摘要:
POLYCARBODIIMIDE POLYISOCYANURATE FOAMS WHICH HAVE IMPROVED RESISTANCE TO BURNING AND WHICH ARE USEFUL AS PLASTIC FOAM BUILDING INSULATION. FROM ABOUT 3 TO ABOUT 45% OF THE TOTAL CARBODIIMIDE AND ISOCYANURATE GROUPS IN THE FOAM PLASTIC ARE PREFERABLY CARBODIIMIDE GROUPS. THE FOAMS ARE PREPARED BY POLYMERIZING AN ISOCYANATE IN THE PRESENCE OF A BLOWING AGENT, A CATALYST WHICH PROMOTES THE FORMATION OF CARBODIIMIDE GROUPS AND A CATALYST WHICH PROMOTES THE FORMATION OF ISOCYANURATE GROUPS.
摘要:
A method of producing the high molecular weight polycarbodiimide comprises the steps of providing an isocyanate component comprising toluene diisocyanate (TDI), a carbodiimidization catalyst, and a first solvent. The method further comprises the step of polymerizing the isocyanate component in the first solvent and in the presence of the carbodiimidization catalyst to produce a reaction mixture including at least one carbodiimide compound and the first solvent. In addition, the method comprises the step of combining a second solvent and the reaction mixture. Finally, the method comprises the step of polymerizing the at least one carbodiimide compound for a second period of time in the first and second solvents and in the presence of the carbodiimidization catalyst to produce the high molecular weight polycarbodiimide.
摘要:
A coating composition comprises a high molecular weight polycarbodiimide. The high molecular weight polycarbodiimide is produced via a method. A method of preparing the coating composition and a method of forming a coating on a substrate with the coating composition are also disclosed.
摘要:
A flexible polyurethane foam article exhibiting flame resistance comprises the reaction product of an isocyanate and an isocyanate-reactive component comprising a polyol reactive with the isocyanate. The isocyanate and the isocyanate-reactive component are reacted in the presence of a blowing agent and a phospholene oxide. A method of producing the flexible polyurethane foam article includes the step of reacting the isocyanate and the isocyanate-reactive component in the presence of the blowing agent and an effective amount of the phospholene oxide to form the flexible polyurethane foam article which is flame resistant.
摘要:
A method for producing compounds comprising at least one carbodiimide group is described, by reacting at least one isocyanate-containing starting compound or a derivative thereof, wherein the method is conducted in at least two stages.
摘要:
The present invention relates to a process for the preparation of carbodiimide- and/or uretonimine-modified polyisocyanates by means of microwave radiation and to the use of such polyisocyanates for the synthesis of foamed and non-foamed polyurethane materials.
摘要:
Spray polyurea elastomers and reaction systems and methods for making the same. The spray polyurea elastomers are prepared with a prepolymer formed by reacting a low 2,4null-isomer content MDI with an MDI reactive component. This prepolymer is blended with a high 2,4null-isomer content MDI to form a quasi-prepolymer. The quasi-prepolymer is reacted with an amine resin to form polyurea elastomers.
摘要:
A polyurethane composition to provide a rigid polyurethane foam suitable for use as a core material in a composite laminate and which polyurethane composition includes an additive compound or oligomer-prepolymer having hydroxy groups for reaction with the diisocyanate of the polyurethane or which has been prereacted with a diisocyanate and which contains after the polyurethane reaction ethylenically unsaturated groups, like allyl or acrylic groups, to react with an unsaturated polyester resin. The invention includes the organic additive oligomer-prepolymer and the hybrid polyester-rigid polyurethane laminates.
摘要:
An acrylic urethane prepolymer composition and an unsaturated polyester resin composition to which the prepolymer has been added. The prepolymer composition includes an acrylic urethane prepolymer prepared by the reaction of diisocyanate, such as MDI, with an hydroxyl-containing acrylate monomer, such as a pentaerythritol triacrylate. The prepolymer composition contains a styrene monomer and an inhibitor, such as benzoquinone, to retard the reaction of the prepolymer and styrene monomer prior to the addition of the prepolymer composition into the polyester resin composition and a photoinitiator to promote the polymerization of the resin by exposure to radiant energy. The employment of the urethane prepolymer composition provides for the reduction in the amount of styrene monomer used in the unsaturated resin composition and also provides for improved chemical and physical properties of the photocured, unsaturated resin composition.