摘要:
A process for the continuous production of a thermoplastic molding composition containing a mixture of a TPU and a thermoplastic (co)polymer is disclosed. The process comprises (i) introducing into an extruder via a first feed point component I) with at least 3% by weight, with respect to component I), of at least one member selected from the group consisting of components A), B) and C), and(ii) metering in the balance of said A), B) and C) into said extruder via one or more subsequent feed points, (iii) extruding components I) and II) under conditions sufficient to cause A), B) and C) reaction to form TPU, and (iv) upon the completion of said reaction, removing the resulting mixture of TPU and (co)polymer from the extruder, wherein component I) comprises 1 to 60% by weight, with respect to the total mixture, of a thermoplastic (co)polymer, and wherein component II) comprises 99 to 40% by weight, with respect to the total mixture, of the polyurethane-forming components including A) an organic diisocyanate, B) a linear polyol having terminal hydroxyl groups and a number average molecular weight of 500 to 5000, and C) a chain extender having a molecular weight of 60 to 500, and wherein the molar ratio of NCO groups in A) to the groups which react with NCO in B) and C) is in the range of 0.9 to 1.2.
摘要:
A process for the continuous production of a thermoplastic molding composition containing a mixture of a TPU and a thermoplastic (co)polymer is disclosed. The process comprises(i) introducing into an extruder via a first feed point component I) with at least 3% by weight, with respect to component I), of at least one member selected from the group consisting of components A), B) and C), and(ii) metering in the balance of said A), B) and C) into said extruder via one or more subsequent feed points,(iii) extruding components I) and II) under conditions sufficient to cause A), B) and C) reaction to form TPU, and(iv) upon the completion of said reaction, removing the resulting mixture of TPU and (co)polymer from the extruder,wherein component I) comprises 1 to 60% by weight, with respect to the total mixture, of a thermoplastic (co)polymer, and wherein component II) comprises 99 to 40% by weight, with respect to the total mixture, of the polyurethane-forming components including A) an organic diisocyanate, B) a linear polyol having terminal hydroxyl groups and a number average molecular weight of 500 to 5000, and C) a chain extender having a molecular weight of 60 to 500, and wherein the molar ratio of NCO groups in A) to the groups which react with NCO in B) and C) is in the range of 0.9 to 1.2.
摘要:
A process for the continuous production of a thermoplastic molding composition containing a mixture of TPU and a (co)polymer is disclosed. The process comprises (a) introducing into an extruder under time and temperature conditions sufficient to bring about the formation of thermoplastic polyurethane a (co)polymer, and polyurethane-forming components comprising A) an organic diisocyanate, B) a linear polyol having terminal hydroxyl groups and a molecular weight of 500 to 5000, and C) a chain extender having a molecular weight of 60 to 500, and upon completing the formation of said polyurethane (b) discharging the resulting TPU/(co)polymer mixture from the extruder. Importantly, the (co)polymer contains a flow enhancer and the molar ratio of the NCO groups in A) to the groups which react with NCO in B) and C) is 0.9 to 1.2.
摘要:
A thermoplastic molding composition comprising a thermoplastic polyurethane and a wax mixture is disclosed. The polyurethane is a product of an organic diisocyanate, a linear, hydroxyl-terminated polyol and a diol or diamine chain extender. The wax mixture contains a first mixture of an ester of a C.sub.10-45 aliphatic carboxylic acid and a diol, and an alkali metal or alkaline earth metal salt of a C.sub.10-45 aliphatic carboxylic acids, and at least one member selected from the group consisting of fatty acid ester, fatty acid amide, fatty acid ester amide and polyethylene wax.
摘要:
A thermoplastsic molding composition comprising thermoplastic polyurethane resin and about 0.05 to 2 percent of a wax is disclosed. The composition which offers processing advantages, including release and cosmetic properties, is characterized in that the wax contains acylation products of hydroxy groups and of amino groups of amino alcohols.
摘要:
The present invention relates to a process for the continuous production of thermoplastically processable polyurethanes having improved processing behaviour, wherein in a multistep reactionA) one or more linear hydroxyl-terminated polyols a) having a molecular weight of from 500 to 5000 are mixed continuously with a proportion of an organic diisocyanate b) in an NCO:OH ratio of from 2.0:1 to 5.0:1, in a mixing unit at high shear energy,B) the mixture prepared in step A) is reacted continuously to form an isocyanate-terminated prepolymer in a reactor at temperatures of >120.degree. C., until a conversion of >90%, referred to component a), is achieved,C) the prepolymer prepared in step B) is mixed with the remainder of component b), an NCO:OH ratio of from 2.05:1 to 6:1 being established overall in steps A) to C) and an NCO:OH ratio of 0.9 to 1.1 being established when all the components of steps A) to F) are included,D) the mixture prepared in step C) is cooled to a temperature of
摘要:
The present invention relates to a process for the preparation of plastics containing thermoplastic polyurethanes and optionally other components comprising (a) melting and homogenizing a thermoplastic polyurethane in an extruder, and (b) adding an isocyanate to said extruder containing the melted and homogenized thermoplastic polyurethane.
摘要:
The present invention relates to a process for the preparation of plastics containing thermoplastic polyurethanes and optionally other components comprising (a) melting and homogenizing a thermoplastic polyurethane in an extruder, and (b) adding an isocyanate to said extruder containing the melted and homogenized thermoplastic polyurethane.
摘要:
The invention is directed to a process for the production of polyurethanes suitable for thermoplastic processing comprising mixingI. at least 75% by weight of preformed thermoplastic polyurethane elastomers, or of a blend of(A) substantially bifunctional, compounds(B) substantially bifunctional chain-extending agents(C) organic diisocyanates and optionally(D) lubricants or other known additivessaid blend characterized in that it contains no peroxides and polymerization initiators which decompose into radicals under the effect of actinic light and further in that the molar ratio of the sum of said (A) and said (B) to said (C) is between 0.9 to 1.1, withII. (E) from 4 to 24% by weight of a crosslinking agent andIII. (F) from 0.01 to 3% by weight of a polymerization inhibitor and/or an antioxidant,by adding said II and said III to said I at a temperature below 230.degree. C., and the cooling the mixture to below 130.degree. C. in less than 5 minutes in a continuous extruder and optionally granulating the resulting polyurethane.
摘要:
The invention relates to a process for preparing polyether alcohols by catalytic addition of alkylene oxides onto a starter substance mixture comprising water-soluble H-functional starter substances which are solid at room temperature, alcohols which are liquid at the reaction temperature and water using alkali metal hydroxides and/or alkaline earth metal hydroxides as catalysts, wherein the amount of water is from 1.0 to 6.0% by weight, based on the weight of the starter substance mixture, and the starter substance mixture comprises no amine constituents.