79results about "Polyacetal coatings" patented technology

This invention relates to iodonium salts, acetal copolymers and polymer binders comprising functional groups capable of undergoing cationic or radical polymerization, their method of preparation and their use in the preparation of coating solutions and coatings. This invention also relates to coatings containing the iodonium salts, acetal copolymers and / or polymer binders and to negative working lithographic printing plates comprising these coatings.

A phenol-formaldehyde novolac resin having a low concentration of free phenol prepared by distilling residual phenol from a molten novolac resin and replacing at least a portion of the phenol with a solvent having a volatility equal to or less than phenol. Such modified novolac resins are suitable for the production of resin coated molding sands for shell molding and sand cores, as well as for the production of resin coated proppants for use in oil and gas recovery operations.

It is an object of the invention to provide a polyvinyl acetal resin for lacquer and ink, which can suppress the occurrence of coloring and a foul odor of the polyvinyl acetal resin itself even when no antioxidant is used at all therein, and a lacquer and ink composition which has excellent color and the high stability of viscosity in storing it for long periods. The invention provides a polyvinyl acetal resin for lacquer and ink synthesized by acetalization reaction of polyvinyl alcohol and an aldehyde, wherein a polymerization degree is 100 to 3,000, a proportion of a residual acetyl group is 25 mol % or less and a proportion of a residual hydroxyl group is 17 to 35 mol %; a content of the residual aldehyde is 100 ppm or less, a content of residual butyric acid is 100 ppm or less, a content of residual 2-ethyl-2-hexenal is 100 ppm, and a content of a residual acid catalyst is 300 ppm or less, and no antioxidant is remained at all therein.

A phosphorus-acid-group-containing (meth)acrylamide polymer having high electrolytic group density and excellent conductivity is obtained by introducing a phosphorus acid group into a (meth)acrylamide monomer which may be N-substituted, and polymerizing the resultant monomer. This polymer is usable for conductive resins, proton-conductive polymer electrolyte membranes and coating agents.

Disclosed herein is a composition for forming an organic insulating film and an organic insulating film formed from the composition. An exemplary composition comprises an insulating polymer having a maleimide structure, a crosslinking agent and a photoacid generator so as to form a crosslinked structure. The organic insulating film has excellent chemical resistance to organic solvents used in a subsequent photolithographic process and can improve the electrical properties of transistors.

The invention discloses a lower limb rehabilitation device. The device comprises a square case body, the right side of the square case body is provided with a square box body, the upper end surface and the right surface of the square box body are hollow surfaces, a heightening block is welded on the left upper side of the square box body, an electric cylinder is welded on the upper side of the heightening block, a first connecting rod is welded on a piston rod of the electric cylinder, both the front side wall and the rear side wall of the square box body are hinged to connecting plates, the front and back connecting plates are directly and fixedly connected to a foot fixing plate, and the left side of the foot fixing plate is welded with a second connecting rod. The device is provided with the electric cylinder, and the foot fixing plate used for fixing feet can be pulled through the pulling of the electric cylinder, so that a patient can passively receive rehabilitation treatment ina time-saving and labor-saving manner. Meanwhile, the patient can actively step on the foot fixing plate to carry out free rehabilitation treatment. The device can provide a passive and active rehabilitation treatment schemes according to the requirements of patients, and the foot fixing plate is coated with a wear-resistant layer so as to reduce the abrasion, and to prolong the service life.