| 摘要 |
The present invention relates to a process for preparing a polymer film comprising a liquid-crystal polymer and either at least one thermoplastic polymer or a low-melting liquid crystal- polymer (LM-LCP), or a mixture thereof. The process comprises the steps of pressing either the liquid- crystal polymer alone or the polymer blend comprising said liquid-crystal polymer and the thermoplastic polymer through the inner part of a die, and the thermoplastic polymer or the LM-LCP or a mixture thereof through the outer part of a die to obtain polymer fibers; or the polymer blend comprising said liquid crystal polymer and the thermoplastic polymer through a die to obtain polymer fibers; or the mixture of the liquid-crystal polymer and the LM-LCP and optionally the thermoplastic polymer through a die to obtain polymer fibers. The polymers or polymer blend have a processing temperature of 250°C to 350°C; and b) guiding the polymer fibers obtained in step a) while still in melt through an opening to form a polymer film, characterized in that the polymer film obtained in step b) is pressed between a first pair of press rollers while the polymer film has a temperature between 220°C and 350°C and wherein the pair of press rollers has either a temperature of 220°C to 350°C or a temperature of 5 to 20°C. |
