Abstract: The present invention provides for shaped articles made from novel heat stable polyamide-imide polymers having excellent flow properties which render them more readily processible into fibers, films, sheets and other molded articles. The polymers are prepared by forming the polycondensation product of one or more aromatic diamines, one or more trifunctional acid anhydride monomers, and one or more tetrafunctional aromatic dianhydrides, at least one of said monomers containing the groups ##STR1## linking two aromatic moieties, wherein R is CF.sub.3 or phenyl. In addition to improved flow properties, the polyamide-imide polymers of this invention also exhibit improved solubility properties in most organic solvents, improved resistance to attach by chlorinated solvents such as trichloroethylene as compared with polyimides, improved hydrophobic properties as well as excellent thermal properties including resistance to thermooxidative degradation.

Abstract: A solvent-soluble polyimide obtained from an exo-form dicarboxylic acid anhydride with an aromatic diamine, e.g. 2,2,-bis[4-(4-aminophenoxy)phenyl]propane is improved in film-forming properties and transparency, and particularly suitable for producing an orientation controlling film in a liquid crystal display device.

Abstract: The present invention provides novel heat stable polyamide-imide polymers having excellent flow properties which render them more readily processible into fibers, films, sheets and other molded articles. The polymers are prepared by forming the polycondensation product of one or more aromatic diamines and one or more trifunctional acid anhydride monomers, at least one of said diamine monomers containing the group ##STR1## linking two aromatic moieties, wherein R is CF.sub.3 or phenyl. In addition to improved flow properties, the polyamide-imide polymers of this invention also exhibit improved solubility properties in most organic solvents, improved resistance to attack by chlorinated solvents such as trichloroethylene as compared with polyimides, improved hydrophobic properties as well as excellent thermal properties including resistance to thermooxidative degradation.

Abstract: Described are flexible polyimide foams having enhanced compression characteristics and softness for use in the manufacture of seat cushions and methods for the production of such foams and precursors therefor. These foams are produced from novel polyimides prepared by reaction of at least one aromatic or heterocyclic primary diamine with a mixture of at least two organic tetracarboxylic acids or derivatives thereof, at least one of which is from 1 to 40 mol percent of a 2-(vicinal-dicarboxycyclohexenyl)succinic acid or derivative thereof and a second of which is an aromatic tetracarboxylic acid or derivative thereof.

Abstract: The present invention provides novel heat stable polyamide-imide polymers having excellent flow properties which render them more readily processible into fibers, films, sheets and other molded articles. The polymers are prepared by forming the polycondensation product of one of more aromatic diamines, one or more trifunctional acid anhydride monomers, and one or more tetrafunctional aromatic dianhydrides, at least one of said monomers containing the groups ##STR1## linking two aromatic moieties, wherein R is CF.sub.3 or phenyl. In addition to improved flow properties, the polyamide-imide polymers of this invention also exhibit improved solubility properties in most organic solvents, improved resistance to attack by chlorinated solvents such as trichloroethylene as compared with polyimides, improved hydrophobic properties as well as excellent thermal properties including resistance to thermooxidative degradation.

Abstract: A method is provided for enhancing the crystallization rate of certain polyetherimide to provide an improved molding mehod for making solvent resistant shaped thermoplastics. Polyetherimide blends containing crystallization rate enhancing agents such as bisimides or imide oligomers also are provided.

Abstract: The present invention is connected with a low-melting polyimide copolymer containing 30 to 90 mole % of an imide repeating unit represented by the following formula (I) and 10 to 70 mole % of an imide repeating unit represented by the following formula (II), and having a logarithmic viscosity number of 0.1 to 4 dl/g: ##STR1## wherein R.sup.1 is at least one of ##STR2## Furthermore, the present invention is connected with a method of preparing the low-melting polyimide copolymer.Since having a melting point of about 300.degree. to about 400.degree. C., the polyimide copolymer of the present invention has heat resistance and enables melt-moldings such as extrusion and injection molding.

