摘要:
A contact transparent single layer or multilayer film absorbing and/or reflecting UV radiation and short-wavelength visible light is disclosed. The film comprises at least one layer based on at least one optionally modified thermoplastic olefin homo- or co-polymer, comprising a combination of at least one organic or inorganic colored pigment or dye absorbing and/or reflecting short-wavelength visible light, and of at least one organic or inorganic compound absorbing and/or reflecting the UV radiation. The film disclosed herein can be used as a protective film against the effects of UV radiation and short-wavelength visible light, and a sewer cleaning system comprising said multilayer film as an external hose film and an inner, multilayer plastic film, and an impregnated UV-curable carrier material present between the two hose films
摘要:
Polyvinyl acetals which contain acetal moieties derived by acetalizing polyvinyl alcohol with both aliphatic aldehydes or their derivatives and with amino- and/or ammonium-substituted aldehydes display exceptional substrate adhesion when used in printing ink as binders, allowing inks without adhesion promoters to be produced.
摘要:
Polyvinyl acetals with unsaturated acetal units are obtained by means of acetalization of partly hydrolysed or fully hydrolysed vinyl ester polymers having >50 mol % of vinyl alcohol units with one or more saturated, aliphatic aldehydes and one or more unsaturated, acyclic aliphatic aldehydes, the aldehydes optionally used in the form of their hemiacetals or full acetals.
摘要:
Silicone-modified polymers of ethylenically unsaturated monomers are prepared in the form of aqueous polymer dispersions or water-redispersible polymer powders, by A) preparing a prepolymer by means of polymerization of one or more ethylenically unsaturated monomers and at least one ethylenically unsaturated silicone macromer and isolating the prepolymer, B) dissolving the prepolymer in one or more ethylenically unsaturated monomers, C) emulsifying this solution in water and polymerizing by a free-radical mechanism, and optionally D) drying the resulting aqueous dispersion of silicone-modified polymers.
摘要:
Hydrophilic silicone copolymers are the addition polymerization product of an unsaturated silicone macromer, and unsaturated polyoxyalkylene polyether, and optionally further unsaturated addition polymerizable monomers.
摘要:
The invention relates to polyvinyl alcohols and polyvinyl acetals which contain silane and can be obtained by means of a) radical polymerization of at least one vinyl ester of unbranched or branched alkyl carboxylic acids comprising between 1 and 18 C atoms, in the presence of aldehydes containing silane or the hemiacetals or full acetals thereof, b) saponification of the vinyl ester polymers obtained thereby, and optionally c) acetalation of the partially saponified or fully saponified vinyl ester polymers.
摘要:
Pulverulent ethylene-vinyl alcohol copolymers may be produced in highly pure form, in particular containing no surfactant residues, by hydrolyzing an ethylene-vinylester copolymer in alcoholic solution and precipitating the copolymer in particulate form employing a cooling temperature gradient, optionally with addition of water.
摘要:
Silane-containing polymers are prepared by the polymerization of one or more ethylenically unsaturated monomers in the presence of a silane-containing aldehyde, hemiacetal, or acetal as a regulator, optionally with further regulators as well. The silane-containing regulators produce polymers with superior properties and with improved polymerization parameters as compared to the conventional mercaptosilane regulators.
摘要:
Organosilicone and vinyl ester copolymers free from phase separation are prepared by copolymerizing at least one vinyl ester monomer with organosilicones containing difunctional silicone monomers and optionally a minor amount of monofunctional silicone monomers, in a non-aqueous solvent mixture containing at least one solvent with a transfer coefficient greater than 20·10−4 relative to vinyl acetate.
摘要:
Low molecular weight polyvinyl acetals have a solution viscosity of from 2 to 12 mPas and a degree of polymerization Pw less than 200, and are obtained by hydrolyzing a vinyl ester polymer having a solution viscosity of from 1.0 to 1.6 mPas until the content of vinyl alcohol units is ≧50 mol %, to produce a polyvinyl alcohol whose solution viscosity is from 1.0 to 2.0 mPas, and then acetalizing the resultant polyvinyl alcohol. The products may be used as binders and films of increased adhesion to substrates.