| 摘要 |
To prepare a flame-retardant, high-temperature resistant, paperlike material based on polyimide fibres of the general formula <IMAGE> which material has a weight per unit area of between 20 and 1,100 g/m<2>, an LOI value of at least 32% of O2 and a Tg point of at least 300 DEG C, a pulp comprising an aqueous suspension of polyimide fibres and, if desired, polyimide fibrills containing structural units of the general formula (I) is converted into a nonwoven material on a papermaking machine, and this material is dewatered and dried, the polyimide fibres being employed in the comminuted state, i.e. having a fibre length of from 0.01 to 120 mm, for formation of the nonwoven material. Paperlike materials according to the invention having a weight per unit area of between 60 and 290 g/m<2> can be produced by bringing a polyimide fibre sheetlike structure which is suitable for handling into contact with a polyimide solution, and then drying and optionally compacting the structure. |