Abstract: A polyamideimide having an inherent viscosity of above 0.48 which comprises a unit of the following formula (II) ##STR1## and a unit of the following formula (IV) ##STR2## as main units forming the molecular chains of the polyamideimide, and an intimate mixture of the polyamideimide and a plasticizing material for the polyamideimide.

Abstract: Described are flexible polyimide foams having enhanced compression characteristics and softness for use in the manufacture of seat cushions and methods for the production of such foams and precursors therefor. These foams are produced from novel polyimides prepared by reaction of at least one aromatic or heterocyclic primary diamine with a mixture of at least two organic tetracarboxylic acids or derivatives thereof, at least one of which is from 1 to 40 mol percent of a 2-(vicinal-dicarboxycyclohexenyl)succinic acid or derivative thereof and a second of which is an aromatic tetracarboxylic acid or derivative thereof.

Abstract: A method is provided for making 9,10-dithiaanthracene-2,3,6,7-tetracarboxylic acid dianhydride. Polyimides having improved oxidative stability also are provided which can be made intercondensing organic diamine and the aforementioned dianhydride or a dianhydride mixture.

Abstract: Described are flexible polyimide foams having enhanced compression characteristics and softness for use in the manufacture of seat cushions and methods for the production of such foams and precursors therefor. These foams are produced from novel polyimides prepared by reaction of at least one aromatic or heterocyclic primary diamine with a mixture of at least two organic tetracarboxylic acids or derivatives thereof, at least one of which is from 1 to 40 mol percent of a 2-(vicinal-dicarboxycyclohexenyl)succinic acid or derivative thereof and a second of which is an aromatic tetracarboxylic acid or derivative thereof.

Abstract: The present invention relates to compositions comprising(a) at least one polyimide having an inherent viscosity of at least 0.1 dl/g (measured at 25.degree. C. on a 0.5% by weight solution in N-methylpyrrolidone) and containing at least 50 mol % of structural units of the formula I ##STR1## in which m and p independently of one another are integers from 0 to 4, n is an integer from 0 to 3, R.sup.1 and R.sup.2 independently of one another are C.sub.1 -C.sub.6 -alkyl or C.sub.1 -C.sub.6 -alkoxy and R.sup.3 is a divalent radical of an aromatic diamine which is substituted in at least one ortho-position relative to at least one N atom by alkyl, alkoxy, alkoxyalkyl, cycloalkyl or aralkyl or in which two adjacent C atoms of the aromatic radical are substituted by alkylene, and(b) at least one aromatic polyimide which is soluble in organic solvents and photocrosslinkable and which contains at least 50 mol %, relative to the total quantity of diamine units, of radicals R.sup.

Abstract: Cyclic imides are prepared by the reaction of a bis(dicarboxyphenyl) sulfide or functional derivative thereof, and optionally a second tetracarboxylic acid or functional derivative thereof such as 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride, with a diamine having a spirobiindane nucleus. The cyclic imides may be converted to linear polyimides by reaction with a basic alkali metal sulfide.

Abstract: Described are flexible polyimide foams having enhanced compression characteristics and softness for use in the manufacture of seat cushions and methods for the production of such foams and precursors therefor. These foams are produced from novel polyimides prepared by reaction of at least one aromatic or heterocyclic primary diamine with a mixture of at least two organic tetracarboxylic acids or derivatives thereof, at least one of which is from 1 to 40 mol percent of a 2-(vicinal-dicarboxycyclohexenyl)succinic acid or derivative thereof and a second of which is an aromatic tetracarboxylic acid or derivative thereof.

