Abstract: Inorganic-organic alloy polymer adduct composition for waste water treatment, having the formula:A.multidot.B.multidot.C.multidot.

Abstract: A novel series of articles useful as implants and prostheses and methods for their preparation and use are provided which utilize polyanhydride polymeric matrices as a general class of materials. These articles are biocompatible, non-inflammatory and degrade predictably into non-toxic residues after introduction in-vivo. The articles may be formed in any desired dimensions and configuration and may take specific shape as vascular or skin grafts, as biodegradable sutures or as orthopedic appliances such as bone plates and the like.

Abstract: A polyimide copolymer having a repeating unit of formula (I): ##STR1## wherein each of R.sub.1 and R.sub.2 is independently ##STR2## and R.sub.1 and R.sub.2 are different from each other, R.sub.0 is an aromatic group having a valency of 4, and m is a positive integer. The polyimide copolymer is excellent in heat resistance, mechanical properties (e.g., tensile elongation) and thermal dimensional stability.

Abstract: An aromatic hetero ring-containing polyimide comprising substantially equal equivalent amount of (1) structural units of Group 1 and (2) structural units of Group 2, wherein the structural units of Group 1 comprise (i) from 30 to 100 mol % of a unit of the formula: ##STR1## wherein X is S, O or NH, and (ii) from 0 to 70 mol % of a unit of the formula: ##STR2## wherein Ar.sub.1 is ##STR3## wherein each of y, y.sub.1, and y.sub.2 and y.sub.3 is a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom, and each of Z, Z.sub.1 and Z.sub.2 is a single bond, --O--, --CH.sub.2 --, ##STR4## --C--, --SO.sub.2 --, --C(CH.sub.3).sub.2 -- or --C(CF.sub.3).sub.2, and the structural units of Group 2 comprise (i) from 70 to 100 mol % of a unit of the formula: ##STR5## and (ii) from 0 to 30 mol % of a unit of the formula: ##STR6## wherein Ar.sub.2 is ##STR7## wherein Z, y and y.sub.

Abstract: A polyamide acid solution is disclosed, comprising a polyamide acid comprising as main components at least one recurring unit selected from the recurring units of the formulae (I) to (IV) and a recurring unit of formula (V), dissolved in an organic solvent comprising as a main component an amide type polar solvent having a boiling point of 170.degree. C. or less. The solution is capable of forming a polyimide film which has colorless transparency free from coloration and strong adhesion to a substrate for liquid crystal cell enough to prevent penetration of water into interface between the substrate and film. The solution is particularly useful for forming a liquid crystal oriented film.

Abstract: Aromatic oligomers, in particular arylene ketone and arylene sulfone oligomers, are prepared by reacting an appropriate monomer system in the presence of free Lewis acid and a complex between a Lewis acid, for example, aluminum trichloride, and a Lewis base, for example, N,N-dimethylformamide, and, optionally, a diluent, such as methylene chloride. The process is particularly advantageous for the preparation of substantially or all paralinked arylene ether ketone oligomers as the presence of the Lewis acid/Lewis base complex markedly reduces alkylation and ensures the substantial absence of ortho substitution. The monomer system can be, for example, a self-reacting monomer such as p-phenoxy-benzoyl chloride or a two-monomer system such as 1,4-diphenoxybenzene and terephthaloyl chloride.

Abstract: There is disclosed an improved prosthesis coated, respectively, with an anionic surfactant, a drug such as an antibiotic and/or antithrombotic agent. Optionally, the coated prosthesis may be treated with an ion exchange compound, to remove un-drug bound anionic surfactant. The drug is bound directly to the surfactant coated prosthesis.

Abstract: A colorless transparent polyimide shaped article having as a main component at least one recurring unit selected from the recurring units of the formulae (I) to (IX). It is useful, for example, as an oriented film in liquid crystal display devices. The polyimide shaped article is produced by a process which comprises preparing a solution of a polyamide acid having as a main component at least one recurring unit selected from the recurring units of the formulae (V) to (VIII) in an amide-type organic polar solvent, forming a shaped article of the polyamide acid from the solution, and imidizing the resulting shaped article of the polyamide acid.

Abstract: Partially soluble, film-forming polyimides and their copolymers made using 3,5-diaminobenzotrifluoride are described. Thin films and coatings of these materials are relatively colorless and the polymers have a high Tg, excellent thermal stability, lower moisture uptake, and lower dielectric constant. They are useful as films, fibers, molded articles and as protective coatings, interlevel dielectrics, electric circuit substrates and the like for the electronics industry.

