Abstract: In some aspects, the present disclosure pertains to multi-arm polymers that comprise a core and a plurality of polymer segments having a first end that is covalently attached to the core and (a) a second end comprising a moiety that comprises a reactive end group, wherein the polymer segments comprise one or more hydrophilic aprotic NMP-polymerizable monomers, and wherein the reactive multi-arm polymer comprises nitroxide radicals or (b) a second end comprising a moiety that comprises an alkoxyamine group, wherein the core is a polyol residue, and wherein the polymer segments comprise one or more NMP-polymerizable monomers. In some aspects, the present disclosure pertains to a multifunctional alkoxyamine molecule comprising a core and a plurality of alkoxyamine groups covalently attached to the core, wherein the core is a polyol residue.

Abstract: In some aspects, the present disclosure pertains to a multi-arm polymer comprising a core and a plurality of polyoxazoline segments (or arms) having a first end that is covalently attached to the core and a second end comprising a moiety that comprises a reactive group. In some aspects, systems are provided that comprise a first composition comprising such a multi-arm polymer and a second composition comprising a multifunctional compound that comprises functional groups that are reactive with the reactive groups of the multi-arm polymer. In some aspects, systems are provided that comprise crosslinked reaction products of such a multi-arm polymer and such a multifunctional compound.

Abstract: In some aspects, the present disclosure pertains to multi-arm polymers that comprise a core and a plurality of polymer segments having a first end that is covalently attached to the core and (a) a second end comprising a moiety that comprises a reactive end group, wherein the polymer segments comprise one or more hydrophilic aprotic NMP-polymerizable monomers, and wherein the reactive multi-arm polymer comprises nitroxide radicals or (b) a second end comprising a moiety that comprises an alkoxyamine group, wherein the core is a polyol residue, and wherein the polymer segments comprise one or more NMP-polymerizable monomers. In some aspects, the present disclosure pertains to a multifunctional alkoxyamine molecule comprising a core and a plurality of alkoxyamine groups covalently attached to the core, wherein the core is a polyol residue.

Abstract: In some aspects, the present disclosure pertains to a multi-arm polymer comprising a core and a plurality of polyoxazoline segments (or arms) having a first end that is covalently attached to the core and a second end comprising a moiety that comprises a reactive group. In some aspects, systems are provided that comprise a first composition comprising such a multi-arm polymer and a second composition comprising a multifunctional compound that comprises functional groups that are reactive with the reactive groups of the multi-arm polymer. In some aspects, systems are provided that comprise crosslinked reaction products of such a multi-arm polymer and such a multifunctional compound.

Abstract: Methods of treating a substrate, e.g., forming a coating on the substrate, are described. The method may include applying a solution comprising a multifunctional molecule or a multifunctional-polymer molecule to at least a portion of a surface of the substrate. The surface may comprise a metal or metal alloy and the multifunctional molecule or a multifunctional-polymer molecule may bond to the surface via at least one sulfur group of a plurality of sulfur groups of the multifunctional molecule. The method may include combining the multifunctional molecule with a polymer molecule to form the multifunctional polymer molecule before or after applying the solution. The polymer molecule may bond to an internal carbon group or a terminal sulfur group of the multifunctional molecule.

Abstract: In some aspects, the present disclosure pertains to a multi-arm polymer comprising a core and a plurality of polyoxazoline segments (or arms) having a first end that is covalently attached to the core and a second end comprising a moiety that comprises a reactive group. In some aspects, systems are provided that comprise a first composition comprising such a multi-arm polymer and a second composition comprising a multifunctional compound that comprises functional groups that are reactive with the reactive groups of the multi-arm polymer. In some aspects, systems are provided that comprise crosslinked reaction products of such a multi-arm polymer and such a multifunctional compound.

Abstract: In some aspects, the present disclosure pertains to multi-arm polymers that comprise a core and a plurality of polymer segments having a first end that is covalently attached to the core and (a) a second end comprising a moiety that comprises a reactive end group, wherein the polymer segments comprise one or more hydrophilic aprotic NMP-polymerizable monomers, and wherein the reactive multi-arm polymer comprises nitroxide radicals or (b) a second end comprising a moiety that comprises an alkoxyamine group, wherein the core is a polyol residue, and wherein the polymer segments comprise one or more NMP-polymerizable monomers. In some aspects, the present disclosure pertains to a multifunctional alkoxyamine molecule comprising a core and a plurality of alkoxyamine groups covalently attached to the core, wherein the core is a polyol residue.