Abstract: A curable composition comprising (a) a curable polyimide soluble in organic solvents and (b) a polymerization initiator as essential components, said polyimide consisting of recurring units represented by the formula ##STR1## wherein, each of X, X.sub.1, X.sub.2, X.sub.3 and X.sub.4 is a tetravalent carbocyclic or heterocyclic residue, each of Y.sub.1, Y.sub.2, and Y.sub.3 is a divalent carbocylic or heterocyclic residue, at least one of Z.sub.1 and Z.sub.2 is a residue having a reactive carbon-carbon double bond, and each of l, m, and n is an integer from 0 to 20, preferably from 0 to 10. The polyimide may include (a) polyacrylate compounds (b) bis-imide compounds (c) photosensitive polyimide precursors (d) oxime initiators (e) a 3 component sensitizer of a phenone compound, a mercapto compound, and an arylamine-alkanol, or mixtures of a,b,c,d, and e.

Abstract: A polyimide powder which can provide a molding having excellent both strength and heat resistance by heat-press molding, and a method for producing such polyimide powder are disclosed. The polyimide powder comprises spherical polyimide particles having a particle size distribution of from 0.5 to 20 .mu.m and a mean particle diameter of from 1 to 15 .mu.m, and comprising a repeating unit represented by the formula ##STR1## wherein Ar represents an aromatic diamine residue.

Abstract: Novel polymers and molding compositions are prepared from acyl halide derivatives of tricarboxylic acids and diamines and about 1 to about 10 percent by weight of phthalic anhydride, trimellitic anhydride or aniline moieties. The polymers are useful in engineering plastics.

Abstract: Polyamides containing free amino groups and suitable for use as curing agents for polyepoxy compounds are derived from (a) a polybasic acid component comprising polymeric fatty acid together with from 10 to 90 mole %, based on the total acid component, of one or more aromatic dicarboxylic acids containing two carboxylic acid groups and one benzene ring, each carboxylic acid group being directly linked to a benzene ring, and (b) a polyamine component containing at least 50 mole % of one or more aliphatic polyamines containing at least three amino groups per molecule.Cured resinous composition may be prepared by reacting the polyamides with polyepoxy compounds and curable composition contain the polyamides together with polyepoxy compounds.

Abstract: Carboxy-terminated prepolymers are prepared by the reaction of a diamine, preferably an aromatic diamine, or a mixture thereof with a triamine, with a carboxy anhydride such as trimellitic anhydride and a dianhydride such as bisphenol A dianhydride. The prepolymers, or functional derivatives thereof, are then reacted with a diisocyanate or diamine, or a mixture thereof with a triisocyanate or triamine, preferably an aromatic diisocyanate, to produce copolyamideimides. The products prepared using triamines or triisocyanates are crosslinked. Other products containing alkyl or alicyclic groups attached to aromatic radicals can be oxidatively crosslinked, e.g., by heating in air.

Abstract: Melt-fusible copolyimides based on pyromellitic anhydride and two defined classes of aromatic diamines, at least one diamine of each class being incorporated into the polyimide, each diamine class being present in an amount of 10-90 mole percent of the total diamine content (100 mole percent), melt below about 400.degree. C. and can be fabricated into articles, or can be applied to either fibrous or nonfibrous substrates to make prepregs, tapes, etc., which then are shaped into final articles, such as printed circuit boards or aircraft panels.

Abstract: Novel polymers and molding compositions are prepared from acyl halide derivatives of tricarboxylic acids and diamines and about 1 to about 10 percent by weight of phthalic anhydride, or trimellitic anhydride or aniline moieties. The polymers are useful in engineering plastics.

Abstract: A process for the manufacture of polyamides, polyamide-imides and polyimides which process comprises preparing a salt of an aliphatic or aromatic diamine or a mixture of these and di, tri or tetracarboxylic acid or mixture of these or their corresponding anhydride by reacting both feedstocks at a temperature of about 300.degree. to 500.degree. F. in a solvent medium provided the water content of the resulting solution is below 25% water by weight the resulting salt solution is subjected to a pressure of about 1500-3000 psig and is then passed through a preheat zone where the temperature is increased to about 625.degree. F., the total residence time is kept at about 25 to about 50 seconds. The reactants are flashed through a control valve or nozzle to give an aerosol mist at a pressure of about 0-400 psig, the polymerization is further carried out in a flash reactor with a high heat flux and with wall temperatures of about 600.degree. F. to about 1000.degree. F. and melt temperatures of about 500.degree. F.

