Abstract: A method and apparatus for applying a foamed mixture of paints on a structural surface. A continuous stream of high velocity gas moves through a nozzle and is directed toward the structural surface, and two or more paints may be intermittently moved into the gas stream of the nozzle and aerated and mixed with each other and moved with the gas stream to form a foam that is applied to the structural surface. The components of the foamed mixture may include single component or plural component materials such as polyurethane foam, adhesive, and polyurea formulations, and may be moved through a volumetric metering device consisting of material heaters, a heated hose, and an applicator gun. The nitrogen gas stream fluidizes the mixture as it passes through and out of the nozzle and forms the mixture into a foam that is applied to the structural surface.

Abstract: The durability of sorting discs used on disc screens, e.g., star discs comprising a body and a plurality of fingers extending radially from the body, may be improved by increasing the deflection of the fingers. Provided are methods for improving the durability of sorting discs, and sorting discs with improved durability.

Abstract: Disclosed herein is a composition comprising an aromatic diamine that is a solid at room temperature and a stabilizing quantity of a hindered amine light stabilizer and its use as a polyurethane curing agent.

Abstract: An externally heated reaction injection molding (“RIM”) system and processes for producing polyurethane articles. The system comprises a mixing chamber for combining a prepolymer and a chain extender and one or more heating systems for heating at least one of the prepolymer and the chain extender upstream of the mixing chamber. In one embodiment, the process comprises injecting a heated prepolymer and/or a heated chain extender into a mixing chamber and initiating a curing of the prepolymer in a mixing chamber. By employing heat to decrease the viscosity of the prepolymer and/or the chain extender, prepolymers and/or chain extenders that have high room temperature viscosities or are in the solid state at room temperature, may be utilized in the RIM system.

Abstract: Polyurethane elastomer articles formed from prepolymer mixtures having free diphenylmethane diisocyanate (MDI) content from 2.0 to 5.0 wt %, based on the weight of the prepolymer mixture. The prepolymer mixtures comprise a polyester, polyether, or polycaprolactone (PCL) prepolymer and MDI. The polyurethane elastomer articles are formed by curing the prepolymer mixture with a chain extender, such as a curative comprising a methylenedianiline-sodium chloride complex. The articles have good physical properties that may weigh over 225 kg, and have a three-axis thickness greater than 10.2 cm.

Abstract: Polyurethane prepolymers having a reduced amount of unreacted monomeric diisocyanate, particularly diphenylmethane diisocyanate (MDI), prepared by distilling the prepolymer reaction product in the presence of at least one inert solvent whose boiling point is slightly below that of the monomeric diisocyanate; and to high performance cast polyurethane elastomers from the thus obtained prepolymers using diamine and/or diol chain extenders.

Abstract: The invention is directed to polyurethane prepolymers having a reduced amount of unreacted monomeric diisocyanate, particularly diphenylmethane diisocyanate (MDI), prepared by distilling the prepolymer reaction product in the presence of at least one inert solvent whose boiling point is slightly below that of the monomeric diisocyanate; and to high performance cast polyurethane elastomers from the thus obtained prepolymers using diamine and/or diol chain extenders.

Abstract: Disclosed herein is a composition comprising an aromatic diamine that is a solid at room temperature and a stabilizing quantity of a hindered amine light stabilizer and its use as a polyurethane curing agent.

Abstract: A method for rotationally casting a coating onto a flexible substrate is provided wherein the coating comprises a polyurethane composition formed from (a) a substantially linear isocyanate-terminated polyurethane prepolymer; and, (b) a curative agent containing a diol having a molecular weight of less than 250 and, optionally, a secondary aliphatic diamine. Also provided is a flexible substrate possessing the coating.

Abstract: A method for coating a substrate includes rotating the substrate about an axis, and applying a polymeric reaction mixture to a surface of the rotating substrate by ejecting the polymeric reaction mixture through a die. The die has a branched system of channels for dividing an inlet stream of the polymeric reaction mixture into plural outlet streams. The outlet streams are spaced apart from each other such that the outlet streams flow together seamlessly after application to the substrate. The die and the rotating substrate are moved longitudinally relative to each other. And the material output rate of the mixture and the relative movement of the die are synchronized with the rotational speed of the substrate in such a way that successive convolutions of polymeric reaction mixture overlap and connect together seamlessly.

