Abstract: A process for the production of polyphenylene ethers with reduced inherent color by the addition of a boron compound after the termination of the oxidative coupling reaction and removal of the metallic catalyst residues.

Abstract: A solid, aqueous paint is contained in a lidded container comprising a tray adapted to receive a roller applicator. The paint comprises as essential ingredients a latex polymer dispersion, a thickener and a structuring agent selected from natural or synthetic clays, zirconium or titanium chelates, or a mixture of these agents. The solid paint is characterised by its achieving, after manufacture, specified criteria such as gel strength and viscosity within specified times and which are appropriate to its circumstances of containment and to its application properties from a roller applicator.

Abstract: Highly heat-resistant polyaryl ether ketones are composed of(A) from 50 to 100 mol % of repeat units of the general formula I ##STR1## or a ring-substituted C.sub.1 -C.sub.8 -alkyl, C.sub.1 -C.sub.8 -alkoxy, aryl, chlorine or fluorine derivative thereof and(B) from 0 to 50 mol % of repeat units, different from I, of the general formulae II and/or III ##STR2## or a ring-substituted C.sub.1 -C.sub.8 -alkyl, C.sub.1 -C.sub.8 -alkoxy, aryl, chlorine or fluorine derivative thereof, where Q, Q', Y, Y', T, T', Z and Z' are each --O--, --CO-- or a chemical bond, one or more of these substituents is a --CO-- group, and s, t and u are each 0 or 1.

Abstract: A polyester copolymer comprise 20 to 80 percent by mole of hydroxy-benzoic acid units, 1 to 40 percent by mole of naphthalene units and 1 to 40 percent by mole of dihydroxy-diphenylketone units. It is improved in the heat resistance and is specified by exhibiting the anisotropy in the molten state.

Abstract: This invention relates to a process for removing a solute from a solution. The process comprises maintaining the solution at reflux conditions to produce a vapor which evolves from the reaction solution. At least a portion of the vapor is removed from the zone and is contacted, outside of the reaction zone, with a solid removal agent which is specific for capturing to itself that portion of the vapor which was the solute to be removed and originally present in the reaction solution. After such capture, the remaining vapor is condensed and returned to the reaction zone. In another embodiment, the solute is removed from the solution by first maintaining the solution at reflux conditions in a zone to produce a vapor which evolves from the solution. At least a portion of that vapor is removed from the zone and condensed. The resultant condensate is contacted, outside of the reaction zone, with a solid removal agent which is specific for capturing unto itself the solute from the condensate.

Abstract: The present invention provides diamino compounds and liquid crystal aligning films comprising polyimides which are obtained from the said diamino compounds represented by the general formula: ##STR1## wherein R.sub.1 indicates an alkyl group having 3 to 22 carbon atoms, R.sub.2 indicates a hydrogen atom or an alkyl group having 1 to 22 carbon atoms, and R.sub.3 -R.sub.10 indicate a hydrogen atom or a methyl group, respectively.The liquid crystal aligning films are useful for STN mode display cells in realizing a high pretilt angle.

Abstract: A protective coating for solar cells, particularly solar cells positioned in space and which coating is a polyimide which is colorless, transparent, relatively non-brittle, has a high degree of thermal stability and readily transmits solar radiation without appreciable degradation. The coating is heat resistant and does not degrade significantly when exposed to ultraviolet radiation, and is highly effective in repelling low energy proton particles.

Abstract: Described herein are amorphous thermoplastic terpolymers containing units of the formula: ##STR1## wherein R is independently hydrogen, C.sub.1 to C.sub.6 alkyl, or C.sub.4 to C.sub.8 cycloalkyl, X' is independently ##STR2## wherein R.sub.1 and R.sub.2 are independently hydrogen or C.sub.1 to C.sub.9 alkyl; ##STR3## wherein R.sub.3 and R.sub.4 are independently hydrogen or C.sub.1 to C.sub.8 alkyl and a.sub.1 is an integer of 2 to 7; --S--, --O--, or ##STR4## a is an integer of 0 to 4 and n is independently an integer of 1 to 3. The units are attached to each other by an --0-- bond. These polymers have an excellent combination of mechanical properties. They display high notched izod impact values, high heat distortion temperatures and excellent environmental stress crack resistance.