Abstract: Methods of making water soluble polyimide resin compositions. A carboxy terminated bisimide is prepared by reacting a suitable aromatic dianhydride with a suitable oxoimine. The bisimide is then mixed with a sufficient quantity of a water soluble solvent to dissolve the bisimide. Water is added to make a solution of the desired viscosity. An aromatic diamine is added to this water solution. To the mixture is added a suitable quantity of a tertiary amine to stabilize the resin. The solution is coated onto a surface and dried to produce a smooth, flexible coating. The coating can then be heated to an appropriate temperature to produce a fully polymerized coating which is thermally stable and resistant to oils and solvents.

Abstract: A polyamic acid copolymer forming a polyimide comprising, in mole percent, from greater than 5 percent to about 45 percent pyromellitic dianhydride, from about 5 percent to about 45 percent oxydiphthalic dianhydride, and about 50 percent of oxydianiline. Polyimides formed by curing the copolymer are also disclosed as is a process for forming a heat sealable coating on or dielectric isolation layer within electronic circuitry using the copolymer.

Abstract: A soluble polyimide derived from dehydration of a polyamic acid which is the liquid phase condensation reaction product of a solution in aprotic solvent of approximately equimolar amounts of aromatic dianhydride and aromatic diamine. At least 50 mole % of the dianhydride must have ring linkages which prevent conjugation between the rings and at least 20 mole % of the diamine must contain electron withdrawing groups.

Abstract: An aromatic polyimide composition usable for producing shaped articles, for example, films, or as varnish, lacquer, or bonding agent, comprises a high molecular weight aromatic polyimide resin which is a polycondensation-imidization product of an aromatic tetracarboxylic acid component comprising 50 molar % or more of 3,4,3',4'-biphenyltetracarboxylic acid, anhydride, salt, or ester with an aromatic diamine component including 50 molar % or more of 4,4'-diaminodiphenylether, and which is dissolved in a mixed solvent consisting essentially of 10% by weight or more of a first solvent component selected from naphthol and resorcin and the balance of a second solvent component selected from phenol and cresols.

Abstract: An organic solvent-soluble photosensitive polyimide resin having excellent heat resistance and electrical and mechanical properties, comprising a copolycondensation product of a biphenyltetracarboxylic acid component with an aromatic diamine component consisting of 40 to 90 molar % of a diamine compound of the formula (I) and 10 to 60 molar % of a diaminodiphenylether compound of the formula (II), ##STR1## wherein X=--CO--O-- or --CH.sub.2 --O--, R.sub.1 and R.sub.2 =an organic residue having an ethylenically unsaturated radical, and R.sub.3 =H or --NHCOR.sub.2.

Abstract: Polyimide prepolymers having excellent heat resistance can be prepared in one stage by the reaction of polyamines and aromatic double bond-containing dicarboxylic acids or derivatives thereof in the presence of oxide compounds of phosphorus without isolating any intermediate in the course of said reaction.

Abstract: Cyclic dianhydrides and polyimides are prepared from maleic anhydride compounds and diolefins. The diolefins are alpha- , omega-linear diolefins of up to 100 carbon atoms or cyclic diolefins of up to 40 carbon atoms. The polyimides and copolyimides prepared from these cyclic dianhydrides are useful in films, fibers and coatings.

Abstract: Disclosed is a polyimide film consisting essentially of 2,2'-dichloro-4,4'-biphenylene pyromellitimide units. This film has high tensile characteristics and excellent heat resistance.

Abstract: A process for producing a polyimide precursor having excellent adhesion property and improved moisture resistance by polymerization of an organic tetracarboxylic acid component and a diamine is disclosed. A portion of the organic tetracarboxylic acid is reacted with an aminosilane compound in which H in an amino group is substituted with a monovalent organic group containing a hydrophobic aromatic ring, to produce a silane-modified polycarboxylic acid component and the resulting silane-modified polycarboxylic acid component is polymerized with a diamine together with the residual organic tetracarboxylic acid component.

