Abstract:
Chain transfer agents for controlled radical polymerizations (RAFT) are described. The chain transfer agents have an azlactone or ring-opened azlactone moiety to provide telechelic (co)polymers.
Abstract:
Pressure sensitive adhesives are provided which possess high load bearing capabilities at elevated temperatures. The adhesives are prepared by polymerization of a syrup polymer composition having a first solute polymer having reactive, pendant functional groups, a second component having co-reactive functional groups, and a monomer mixture. The syrup polymer contains reactive electrophilic or nucleophilic functional groups that can subsequently crosslink by reaction with a second component having co-reactive functional groups.
Abstract:
Insoluble supports are prepared which possess high surface areas and efficiently dispersed isocyanate groups. These reactive supports are useful for covalently binding proteins which preferably are enzymes and provide catalysts for conducting organic reactions.
Abstract:
A composite article is provided having covalently reactive particles incorporated in a continuous, porous matrix. The reactive particles have surfaces of covalently reactive functional groups capable of directly forming covalent chemical bonds with ligands without need for an intermediate activation step. An adduct composite article is also provided comprising a continuous, porous matrix and derivatized particles dispersed therein. The derivatized particles comprise a direct, covalent reaction product of ligand with the covalently reactive particles. Methods of making and using the composite articles and adduct composite articles are also provided. Preferred covalently reactive functional groups are azlactone-functional groups of the formula: ##STR1## wherein: R.sup.1 and R.sup.2 independently can be an alkyl group having 1 to 14 carbon atoms, a cycloalkyl group having 3 to 14 carbon atoms, an aryl group having 5 to 12 ring atoms, an arenyl group having 6 to 26 carbon and 0 to 3 S, N, and nonperoxidic O heteroatoms, or R.sup.1 and R.sup.2 taken together with the carbon to which they are joined can form a carbocyclic ring containing 4 to 12 ring atoms, andn is an integer 0 or 1.
Abstract:
A method of decreasing the water uptake in a sulfopoly(ester-urethane) by preparing said sulfopoly(ester-urethane) from a chain extended sulfopolyester polyol which itself has been prepared in a two-step method, said sulfopoly(ester-urethane) comprising in its backbone at least one non-terminal arylene or alkylene group comprising a pendant sulfonic acid group or salt thereof, said sulfonic acid group or salt thereof having the formula ##STR1## wherein R is a trivalent aliphatic or aromatic group and M is a cation, said sulfonic acid group or salt thereof being bonded directly through said aliphatic or aromatic group to ester groups, the polymer of said sulfo(polyester-urethane) being terminated by at least one hydrolyzable silyl group,said two-step method for preparing said chain extended sulfopolyester polyol comprising the steps of:a) reacting a sulfopolycarboxylic acid or ester with a polyol to produce a sulfopolyester polyol,b) chain extending said sulfopolyester polyol by an esterification reaction with a lower aliphatic lactone to produce a chain extended sulfopolyester polyol, andsaid chain extended sulfopolyester polyol then, (1) in one embodiment, being reacted with a stoichiometric excess of a polyisocyanate and at least one of a polyol, polyamine, and polythiol to produce an isocyanate-terminated sulfo(polyester-urethane), which is then reacted with a nucleophilic, hydrolyzable silane or (2) in a second embodiment, being reacted with a polyisocyanate and a stoichiometric excess of at least one of a polyol, polyamine, and polythiol to produce a hydroxyl-, amino-, or mercapto-terminated sulfo(polyester-urethane) which is then reacted with an electrophilic hydrolyzable silane to produce said sulfopoly(ester-urethane), which when dried has decreased water uptake.
Abstract:
Insoluble supports are prepared which possess high surface areas and efficiently dispersed isocyanate groups. These reactive supports are useful for covalently binding proteins which preferably are enzymes and provide catalysts for conducting organic reactions.
Abstract:
The invention provides novel acrylamide functional disubstituted acetyl aryl ketones and a process for their preparation in high yields uncontaminated by difunctional material. The invention further provides photocrosslinkable compositions comprising one or more ethylenically-unsaturated monomers and as photoinitiator the acrylamide functional disubstituted acetyl aryl ketone of the invention. The compositions are useful for the preparation of films and coatings, particularly pressure-sensitive adhesive coatings.
Abstract:
Insolubilized enzyme particulates are located on the upstream surface of a filtration layer of a filtering element which can be used in a cartridge filter. Employed in a recycling flow reaction system at relatively high flux rates, the cartridges are useful for conducting catalyzed chemical reactions of dissolved solutes, for example, esterifications, isomerizations, oxidations, reductions, and cyclizations.
Abstract:
An azlactone-functional thermoplastic composition is disclosed. The composition is a blend of an azlactone-functional composition and a thermoplastic polymer. A method of making azlactone-functional homopolymers by bulk homopolymerization is disclosed, optionally also concurrent or sequential blending of a thermoplastic polymer. A method of blending azlactone-functional compositions and thermoplastic polymers is disclosed. Molded articles and adduct molded articles formed from the thermoplastic composition are disclosed.
Abstract:
Azlactone-functional polymer supports are useful reactive supports for the attachment of functional materials to provide novel adduct beads. The adduct beads are useful as complexing agents, catalysts, polymeric reagents, chromatographic supports, and as enzyme- or other biologically active supports. Novel carboxylate-functional polymer beads, are intermediates in the preparation of the azlactone-functional beads.Azlactone-functional supports have units of the formula: ##STR1## wherein R.sup.1 is H or CH.sub.3,R.sup.2 and R.sup.3 independently can be an alkyl group having 1 to 14 carbon atoms, a cycloalkyl group having 3 to 14 carbon atoms, an aryl group having 5 to 12 ring atoms, an arenyl group having 6 to 26 carbon and 0 to 3 S, N, and nonperoxidic O heteroatoms, or R.sup.2 and R.sup.3 taken together with the carbon to which they are joined can form a carbocyclic ring containing 4 to 12 ring atoms, andn is an integer 0 or 1, the azlactone functional supports having 0.1 to 99 molar parts of crosslinking monomer incorporated therein.