Abstract: A soft, transparent and processable thermoplastic polyurethane resin suitable in optical application is disclosed. The resin is the product of reacting a diisocyanate, a chain extender, and a mixture of polyether polyols. The mixture of polyether polyols comprise (A) a C4 polyether polyol and (B) a C2-C3 polyether polyol where the weight ratio A/B is in the range of about 85/15 to 15/85.

Abstract: The present invention relates to ethylenically unsaturated polyurethanes which are substantially free from isocyanate groups and havea) a content of .beta.,.gamma.-ethylenically unsaturated ether groups (calculated as C.dbd.C, MW 24) incorporated through allophanate groups of 0.5 to 10% by weight,b) an allophanate group content (calculated as N.sub.2 C.sub.2 HO.sub.3, MW 101) of 1 to 20% by weight andc) a total content of ethylenically unsaturated groups of (calculated as C.dbd.C, MW 24) of 1 to 15% by weight.The present invention also relates to ethylenically unsaturated polyisocyanates which contain allophanate groups and havei) an NCO content of 5 to 25% by weight,ii) a content of .beta.,.gamma.-ethylenically unsaturated ether groups (calculated as C.dbd.C, MW 24) incorporated through allophanate groups of 0.5 to 15% by weight andiii) an allophanate group content (calculated as N.sub.2 C.sub.2 HO.sub.3, MW 101) of 1 to 30%.

Abstract: The present invention relates to ethylenically unsaturated polyurethanes which are substantially free from isocyanate groups and havea) a total content of (meth)acryloyl groups (calculated as C=C, MW 24) of 1 to 20% by weight.b) an allophanate group content (calculated as N.sub.2 C.sub.2 HO.sub.3, MW 101) of 1 to 20% by weight andc) an isocyanurate group content (calculated as N.sub.3,C.sub.3,O.sub.3, MW 126) of up to 18% by weight,in which the allophanate and isocyanurate groups are prepared from aliphatic polyisocyanates.The present invention also relates to a one-component coating composition containing these ethylenically unsaturated polyurethanes.

Abstract: The present invention relates to ethylenically unsaturated polyurethanes which are substantially free from isocyanate groups and havea) a content of .beta.,.gamma.-ethylenically unsaturated ether groups (calculated as C.dbd.C, MW 24) incorporated through allophanate groups of 0.5 to 10% by weight,b) an allophanate group content (calculated as N.sub.2 C.sub.2 HO.sub.3, MW 101) of 1 to 20% by weight andc) a total content of ethylenically unsaturated groups of (calculated as C.dbd.C, MW 24) of 1 to 15% by weight.The present invention also relates to ethylenically unsaturated polyisocyanates which contain allophanate groups and havei) an NCO content of 5 to 25% by weight,ii) a content of .beta.,.gamma.-ethylenically unsaturated ether groups (calculated as C.dbd.C, MW 24) incorporated through allophanate groups of 0.5 to 15% by weight andiii) an allophanate group content (calculated as N.sub.2 C.sub.2 HO.sub.3, MW 101) of 1 to 30%.

Abstract: The present invention relates to aqueous dispersions of polyurethanes containing hydantoin groups (calculated as C.sub.3 N.sub.2 O.sub.2, MW 96) in an amount of 1 to 40% by weight, based on resin solids. The present invention also relates to the use of these dispersions for preparing coatings with excellent hydrolytic and thermal stability.

Abstract: The present invention relates to aqueous dispersions of polyureas containing hydantoin groups (calculated as C.sub.3 N.sub.2 O.sub.2, MW 96) in an amount of 1 to 40% by weight, based on resin solids. The present invention also relates to the use of these dispersions for preparing coatings having excellent hydrolytic and thermal stability.

Abstract: The present invention is directed to a process for preparing an aqueous polyisocyanate dispersion which has an isocyanate content of at least 0.

Abstract: The present invention is directed to a continuous process for the production of aqueous polyurethane-urea dispersions by(a) mixing an emulsifiable isocyanate-terminated prepolymer with an aqueous medium in a low shear, stator-rotor dynamic mixer operating at a speed of about 500 to 8000 rpm utilizing a mixing wattage of about 0.3 to 10.0 watts/cubic centimeter and a mixing volume of at least about 0.1 liters, the average residence time of the aqueous medium and the prepolymer being about 1 to 30 seconds and the overall flow rate through the dynamic mixer being at least about 50 kg/h and(b) reacting the dispersed isocyanate-terminated prepolymer prepared in (a) with a polyamine chain extender to form an aqueous polyurethane-urea dispersion.

Abstract: The present invention is directed to a continuous process for the production of aqueous polyurethane-urea dispersions by(a) mixing an emulsifiable isocyanate-terminated prepolymer with an aqueous medium in a low shear, stator-rotor dynamic mixer operating at a speed of about 500 to 8000 rpm utilizing a mixing wattage of about 0.3 to 10.0 watts/cubic centimeter and a mixing volume of at least about 0.1 liters, the average residence time of the aqueous medium and the prepolymer being about 1 to 30 seconds and the overall flow rate through the dynamic mixer being at least about 50 kg/h and(b) reacting the dispersed isocyanate-terminated prepolymer prepared in (a) with a polyamine chain extender to form an aqueous polyurethane-urea dispersion.