摘要:
The present invention relates to a process for the production of olefinically unsaturated polyester resins containing at least 0.025 moles of urethane groups per 100 g of resin by reactingA) olefinically unsaturated polyester resins which contain alcoholic hydroxyl groups, have a molecular weight (M.sub.n) of 800 to 10,000, an acid vlaue of 0 to 50 and a hydroxyl number of 30 to 120, and are based on the reaction product ofI) a dicarboxylic acid component containing a) 90 to 100 mole percent of maleic acid, maleic anhydride and/or fumaric acid and b) 0 to 10 mole percent of another carboxylic acid andII) 1.1 to 1.5 moles, based on one mole of the dicarboxylic acid component, of a polyol component containing c) 0.1 to 0.5 moles of at least one saturated cycloaliphatic diol having 6 to 18 carbon atoms, d) 0.5 to 0.9 moles of at least one saturated aliphatic diol having 2 to 6 carbon atoms and e) 0.1 to 0.5 moles of at least one .beta.,.gamma.-ethylenically unsaturated ether alcohol having 5 to 14 carbon atoms, withB) an organic polyisocyanate baased on a member selected from the group of biuret-, isocyanurate-, uretdione- and urethane-modified polyisocyanates having 8 to 30% by weight of (cyclo)-aliphatically bound isocyanate groups in an amount sufficient to provide a ratio of isocyanate groups of component B) to hydroxyl groups of component A) of 0.1:1 to 1:1.The present invention also relates to the olefinically unsaturated polyester resins containing urethane groups obtained by this process and to coatings prepared from coating compositions based on these olefinically unsaturated polyester resins and cured by free radical polymerization.
摘要:
A process for the preparation of isocyanurate group-containing polyisocyanates in solvents which are inert towards isocyanate groups by reacting 0.2 to 1.5% of the isocyanate groups of diisocyanatotoluene with an aliphatic monohydric alcohol having 6 to 22 carbon atoms and subsequently trimerizing at least a portion of the isocyanate groups of the urethanized diisocyanates in the form of 40 to 70 wt. % solutions in lacquer solvents which are inert towards isocyanate groups, and the use of these polyisocyanates in two-component polyurethane coating compositions.
摘要:
Unsaturated polyesters of defined composition with a low content of polyalkylene glycol radicals in a narrow molecular weight range can be dispersed in water without external emulsifiers. These dispersions produce, after hardening, water and chemical resistant coatings with good mechanical properties.
摘要:
A method for monitoring symmetrical two-wire bus lines and two-wire bus interfaces and a device for carrying out the method provides pulse weighting of low to high transitions or high to low transitions of the two wires operated in phase opposition of a two-wire bus line. The pulse chains thus obtained are used for step sequencing. In each case, one multistep shift function which is assigned to the first bus wire, is supplied with a first, constant logic read in state and can be reset to a second logic state in all-step fashion and, for all-step resetting of a similar second multistep shift function assigned to the second bus while, and vice versa, the step last achieved for each multistep shift function characterizing the respective fault state of the other bus wire. The pulse weighting is achieved by differentiation or high-pass filtering or by pulse generation controlled by state transition. For the pulse weighting, the device uses simple RC elements or edge-controlled monostable times, and for the multistep shift functions, two similar shift registers are used which can be loaded serially and clocked and reset in parallel and which can also be realized in one piece as a component of a monolithic semiconductor circuit by the previously mentioned elements. The device has a fault tolerance which can be programmed with respect to the bit width, and in conjunction with a likewise settable input cutoff frequency permits the decentralized local testing of two wire bus-type networks. The device can be made using CMOS technology, in conjunction with a very low space requirement.
摘要:
The present invention relates to hydrophilic polyurethanes having a content of (i) olefinic double bonds (expressed as C.dbd.C, molecular weight 24) of at least 1.0% by weight and (ii) ethylene oxide units incorporated through polyethylene glycol of 20 to 80% by weight, which are based on the reaction product ofa) 1.0 mole of a polyisocyanate component consisting of at least one organic polyisocyanate withb) 0.3 to 2.5 moles of at least one .beta.,.gamma.-ethylenically unsaturated ether alcohol containing 5 to 29 carbon atoms,c) 0 to 1.0 mole of at least one synthesis component containing at least two isocyanate-reactive groups and having a molecular weight of 62 to 2,000 andd) 0.25 to 0.85 moles of a polyethylene glycol component containing at least one polyethylene glycol having a molecular weight of 1,300 to 5,000,at an NCO/OH equivalent ratio, based on starting components a) to d), of 0.7:1 to 1.2:1.The present invention also relates to a water-dispersible coating composition based on a mixture of radical-curable synthetic resins containing unsaturated groups wherein the mixture containsA) 50 to 95 parts by weight of at least one non-water-dispersible synthetic resin containing unsaturated groups and having a molecular weight (M.sub.n of 500 to 10,000 andB) 5 to 95 parts by weight of a polyurethane component which possesses sufficient hydrophilicity to ensure the dispersibility of the mixture in water and which contains at least one of the previously mentioned hydrophilic polyurethanes.
摘要:
Opaquely pigmented coatings can be produced from lacquers based on monomer-free air-drying polyesters by means of UV radiation if hydroperoxides are additionally employed alongside UV initiators.
摘要:
The present invention relates to storage stable, aqueous polyurethane-polyacrylate hybrid dispersions, which are self crosslinkable at room temperature and contain A) 10 to 95 wt. %, of a polyurethane dispersion,B) 5 to 90 wt. %, of a polymer prepared in the presence of component A) from a mixture of vinyl monomers containing 0.5 to 20 wt. %, based on the total resin solids content of the hybrid dispersion, of a vinyl monomer containing acetoacetoxy groups andC) an at least difunctional primary or secondary amine, which is present in an equivalent ratio of amino groups to acetoacetoxy groups of 0.5:1 to 1.1:1,in which the wt. % of components A) and B) add up to 100, based on the total weight of components A) and B).The present invention also relates to one-component coating compositions containing these hybrid dispersions as binders and to substrates coated with these coating compositions.
摘要:
The invention relates to acryloyl-containing polyesters having acid numbers AN of 1-50 mg of KOH/g of substance and having been polymerized from cocondensed units of(A) 1.0 mole of at least one dicarboxylic anhydride,(B) 0.02-0.08 mole of at least one saturated dihydric polyether alcohol having a molecular weight Mn of about 1,000 to 2,000,(C) 0.48-0.42 mole of at least one dihydric saturated alcohol,(D) 1.0 mole of at least one trihydric saturated oxyalkylated alcohol with a degree of oxyalkylation of 2-6, up to 50 mole-% of said oxalkylated alcohol may be replaced by a trihydric, saturated, non-oxalkylated alcohol, and(E) 1.0-2.0 moles of acrylic acid, to a process for their preparation, and to their use as radiation-curable binders in aqueous emulsion preferably for coating wood and woodlike materials, for which the presence of customary external surface-active agents and reactive radiation-curable diluents is not necessary.
摘要:
Aqueous dispersion of a binder for coating compositions comprising 5-35% by weight of nitrocellulose, 0-30% by weight, based on (a) of plasticizer, 5-50% by weight of alkyd resin, 30-80% by weight of water, 0.5-10% by weight of emulsifier, and optionally 4-40% by weight of a urea resin and/or melamine resin.
摘要:
Alkyd resin lacquers which contain cellulose nitric acid esters can be prevented from "lifting" and yellowing by the addition of bis-[hydroxyphenyl]-alkanes which are substituted in the nucleus.