摘要:
The invention relates to soluble organic-inorganic compositions comprising linear and cyclic hydrosiloxanes, to a novel process for preparing them and to their use as coating materials.
摘要:
The present invention relates to hybrid coating compositions containing A) 5 to 80 wt %, based on the weight of A) and B), of an aliphatic polyisocyanate-aminosilane adduct that is the reaction product of A1) a polyisocyanate component having an average NCO functionality of 2.5 to 5.5 and an isocyanate content, based on solids, of 9 to 50 wt % and containing aliphatic polyisocyanates with A2) at least 0.7 amino equivalents, based on the NCO equivalents of A1), of an aminosilane corresponding to formula (I) (RO)nY3−nSi—CH2CH2CH2—NHZ (I), wherein R and Y represent methyl and/or ethyl, Z represents H, C1-C12 alkyl, CH2CH2CH2-Si(OR)2Y3−n and n has a value of 1, 2 or 3 and A3) optionally isocyanate-reactive compounds other than A2), and B) 20 to 95 wt %, based on the weight of A) and B), of at least one hydrolyzable silane corresponding to formula (II) QSi(OX)3 (II), wherein X represents C1 to C4 alkyl and Q represents H, C1 to C8 alkyl, phenyl, methoxy, ethoxy, 3-glycidyloxypropyl, 3-aminopropyl and methacryloxypropyl and/or hydrolyzates/condensates obtained from these silanes. The present invention also relates to the use of these coating compositions for coating various substrates, such as paints, plastics, granite, marble, metal, wood, leather and textiles.
摘要:
The present invention relates to inorganic coating compositions based on cyclic carbosiloxanes, inorganic polycondensates and &agr;,&ohgr;-functional linear oligosiloxanes, and also to a process for production thereof and to the use thereof and to a non-stick layer so obtained.
摘要:
The present invention relates to coating compositions containing 40 to 100% by weight, based on resin solids, of an alkoxysilyl-functional polyisocyanate polyurea which is reaction product of A) a polyisocyanate component having an average functionality of 2.5 to 5.5, an NCO content of 11.0 to 20.0% by weight and a monomeric diisocyanate content of less than 10% by weight, and containing at least 50% by weight of a polyisocyanate prepared from 4,4′-diisocyanatodicyclohexyl-methane with B) at least 0.7 equivalents, based on the equivalents of isocyanate groups, of an aminosilane corresponding to formula (I) (RO)nY(3−n)Si—CH2CH2CH2—NHZ (I), wherein R represents methyl or ethyl, Y represents methyl, Z represents H, a C1-C12 alkyl or CH2CH2CH2—Si(OR)nY3−n, and n is 1, 2 or 3, and C) optionally other isocyanate-reactive compounds. The present invention also relates the hydrolyzates/condensates that are prepared by adding water or an aqueous solution of a catalyst to the coating compositions according to the invention.
摘要:
The present invention relates to compounds which are substantially free from isocyanate groups, have an alkoxysilane group content (calculated as Si, MW 28) of 1 to 6% by weight, based on the weight of the compounds, and containing sufficient chemically incorporated hydrophilic groups to form a stable dispersion with water, wherein the alkoxysilane groups are incorporated as the reaction products ofa) a polyisocyanate component having a minimum average functionality of 2.4 and containing at least 50% by weight of polyisocyanate adducts andb) compounds containing secondary amino groups and alkoxysilane groups.The present invention also relates to the use of these compounds for the preparation of coatings, sealants and adhesives.
摘要:
The present invention relates to aqueous dispersions which containA) 30 to 90% by weight, based on the solids content of A) and B), of polyurethane/ureas containing 0.5 to 6% by weight, based on the weight of the polyurethane/ureas, of alkoxysilane groups (calculated as Si, MW 28) andB) 10 to 70% by weight, based on the solids content of A) and B), of colloidal silica.The present invention relates to coatings prepared from these aqueous dispersions.
摘要:
The present invention relates to a binder composition containing a) 30 to 90 wt. % of an aqueous, hydroxy- and/or amino-functional resin dispersion and b) 10 to 70 wt. % of a curing agent containing alkoxysilyl groups and having a free isocyanate group content of 10 to 23 wt. % and a viscosity of 50 to 10000 mPa.multidot.s at 23.degree. C., wherein the molar ratio of the hydroxyl groups of component a) to the isocyanate groups of component b) is 0.5:1 to 2:1. The present invention also relates to the use of these binder compositions in coating and sealing compositions.
摘要:
The present invention relates to a process for preparing polyisocyanates containing allophanate groups by reacting compounds a), which i) contain urethane groups, but which are substantially free of hydroxyl groups and isocyanate groups, ii) have an average of at least two urethane groups per molecule, iii) are prepared by reacting organic isocyanates a1) with organic hydroxyl compounds a2) and iv) have an average molecular weight of at most 2,500, with excess quantities, based on the urethane groups, of distillable organic polyisocyanates b) to form polyisocyanates containing allophanate groups and subsequently removing by distillation the unreacted excess of component b) to a residual content of less than 0.5 wt. %, provided that polyisocyanates a1) and polyisocyanates b) are different. The present invention also relates to the products obtained from this process and to their use as binders or binder components in coating compositions.
摘要:
Water-dispersible polyisocyanate compositions based on aliphatic and aromatic diisocyanates and having an NCO content, based on solids, of 6 to 21% by weight, a weight ratio of incorporated TDI units to incorporated HDI units of 6:1 to 0.1:1 and a content of ethylene oxide units, arranged within terminal polyether chains, of 5 to 40% by weight; a method for the preparation of these polyisocyanate compositions by reacting a polyisocyanate component with monovalent polyether alcohols containing ethylene oxide units at an NCO/OH equivalent ratio of 2:1 to 120:1; and aqueous coating compositions containing these polyisocyanate compositions and polyhydroxyl compounds as the binder.
摘要:
The present invention relates to olefinically unsaturated, urethane group-containing isocyanates which are prepared by reacting at an NCO/OH equivalent ratio of 4 to 40a) an isocyanate component substantially containing urethane group-free cycloaliphatic diisocyanates withb) an unsaturated alcohol component substantially containing monohydric olefinically unsaturated alcoholsand subsequently removing distillable unreacted isocyanates by distillation. The present invention also relates to a process for the preparation of these isocyanates and to their use as a binder component in one-component, coating compositions which may be cured at room temperature.