摘要:
This invention is directed to dispersions containing stabilizing amounts of certain substantially linear interpolymeric interfacially spreading polyelectrolytes composed of a mixture of nonionic hydrophobic units and ionic hydrophilic units where the nonionic units are randomly distributed in the backbone of the polyelectrolyte and where the polyelectrolyte is adsorbed at the surface of the disperse phase of the dispersion in a substantially flat configuration. The polyelectrolytes are further characterized by having an adsorption constant equal to or greater than 1 at the point where the surface of the disperse phase is saturated with the polyelectrolyte, the absorption constant being determined as the amount of polyelectrolyte in the disperse phase divided by the amount of polyelectrolyte in the continuous phase. These stabilized dispersions are particularly useful as coating compositions and for use in the preparation of microspheres and seed latexes.
摘要:
A method for electrodeposition of an organic material on an electroconductive surface comprising placing the electroconductive surface to be coated in contact with an aqueous dispersion containing a water-insoluble, essentially electrically nonconductive, film-forming, organic polymer as cation-active particles wherein the cation-activity is provided at least predominantly by reducible nitrogen-containing cations and passing an electric current from an electrode through the latex to the electroconductive surface in such a direction that the electroconductive surface is negatively charged, i.e., becomes a cathode in an electrophoretic cell. By use of alternating current, both electrodes become coated with an adherent coating of polymer.
摘要:
Novel isothiouronium salts are herein described which correspond to the formula ##STR1## wherein R and R' are each independently hydrocarbyl or inertly-substituted hydrocarbyl of at least 4 carbon atoms; R.sub.1 -R.sub.4 are each independently alkyl or hydroxyalkyl of 1 to 4 carbon atoms, or R.sub.1 and R.sub.3 are joined to form a 5- or 6-membered heterocyclic ring; n is 0 or 1; and A.sup..crclbar. is an inert neutralizing anion. The isothiouronium salts are surprisingly effective dispersing agents and are used in forming electrodepositable latexes.
摘要:
Structured-particle latexes are prepared from nonionic or slightly cationic latexes, either preformed or polymerized in situ, by emulsion polymerizing monomeric materials which include an ethylenically unsaturated, activated-halogen monomer such as vinylbenzyl chloride in the absence of a sufficient amount of a surfactant to initiate new particles whereby the activated-halogen monomer is copolymerized on the surface of the existing particles which are dispersed in an aqueous media. The resulting structured-particle latex may then be reacted with a nucleophile such as dimethyl sulfide or trimethyl amine to form a latex having stabilizing "onium" groups such as sulfonium groups or quaternary ammonium groups chemically bound at or near the surface of the polymer particles which are dispersed in aqueous media. The cationic latexes are suitable for coatings and organic pigments.
摘要:
A method for electrodeposition of an adherent, water-resistant, cross-linked, organic coating on an electroconductive surface comprising (a) placing the elecroconductive surface to be coated in contact with an aqueous dispersion containing a water-insoluble, essentially electrically non-conductive, film-forming, organic polymer as cation-active, structured particles wherein a substantial portion of the cation-activity is provided by pH independent cationic groups which are chemically bound to the polymer at or near the particle surface and (b) passing an electric current from an electrode through the latex to the electroconductive surface in such a direction that the electroconductive surface is negatively charged, i.e., becomes a cathode in an electrophoretic cell. By use of alternating current both electrodes become coated with an adherent coating of polymer.
摘要:
An aqueous dispersion containing a water-insoluble, essentially electrically non-conductive, organic polymer as cation-active particles wherein a substantial portion of the cation-activity is provided by isothiouronium cations may be obtained by various methods including emulsion polymerization of hydrophobic monomers using an isothiouronium surfactant or by emulsion copolymerization of a monomer containing isothiouronium groups with hydrophobic monomers.
摘要:
Structured-particle latexes are prepared from nonionic or slightly cationic latexes, either preformed or polymerized in situ, by emulsion polymerizing monomeric materials which include an ethylenically unsaturated, activated-halogen monomer such as vinylbenzyl chloride in the absence of a sufficient amount of a surfactant to initiate new particles whereby the activated-halogen monomer is copolymerized on the surface of the existing particles which are dispersed in aqueous media. To the resulting structured particle latex may then be added conventional cationic surfactants to provide greater stability. The cationic latexes are suitable for coatings.
摘要:
A method for electrodeposition of an organic material on an electroconductive surface comprising placing the electroconductive surface to be coated in contact with an aqueous dispersion containing a water-insoluble, essentially electrically non-conductive, film-forming, organic polymer as cation-active particles wherein the cation-activity is provided at least predominantly by sulfonium cations and passing an electric current from an electrode through the latex to the electroconductive surface in such a direction that the electroconductive surface is negatively charged, i.e., becomes a cathode in an electrophoretic cell. By use of alternating current both electrodes become coated with the polymer.
摘要:
A method for electrodeposition of an organic material on an electroconductive surface comprising placing the electroconductive surface to be coated in contact with an aqueous dispersion containing a water-insoluble, essentially electrically non-conductive, film-forming, organic polymer as cation-active particles wherein a substantial portion of the cation-activity is provided by sulfoxonium cations and passing an electric current from an electrode through the latex to the electroconductive surface in such a direction that the electroconductive surface is negatively charged, i.e., becomes a cathode in an electrophoretic cell. By use of alternating current both electrodes become coated with an adherent coating of polymer.
摘要:
Novel optical devices, methods and systems relating to the detection of glucose, and more particularly to real-time glucose monitoring, are disclosed herein. More particularly, various hardware and methodological means are disclosed for ratiometric correction of optical glucose measurements for artifacts of optical systems.