Dsm IP Assets B.v.

Marcel Jongedijk

Reinard Steeman

Reinard Jozef Maria Steeman

Roelof R Marissen

Johann Van Elburg

Martin Antonius Van Es

Hen H Hoefnagels

Martin Antonius M A Es Van

Koen Putten Van

Van Koen Putten

Van Martin Antonius Es

Shaban Hoxha

José Meza-Cuadra

Martin Antonius Es Van

A material sheet is formed of a woven fabric of polymer tapes, wherein the width of a tape varies less than 2% on average in the longitudinal direction of the tape. Processes for the preparation of the material sheet, and to a ballistic resistant article comprising the material sheet are also provided. A ballistic resistant article which includes the material sheet exhibits excellent antiballistic properties.

Material sheet and process for its preparation

The invention relates to a process to make films and tapes from ultrahigh molecular weight polyethylene (UHMWPE) in the solid state. The films and tapes according to the invention have an improved thickness whereby the coefficient of variation of the thickness of the film of at most 6%.

Process for making a polymeric film

Ballistic resistant sheets and molded articles formed thereof are disclosed, wherein a ballistic resistant sheet includes a stack of at least 4 monolayers, each monolayer containing unidirectionally oriented reinforcing fibers with a tensile strength of between 3.5 and 4.5 GPa, and at most 20 mass % of a matrix material, the areal density of a monolayer is at least 25 g/mand with the fiber direction in each monolayer being rotated with respect to the fiber direction in an adjacent monolayer. When a plurality of the ballistic resistant sheets are formed into a pile and subjected to curved molding conditions, a homogenous curved ballistic resistant molded article is formed without irregular folding of the ballistic resistant sheets in the pile.

Ballistic resistant sheet and ballistic resistant article

Film sheet for use in antiballistic articles

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Sittard, Netherlands

Marcel Jongedijk