Abstract: Novel copoly(arylene ether ketones) having a biphenylene-4,4'-dicarbonyl group in their backbone, comprising(A) a repeat unit ##STR1## and (B) a repeat unit selected from the group consisting of ##STR2## where R, which is the same in each of repeat units (A) and (B), is a direct bond, ##STR3## the molar ratio of repeat units (A) to repeat units (B) being between about 10:90 and about 70:30.

Abstract: Described herein is a method for preventing molecular weight degradation in the preparation of poly(aryl ether sulfones) by nucleophilic displacement polycondensation reactions. This method comprises the addition of an effective amount of a sodium, lithium, alkaline earth or lanthanide metal salt to the polycondensation reaction to control the molecular weight of the poly(aryl ether sulfone).

Abstract: A storage stable polyester polyol mixture is prepared by(a) digesting polyethylene terephthalate with a digesting medium comprising a polycarboxylic acid component-containing polyol derived from a digesting polycarboxylic acid component and a digesting polyol component to form a digested polyol mixture and liberate ethylene glycol from said polyethylene terephthalate, and(b) distilling from said digested polyol mixture the amount of liberated ethylene glycol sufficient for improved storage stability of the mixture.The polyester polyol mixture is useful in the preparation of cellular foam materials, particularly polyisocyanurate and polyurethane foams.

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: Highly soluble, optically transparent aromatic polyimides of the following formula are disclosed: ##STR1## where --X and --X.sub.1 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms,--X is different than --X.sub.1,--Y is independently --H, or --Z,--Z is independently --Cl, --Br or --I,r=0-100% of r+t, ands=100%t=100% -r of r+t are disclosed.

Abstract: The solvent resistance of polyethersulfone oligomers is enhanced by using difunctional imidophenol end-cap monomers to provide improved crosslinking. The imidophenol monomers include two unsaturated functionalities capable of cross-linking upon thermal or chemical activation. Blends, pregregs, and compositions using the novel end caps are described for linear or multidimensional polyethersulfone oligomers.

Abstract: A composition for the application of a planar polyimide coating having a glass transition temperature above 300.degree. C. comprises a solution in an anhydrous, aprotic solvent of an aromatic diamine and a dialkyldihydrogen pyromellitate which is more than 90% meta isomer.

Abstract: Described herein are novel poly(aryl ethers) based on 2,5-di-t-butylhydroquinone. These poly(aryl ethers) have excellent high temperature, oxidative and chemical resistance, as well as good melt-fabricability.

Abstract: There are disclosed a process for producing a polyamide acid having at least one siloxane bond, which comprises carrying out the reaction of:(a) a tetracarboxylic dianhydride having at least one siloxane bond of the formula: ##STR1## wherein R represents a monovalent hydrocarbon group and m is an integer of 1 or more;(b) a diamine; and(c) a diaminoamide compound of the formula (II): ##STR2## wherein Ar represents an aromatic residue, Y represents SO.sub.2 or CO, and one amino group and Y--YNH.sub.

Abstract: Rapid process for the formation of heterocyclic aromatic polymers by contacting one or more appropriate multifunctional aromatic compounds, such as a diaminobenzenediol, a terephthaloyl halide and/or an aminohydroxybenzoic acid, with a sulfonic acid and a dehydrating agent.

Abstract: Polyamide-imides of low thermal expansivity having a repeating structural unit of the general formula (I) ##STR1## in which Ar is a tetravalent aromatic group, A is --NHCO--, R1 through R3 are alkyl, alkoxy, or halogen, l, m, and n are integers from 0 to 4, x is 0 or 1, and y is an integer indicating the number of repeating units and in which at least one alkoxy group is present, show improved mechanical (for example, flexibility) and adhesive properties and low water absorption and are useful for the manufacture of flexible base materials for printed circuit boards, etc.

Abstract: A condensation polyimide containing a 1,1,1-triaryl-2,2,2-trifluoroethane structure, other related condensation polyimides and process for their preparation, which comprises polymerization of a cyclic dianhydride with a diamine.