Abstract: Aramid block copolymers which contains blocks whose polymer chains are flexible, and blocks whose polymer chains are flexible in solution and in undrawn polymer, but relatively rigid in drawn polymer, are disclosed. The aramids are tough materials with high modulus and tensile strength. Also disclosed is a process for making such block copolymers. The copolymers are useful as fibers and films, for example in ropes and composites.

Abstract: The invention relates to a polyamide resin composition comprising(A) nylon 4.6,(B) an aliphatic polyamide having a CH.sub.2 /NHCO ratio of from 6 to 11 and(C) a non-crystalline polyamide having a glass transition temperature of at least 100.degree. C. The composition has a decreased water absorption while retaining high mechanical strength, heat stability and chemical resistance. Dimensional stability and mechanical properties after water absorption are unexpectedly good.

Abstract: The present invention provides a heat stable film composition comprising polyepsiloncaprolactam and poly(epsiloncaprolactam-hexamethylene adipamide) copolymer which finds particular use in applications wherein the film is subjected heat for a prolonged period of time, such as in an oven or an autoclave.

Abstract: Soluble polymeric precursors having oligomeric imide and amic acid segments, which are suitable to form segmented, preferably insoluble, polyimide copolymers.

Abstract: Novel amino acid-derived polycarbonates and amino acid-derived diphenol compound starting materials from which the polycarbonates are polymerized. Polymer blends of the amino acid-derived polycarbonates with polyiminocarbonates prepared from identical amino acid-derived diphenol starting materials.

Abstract: The present invention provides (1) curable polyamide monomers represented by the formula: R.sup.1 -A.sup.1 -B.sup.1 -A.sup.2 -B.sup.2 -A.sup.3 -R.sup.2 where R.sup.1 and R.sup.2 are radicals selected from the group consisting of maleimide, substituted maleimide, nadimide, substituted nadimide, ethynyl, and (C(R.sup.3).sub.2).sub.2 where R.sup.3 is hydrogen with the proviso that the two carbon atoms of (C(R.sup.3).sub.2).sub.2 are bound on the aromatic ring of A.sup.1 or A.sup.3 to adjacent carbon atoms, A.sup.1 and A.sup.3 are 1,4-phenylene and the same where said group contains one or more substituents selected from the group consisting of halo, e.g., fluoro, chloro, bromo, or iodo, nitro, lower alkyl, e.g., methyl, ethyl, and propyl, lower alkoxy, e.g., methoxy, ethoxy, or propoxy, and fluoroalkyl or fluoroalkoxy, e.g., trifluoromethyl, pentafluoroethyl and the like, A.sup.

Abstract: Disclosed is a process for the preparation of a thermoplastic polymer blend comprising a first preformed thermoplastic polymer such as a polyester, polycarbonate, ABS graft polymer and the like and a second thermoplastic polyamide or polyamideimide. The second polymer is prepared from a diisocyanate and polycarboxylic compund selected from a dicarboxylic acid, tricarboxylic acid or anhydride thereof, or mixtures of these components by reactively processing the monomer components in the presence of the first polymer.

Abstract: Disclosed is a method for reducing compatibility problems when introducing a polyetheramine having a molecular weight of about 100 to 1000 into a nylon-6,6 polymer by prereacting the polyetheramine with two moles of adipic acid and reacting the adipic acid salt with nylon-6,6 and adipic acid.

Abstract: Polyimide copolymers are disclosed having the recurring structure ##STR1## wherein AR is AR.sub.1 or AR.sub.2, wherein AR.sub.1 is ##STR2## and wherein AR.sub.2 is ##STR3## provided that the molar ratio of AR.sub.1 to AR.sub.2 is 3:1 to 1:3, and wherein AR.sub.3 is ##STR4## These polyimides have unexpected properties which are useful in various electronic applications.

Abstract: This invention relates in general to the formation of fibers having a controlled molecular orientation prepared from rod-like extended chain aromatic-heterocyclic ordered polymers, and containing a binder in the micro-infrastructure. Such fibers have high tensile strength, modulus, and environmental resistance characteristics.

