30-09-2021 дата публикации
Номер: US20210301101A1
Принадлежит:
A method for producing a film including at least 20 wt % thermoplastic polymer and 50 to 75 wt % inorganic filler, and including the steps of: providing the mixture, melting the mixture, producing a thin layer from the mixture, cooling the thin layer, producing a film, stretching the film in the longitudinal direction and in the transverse direction, wherein the particle size of the inorganic filler is at most 5 μm and the stretch ratio in the longitudinal direction and in the transverse direction is at least 3.5. The disclosure further relates to films produced by the method and to the use thereof. 2. Method according to claim 1 , wherein the stretching of the film is carried out sequentially in the longitudinal direction and in the transverse direction.3. Method according to claim 1 , wherein the stretching ratios in the longitudinal direction and in the transverse direction are in the range from 3.5 to 7.5.4. Method according to claim 1 , wherein the stretching ratios in the longitudinal direction and in the transverse direction are in the range from 4 to 7.5. Method according to claim 1 , wherein the stretching ratio in the longitudinal direction is in a range from 4 to 5.5 and the stretching ratio in the transverse direction is in a range from 4.4 to 6.6. Method according to claim 1 , wherein the at least one thermoplastic polymer is selected from the group consisting of polyethylene claim 1 , polypropylene or mixtures thereof.7. Method according to claim 1 , wherein the inorganic filler is selected from the group consisting of calcium carbonate claim 1 , carbon dust claim 1 , powder claim 1 , calcium sulphate claim 1 , barium sulphate claim 1 , kaolin claim 1 , mica claim 1 , zinc oxide claim 1 , dolomite claim 1 , calcium silicate claim 1 , glass claim 1 , silicates claim 1 , chalk claim 1 , talc claim 1 , pigment claim 1 , titanium dioxide claim 1 , silicon dioxide claim 1 , bentonite claim 1 , clay claim 1 , diatomite claim 1 , and mixtures thereof.8. ...
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