Dsm IP Assets B.v.

Ernst Jan Van Klinken

Roelof R Marissen

Harm Van Der Werff

Leonard Josef Arnold Nielaba

Koen Van Putten

Johannes Maria Mathias Wilms

The invention relates to a process for the manufacture of a multilayer material sheet comprising unidirectional high performance fibers, the process comprising the steps of positioning the fibers in a parallel fashion, consolidation of the fibers to obtain a monolayer, stacking at least two monolayers such that the fiber direction in one monolayer is at an angle &#x3b1; to the direction of the fibers in an adjacent monolayer and fixation whereby the stack of at least two monolayers is subjected to a pressure and temperature treatment for a duration of a least 2 seconds, followed by cooling the stack under pressure to a temperature of 120&#xb0; C. or lower. The invention furthermore relates to the multilayer material sheet obtainable with the process according to the invention. This multilayer material sheet has a reduced uptake of liquids.

Process for the manufacture of a multilayer material sheet, multilayer material sheet and use hereof

Multilayer material sheets containing unidirectional high performance fibers are obtained by a process which includes the steps of positioning the fibers in a parallel fashion, consolidation of the fibers to obtain a monolayer, stacking at least two monolayers such that the fiber direction in one monolayer is at an angle a to the direction of the fibers in an adjacent monolayer and fixation whereby the stack of at least two monolayers is subjected to a pressure and temperature treatment for a duration of a least 2 seconds, followed by cooling the stack under pressure to a temperature of 120&#xb0; C. or lower. The multilayer material sheet has a reduced uptake of liquids.

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Berg en Terblijt, Netherlands

Ernst Jan Van Klinken