the spinnability of resultant yarn is improved.

Abstract: Featured are novel heterocycle substituted hydroquinones, aromatic copolymers and homopolymers bearing main and side chain polar pyridine units. These polymers exhibit good mechanical properties, high thermal and oxidative stability, high doping ability and high conductivity values. These novel polymers can be used in the preparation and application of MEA on PEMFC type single cells. The combination of the above mentioned properties indicate the potential of the newly prepared materials to be used as electrolytes in high temperature PEM fuel cells.

Abstract: An object of the present invention is to obtain a novel polymeric material capable of forming a solid polymer electrolyte excellent not only in processability, solvent resistance and durability/stability but also in ion conductivity by introducing sulfonic acid group or phosphonic acid group into a polybenzazole compound having excellent properties in view of heat resistance, solvent resistance, mechanical characteristics and the like. Means attaining the object of the present invention is a polybenzazole compound including an aromatic dicarboxylic acid bond unit having sulfonic acid group and/or phosphonic acid group and satisfying either a condition that inherent viscosity measured in concentrated sulfuric acid is in the range of 0.25 to 10 dl/g or a condition that inherent viscosity measured in a methanesulfonic acid solution is in the range of 0.1 to 50 dl/g.

Abstract: High heat polyethersulfone compositions are provided which possess unexpectedly high glass transition temperatures. The polyethersulfone compositions comprise structural units derived from phthalimide bisphenols such as 3,3-bis(4 -hydroxyphenyl)-N-phenylphthalimide, and structural units derived from at least one biphenyl-bissulfone such as 4,4?-bis((4-chlorophenyl)sulfonyl)-1,1?-biphenyl. The novel polyethersulfone compositions may further comprise structural units derived from one or more biphenols such as 4,4?-biphenol, bisphenols such as BPA, or other electrophilic sulfone monomers, such as bis(4-chlorophenyl)sulfone. In one embodiment, the polyethersulfone composition of the present invention comprises structural groups derived exclusively from 3,3-bis(4-hydroxyphenyl)-N-phenylphthalimide, and 4,4?-bis((4-chlorophenyl)sulfonyl)-1,1?-biphenyl and exhibits a single glass transition of greater than 300° C.

Abstract: A method of preparing a capped poly(arylene ether) resin includes reacting a capping agent with a blend of two or more poly(arylene ether) resins having different intrinsic viscosities. Cured compositions prepared from these capped poly(arylene ether) resins exhibit improved balances of stiffness, toughness, and dielectric properties compared to compositions with two or more separately capped and isolated poly(arylene ether) resins.

Abstract: A material for dielectric films is a polymerizable composition containing an organic solvent, and an adamantanepolycarboxylic acid derivative represented by following Formula (1): wherein X is hydrogen atom, a hydrocarbon group or R4; R1, R2, R3 and R4 and are each independently a protected or unprotected carboxyl group, etc.; and Y1, Y2, Y3 and Y4 are each independently a single bond or a bivalent aromatic cyclic group; and an aromatic polyamine derivative represented by following Formula (2): wherein Ring Z is a monocyclic or polycyclic aromatic ring; and R5, R6, R7 and R8 are each a substituent bound to Ring Z and are each independently a protected or unprotected amino group, etc., dissolved in the organic solvent.

Abstract: A diamine compound represented by the formula (1): wherein R1 is a trivalent organic group, each of X1 and X2 is a bivalent organic group, X3 is an alkyl or fluoroalkyl group having from 1 to 22 carbon atoms, or a cyclic substituent selected from aromatic rings, aliphatic rings, heterocyclic rings and their substituted groups, and n is an integer of from 2 to 5. And, a polyimide precursor and a polyimide synthesized by using the diamine compound; and a treating agent for liquid crystal alignment containing the polyimide precursor and/or the polyimide.

Abstract: A method for preparation of a sulfonic and or sulfonic acid salt containing polyimide resins comprising melt reaction of a polyimide resin with an organic compound, wherein the organic compound contains at least one aliphatic primary amine functionality and at least one other functionality selected from the group consisting of sulfonic acids, sulfonic acid salts or mixtures thereof.

