Abstract: A method for making a bloom-free thermoplastic polyurethane is disclosed. The method entails blending a chain terminator such as monofunctional alkylene alcohol having at least 14 carbon atoms, mono-isocyanate and mono-amine, in a thermoplastic polyurethane that would, but for the blending of the chain terminator of the invention, feature a blooming defect. The polyurethane suitable for the use in the inventive process is the product of a reaction wherein reactants comprise (i) at least one hydroxy functional polyol such as polyester polyol, polyether polyol and polycarbonate polyol, having a number average molecular weight of 500 to 5000 and a hydroxyl functionality of at least 2, (ii) a chain extending compound, and (iii) an organic diisocyanate. The ratio NCO/H characterizing the relative amounts of named reactants is 0.95 to 1.05. The addition of the chain terminator renders the product bloom-free.

Abstract: A process for making a photochromic optical lens is disclosed. In a first embodiment of the process a multi-plied laminate, containing a ply of photochromic thermoplastic polyurethane (herein “TPU”) and a ply containing thermoplastic polycarbonate, is first placed in the cavity of a suitable mold. The ply that contains polycarbonate resin is placed facing the cavity. Thermoplastic polycarbonate resin is then injected into the cavity. In a second embodiment, referred to as an over-mold method, polycarbonate is first injection molded into a molding cavity to form a substrate. Photochromic TPU is, in a subsequent step, injected into the cavity to form a superstrate overlay. In both embodiments, the articles thus molded are suitable for the preparation of optical lenses.

Abstract: The present invention relates to a novel photochromic polyurethane consisting essentially of an isocyanate reactive mixture consisting essentially of: i) from about 40 to about 85% by weight of one or more polyols having a nominal functionality of from 2 to 4 and molecular weights of from 500 to 6000 g/mole; ii) from about 15 to about 60% by weight of one or more diols or triols or mixtures thereof having a functionality of from 2 to 3 and molecular weights of from 62 to 499; b) an aliphatic polyisocyanate having a functionality ranging from about 2 to about 3; and c) a photochromic compound selected from a group consisting of spirooxazines, fulgides, fulgimides, and naphthopyrans, wherein the photochromic compound is present in an amount of 0.01 to 5 parts per hundred parts by weight of the isocyanate reactive mixture.

Abstract: The present invention relates to a novel photochromic polyurethane consisting essentially of an isocyanate reactive mixture consisting essentially of: i) from about 40 to about 85% by weight of one or more polyols having a nominal functionality of from 2 to 4 and molecular weights of from 500 to 6000 g/mole; ii) from about 15 to about 60% by weight of one or more diols or triols or mixtures thereof having a functionality of from 2 to 3 and molecular weights of from 62 to 499; b) an aliphatic polyisocyanate having a functionality ranging from about 2 to about 3; and c) a photochromic compound selected from a group consisting of spirooxazines, fulgides, fulgimides, and naphthopyrans, wherein the photochromic compound is present in an amount of 0.01 to 5 parts per hundred parts by weight of the isocyanate reactive mixture.

Abstract: Blooming in certain thermoplastic polyurethane products is substantially or completely eliminated by including a chain terminator. More specifically, at least one hydroxy functional polyester polyol having a molecular weight of at least 500 and a hydroxyl functionality of at least 2, a chain extender and an organic diisocyanate are combined with a chain terminator. The chain terminator which is preferably a monofunctional compound that is reactive with an isocyanate. These reactants are used in amounts such that the of NCO/H index of the formulation is at or near 100.

Abstract: The present invention is related to a structural member comprising a laminate and an adhesive where said adhesive is the reaction product of (a) 100 parts by weight of at least one hydroxy functional material having a molecular weight of at least 300 and a hydroxy functionality of at least 2 which material is preferably selected from the group consisting of polyether polyols, polyester polyols, polyester amide polyols, and polycarbonate polyols, (b) 0.2 to 20 parts by weight of an aliphatic, aromatic and/or a cycloaliphatic diamine or triamine, and (c) an organic isocyanate in an amount sufficient to render the isocyanate index between about 70 and about 150, wherein said component (c) is not prereacted with any of the components (a) and (b). In a preferred embodiment, there is included up to 50 parts by weight of component (d) which is an aliphatic polyol having a functionality of at least 2 and a molecular weight of below 300.

Abstract: The present invention is directed to a polyol mixture comprising the reaction product of at least two polyols which normally are incompatible with each other and an organic isocyanate, the isocyanate to hydroxyl equivalent ratio being from 1:4 to 1:35.

Abstract: A novel polyether polyurethane polymer comprising the reaction product of an organic diisocyanate and a linear polyhydroxyl polyether having a molecular weight of less than 8000 and from 0.01 to 1%, by weight, of finely-divided inorganic particles is described, together with a process for producing a cast elastomer by reacting this polymer with a cross-linking or chain-extending agent.

Abstract: The present invention is directed to a liquid, diphenylmethane diisocyanate composition having an isocyanate functionality of greater than 2.0 and having an isocyanate group content of from about 20 to about 30 percent by weight prepared by reacting:(a) diphenylmethane diisocyanate with(b) a mixture of(i) from about 5 to about 20 equivalent percent of a monohydroxy alcohol,(ii) from about 25 to about 35 equivalent percent of a poly-1,2-propylene ether glycol having a molecular weight of from 134 to 700, and(iii) from about 45 to about 65 equivalent percent of a trihydroxy alcohol selected from the group consisting of trimethylolpropane, triethylolpropane, glycerin and 1,3,6-hexane triol,the total equivalent percent of (i), (ii) and (iii) being 100,the weight ratio of (a) to (b) being from 5:1 to 15:1.