Abstract: Novel carbinol-containing polyimides capable of self-crosslinking at low temperatures are prepared by reacting a molar excess of selected 3,3',4,4'-benzhydrol tetracarboxylic acid compounds (the tetraacid, diester-diacid, or (dianhydride) with polyfunctional polyamines (e.g. 4,4'-methylenedianiline, 1,6-hexanediamine, etc.) in an inert organic solvent at about 100.degree.-150.degree. C. The molar ratio of tetracarboxylic acid compound to diamine must be between 2:1 and 9:8. The polyimides may be crosslinked at less than 200.degree. C. via a reaction between the carbinol group(s) and the end group(s) of the polyimide.

Abstract: Polyamides, prepared from aralkylenediamines such as 5-phenyl-5-methyl-1,9-nonanediamine and dicarboxylic acids such as adipic or azelaic acid, optionally with a tricarboxylic acid for branching such as benzene tricarboxylic acid, are tough, clear resins useful for molding and fibers.

Abstract: Novel copolymers and molding compositions are prepared from acyl halide derivatives of dicarboxylic acids, acyl halide derivatives of tricarboxylic aromatic anhydrides and aromatic diamines and about 1 to about 10 percent by weight of phthalic anhydride moieties. Also, glass filled copolymers are prepared. The copolymers are useful as engineering plastics.

Abstract: Novel glass and graphite filled copolyimides and polyimides useful as engineering plastics are prepared. Also fibers and oriented fibers from the copolyimides and polyimides derived from tetramethylcyclobutane 1,2,3,4-tetracarboxylic dianhydride and diamines are disclosed.

Abstract: Novel polyimides and polyimides-amides, and molding compositions are prepared from novel dianhydrides such as tricyclo[6.4.0.0.sup.2,7 ] dodecane-3,6-diphenyl-1,8,4,5-tetracarboxylic acid dianhydride and tricyclo [6.4.0.0.sup.2,7 ] dodecane-1,8,4,5-tetracarboxylic acid dianhydride, dicarboxylic acids and diamines. The novel polyimides and polyimides-amides are useful as engineering plastics.

Abstract: This invention relates to copolyimides-polyamides prepared from mixtures of tetramethylcyclobutane-1,2,3,4-tetracarboxylic dianhydride (TMCDA), aromatic or aliphatic dianhydrides, and dicarboxylic acids or their esters or acid chlorides. These dianhydride-dicarboxylic acid mixtures are then reacted with aliphatic or aromatic diamines. These novel copolyimides-polyamides are useful in the preparation of molded articles, fibers, films, laminates and coatings.

Abstract: Novel polyimide-amide polymers and copolymers and molding compositions are prepared from tetramethylcyclobutane-1,2,3,4-tetracarboxylic dianhydride, dicarboxylic acids and mixtures of diamines. Also glass and graphite filled polymers are prepared. The polyimide-polyamide polymers and copolymers are useful as engineering plastics.

Abstract: This invention relates to novel polyimides-polyamides and copolyimides-polyamides prepared from the novel nonaromatic dianhydrides or mixtures of these with other dianhydrides. Tricyclo [4.2.1.0.sup.2,5 ] nonane-3,4-dimethyl-3,4,7,8-tetracarboxylic acid dianhydride (I). I is used to prepare novel polyimides-polyamides which are useful in preparing molded articles, fibers, laminates and coatings.

Abstract: .beta.-Hydroxybutyric acid polymers are extracted from micro-organism cells by contact with a solvent, such as 1,2-dichloroethane which is a poor solvent for the polymer once it has been precipitated.The solution obtained by extraction is caused to gel and then solvent is expelled by subjecting the gel to a deformation process. Expelled solvent is recovered for extraction of polymer from a further quantity of cells.