Abstract: Nylon compositions useful for molding and film applications with film properties and impact strength are made of a polyamide resin and a block copolymer of poly(amide-ether) of the formula ##STR1## where R is an alkyl or substituted alkyl group with from one to 12 carbons, n is an integer from 2 to 20, m is an integer from 2 to 6, and x and y are numbers from about 50 to about 30,000. In one embodiment, a nonpolymeric amide is added to the composition. Articles made from the claimed compositions have improved impact strength; films made from the compositions have improved drapeability over the unmodified resin, both at room temperature and after heat-aging. Reinforced compositions are obtained by including mineral and other reinforcing fillers, including glass fibers, in the extrusion process. The reinforced compositions exhibit improved impact characteristics.

Abstract: Novel block polyetheramides, well adapted for the usual thermoplastic elastomer applications, e.g., as molded or extruded shaped articles, films, sheaths, composites and the like, have the following general formula: ##STR1## in which D is the residue of an oligoamidediacid having an Mn ranging from 300 to 8,000 and/or the residue of the diacidic polymer chain limiter, PE is the residue of a polyetherdiol having an Mn ranging from 200 to 5,000, X is a linear or branched, (cyclo)aliphatic or aromatic hydrocarbon having form 3 to 20 carbon atoms, R.sub.1 and R.sub.2, which may be identical or different, are either OH or H, n is a number ranging from 0.1 to 10, and m is an average number ranging from 2 to 50, and are prepared by reacting, in the molten state, an oligoamidediacid A with an oligotherdiol B and a low molecular weight diacidic coupler C, the respective molar percentages a, b and c of which being such that:-5.ltoreq.a+c-b.ltoreq.5 and c.gtoreq.3.

Abstract: A process for modifying the dyeability of polyamide polymers is disclosed, the process involving the addition of co-fed polyamide flake of the same type of polyamide as the base polyamide with the co-fed flake having a significant effect on the final dyeability. The additive flake comprises high- or low-amine-end polyamide flake which is mixed and melted with the base polyamide to adjust the total number of amine ends in the polymer, thereby controlling the polymer dyeability.

Abstract: Polyphenylene ether- polyamide compositions having improved resistance to water absorption and swell are provided by incorporating therein a phenolic compound.

Abstract: The invention relates to a polyamide substrate with a high concentration of amine groups, and a method of transferring biological materials by adsorption onto said substrate.

Abstract: Polyamide-polyimide block copolymers having an average molecular weight M.sub.n of 1,000-50,000 and containing recurring units of the formula I--(PA)-(PI)--. (I)in which (PA) is a polyamide block having an average molecular weight M.sub.n of 300-20,000 and containing at least one (recurring) unit of the formula II ##STR1## in which R.sup.1 is ##STR2## and R.sup.2 is ##STR3## in which Q is a direct bond, --CH.sub.2 --, --CH.sub.2 CH.sub.2 --, ##STR4## --O--, --S--, --SO.sub.2 -- or --C(O)--, and n is 2-12, and Y.sub.a, Y.sub.b, Y.sub.c and Y.sub.d independently of one another are hydrogen, halogen or C.sub.1 -C.sub.4 alkyl, and (PI) is a polyimide block having an average molecular weight M.sub.n of 300-20,000 and containing at least one (recurring) unit of the formula III ##STR5## in which R.sup.3 is ##STR6## and Q and R.sup.2 are as defined above, with the proviso that 25-100 mol % of all the bridge members R.sup.2 are ##STR7## and the (cyclo)aliphatic proportion of bridge members R.sup.

Abstract: This invention is a semi-interpenetrating polymer network which includes a high performance thermosetting polyimide having a nadic end group acting as a crosslinking site and a high performance linear thermoplastic polyimide having the following repeating unit. ##STR1## wherein Z=C or SO.sub.2. Provided is an improved high temperature matrix resin which is capable of performing in the 200.degree. to 300.degree. C. range. This resin has significantly improved toughness and microcracking resistance, excellent processability, mechanical performance and moisture and solvent resistances.

