摘要:
A description is given of polyisocyanates of the formula I in which R and R′ are identical or different and are alkyl groups having 1-4 carbon atoms and n is on average from 1.5 to 5 and also of a process for preparing these polyisocyanates in which a polyamine of the formula II in which R, R′, and n are as defined above, is reacted with phosgene. The new polyisocyanates are suitable for producing crosslinked polyurethanes from reaction mixtures with low solvent content and for producing coating compositions or adhesives. Also described are the coating compositions and adhesives, and their use.
摘要:
The invention relates to polycarbamates of the formula I in which R and R′ are identical or different and are alkyl groups having 1-4 carbon atoms and n is a number from, on average, 2 to 5.
摘要:
Oligomeric and high molecular mass products of reaction of alkyl and aryl allophanates with nucleophilic compounds, and also low molecular mass, oligomeric and high molecular mass compounds containing lateral and/or terminal allophanate groups, and also the use of the reaction products and/or of the compounds in coating compositions, adhesives and sealing compounds or for producing films.
摘要:
An aqueous coating material preparable by mixing (A) at least one base paint comprising (a1) at least one optionally water-soluble or -dispersible binder, (a2) at least one color and/or effect pigment, and (a3) at least one water-miscible organic solvent, and further comprising if desired (a4) water, (a5) at least one crosslinking agent and/or (a6) at least one auxiliary and/or additive; (B) at least one solid, finely divided mixing varnish comprising (b1) at least one water-soluble or -dispersible, finely divided, solid binder; and (C) an aqueous medium with one another; and also a modular system for preparing aqueous coating materials, comprising (I) at least one color and/or effect module comprising at least one base paint (A), (II) at least one solid module comprising at least one solid, finely divided mixing varnish (B) and (III) at least one dispersing module comprising an aqueous medium (C).
摘要:
The present invention provides a polyurethane resin obtainable by (A) in a first reaction stage (A) reacting (a) one or more di- and/or polyisocyanates, (b) one or more compounds (b) which have at least one group which ensures dispersibility in water and more than one group which is reactive toward isocyanate groups, and (c) if desired, one or more compounds having at least 2 and not more than 3 OH groups to give an intermediate (A) having free isocyanate groups and having urethane groups, (B) in a second reaction stage (B) adding (d) one or more monoisocyanates to the intermediate (A) obtained in stage (A), and (C) subsequently reacting the resulting mixture (B) with one or more hydroxyl-containing polymers (D) to give the polyurethane resin (P), using less than 20% by weight, based on the weight of the polyurethane resin (solids content), of polyalkylene oxide diols and/or polyalkylene oxide polyols to prepare the polyurethane resin.
摘要:
A Taylor reactor (1) according to FIG. 1, comprising 1. an annular reaction volume (2) which widens in the flow direction and is defined by an outer reactor wall (3), a rotor (4) which is mounted rotatably at the end (4.1) in the reactor floor (5) and at its other end (4.2) is unmounted, and a reactor floor (5) having a seal (6) for the drive shaft (7), 2. an inlet region (8) above the reactor floor (5), having at least one side feed (8.1) and/or at least one feed (8.1) through the reactor floor (5) for the reactants and/or the process media, 3. an outlet region (9) which is disposed above the annular reaction volume (2), widens further beyond the annular reaction volume (2) in the flow direction, and subsequently tapers toward a product offtake (10), 4. a product offtake (10) which at its greatest diameter opens toward the outlet region (9) and tapers in the other direction, and 5. a pressure maintenance valve (11); and its use for continuous bulk polymerization.
摘要:
An aqueous coating material, substantially or completely free from volatile organic compounds and preparable by mixing with one another (A) at least one aqueous primary dispersion comprising dispersed and/or emulsified, solid and/or liquid polymer particles and/or dispersed solid core/shell particles with a diameter ≦500 nm, preparable by free-radical microemulsion or miniemulsion polymerization of at least one olefinically unsaturated monomer in the presence of at least one hydrophobic additive, and (B) at least one secondary aqueous polyurethane dispersion comprising at least one polyurethane and at least one light stabilizer selected from the group of the regenerable free-radical scavengers, a process for preparing it and its use.
摘要:
Copolymers (A) containing lateral, primary and/or secondary carbamate groups (a12) and groups (a31) which can be activated with actinic radiation, preparable byI. in a first process step copolymerizing (a1) a monomer containing (a11) a group of the general formula I: CH2═C(R)C(O)—O—, (I) in which the variable R is a hydrogen atom, a halogen atom, a nitrile group or an alkyl group having 1 to 10 carbon atoms, and (a12) a primary and/or secondary carbamate group, and (a2) a monomer containing (a21) a free-radically or ironically polymerizable, olefinically unsaturated double bond and (a22) a reactive functional group which is not reactive with the carbamate groups (a12) and is not polymerizable with the double bond (a21), to give the copolymer (a1/a2), and II. in a further process step, reacting the copolymer (a1/a2) with (a3) a compound containing (a31) a group which can be activated with actinic radiation and (a32) a reactive functional group complementary to the reactive functional group (a22), to give the copolymer (A); processes for preparing them, and their use.
摘要:
(Co)polymers preparable by free-radical (co)polymerization of olefinically unsaturated monomers in the presence of at least one thiocarbamate-functional organic compound, processes for preparing (co)polymers by free-radical (co)polymerization of olefinically unsaturated monomers, which involves (co)polymerizing the olefinically unsaturated monomers in the presence of at least one thiocarbamate-functional organic compound, and the use of thiocarbamate-functional organic compounds as regulators in the free-radical (co)polymerization of olefinically unsaturated monomers.