摘要:
A process for the production of stable water-in-oil emulsions of hydrolysed polymers of n-vinyl amide of formula (I) in which R, R1 = H or C¿1?-C6 alkyl, by the polymerisation of compounds of formula (I) alone or mixed with other ethylenically unsaturated monomers in the presence of polymerisation initiators and emulsifiers in the form of water-in-oil emulsions to form water-in-oil polymer emulsions followed by the hydrolysis of the polymers in the form of the water-in-oil polymer emulsions in the presence of acids or bases and 1 to 30 wt % in relation to the polymers of emulsifiers, in which the emulsifiers used are mixtures of (a) 5 to 95 wt % of a block or graft copolymer of the structure (A-B)m, (A)nB or (B)nA in which A is a hydrophobic homo or copolymer with a degree of polymerisation of at least 3, B is a hydrophilic homo or copolymer with a degree of polymerisation of at least 3, m » 1 and n » 2, and (b) 5 to 95 wt % of another water-in-oil emulsifier with a molar mass of under 1000 g/mol. The polymer emulsions thus obtained may be used as retention and flocculation agents in paper production, to purify waste water and sludges in purification plants, as a dispersant and protective colloid for drilling muds and as a cement additive.
摘要:
Described are preferred processes for producing linear polyvinylpyridines. The processes involve the use of hydrogen peroxide to initiate polymerization of vinylpyridine monomers in an aqueous solvent. Processes of the invention provide good reaction rates and conversions, and are particularly advantageous in achieving control of the Mw's of the final product polymers.
摘要:
The resulting polymers are useful in any varity of applications requiring an antimicrobial agent or an active sanitizer or disinfectant including caulks, mortars, films and coatings, adhesives and the like. The polymers of this invention are also useful in medical, food preparation and personal are product applications.
摘要:
Pressure-sensitive copolymers based on acrylic monomers are provided with high adhesive performance characteristics by the inclusion of a synergistic amount of an N-vinyl lactam monomer and a glycidyl monomer with the bulk of the monomers being an alkyl acrylate and/or methacrylate esters.
摘要:
An ultraviolet-absorptive polymer material which comprises a copolymer between a methacrylic ester monomer and other vinyl monomer having a color-forming group showing an absorption peak different from that of the methacrylic ester in the ultraviolet wavelength region. This polymer material is useful as a resist material showing a high etching effect and a high resolution.
摘要:
A functional resin derived from a polyallylamine or polyvinylamine and having unsaturated C=C bonds such as allyl groups at terminals of side chains has good coating properties and strong adhesiveness to a substrate, thus can be used as protective films for various substrates, coating compositions and adhesives.
摘要:
Verfahren zur Herstellung von pulverförmigen Polymerisaten durch Polymerisation von N-Vinylcarbonsäureamiden, wasserlöslichen Estern ethylenisch ungesättigter Carbonsäuren, N-Vinylimidazolen und N-Vinylimidazolinen sowie durch Copolymerisation von N-Vinylformamid mit N-Vinylpyrrolidon oder Vinylacetat in überkritischem Kohlendioxid unter Druck und Durchmischung in Gegenwart von Radikale bildenden Initiatoren, wobei man auf 100 Gew.-Teile Monomer 100 bis 1500 Gew.-Teile Kohlendioxid einsetzt.