Abstract: This invention relates to molding resin compositions, and more particularly relates to polyimide resin compositions having markedly improved molding ability in addition to excellent high temperature stability, chemical resistance and mechanical strength.The polyimide resin compositions of this invention comprises 99.9 to 50.0% by weight of the polyimide and 0.1 to 50.0% by weight of polyphenylene sulfide and/or aromatic polysulfone and/or aromatic polyetherimide high-temperature engineering polymer.

Abstract: Novel polyimide blends are formed of polyimide polymers each having moieties derived from dianhydride and diamine comonomers. The miscible blends of the present invention may be formed by selecting polyimide polymers having structurally different dianhydride-derived moieties, as well as structurally different diamine-derived moieties. More specifically, the blends of this invention include at least one polyimide polymer which is a reaction product of 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride, and 2,2-bis(3-aminophenyl) hexafluoropropane; and at least another polyimide polymer which is a reaction product of 2,2-bis(4-aminophenyl) hexafluoropropane and a dianhydride which is at least one selected from the group consisting of pyromellitic dianhydride, bis(3,4-dicarboxyphenyl) ether dianhydride, and 3,3',4,4'-benzophenone tetracarboxylic dianhydride.

Abstract: Blends of nylon 6,6, nylon 6 or nylon 6,6/6 copolymer which contain a randomly copolymerized cationic dye modifier are formed by melt blending such copolymer with a polyamide having 8 to 22 carbon atoms per amide link to form a block copolymer composition which is resistant to staining with acid dyes under ambient temperature and pH conditions.

Abstract: Nylon compositions useful for molding and film applications with film properties and impact strength are made of a polyamide resin and a block copolymer of poly(amide-ether) of the formula ##STR1## where R is an alkyl or substituted alkyl group with from one to 12 carbons, n is an integer from 2 to 20, m is an integer from 1 to 6, and x and y are numbers from about 50 to about 30,000. In one embodiment, a non-polymeric amide is added to the composition. Articles made from the claimed compositions have improved impact strength; films made from the compositions have improved drapeability over the unmodified resin, both at room temperature and after heat-aging. Reinforced compositions are obtained by including mineral and other reinforcing fillers, including glass fibers, in the extrusion process. The reinforced compositions exhibit improved impact characteristics.

Abstract: A high strength synthetic resin based structural material in which a polymer having coil-like molecules is uniformly mixed with a second polymer having rigid rod-like molecules. This material is made, basically, by dissolving a thermoplastic matrix polymer having coil-like molecules in a suitable solvent, adding thereto thermosetting polymer reactants which then form a prepolymer. The rigid rod prepolymer may then be partially cyclized through heat or by the use of a chemical agent in order to reduce chain conformations. Excess cyclizing agent can then be removed and the mixture can be heated to complete polymerization to produce a high strength structure with rigid rod-like molecules intimately blended with the matrix coil-like molecules.

Abstract: This invention is a process for making a semi-interpenetrating polymer network which includes a high performance thermosetting polyimide having a nadic end group acting as a crosslinking site and a high performance linear thermoplastic polyimide having the following repeating unit: ##STR1## Provided is an improved high temperature matrix resin which is capable of performing at 316.degree. C. in air for several hundreds of hours. This resin has significantly improved toughness and microcracking resistance, excellent processability and mechanical performance, and cost effectiveness.

Abstract: A polyamide resin which comprises a molten reaction mixture composed of 10-90% by weight of a polyamide (A1) from xylylenediamine and a C.sub.6 -C.sub.20 .alpha.,.beta.-linear aliphatic dibasic acid and 90-10% by weight of polyamide-6 (A2). The polyamide resin has either a single glass transition temperature differing from that of both (A1) and (A2), or two glass transition temperatures both differing from those of (A1) and (A2), the difference between the two temperatures being less than 10.degree. C. There are also provided a toughened polyamide resin composition comprising (A) 100 parts by weight of the polyamide resin, and (B) 5 to 80 parts by weight of an elastomer such as one composed mainly of a block-copolymerized elastomer which has been modified with an unsaturated dicarboxylic acid or a derivative thereof and hydrogenated.

