摘要:
Process for preparing stable polymer concentrates, wherein acryloyldimethyltaurine and/or acryloyldimethyltaurate are free-radically polymerized with at least one further component in the presence of a polymerization medium, a higher-boiling solvent or solvent mixture is added to the resulting reaction product or reaction mixture, and the lower-boiling polymerization medium is removed, optionally under reduced pressure.
摘要:
An ophthalmic lens made from a crosslinkable polymer containing H-active groups bonded to the oligomer or polymer backbone, some or all of whose hydrogen atoms have been substituted by radicals of a N-hydroxyalkyl (meth)acrylamide. The lens transmits at least 70% of visible light.
摘要:
A process for the preparation of concentrates which comprise 5 to 80% by weight of a copolymer based on acryloyldimethyltauric acid or salts thereof, 20 to 95% by weight of one or more emulsifiers and/or a solvent or solvent mixture and 0 to 30% by weight of water is described. The concentrates can, for example, be used for the preparation of cosmetic, pharmaceutical and dermatological preparations.
摘要:
The present invention relates to a process for the preparation of thermoprecipitating affinity polymers useful in the enhanced recovery of enzymes. The process comprises polymerising a monomer comprising a spacer and a co-monomer with a polymerisation initiator and a polymerisation accelerator at ambient temperature and pressure for a period ranging between 2 to 24 hours to obtain a polymer and then linking an inhibitor to pendant carboxyl groups of the spacers in the polymer to obtain an affinity polymer.
摘要:
Methods for dispersing and binding ceramic materials in aqueous media are disclosed. The methods utilize water-soluble polymers having pendant derivatized amide, ester or ether functionalities for dispersing and binding various classes of ceramic materials.
摘要:
Novel acetylsalicylic acid derivatives having general formula (I) are provided, in which R.sup.1 is hydrogen or methyl; R.sup.2 is --O-- or --NH--; and W is hydroxy, halogen, lower alkoxy, lower alkenyloxy, lower alkynyloxy, cycloalkyloxy, aryloxy, aralkyloxy, acyloxy, or --N(R.sup.3)(R.sup.4) wherein the lower alkoxy, the lower alkenyloxy, the lower alkynyloxy, the cycloalkyloxy, the aryloxy, the aralkyloxy, and the acyloxy are optionally substituted with hydroxy, carboxyl, lower alkoxy, lower alkyl, halogen, nitro, and amino. The invention also pertains to a polymer made from such derivatives and a medical equipment containing the polymer. The polymer is useful in the prevention of platelet aggregation thereon. ##STR1##
摘要:
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.
摘要:
Matrices for electrokinetic and chromatographic separations, based on a unique class of mono- and disubstituted (on the amido nitrogen) acrylamides (e.g., acrylamido-N-ethoxy ethanol, acrylamido-N,N-diethoxy ethanol) off erthe following advantages: a) strong resistance to the alkaline hydrolysis (most zone separations occurring at basic pH values); b) a high hydrophilicity; and c) greater porosity, due to the larger M.sub.r value of the monomers. Such matrices can be prepared as `chemically crosslinked` gels or as `physical` gels, the latter consisting of strings of monofunctional monomer in the absence of crosslinker, at concentrations above the entanglement threshold. It is moreover possible to further increment the gel porosity by polymerizing it in the presence of laterally aggregating agents (e.g., polyethylene glycol of M.sub.r 6-20,000 Da), thus obtaining matrices which allow better resolution of large M.sub.r proteins and of nucleic acid fragments; by polymerizing the matrix in the presence of a gradient of the laterally aggregating agent, it is possible to obtain a porosity gradient even at a constant percent of monomers in the gel. Finally, photopolymerization (e.g., with methylene blue and a redox couple, sodium toluene sulfinate and diphenyliodonium chloride and light), instead with the standard red/ox catalysts, prevents formation of N-oxides of amines present in the polymerizing solution.
摘要:
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.
摘要:
Low molecular weight crosslinking agents useful in coatings based on esters of acrylamidoglycolate ethers are disclosed. The copolymeric crosslinking agents of the invention are prepared by copolymerizing a reactive acrylamidoglycolate monomer such as MAGME.RTM. methyl acrylamidoglycolate methyl ether with comonomers such as methyl methacrylate or butyl acrylate. The process of preparing the copolymeric crosslinkers of the invention makes use of chain transfer agents to limit the molecular weight of the crosslinking agents to 10,000 or less.