Abstract: This invention provides a new, biomass-derived glycol, bis(2-hydroxyethyl)isosorbide, which is found to be a valuable monomer for a wide variety of polymeric materials

Abstract: This invention provides a new, biomass-derived glycol, bis(2-hydroxyethyl)isosorbide, which is found to be a valuable monomer for a wide variety of polymeric materials.

Abstract: A bullet includes a frontward facing aperture. Contained within the aperture is a relatively hard bullet frontal element that provides advantageous bullet impact performance. In one embodiment, the frontal element is a steel sphere that provides advantageous penetration and weight retention when the bullet impacts laminated glass, such as an automobile windshield.

Abstract: A copolyester of the reaction product of: (a) one or more aromatic dicarboxylic acids or an ester thereof, (b) one or more aliphatic dicarboxylic acids or an ester thereof, and (c) isosorbide. The polyesters are useful to form articles of increased biodegradability.

Abstract: A rotary kiln in which reaction is to occur between counterflowing reactants and an injector for a reactant extends into a reaction zone in the kiln. The injector is provided with means for adjusting the temperature of the injected reactant to a temperature in the desired range for that zone. Further means are provided for maintaining a temperature in the desired range throughout the zone. The arrangement be used in the production of uranium oxides from uranium hexafluoride.

Abstract: Compositions based on blends of certain specified poly(vinyl alcohol) copolymers and other poly(vinyl alcohol) polymers are described which are useful as sizes, and have improved ability to be desized from fabrics compared with the other poly(vinyl alcohol) polymers alone. The specific poly(vinyl alcohol) copolymers useful in the blends with other poly(vinyl alcohol) polymers are copolymers having a high level of acrylic ester comonomer. The blend sizes are useful in producing woven materials since they are excellent sizes, and are uniquely adaptable to caustic desizing.

Abstract: Compositions based on blends of certain specified poly(vinyl alcohol) copolymers and other poly(vinyl alcohol) polymers are described which are useful as sizes, and have improved ability to be desized from fabrics compared with the other poly(vinyl alcohol) polymers alone. The specific poly(vinyl alcohol) copolymers useful in the blends with other poly(vinyl alcohol) polymers are copolymers having a high level of acrylic ester comonomer. The blend sizes are useful in producing woven materials since they are excellent sizes, and are uniquely adaptable to caustic desizing.

Abstract: Metallic, ash-producing residues which remain in poly(vinyl alcohol) polymer after its preparation from poly(vinyl acetate) are removed by a process which involves contacting a slurry of the poly(vinyl alcohol) polymer, after preparation and before polymer isolation, with ion-exchange resin particles, followed by removal of the ion-exchange resin particles from the poly(vinyl alcohol) polymer particles utilizing size or weight differences between them. The poly(vinyl alcohol) polymer remains in the solid state throughout, avoiding dissolution and the need for re-precipitation.

Abstract: Compositions based on blends of certain specified poly(vinyl alcohol) copolymers and various starches are described which are useful as sizes, and can have improved ability to be desized from fabrics compared with the starches alone. The specific poly(vinyl alcohol) copolymers useful in the blends with the starches are copolymers having a high level of acrylic ester comonomer. The blend sizes are useful in producing woven materials since they are excellent sizes, and are uniquely adaptable to caustic desizing.

Abstract: An improved process for producing woven textiles, comprising:a) sizing yam to be woven, with an aqueous solution of a poly(vinyl alcohol) copolymer containing from about 7 to 15 weight percent units derived frown a comonomer selected from the group consisting of an alkyl acrylate, an alkyl methacrylate, a dialkyl fmnarate and a dialkyl maleate, wherein the alkyl group contains from 1 to 8 carbon atoms;b) weaving the yam to produce woven textile;c) desizing the resulting woven textile with an aqueous caustic solution having a concentration between 0.001 and 10 weight percent caustic material in water, andd) optionally washing the caustic desized woven textile with water.The sizes are very readily desizable, even when the woven textile fabrics have been heat treated.

Abstract: A polyimide, and a gas separation membrane prepared therefrom, containing repeating units derived from 5(2,5-dioxo-tetrahydrofuryl)-3-methyl-3,3-cyclohexane-1,2-dicarboxylic anhydride is disclosed.

Abstract: Metallic, ash-producing residues which remain in poly(vinyl alcohol) polymer after its preparation by hydrolysis of poly(vinyl acetate) are removed by a process which involves contacting a slurry of the poly(vinyl alcohol) polymer with ion-exchange resin particles, followed by removal of the ion-exchange resin particles from the poly(vinyl alcohol) polymer particles utilizing size or weight differences between them. The poly(vinyl alcohol) polymer remains in the solid state throughout, avoiding dissolution and the need for reprecipitation.

Abstract: Incorporation of at least one hindered amine light stabilizer ("HALS") compound having a hindered phenol group and a piperidine ring or oxo-piperazinyl ring, provided that each such ring has a hindered amine, at the N.sup.4 position in the ring, that is of tertiary functionality, into polyacetal homopolymer compositions improves the UV stability, and does not significantly degrade the melt processing thermal stability, of said composition.Incorporation of (a) a HALS compound having an s-triazine group, along with a piperidine ring or an oxo-piperazinyl ring, (provided each such ring has a hindered amine at the N.sup.4 position in the ring), and (b) a HALS as described in the preceding paragraph into polyacetal polymer compositions improves the UV stability, and does not significantly degrade the thermal stability of said composition.The composition of the present invention are useful in polyacetal applications where enhanced UV stability is desired.

Abstract: Novel aromatic polyimide gas separation membranes and the process of using such membranes to separate one or more gases from a gaseous mixture is disclosed.

Abstract: This invention relates to polyacetal compositions that are stabilized against ultraviolet light and heat degradation due to the inclusion therein of a mixed hindered amine light stabilizer (HALS) system, wherein each HALS of the system contains a hindered amine that is of tertiary functionality.

Abstract: A process is disclosed for sealing gas separation membranes through treatment with two monomeric materials which condense with each other to form a polymer such as a diamine and a di- or tri- acyl chloride.

Abstract: A process for preparing multicomponent gas separation membranes is disclosed. The process involves casting two or more solutions of polymer, and partially removing solvent from the side of the cast polymer that is to form the gas separation layer of the membrane. The membrane is then quenched to freeze its structure and then the remainder of the solvent removed to form the gas separation membrane.

Abstract: Polyaramide gas separation membranes and the process of using them are disclosed.

Abstract: Incorporation into polyacetal molding compositions stabilized for processing with a non-meltable polymer stabilizer of 0.01-1.00 weight percent of at least one meltable co-stabilizer, said co-stabilizer being a thermal stabilizer for polyacetal, and 0.02-1.0 weight percent of at least one primary antioxidant results in significantly improved long term stability, as evidenced by greater retention of physical properties over time, of such compositions.

Abstract: A process for improving the permselectivity of an aromatic polyimide gas separation membrane comprising contacting the membrane with a solution of a surfactant in a solvent which swells the membrane but in which the membrane material is soluble to an extent of no more than 3% under the conditions used to contact the membrane.