Abstract: A medical device for insertion or implantation in a body includes a polymer substrate and a layer of poly(vinyl pyrrolidone-alt-maleic anhydride) formed on a surface of the polymer substrate. Polymer chains of the poly(vinyl pyrrolidone-alt-maleic anhydride) are entangled with the polymer substrate.

Abstract: A medical device for insertion or implantation in a body includes a polymer substrate and a layer of poly(vinyl pyrrolidone-alt-maleic anhydride) formed on a surface of the polymer substrate. Polymer chains of the poly(vinyl pyrrolidone-alt-maleic anhydride) are entangled with the polymer substrate.

Abstract: A biocompatible polyisobutylene urethane, urea, and urethane/urea copolymer including hard segments, soft segments and that is free of urethane, urea or urethane/urea solvents. The hard include diisocyanate residue. The soft segments include at least one polyisobutylene diol or diamine and optionally a polyether diol.

Abstract: A process for preparing isocyanate adducts having a high proportion of monoisocyanurate using a quaternary ammonium carboxylate trimerization catalyst. Also claimed are specific carboxylate catalysts, together with a process for producing the catalysts. The catalysts are particularly useful for trimerizing hexamethylene diisocyanate and isophorone diisocyanate.

Abstract: An electrostatic method is disclosed for providing multicolor imaging from a single toner bath. The toner bath is a blend of individual toners, each of which contains a color precursor different from the others. Also disclosed is a method for the double encapsulation of toner particles to produce toner particles characterized by multiple encapsulation.

Abstract: An electrostatic multicolor imaging system employs a transfer surface which is charged imagewise such that blended microcapsular chromogenic photohardenable toner particles are electrostatically deposited only in those charged regions of a latent image formed on the surface where colors are to be provided for the image.

Abstract: Described herein are photopolymerizable compositions comprising at least one polymerizable ethylenically unsaturated compound, and an initiating combination of an organic soluble xanthene dye compound and an organic activator compound. These compositions are useful as radiation-curable coatings, photocurable films, and photoactive films.

Abstract: An electrostatic method is disclosed for providing multicolor imaging from a single toner bath. The toner bath is a blend of individual toners, each of which contains a color precursor different from the others. Also disclosed is a method for the double encapsulation of toner particles to produce toner particles characterized by multiple encapsulation.

Abstract: Compounds of the formula: ##STR1## where Q is a polymerizable olefin substituent;Ar is an aromatic moiety;C.sup..alpha. is the .alpha. carbon;R.sup.1 and R.sup.2 are independently hydrogen or aliphatic groups; andZ is a halogen, oxygen-containing, nitrogen-containing or sulfur-containing substituent complying with one of the formulae: --X, --OR, --SR or --NR.sub.2, wherein X is a halogen and each R is independently a hydrogen atom or an aliphatic moiety;contain azo groups which are stable with respect to thermal decompositon at high temperatures (180.degree. C. to 240.degree. C. and beyond) in the absence of moderate light, so that such compounds may be polymerized and processed at ordinary polystyrene process temperatures. However, the azo group in those compounds or in polymers made from them decomposes to initiate free radical polymerization at temperatures of 100.degree. C. to 120.degree. C. or less in the presence of moderate light.

Abstract: A positive or negative latent image can be developed with negatively or positively charged toner particles, respectively, that are microcapsular. The shell material of the toner particles is a melamine-formaldehyde resin or a starch-based material. The core is a liquid solution comprising at least a liquid, ethylenically unsaturated monomer, a leuco dye and a photoinitiator.

Abstract: Compounds of the formula: ##STR1## wherein Q is a polymerizable olefin substituent;Ar is an aromatic moiety;C.sup..alpha. is the .alpha. carbon;R.sup.1 and R.sup.2 are independently hydrogen or aliphatic groups; andZ is a halogen, oxygen-containing, nitrogen-containing or sulfur-containing substituent complying with one of the formulae: --X, --OR, --SR or --NR.sub.2, wherein X is a halogen and each R is independently a hydrogen atom or an aliphatic moiety;contain azo groups which are stable with respect to thermal decomposition at high temperature (180.degree. to 240.degree. C. and beyond) in the absence of moderate light, so that such compounds may be polymerized and processed at ordinary polystyrene process temperatures. However, the azo group in those compounds or in polymers made from them decomposes to initiate free radical polymerization at temperature of 100.degree. C. to 120.degree. C. or less in the presence of moderate light.

Abstract: This, invention relates to electrostatic imaging systems, and, more particularly, color-self-developing toner particles and processes for the fabrication and use thereof. A blend of these toner particles is useful in multicolor electrostatic imaging using a single dry or liquid toner bath. Potential applications include full-color xerographic copying, full-color printing, full-color computer-generated imaging, and the like.