Abstract: A method is provided for stabilizing a poly(arylene ether ketone), comprising the steps of:(a) digesting the poly(arylene ether ketone) in an aqueous medium to remove polymerization solvent, and(b) hydrothermally treating the poly(arylene ether ketone) by heating it to a temperature of at least 160.degree. C. while contacting it with water.

Abstract: A method and apparatus for rapidly dissolving particles of dry water soluble polymers or gums in water. A suspension of polymer particles is formed and subjected to conditions of high shear in a particle size reduction apparatus whereby the finely divided particles are forced into solution. Sufficient water is present that heat is dissipated and molecular degradation of the polymer is avoided.

Abstract: A method of preparing a film-forming polyphenylene oxide (PPO) composition as well as a laminate using such composition, wherein a setting means selected from the group consisting of a crosslinking monomer, a crosslinking polymer, and mixtures thereof, and, optionally, an initiator are added to and mixed with PPO, and a sufficient film-forming property is provided to PPO by allowing the setting means and, if present, the initiator to crosslink, whereby the PPO composition has the ability to form a film. Further, when a plurality of such films are stacked and integralized to form a melt-clad laminate, the laminate exhibits low dielectric constant and loss, so as to be used effectively in superhigh frequency bands such as the X band used for satellite communication.

Abstract: A colorless transparent polyimide shaped article having as a main component at least one recurring unit selected from the recurring units of the formulae (I) to (III), which is useful, for example, as an oriented film in liquid crystal display devices. The polyimide shaped article is produced by a process which comprises preparing a solution of (A) a polyimide precursor obtained by reacting a diamino compound comprising as a main component at least one aromatic diamine having amino groups at the m-position selected from diamines of formulae (IV) to (VI) with a tetracarboxylic acid compound comprising as a main component a tetracarboxylic acid dianhydride of formula (VII) dissolved in (B) at least one organic polar solvent selected from N,N-dimethylacetamide, N,N-dimethylformamide, bis(2-methoxyethyl)ether, cresol and halogenated phenols; forming a shaped article of the polyimide precursor from the solution; and imidizing the resulting shaped article.

Abstract: A method of stabilizing a poly(arylene ether ketone), which method comprises in one embodiment heating the poly(arylene ether ketone) at a temperature between about 240.degree. C. and about 325.degree. C. for a period of between about 0.5 and about 24 hours, prior to any melt-processing of the poly(arylene ether ketone) and in another embodiment hydrothermally treating the poly(arylene ether ketone) by heating it to a temperature of at least 160.degree. C. while contacting it with water.

Abstract: Described are polyamic acids, at least 50 mole-% of which are comprised of recurrent units corresponding to the general formula I: ##STR1## wherein, R.sup.1 is a mono-, di-, tri- or tetranuclear aromatic group andX is O, S, CO, SO.sub.2 or CR.sup.2 R.sup.3, each one ofR.sup.2 and R.sup.3 being H or CH.sub.3.A polyamic acid of the present invention, in the form of a solution, is applied to a substrate, for example, a semiconductor device, to form a protective layer thereon, and is converted into polyimide by heating. As against comparable compounds known in the art, the polyamic acids of the present invention are distinguished by a lower inherent viscosity at an unchanged molecular weight and, consequently, by an improved processability at an equally good thermal stability.

Abstract: Described herein are novel poly(aryl ether) polymers that contain naphthalene, terephenylene and/or anthracenylene units within their chains. Representative polymers are tough materials having excellent high temperature, oxidative and chemical resistance, and easy melt fabricability.

Abstract: Described herein are random poly(etherimide) containing ether-imide units and aryl ether and/or aryl ether ketone units. These copolymers are produced by the reaction of the appropriate activated dinitro- and/or dihalobenzenoid aromatic compounds with diphenols, and/or by the self condensation of halophenols and/or nitrophenols, whose halogen atom and nitro group are activated towards nucleophilic substitution reactions.

Abstract: Novel aromatic poly(ether ketones) having imide, amide, ester, azo, quinoxaline, benzimidazole, benzoxazole, or benzothiazole groups, comprising, for example, a repeat unit ##STR1## are prepared by Friedel Crafts polymerization.

Abstract: This invention relates to aryloxycycloalkanolaminoalkylene aryl ketones to the processes for their preparation and to their use as antihypertensive agents.

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.