A new process for producing orthopedic structures is provided, which comprises impregnating a fabric carrier with a solution of a polymer and removing the solvent from the impregnated carrier, which process is characterized in that the fabric carrier is impregnated with a solution in an organic solvent of a prepolymer polyurethane having two isocyanate end groups which has been formed by the reaction of a bifunctional compound reactive with an isocyanate group with a molar excess of a diisocyanate, which solution contains a chain extender and optionally a catalyst for the chain-extending reaction and the impregnated carrier is warmed to remove the solvent and to prepare the final polymer.
By the invention a new thermoplastic linear polyurethane is produced, which comprises recurring units of a prepolymeric diisocyanate, which are linked by radicals of a bifunctional chain-extender. The prepolymeric diisocyanate, which is used as a reactant for forming the linear polyurethane. has been formed by reacting a diol of the general formula
with a diisocyanate of the general formula OCN-R3-NCO. wherein R, represents an alkylene radical having 4 to 6 carbon atoms, which is unsubstituted or may be substituted with lower alkyl groups, cycloalkyl groups, lower alkoxy groups, the number of substituents being 1 to 3, the radicals R, being identical radicals or mixed radicals, R2 represents a lower alkylene radical having 2 to 6 carbon atoms. R] represents the radical of an aromatic or aliphatic diisocyanate, and Y und Z standing for -0-, -NH-, or -COO-, x and y are 10 to 20.
The process according to the invention enables to impregnate carrier materials for orthopedic structure in a one-step procedure by using highly concentrated solutions without reaching a high viscosity.
本发明提供了一种用于生产矫形结构的新工艺,该工艺包括用聚合物溶液浸渍织物载体,并从浸渍载体中除去溶剂,该工艺的特点是织物载体浸渍有两个
异氰酸酯端基的预聚物聚
氨酯在有机溶剂中的溶液,该预聚物聚
氨酯是由与
异氰酸酯基团反应的双官能团化合物与摩尔过量的二
异氰酸酯反应形成的、该溶液含有扩链剂和用于扩链反应的催化剂,将浸渍载体加热以除去溶剂并制备最终聚合物。
本发明生产出一种新型热塑性线型聚
氨酯,它由预聚二
异氰酸酯的重复单元组成,这些重复单元通过双功能扩链剂的自由基连接。预聚二
异氰酸酯是通过通式为
其中 R 代表具有 4 至 6 个碳原子的亚烷基,该亚烷基未被取代或可被低级烷基、环 烷基、低级烷氧基取代,取代基的数目为 1 至 3,R 代表相同的基或混合基,R2 代表具有 2 至 6 个碳原子的低级亚烷基。R]代表芳香族或脂肪族二
异氰酸酯基,Y 和 Z 代表-0-、-NH-或-COO-,x 和 y 为 10 至 20。
根据本发明的工艺,可以通过使用高浓度溶液,一步浸渍骨科结构的载体材料, 而不会达到很高的粘度。