摘要:
The present invention relates to NCO prepolymers having a low content of free monomeric diisocyanate, to a process for the production of these NCO prepolymers, to polyurethanes prepared from these NCO prepolymers and to processes for the production of these polyurethanes.
摘要:
Thermoplastic polyurethanes (TPU) based on NDI are prepared by reacting specific, storage-stable NDI-based NCO prepolymers with chain extenders and granulating the largely reacted and cooled reaction melt. The TPU granules can then be processed to form shaped articles.
摘要:
The present invention relates to NCO prepolymers having a low content of free monomeric diisocyanate, to a process for the production of these NCO) prepolymers, to polyurethanes prepared from these NCO prepolymers and to processes for the production of these polyurethanes.
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:
The present invention provides an electromechanical transducer comprising a dielectric elastomer with contact by a first electrode and a second electrode, said dielectric elastomer comprising a polyurethane polymer comprising the reaction product of A) a polyisocyanate and/or B) a polyisocyanate prepolymer with C) a compound having at least two isocyanate-reactive groups wherein the polyisocyanate prepolymer B) and/or the compound C) having at least two isocyanate-reactive groups comprise polytetramethylene glycol ether units of the formula (I): —[O—CH2-CH2-CH2-CH2-]n (I) where n≧25; and with a minimum value nmin for the value n and a maximum value nmax for the value n in the formula (I) selected such that the difference between nmax and nmin is ≧0 to ≦4. The present invention further provides a process for producing such an electromechanical transducer, and to an electric and/or electronic device including the inventive electromechanical transducer.
摘要:
The present invention relates to polyurethane/polyurea elastomers (PU elastomers) having improved processing characteristics, such as for example extended casting time and reduced brittleness, and occupational health and safety advantages, such elastomers being suitable for replacing elastomers based on TDI prepolymers in comparable applications, and to a process for their production and their use.
摘要:
Polyurea systems comprising: (a) an amino-functional aspartic ester of the general formula (I) wherein X represents an n-valent organic radical derived from a corresponding n-functional primary amine X(NH2)n, R1 and R2 each independently represent an organic radical having no Zerevitinov active hydrogens and n represents an integer of at least 2; and (b) an isocyanate functional prepolymer having a residual monomer content of less than 1% by weight, the prepolymer prepared by reacting: (b1) an aliphatic isocyante; and (b2) a polyol component having a number average molecular weight of ≧400 g/mol and an average OH functionality of 2 to 6, wherein the polyol component comprises one or more constituents selected from the group consisting of polyester polyols, polyester-polyether polyols and mixtures thereof; processes for making the same; postoperative adhesions barriers prepared therewith and dispensing systems for such polyurea systems.
摘要:
The invention relates to composite elements comprising a thermoplastic polymer and an adjacent polyurethane bonded thereto, to a process for production thereof and to the use thereof.
摘要:
The invention is directed to novel poly(ether-ester)polyols, processes for their production from monocarboxylic or polycarboxylic acid esters with one or more bound polyether chain(s). This invention also relates to the production of polyurethane materials in which the isocyanate-reactive component comprises these poly(ether-ester)polyols.