Abstract: This invention relates to an improved process for continuously producing catalyzed melt polymerization polymers and apparatus for intimately mixing the components during the process. In particular, this invention relates to the continuous catalytic polymerization of poly(hydroxy acids) using a counter-current impeller mixing system.

Abstract: A hood suitable for protection against decompression and toxic fumes having a flanged neck seal.

Abstract: A pigmented ink for ink jet printers which comprises an aqueous carrier medium, pigment particles dispersed in an AB or BAB block copolymer having a hydrophilic segment and a segment that links to the pigment, and an effective amount of a surfactant sufficient to decrease the drying time of the ink. The A block and the B block(s) have molecular weights of at least 300. These inks give images having good print quality, water and smear resistance, lightfastness, and storage stability.

Abstract: A hood for providing a user with breathable air having CO.sub.2 absorption means disposed therein, in which the absorption means is intimately admixed with a fibrous material.

Abstract: A CO.sub.2 absorption means in which absorbant is intimately admixed with a fibrous material and formed into a sheet.

Abstract: A process for the recovery of silver from exposed or unexposed photographic film using a caustic alkali solution at elevated temperatures with high shear.

Abstract: Particulate polymethyl methacrylate polymerized in the presence of alumina trihydrate filler provides a superior blasting media for cleaning surfaces, such as for stripping paint from sensitive substrates like aluminum aircraft skin.

Abstract: Tubing of a thermoplastic polymer for handling corrosive materials is laminated or reinforced by covering the same with a heat-softenable bonding agent as an adhesive, inserting the adhesive-covered tube in a cylindrical glass fabric sleeve, inserting the assembly in a hollow cylinder, heating the tube to a temperature to cause the softening of the bonding agent and adhesion to the tube, forcing the tube with air or centrifugal force against the inside of the cylinder to force softened bonding agent into the interstices of the glass fabric, and cooling the entire assembly while expanded to adhere the bonding agent to the fabric and thereby form a unitary structure. The reinforced tube can be bonded to the inside of a preformed steel or fiberglass-reinforced plastic pipe to serve as a protective liner therefor.