摘要:
Paper, board and cardboard are produced by shearing the paper stock, adding a microparticle system comprising a cationic polymer and a finely divided inorganic component to the paper stock after the last shearing stage before the head box, draining the paper stock with sheet formation and drying the sheets, by a process in which cationic polyacrylamides, polymers containing vinylamine units and/or polydiallyldimethylammonium chloride having an average molar mass Mw of in each case at least 500 000 Dalton and a charge density of in each case not more than 4.0 meq/g are used as cationic polymers of the microparticle system.
摘要:
The present invention relates to a radiation-curable binder BM consisting of a copolymer which is composed of: A) from 80 to 99% by weight of a hydroxyl-containing polyether acrylate and/or polyester acrylate A), which optionally contains a mono-, di- and/or polyamine AA) as adduct, and of B) from 1 to 20% by weight of benzophenonetetracarboxylic acid, its anhydrides and/or its esters. The invention additionally relates to processes for the preparation of the binder BM and to the use of the binders BM in radiation-curable coating compositions.
摘要:
The invention concerns the use of monomer-free saturated or unsaturated polyester resins or mixtures of saturated and unsaturated polyester resins containing structural units of general formulae (I) and/or (II), in which n=1-10, as impregnation, sealing and coating compounds for electrical engineering and electronic components and for carrier substances for flat insulating materials. ##STR1##
摘要:
Solutions of polyimide-forming substances containA) aromatic or partly aromatic diamines andB) tetraesters of imide-forming aromatic or partly aromatic tetracarboxylic acids or mixtures of these tetraesters with the corresponding tri-, di- and/or monoesters.These solutions are suitable for the production of coatings.
摘要:
A radiation-crosslinkable mixture which contains a carboxyl-containing precursor of a heterocyclic polymer, a copolymerizable ethylenically unsaturated ternary sulfonium salt, a photoinitiator and a polar aprotic organic solvent.
摘要:
Solutions of polyimide-forming starting materials are provided containing diamines and tetracarboxylic diesters; the tetracarboxylic diesters comprise a mixture of from 0.05 to 0.95 mol % of oxydiphthalic diesters and from 0.05 to 0.95 mol % of benzophenonetetracarboxylic diesters, biphenyltetracarboxylic diesters or mixtures thereof.
摘要:
Crosslinkable aqueous polyurethane dispersions having a long shelf life containA) polyurethane which have carbonyl groups, are dispersed in water in the presence of ammonia or of organic amines and are obtainable by reactinga) organic polyisocyanates withb) compounds which contain one or more active hydrogen atoms and one or more salt groups or one or more groups capable of salt formation andc) carbonyl-containing mono- and/or polyalcohols andd) if desired chain extenders ande) if desired polyhydroxy compounds having molecular weights of from 500 to 8,000, andB) polyhydrazides.
摘要:
Radiation-reactive mixtures suitable for producing insulating layers and printed circuits are composed of certain precursors for preparing polyimides, polyisoindoloquinazolinediones, polyoxiazinediones, polyquinazolinediones or polyquinazolones and aryl-containing carbonyl compounds which when excited by UV radiation are capable of hydrogen abstraction, these mixtures undergoing solubility differentiation on irradiation with actinic light.
摘要:
Pigment printing pastes and dyeing liquors containing finely divided solid dispersions of polyisocyanates which have been deactivated on the surface and have a melting point about 25.degree. C. and a particle size of from 0.1 to 15 .mu.m as crosslinking agents in an amount of from 0.1 to 6% by weight. The textile materials printed or dyed with these pastes or liqu0rs, respectively, possess good fastness properties
摘要:
Nonaqueous polymer dispersions are obtainable by polymerization of esters (A) of acrylic acid and/or methacrylic acid and/or ethylacrylic acid with C.sub.1 -C.sub.20 -alcohols in an organic solvent or a mixture of organic solvents in which the polymers formed are insoluble, and in the presence of copolymers (B) having a molecular weight of from 500 to 20,000 and obtainable by bulk or solution polymerization of monoolefinically unsaturated monomers at from 180.degree. to 400.degree. C. and from 1 to 200 bar, and the said dispersions are used for the production of finishes, coating materials and adhesives.