Abstract: The invention relates to the following: a method for step-by-step alkylation of primary polymeric amines by step-by-step deprotonation with a metallo-organic base and a subsequent reaction with an alkyl halide; a method for modifying tertiary polymeric amines with other functional groups; polymers with secondary/tertiary amino groups and with quaternary ammonium groups; polymers with secondary/tertiary amino groups and other functional groups, especially cation exchanger groupings; membranes consisting of the above polymers, either non-crosslinked or ionically or covalently cross-linked; acid-base-blends/membranes, and a method for producing same, consisting of basic polymers with polymers containing sulphonic acid, phosphonic acid or carboxyl groups; the use of ion exchanger polymers as membranes in membrane processes, e.g.

Abstract: Polyimide resins that are suitable for processing by resin transfer molding (RTM) and resin infusion (RI) methods at reduced processing temperatures are provided. The inventive RTM and RI processable polyimide resins exhibit melting at temperatures of less than about 200° C. and melt viscosities at 200° C. of less than about 3000 centipoise. A process for synthesizing the inventive resins is also provided, as is a fiber-reinforced composite material. The fiber-reinforced composite material employs the inventive polyimide resin as its resin matrix and demonstrates good heat resistance and mechanical properties.

Abstract: Provided are a sulfonated polymer capable of high hot water resistance even if it has an increased amount of the sulfonic groups introduced therein, and a solid polymer electrolyte containing the sulfonated polymer that has high proton conductivity and excellent generating performance. The sulfonated polymer has repeating units represented by the formula (1?): wherein B's are each independently an oxygen or a sulfur atom, R1 to R3 may be the same or different and are selected from a hydrogen atom, a fluorine atom, a nitrile group and an alkyl group, n is an integer of 2 or greater, and Q is a structure represented by the formula (q): wherein A is independently a divalent atom or organic group or a direct bond, and R4 to R11 may be the same or different and are selected from a hydrogen atom, a fluorine atom, an alkyl group and an aromatic group.

Abstract: A material for dielectric films is a polymerizable composition containing an adamantanepolycarboxylic acid represented by following Formula (1): wherein X is a hydrogen atom, a carboxyl group or a hydrocarbon group; and Y1, Y2, Y3 and Y4 are the same as or different from one another and are each a single bond or a bivalent aromatic cyclic group; an aromatic polyamine represented by following Formula (2): wherein Ring Z is a monocyclic or polycyclic aromatic ring; and R1 and R2 are each a substituent bound to Ring Z, are the same as or different from each other and are each an amino group, a mono-substituted amino group, a hydroxyl group or a mercapto group; and a solvent other than ketones and aldehydes, in which the adamantanepolycarboxylic acid and aromatic polyamine are dissolved in the solvent

Abstract: In the process of the present invention, a solvent-soluble polyimide is produced by polycondensing at least one tetracarboxylic acid component with at least one diamine component in a solvent in the presence of a tertiary amine. The tetracarboxylic acid component is selected from the group consisting of tetracarboxylic dianhydrides represented by the following formula 1: wherein R is as defined in the specification, and tetracarboxylic acids and their derivatives represented by the following formula 2: wherein R and Y1 to Y4 are as defined in the specification. Unlike the conventional techniques using an excessively large amount of a chemical imidation agent such as acetic anhydride and a chemical imidation catalyst such as triethylamine, in the process of the present invention, the solvent-soluble polyimide having a high polymerization degree is easily produced in a solvent with good productivity by using only a catalytic amount of the tertiary amine.

Abstract: This invention relates to the composition and a solvent-free process for preparing novel imide oligomers and polymers specifically formulated with effective amounts of a dianhydride such as 2,3,3?,4-biphenyltetra carboxylic dianydride (a-BPDA), at least one aromatic diamine and an endcapped of 4-phenylethynylphthalic anhydride (PEPA) or nadic anhydride to produce imide oligomers that possess a low-melt viscosity of 1-60 poise at 260-280° C. When the imide oligomer melt is cured at about 371° C. in a press or autoclave under 100-500 psi, the melt resulted in a thermoset polyimide having a glass transition temperature (Tg) equal to and above 310° C. A novel feature of this process is that the monomers; namely the dianhydrides, diamines and the endcaps, are melt processable to form imide oligomers at temperatures ranging between 232-280° C. (450-535° F.) without any solvent.