摘要:
The object of the invention are compounds of the formula (2) wherein R1 is H, methyl or ethyl, R2 is C1- to C4 alkyl, A is a C2- to C4 alkylene group, m is number from 10 to 400, n is 1, 2, 3, 4, or 5, a method for their production and their use in the production of polyurethane prepolymers.
摘要:
A water-dispersible polyurethane polymer useful in coating applications preferably includes a backbone having urethane linkages and at least one cycloaliphatic group having a closed aliphatic ring structure. Ethylenically unsaturated groups are preferably provided on the polyurethane polymer.
摘要:
Polyurethane elastomer foams can be prepared by mixing an isocyanate-terminated prepolymer obtained by reaction of a polyol with 3,3′-dimethylbiphenyl-4,4′-diisocyanate, with a foaming agent comprising a mixture of water, a low-molecular weight glycol having a molecular weight of 48-200, and a high-molecular weight glycol having a number average molecular weight Mn of 1000-3000 under stirring to conduct foaming reaction. The polyurethane elastomer foams so produced can have a high durability, particularly under a high load, even though a low-cost, easy-to-handle diisocyanate compound is used.
摘要:
The present invention provides methods for preparing polyurethanes from reaction components including: (a) reacting about 1 equivalent of at least one polyisocyanate; and about 0.1 to about 0.5 equivalents of at least one polyol having 2 to 18 carbon atoms to form an isocyanate functional urethane prepolymer; and (b) reacting the isocyanate functional urethane prepolymer, about 0.05 to about 1.0 equivalents of at least one branched polyol having 4 to 18 carbon atoms and at least 3 hydroxyl groups; and up to about 0.9 equivalents of at least one polyol different from the branched polyol and having 2 to 18 carbon atoms, wherein the reaction components are essentially free of polyester polyol and polyether polyol, as well as methods for preparing polyurethanes using a one pot process.
摘要:
A method for preparing carpet by using polyurethane to anneal secondary backing to a greige, comprising fibers attached to a primary backing. The polyurethane monomers are mixed just prior to application to the greige primary backing allowing the relatively low viscosity polyurethane to penetrate the fibers of the primary backing to aid in fiber lock. The polyurethane is puddle between two rollers that coat a layer of polyurethane onto the greige. The polyurethane coated greige is then contacted with the secondary backing before complete polymerization to insure sufficient tack to hold the backings together resulting in a durable carpet requiring a relatively low weight of polyurethane monomers.
摘要:
The present invention provides polyurethanes including a reaction product of components including: (a) about 1 equivalent of at least one polyisocyanate; (b) about 0.05 to about 1 equivalents of at least one branched polyol having 4 to 18 carbon atoms and at least 3 hydroxyl groups; (c) about 0.01 to about 0.3 equivalents of at least one polycarbonate diol; and (d) about 0.1 to about 0.9 equivalents of at least one polyol different from the branched polyol and having 2 to 18 carbon atoms, wherein the reaction product components are essentially free of polyether polyol and the reaction components are maintained at a temperature of at least about 100° C. for at least about 10 minutes; compositions, coatings and articles made therefrom and methods of making the same.
摘要:
A process for producing a powdered thermoplastic polyurethane urea resin is disclosed, which includes a step of forming a polyurethane urea resin by reacting a polymer polyol (a), an organic polyisocyanate (b), a monofunctional active hydrogen-containing compound (c), and preferably a bifunctional active hydrogen-containing compound (d) in specific proportions to form an isocyanate-terminated prepolymer, and subjecting the isocyanate-terminated prepolymer and water (e) to chain extension reaction in a non-aqueous dispersion medium. According to this production process, a powdered thermoplastic polyurethane urea resin having excellent melt formability can be obtained, and it is easy to control a molecular weight of the polyurethane urea resin.
摘要:
The invention relates to aqueous dispersions of nanoureas which have a defined charge density on the particle surface, to a process for preparing them and to their use in binder.
摘要:
A water-dispersible polyurethane polymer useful in coating applications preferably includes a backbone having urethane linkages and at least one cycloaliphatic group having a closed aliphatic ring structure. Ethylenically unsaturated groups are preferably provided on the polyurethane polymer.
摘要:
The present invention provides polyurethanes including a reaction product of components comprising: (a) about 1 equivalent of at least one polyisocyanate; (b) about 0.3 to about 1 equivalents of at least one branched polyol having 4 to 18 carbon atoms and at least 3 hydroxyl groups; (c) about 0.01 to about 0.3 equivalents of at least one polyol selected from the group consisting of polyester polyol, polycaprolactone polyol and mixtures thereof; and (d) about 0.1 to about 0.7 equivalents of at least one aliphatic diol, wherein the reaction product components are essentially free of polyether polyol and amine curing agent and the reaction components are maintained at a temperature of at least about 100° C. for at least about 10 minutes; compositions, coatings and articles made therefrom and methods of making the same.