Abstract: A composition of terminal-modified imide oligomers is disclosed. The composition comprises a flexible terminal-modified imide oligomer (A) and a rigid terminal-modified imide oligomer (B). The flexible terminal-modified imide oligomer (A) is selected from specific oligomers (I) and (II). The rigid terminal-modified imide oligomer (B) is selected from specific oligomers (III) and (IV). The oligomer (I) is formed from biphenyltetracarboxylic acid or its derivative, an aromatic diamine compound (a) and an unsaturated monoamine compound or an unsaturated carboxylic acid or its derivative. The oligomer (II) is formed from biphenyltetracarboxylic acid or its derivative and an unsaturated monoamine compound. The oligomer (III) is formed from biphenyltetracarboxylic acid or its derivative, an aromatic diamine compound (b) and an unsaturated monoamine compound or an unsaturated carboxylic acid or its derivative.

Abstract: A heat resistant polyamide film which is obtained by melt-extruding into a sheet a polyamide composition of a mixture of a preformed polyamide (A) composed of diaminobutane and adipic acid and a semi-aromatic polyamide (B) composed of a polyamide containing an aromatic dicarboxylic acid and an aliphatic diamine in an amount of at least 80% by weight of the polyamide-constituting components, in a weight ratio of (A):(B)=99.9:0.1 to 30:70, quenching the sheet, then biaxially stretching it at least 2.0.times.2.0 times, followed by heat setting at a temperature of at least 205.degree. C., and which has a heat distortion initiation temperature of at least 130.degree. C.

Abstract: A polyamide resin composition is used in powder coating and comprises a first polyamide having a carboxylic acid at 70 percent or above of the terminal groups thereof and a second polyamide having an amine at 70 percent or above of the terminal groups thereof.

Abstract: As-spun fibers from certain spinnable dopes of poly-p-phenylenebenzobisthiazole, poly-p-phenylenebenzobisoxazole, or poly-2,5-benzoxazole and thermoplastic polymers in certain mixed solvents are provided.

Abstract: A miscible blend comprising from about 5 to about 95 weight percent of a polybenzimidazole and from about 95 to about 5 weight percent of a polyamide-imide having fluorine-containing linking groups, total weight percent of the two polymers being 100. A process for preparing the blends comprises dissolving in a mutual solvent from about 5 to about 95 weight percent of the aromatic polybenzimidazole to about 95 to about 5 weight percent of the polyamide-imide having fluorine-containing linking groups, based on the total weight of those polymers and subsequently evaporating the solvent, thereby producing a dried blend of a polybenzimidazole and a polyamide-imide having fluorine-containing linking groups. The blends, particularly in the form of films, fibers or fibrets, may be post-treated with heat or sulfuric acid in order to minimize their shrinkage when subsequently subjected to heat and in order to increase their resistance to solvents and acid.

Abstract: Thermoplastic articles molded from amorphous polyamide and polycarbonate resin blends exhibit improved color when irradiated with ionizing radiation.

Abstract: A polymer powder is produced by separately melting two or more of polymers and monomers which are reactive with each other, spraying a mixture of the polymers and the monomers, while continuously mixing them with each other, the mixture being solid at a normal temperature, having a melt viscosity of 1,000 cps or below at 300 degree C., then cooling the sprayed mixture to obtain a powder thereof, and solid phase-polymerizing it to obtain the polymer powder. It is useful for powder coating.

Abstract: Soluble and/or fusible polyamidoimide-polyimide block copolymers with high heat stability, useful e.g. as molding powders for thermoplastic shaping films, fibers and laminates and process for their preparation are provided.

Abstract: Novel soluble polyamide-polyimide block copolymers having an average molecular weight M.sub.n of 1,000-50,000 and containing radicals of the formula ##STR1## in the polyimide blocks are described. The compounds can be crosslinked by heating to give insoluble products.

Abstract: A resinous substance obtained by reacting a rosin compound containing 1 to 10 equivalents of carboxylic groups per kilogram with triglycidyl isocyanurate. A process for producing it is also disclosed.

