Polychloroprene latices having improved "wet strength" are made by polymerising chloroprene in the presence of a water-soluble salt of a mercapto organic carboxylic acid.

An iron-containing composition suitable for parenteral administration in human and veterinary medicine consisting essentially of an aqueous solution of a complex of iron, said complex containing iron bound to a physiologically innocuous, water swellable polymer which is the reaction product of I. at least one hydroxy carboxylic acid selected from the group consisting of arabonic acid, gluconic acid and glucoheptonic acid and salts and lactones derivable therefrom; Ii. at least one polyhydric alc...

The present invention relates to polymers which have pH-depending solubility characteristics in aqueous solutions, whereby the polymers are copolymers between (a) methylmethacrylate (b) at least a monomer of the formula III ##STR1## wherein R.sup.3 is an alkyl group having 4 to 18 carbon atoms and R.sup.4 is hydrogen or methyl; and (c) a monomer of the formula I ##STR2## wherein R is hydrogen or methyl, n is an integer of from 1 to 4, and X is .dbd.CH.sub.2 or .dbd.O; and/or a monomer of the for...

A polymer of the formula (I): ##STR1## in which X.sub.1 means H or (R.sub.1).sub.1+1 --L.sub.1 CO--, X.sub.2 means --(L.sub.2).sub.m --OH or ##STR2## R.sub.1 means --COO.sup.- M.sup.+, --SO.sub.3.sup.- M.sup.+ or (M.sup.+).sub.2 PO.sub.3.sup.2-, L.sub.1 means alkylene, arylene, aralkylene or cycloalkylene, L.sub.2 means the residue of a polyether having an average molecular weight of 200 to 3000 (number average), M.sup.+ means a cation, l means a number from 0 to 4, m means a number 0 or 1 and n...

Polymer obtainable by a multistage polymerization process which involves conducting, in a first step, an aqueous-phase polymerization of at least one ethylenically monofunctional compound alone or together with at least one ethylenically difunctional or poly-functional compound together in the presence of a polyesterpolyol, polyurethane and/or polyacrylate; and, in a subsequent step, a reaction of the resulting product with at least one ethylenically monofunctional compound alone or together wit...

Polymer obtainable by a multistage polymerization process which involves conducting, in a first step, an aqueous-phase polymerization of at least one ethylenically monofunctional compound alone or together with at least one-ethylenically difunctional or poly-functional compound together in the presence of a polyesterpolyol, polyurethane and/or polyacrylate; followed by a reaction of the resulting product with a crosslinker; and its use.

Particles of polyethylene, polypropylene, polyacrylic lower alkyl esters, and polymethacrylic lower alkyl esters are pigmented by progressively mixing the dry particles with dry pigment in a high-speed mixer having a blade tip speed exceeding about 200 inches per second for a short period of a few minutes or less, whereby all of the pigment becomes firmly adhered to the surfaces of the polymer particles.

Stable dispersions of particles of synthetic polymer in inert organic liq in which the polymer is insoluble, the dispersion containing a stabilizer which is soluble in the organic liquid and which provides around the polymer particles a stabilizing steric barrier at least 12 A thick, the stabilizer being bonded to the polymer particles by strong specific interaction between polar groups in the stabilizer and complementary polar groups in the disperse polymer.

Apparatus for promoting polymerization reactions such as polyester wherein an inner edge of the rim of a wheel in the rotating element of the apparatus is left intact in a continuous circle, and projections of specific designs are attached wherein pumping action can be obtained without interfering with the ability of the wheel to film polymer melts up to about 100,000 poises viscosity.

Apparatus for finishing viscous materials, as in polycondensation reactions for the production of polyamides and polyesters wherein a low viscosity liquid is fed into one end of a cylindrical vessel having one or more vapor outlets and at least one horizontally mounted agitator, mounted for rotation within said vessel, and having a drive shaft running throughout the full length of said vessel having spoked wheels interspaced and interconnected by circularly arranged serrated blades, said wheels ...