Abstract: An organic, high-molecular weight polyester containing substantially chain members of the formula--O--X--O--Y--wherein X is at least one member selected from the group consisting of ##STR1## and Y has the formula ##STR2## having an inherent viscosity of at least 1.0 dl/g, preferably at least 1.2 dl/g measured at 30.degree. C. in a solution of 0.5 g of the polyester in 100 ml of a mixture of 60% by weight of phenol and 40% by weight of 1,1,2,2-tetrachloroethane and whose films cast from a solution in a chlorinated organic solvent have an elongation at break of more than about 20%, preferably at least 40% measured according to ASTM D 882-75 b having excellent properties for electrical insulation as well as other fields.

Abstract: Novel copolyimides are prepared from mixtures of tetramethyl-cyclobutane-1,2,3,4-tetracarboxylic dianhydride and other aliphatic and aromatic dianhydrides. Their dianhydride mixtures are reacted with aliphatic or aromatic diamines to form copolyimides which are useful as engineering plastics.

Abstract: Novel polyimides, copolyimides and molding compositions are prepared from novel dianhydrides such as bicyclo[4.2.0]octane-2,5 diphenyl-7,8-dimethyl,3,4,7,8-tetracarboxylic dianhydride and bicyclo[4.2.0]octane-7,8-dimethyl-3,4,7,8-tetracarboxylic acid dianhydride. The novel polyimides are useful as engineering plastics. The novel dianhydrides are useful for the preparation of the polyimides.

Abstract: Novel polyimides and molding compositions are prepared from tricyclo[6.4.0.0.sup.2,7 ]dodecane-1,8,2,7-tetracarboxylic acid dianhydride. Also a novel dianhydride-,tricyclo[6.4.0.0.sup.2,7 ]dodecane-1,8,2,7-tetracarboxylic acid dianhydride is prepared by a novel photodimerization of 1-cyclohexene-1,2-dicarboxylic anhydride. The polyimides are useful as engineering plastics.

Abstract: Injection moldable copolymers are prepared from fully or partially acylated aromatic diamines and aromatic tricarboxylic anhydride compounds, aromatic dicarboxylic acids or mixtures of aromatic tricarboxylic acid anhydrides and aromatic dicarboxylic acids. These copolymers are useful for the preparation of injection molded articles and fibers.

Abstract: Novel polyimides and molding compositions are prepared from novel tricyclo[4.2.1.0.sup.2,5 ] nonane-3,4 dimethyl-3,4,7,8-tetracarboxylic acid dianhydride. The dianhydride is useful for the manufacture of polyimides which are useful as engineering plastics.

Abstract: Novel copolyimides and molding compositions are prepared from tetramethylcyclobutane-1,2,3,4-tetracarboxylic dianhydride and mixtures of diamines. Also glass and graphite filled polyimides are prepared. The polyimides are useful as engineering plastics.

Abstract: Novel polyimides, copolyimides and molding compositions are prepared from novel dianhydrides such as tricyclo[6.4.0.0.sup.2,7 ] dodecane-3,6-diphenyl-1,8,4,5-tetracarboxylic acid dianhydride and tricyclo[6.4.0.0.sup.2,7 ] dodecane-1,8,4,5-tetracarboxylic acid dianhydride. The novel polyimides are useful as engineering plastics. The novel dianhydrides are useful for the preparation of the polyimides. Other dianhydrides can be mixed with our novel dianhydrides to make novel copolyimides useful as engineering plastics.

Abstract: Novel polyimides and molding compositions are prepared from tetramethylcyclobutane-1,2,3,4-tetracarboxylic dianhydride and diamines. Also glass and graphite filled polyimides are prepared. The polyimides are useful as engineering plastics.

Abstract: Polyimides are prepared from acetylene substituted polyimide oligomers via an addition polymerization reaction which involves homopolymerization. These polymers exhibit low void content when cured and possess superior thermal stability characteristics and physical properties such as structural strength. One of their unique properties is their ability to be processed into useful articles at moderate pressures and temperatures.