摘要:
A process for the continuous polymerization of vinyl monomers to form vinyl polymers having a molecular weight M.sub.n of from 1000 to 20,000 comprisesa. carrying out the polymerization within an annular gap from 0.5 to 10 mm in width,b. confining the annular gap on the inner surface with a rotor, andc. carrying out the polymerization at from 110.degree. to 270.degree. C.
摘要:
A heat-curable aqueous coating agent contains, as a binder, a mixture or precondensate of(A) a resin possessing basic nitrogen groups and(B) a phenol resin based on a resol ether which is bonded via 0,0'-methylene ether groups and whose p-positions predominantly carry hydrogen and/or methylolalkyl ether groups.After protonation with an acid, the said coating agent is particularly useful as a binder for the cathodic electrocoating of metal articles.
摘要:
Amide-containing epoxy resin/amine adducts are prepared by a process in which an epoxy resin/amine adduct containing primary and/or secondary aminoalkyl groups is reacted with a carboxylic acid in the presence of esterification catalysts, particularly advantageously in the presence of an alcohol.The products prepared according to the invention are useful as binders for cathodic electrocoating.
摘要:
A process for the preparation of self-crosslinking, cathodic electrocoating binders by reacting polyether-polyols, which may or may not contain thio groups, with semi-blocked diisocyanates or partially blocked polyisocyanates, wherein the reaction products (A), containing blocked isocyanate groups, are reacted with a polyamine (B), some of whose amino groups may or may not be in the form of ketimine groups, in such a way that one or more amino groups of the polyamine (B) form a urea group with a blocked isocyanate group of the reaction product (A), and the self-cross-linking reaction product of (A) and (B) is converted into a water-dilutable form in the conventional manner by protonization with an acid.The coating binders prepared according to the invention may be used for cathodic electrocoating of metal articles.
摘要:
Polyadducts, free from epoxide groups, are obtained from ammonia and epoxide compounds by reacting 1 mole of ammonia with from 1.2 to 2.0 equivalents of epoxide, so that if diepoxide compounds are used products of the general formula (I) ##STR1## are obtained, while if triepoxides and/or tetraepoxide compounds are used, by themselves, or together with diepoxide compounds, products of the general formula II ##STR2## are produced; in these formulae, the E.sup.1 's are identical or different hydroxyl-containing divalent radicals and the E.sup.2 's are identical or different hydroxyl-containing trivalent or tetravalent radicals, resulting from the opening of the oxirane rings of epoxide compounds containing two, three or four epoxide groups in the molecule, n.sup.1, n.sup.3 and n.sup.5 are from 0 to 3, n.sup.2 and n.sup.4 are from 1 to 3 and X is 0 or 1, and one or more of the divalent radicals E.sup.1 in the general formula (II) may or may not be replaced by polyvalent radicals E.sup.2.The novel polyadducts can be modified by reaction with aldehydes, ketones, monoepoxide compounds, carboxylic acids, carboxylic acid esters or isocyanates, or by protonation with an acid, and may be used, for example, for the cathodic electrocoating of metallic articles.
摘要:
Surface-coating binders based on a reaction product of Mannich bases, obtained from polyhydric phenols, secondary amines and formaldehyde, with epoxy resins. The Mannich bases and/or the epoxy resins carry hydroxyl groups, bonded to aliphatic structures, which have been converted to urethane groups by reaction with partially blocked polyisocyanates. When protonized and diluted with water, the surface-coating binders may be used as cationic electrocoatings.
摘要:
The heat-curable coating agent according to the invention contains a combination of a binder, which possesses basic nitrogen groups and is rendered water-dilutable by protonation with an acid, and a crosslinking agent and, if required, pigments, fillers, corrosion inhibitors, surface coating assistants and catalysts, and the binder used is a reaction product of a dicarboxylic acid or of a dicarboxylate or of a (meth)acrylate oligomer or polymer with an adduct of a di- or triglycidyl ether and a polyamine, the polyamine containing 2 or more amine nitrogen atoms per molecule and one or more alkylene chains of 3 or more carbon atoms between the amino groups, and has an NH amine number of from 50 to 150 mg of KOH/g and is combined with aminoplasts and/or phenoplasts as crosslinking agents.The novel coating agent is useful as a binder for the cathodic electrocoating of metal articles.
摘要:
Polyadducts/polycondensates which can be diluted with water when protonated with an acid and which contain basic nitrogen groups are obtained by the polyaddition reaction of(A) a Mannich base obtained from(a) a monophenol and/or a polyphenol,(b) one or more dialkylamines of the formula ##STR1## where R.sup.1 and R.sup.2 are each alkyl or alkoxyalkyl, or are linked to one another to form a 5-membered or 6-membered ring, and(c) formaldehyde with(B) an epoxy resinand contain groups, which are bonded to aromatic rings, of the general formula ##STR2## and may or may not contain groups of the general formula ##STR3## where R.sup.3 and R.sup.4 are each alkyl, hydroxyalkyl or alkoxyalkyl, or are linked to one another to form a 5-membered or 6-membered ring, and R.sup.5 and R.sup.6 are each hydrogen or methyl.These products are useful as binders for the cathodic electrocoating of metallic articles.
摘要:
Polyadducts/polycondensates which can be diluted with water when protonated with an acid and which contain basic nitrogen groups are obtained by the polyaddition reaction of(A) a Mannich base obtained from a monophenol and/or a polyphenol, one or more secondary amines which contain one or more hydroxyalkyl groups, or a mixture of a secondary amine of this type with another secondary amine, and formaldehyde with(B) one or more epoxy resins,and contain groups, which are bonded to aromatic rings, of the formula (I) ##STR1## where R.sup.1 and R.sup.2 are each alkyl of 1 to 9 carbon atoms, or hydroxyalkyl or alkoxyalkyl, each of 2 to 10 carbon atoms, or are linked to one another to form a 5-membered or 6-membered ring, and R.sup.3 and R.sup.4 are each hydrogen or methyl.These products are useful as binders for cathodic electrocoating.
摘要:
The invention concerns polyadducts and their use.The polyadducts, possessing nitrogen-basic groups, have a mean molecular weight of from 500 to 10,000 and contain groups, attached to aromatic rings, of the general formula (I) ##STR1## where R.sup.1 and R.sup.2 are identical or different and each is hydrogen or methyl.In particular, these polyadducts are used, after protonizing with an acid, as binders for the cathodic electrocoating of metal articles.