摘要:
The present invention relates to an isocyanate-free multi-component system, in particular for medical uses such as foamable wound coverings, with at least two separate components, wherein the first component comprises at least one alkoxysilane-terminated prepolymer and the second component comprises an aqueous component, wherein the aqueous component is a polyurethane dispersion.
摘要:
Methods of producing a composition comprising a crosslinkable silane-terminated polymer having at least one crosslinkable silyl group in each molecule are provided. The method may comprise providing a polymer having at least one unsaturated group and at least one alcohol hydroxyl group in each molecule and having a number average molecular weight between about 100 and about 5,000, adding to the polymer a compound having a hydrogen-silicon bond and a crosslinkable silyl group in each molecule and a hydrosilylation catalyst to thereby carry out a hydrosilylation reaction to form a composition comprising hydrosilylated polymers, wherein the hydrosilylation reaction has a hydrosilylation efficiency greater than 50% as determined by 1H-NMR, capping the hydrosilylated polymers by adding the hydrosilylated polymer to at least one isocyanate at an index of between about 100 and about 250, and reacting the isocyanate capped hydrosilylated polymer with a polyol having a nominal functionality of at least 2 to form the composition comprising a crosslinkable silane-terminated polymer.
摘要:
The invention relates to a crosslinkable one-component laminating adhesive containing (i) 25 to 80 wt % polyester prepolymers, polyether prepolymers, and/or polyurethane prepolymers that are free of NCO groups and comprise at least one crosslinkable alkoxysilane group, as well as additionally NCO groups reacted with compounds that contain no hydrolyzable groups, and the prepolymer possesses a molecular weight from 2000 to 30,000 g/mol, (ii) 75 to 20 wt % organic solvent having a boiling point of up to 130° C., (iii) 1 to 20 wt % polymers, oligomers, and/or monomers that contain one or more anhydride groups, (iv) 0 to 15 wt % additives, where the viscosity of the adhesive is between 50 and 20,000 mPas (per DIN ISO 2555), measured at 15 to 45° C.
摘要:
Embodiments of the invention provide for methods of producing a composition comprising a crosslinkable silane-terminated polymer having at least one crosslinkable silyl group in each molecule. The method comprises providing a polymer having at least one unsaturated group and at least one alcoholic hydroxyl group in each molecule, adding to the polymer a compound having a hydrogen-silicon bond and a crosslinkable silyl group in each molecule and a hydrosilylation catalyst to thereby carry out a hydrosilylation reaction to form a composition comprising hydrosilylated polyoxyalkylene polymers, reacting the hydrosilylated polyoxyalkylene polymers with at least one isocyanate in the presence of a first tin-free catalyst to form an isocyanate reacted hydrosilylated polymer, and optionally reacting the isocyanate reacted hydrosilylated polymer with a polyol having a nominal functionality of at least 2 to form a polyol reacted crosslinkable silane-terminated polymer.