摘要:
The invention relates to a process for producing polyurethane wound dressing foams comprising frothing and drying polyurethane foam compositions which comprise anionically hydrophilicized aqueous polyurethane dispersions.
摘要:
The present invention relates to two-component coating systems for producing flexible coatings. The coating systems comprise polyurethane prepolymers with allophanate structures and also amino-functional polyaspartic esters as curing agents.
摘要:
The present invention relates to compositions containing defined sol-gel materials as anti-stick coatings and to apparatus for preparing and processing polymers, such as rubbers, characterized in that they possess such an anti-stick coating containing a hydrophobic sol-gel material.
摘要:
The present invention relates to a process for producing sol-gel condensates by A1) reacting an aqueous silica sol with a silicon alkoxide and subsequently A2) converting the condensate obtained from A1) with a polyfunctional organosilane.
摘要:
The present invention relates to mixtures containing organic polymers, inorganic particles and inorganic-organic binders to organic-inorganic hybrid materials which can be produced from these mixtures and to the use of these hybrid materials.
摘要:
Processes comprising: (a) providing a composition comprising at least one silane-terminated polyurethane preploymer prepared by a process comprising: reacting (A) at least one polyether having a number average molecular weight (Mn) of 2000 to 8000 g/mol, and comprising 10 to 30 wt % ethylene oxide units based on all alkylene oxide units in the polyether; with (B) at least one isocyanate and alkoxysilane group-containing compound of the formula (I): wherein each of X, Y, and Z independently represents a C1-C8 alkyl or a C1-C8 alkoxy residue, with the proviso that at least one of X, Y, and Z represents a C1-C8 alkoxy group; and wherein R is an at least bifunctional, organic residue; (b) foaming the composition, and (c) curing the foamed composition in the presence of water; and uses of polyurethane foams prepared thereby.
摘要:
The present invention relates to innovative, nanoparticle-modified polyisocyanates, a process for their preparation and to their use in coating compositions and adhesives. The process comprises the steps of 1) reacting A) polyisocyanates with B) alkoxysilanes, and subsequently 2) incorporating by dispersion inorganic particles, optionally surface modified, having an average particle size of less than 200 nm as determined by means of dynamic light scattering in dispersion, where the alkoxysilanes are according to formula (I) Q-Z—SiXaY3-a (I) in which Q is an isocyanate-reactive group, X is a hydrolysable group, Y is identical or different alkyl groups, Z is a C1-C12 alkylene group and a is an integer from 1 to 3.
摘要:
Layered composite useful as wound dressing, comprising a base layer, an absorbent layer atop the base layer, and also a covering layer, wherein the covering layer is bonded to both the base layer and the absorbent layer and wherein the base layer comprises a polyurethane foam obtained by a composition comprising an aqueous, anionically hydrophilicized polyurethane dispersion that has been frothed and dried.
摘要:
The invention relates to innovative compositions containing polyisocyanates containing allophanate groups and polyamines, preferably aromatic diamines, and optionally further polyisocyanates, preferably polyisocyanates containing uretdione groups, and also their use for producing quick-curing polyurea coatings.