Abstract: A process for the preparation of crosslinked polymers by heating selected polyamide-polyimide block copolymers having an average molecular weight M.sub.n of 1,000-50,000 is described. In the compounds, at least 10 mol % of alkyl-substituted diaminodiphenylmethane groups, relative to the total amount of diamine radicals in the polyamide and polyimide blocks, are co-condensed.The uncrosslinked compounds are soluble in dipolar, aprotic solvents.

Abstract: A process for preparing polyimides having enhanced melt flow properties is described. The process consists of heating a mixture of a high molecular weight poly(amic acid) or polyimide with a low molecular weight amic acid or imide additive in the range of 0.05 to 15% by weight of additive. The polyimide powders so obtained show improved processability, as evidenced by lower melt viscosity by capillary rheometry. Likewise, films prepared from mixtures of polymers with additives show improved processability with earlier onset of stretching by TMA.

Abstract: Novel polyimide blends are formed of polyimide polymers each having moieties derived from dianhydride and diamine comonomers. The blends of the present invention may be formed by selecting polyimide polymers having structurally identical dianhydride-derived moieties, but structurally different diamine-derived moieties. Preferred miscible blends are formed wherein one of polyimides in the blend is the polymer condensation product of a dianhydride selected from 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride, 3,3',4,4'-diphenyl tetracarboxylic dianhydride, 3,3',4,4'-benzophenone tetracarboxylic dianhydride, bis(3,4-dicarboxyphenyl ether dianhydride, pyromellitic dianhydride, and mixtures thereof, and 2,2-bis(3-aminophenyl) hexafluoropropane, and another of the polyimides in the blend is the polymer condensation product of the same dianhydride and mixtures thereof noted above, and 2,2-bis(4-aminophenyl) hexafluoropropane.

Abstract: Flame resistant polymer blends contain a polyetherimide and an impact strength-enhancing amount of a siloxane-polyetherimide copolymer. These blends exhibit high impact strengths, good blow-moldability and injection moldability, amenability to thermoforming and very low flammability. The blends are particularly suited to the manufacture of aircraft cabin interior components.

Abstract: Improved polyamide-based compositions are provided which are particularly formulated for plasma-spray application to surfaces subjected to acidic conditions. The compositions include respective amounts of polyvinylidene fluoride, a polyamide (e.g., Nylon 11) and a compatable adhesive such as a nylon terpolymer adhesive.

Abstract: The invention relates to a resin composition comprising 100 parts by weight polyamide 4.6 resin and 2 to 200 parts by weight of a polyamide amide resin.The composition has improved HDT in wet state and improved impact resistance in dry state.

Abstract: The present invention relates to copolyimides of 100-70 mol % of recurring structural units of the formula I and 0-30 mol % of recurring structural units of the formula II ##STR1## in which z.sup.a is a tetravalent aromatic tetracarboxylic acid radical other than that of thioxanthonetetracarboxylic acid, the carboxyl groups thereof in each case being located in pairs in the ortho-position or peri-position relative to one another, and x.sup.a is a divalent aromatic diamine radical which, in at least one ortho-position relative to at least one nitrogen atom, carries a hydrocarbon substituent having at least one aliphatic .alpha.-hydrogen atom or x.sup.a is a radical of the formula III ##STR2## in which X.sup.c is a divalent aromatic diamine radical which, in ortho-position relative to both nitrogen atoms, carries in each case at least one mono-valent hydrocarbon substituent having at least one aliphatic .alpha.-hydrogen atom, n assumes an average value of 1.0 to 2.5, Z.sup.b is as defined for Z.sup.a and X.sup.

Abstract: This invention is a semi-interpenetrating polymer network which includes a high performance thermosetting polyimide having a nadic end group acting as a crosslinking site and a high performance linear thermoplastic polyimide having the following repeating unit: ##STR1## Provided is an improved high temperature matrix resin which is capable of performing at 316.degree. C. in air for several hundreds of hours. This resin has significantly improved toughness and microcracking resistance, excellent processability and mechanical performance, and cost effectiveness.