Abstract: A composition of matter is disclosed wherein the composition comprises a polyurethane elastomer prepared by mixing A) a polyurethane prepolymer, B) a curative, and C) a liquid, non-reactive polydimethylsiloxane, wherein C) is present in a concentration of about 0.5 to about 25% based on the combined weight of A) plus B), and curing the mixture to form the elastomer.

Abstract: A composition of matter is disclosed wherein the composition comprises a polyurethane elastomer prepared by mixing

Abstract: Disclosed herein is a golf ball comprising a core and a cover, said cover comprising a polyurethane elastomer comprising the reaction product of: A) at least one diisocyanate monomer; B) at least one polyol that is a homopolymer of propylene oxide having a molecular weight greater than 1000; and C) at least one hydroxy or amine functional chain extender; wherein the ratio of equivalents of chain extender plus polyol to equivalents of isocyanate is in the range of from about 0.6:1 to about 1.2:1, whereby said polyurethane elastomer possesses high shear resistance and good resilience.

Abstract: Disclosed herein is a composition comprising an aromatic diamine that is a solid at room temperature and a stabilizing quantity of a hindered amine light stabilizer and its use as a polyurethane curing agent.

Abstract: Disclosed herein is a golf ball comprising a core and a cover, said cover comprising a polyurethane elastomer comprising the reaction product of:

Abstract: A method for rotationally casting a coating onto a flexible substrate is provided wherein the coating comprises a polyurethane composition formed from (a) a substantially linear isocyanate-terminated polyurethane prepolymer; and, (b) a curative agent containing a diol having a molecular weight of less than 250 and, optionally, a secondary aliphatic diamine. Also provided is a flexible substrate possessing the coating.

Abstract: Disclosed herein is a golf ball comprising a core and a cover, said cover comprising a polyurethane elastomer comprising the reaction product of: A) at least one diisocyanate monomer; B) at least one polyether polyol having a molecular weight greater than 1000 and selected from the group consisting of homopolymers of ethylene oxide, homopolymers of propylene oxide, and copolymers of ethylene oxide and propylene oxide; and C) at least one hydroxy or amine functional chain extender; wherein the ratio of equivalents of chain extender plus polyol to equivalents of isocyanate is in the range of from about 0.6:1 to about 1.2:1, whereby said polyurethane elastomer possesses high shear resistance and good resilience.

Abstract: A cast polyurethane elastomer possessing a resilience of at least about 50 percent and a clarity index of at least 80 percent is obtained by subjecting to polyurethane elastomer-forming conditions a polyurethane elastomer-forming reaction mixture comprising: a) an isocyanate selected from the group consisting of diphenyl methane diisocyanate, isocyanate obtained from the reaction of polyether diol with MDI and mixtures thereof wherein at least a major proportion by weight of the diphenyl methane diisocyanate is the 4,4′-diphenyl methane diisocyanate isomer; b) at least one polyether diol; and, c) at least one diol chain extender of the general formula: HO—(CH2)x—OH wherein x is an integer from 5 to about 16.

Abstract: A polyurethane elastomer is disclosed that comprises the reaction product of: A) a prepolymer of at least one diisocyanate and at least one polyether polyol selected from the group consisting of a homopolymer of ethylene oxide, a homopolymer of propylene oxide, and a copolymer of ethylene oxide and propylene oxide, wherein free diisocyanate has been reduced to a level of less than 1% of the prepolymer; B) at least one alkylated8 aromatic diamine in a quantity sufficient to react with about 50% to about 105% of the available isocyanate content in the prepolymer; and C) at least one catalyst in a quantity sufficient to reduce the pot life to no more than two minutes; whereby said elastomer possesses high resilience and clarity and can be processed safely and at low cost.

Abstract: A polyurethane elastomer possessing high resilience and high clarity is obtained by subjecting to polyurethane elastomer-forming conditions a polyurethane elastomer-forming reaction mixture comprising:a) an isocyanate selected from the group consisting of diphenyl methane diisocyanate, isocyanate obtained from the reaction of polyol with MDI and mixtures thereof;b) at least one polyol; and,c) at least one diol chain extender of the general formula:HO--(CH.sub.2).sub.x --OHwherein x is an integer from 5 to about 16.