Abstract: Provided is a molecular composite comprising a rigid-rod aromatic heterocyclic polymer, a flexible, coil-like thermoplastic polymer and a thermosetting polymer.Also provided is a method for fabricating a molecular composite film or fiber which comprises the steps of forming a biphasic, stir opalescent solution of a rigid-rod aromatic heterocyclic polymer, a thermoplastic polymer, a thermosetting polymer and a solvent which is common to the three polymers, adding solvent to the solution until the solution becomes isotropic and stir opalescence has ceased to determine the critical concentration of polymers in the solvent, adding additional solvent to the solution so that the polymer concentration is below the critical concentration, extruding the solution into a non-solvent for the polymers to form the desired film or fiber, drying the film or fiber and hot drawing the film or fiber at a temperature above the Tg of the thermoplastic, but below the polymerization temperature (Tpoly) of the thermosetting resin.

Abstract: This invention is directed to a molded electrical device comprising an electrically conductive pathway and an insulating material, and capable of interconnecting with external circuitry said insulating material comprising a blend of a particular amorphous polymer and a particular crystalline thermoplastic polymer. Also, this invention is directed to a composition suitable for use as an insulating material in an electrical device comprising from about 35 to about 65 weight percent of an amorphous polymer selected from a polyarylethersulfone resin, a polyarylether resin, a polyetherimide or a polyarylate, and from about 65 to about 35 weight percent of a crystalline polymer selected from a poly(arylene sulfide), a polyester or a polyamide.

Abstract: A molecular composite system consisting essentially of a para-oriented benzobisazole polymer and a matrix polymer, poly(2-acrylamido-2-methylpropanesulfonic acid).

Abstract: This invention relates to molding resin compositions, and more particularly relates to polyimide resin compositions having markedly improved molding ability in addition to excellent high temperature stability, chemical resistance and mechanical strength.The polyimide resin composition of this invention comprises 99.9 to 50% by weight of the polyimide and 0.1 to 50% by weight of high temperature engineering polymer. The polyimide has recurring units of the following formula: ##STR1## wherein X is a sulfonyl radical or a carbonyl radical and R is a tetravalent radical selected from an aliphatic radical, alicyclic radical, monoaromatic radical, condensed aromatic radical and non-condensed aromatic radical.

Abstract: Higher yields of graft copolymer occur when a catalytic amount of base is present during the grafting reaction of a polyamide and a polyglutarimide. The resulting blends of ungrafted polyamide and polyglutarimide with higher graft-copolymer content, the graft copolymer being a polyamide-grafted poly(glutarimide)ionomer, exhibit improved toughness and clarity.

Abstract: A co-polyimide based upon a mixture of 4,4'-oxydiphthalic dianhydride (ODPA) and 3,4,3',4'-biphenyltetracarboxylic dianhydride (BPDA) as the dianhydride component and either 4,4'-oxydianiline (ODA) or paraphenylene diamine as the amine component is disclosed. The molar ratio between the ODPA and BPDA ranges from 3:1 to 1:3. The co-polyimide may either be formed as a random copolymer, or as a block copolymer where the blocks are based upon blocks of polymer containing ODPA and blocks of polymer containing BPDA provided that the molar ratios of ODPA and BPDA are in the ratio of 3:1 to 1:3.

Abstract: Disclosed herein are a polyamide filament comprising a polyamide resin composition which comprises an aromatic polyamide resin (A) produced by polymerizing a monomer containing not less than 85 wt % of an aromatic polyamide component composed of terephthalic acid, isophthalic acid and aliphatic diamine, and an aliphatic polyamide resin (B), and having a heat-shrinkage in boiling water of not less than 20%, and a process for producing the same.

Abstract: The present invention encompasses non-phase-separated thermoplastic block copolymers containing rigid rod PBZ blocks and thermoplastic PBZ blocks; dopes and compositions containing those block copolymers; a process for making shaped articles from thermoplastic block copolymers containing rigid rod PBZ blocks and thermoplastic PBZ blocks; and shaped articles made by that process.