Flexible sheet, method of manufacturing said sheet and applications thereof
AssigneeDsm IP Assets B.V.
InventorsDietrich Wienke, Roelof Marissen, Martinus Johannes Nicolaas Jacobs, Wilheimus Gerardus Marie Bruls, Francois Antoine Marie Op Den Buijsch, Leonardus Jacobus Johannus Welzen
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Abstract
The invention relates to a flexible sheet comprising (i) a woven fabric comprising yarns containing polyethylene fibers; and (ii) a plastomer layer adhered to at least one surface of said woven fabric wherein said plastomer is a semi-crystalline copolymer of ethylene or propylene and one or more C2 to C12 α-olefin co-monomers and wherein said plastomer having a density as measured according to ISO1183 of between 870 and 930 kg/m3, wherein the flexible sheet has a shrinkage of at most 1.9%.
Claims15
A flexible sheet comprising:
- (i) a woven fabric comprising yarns containing gel-spun ultrahigh molecular weight polyethylene (UHMWPE) fibers;
- and
- (ii) a plastomer layer which comprises a plastomer, wherein
- the woven fabric has a cover factor (CF) of at least 1.5 and at most 30 computed by the formula:
- CF
- =
- m
- 10
-
- pt
- =
- m
- 10
-
- T
- where
- m is the average number of individual weaving yarns per centimeter,
- p is the number of as produced yarns assembled into a weaving yarn,
- t is the linear density in tex of the yarn as produced, and
- T is the linear density in tex of the individual weaving yarn;
- and wherein
- the plastomer layer has a first part adhered to at least one surface of said woven fabric, and a second part impregnated between the yarns and/or fibers of the fabric, the second part of the plastomer layer extending throughout the fabric and being cohesively connected to the first part thereof;
- and wherein
- the plastomer is a semi-crystalline copolymer of ethylene or propylene and one or more C2 to C12 α-olefin co-monomers and wherein said plastomer has a density as measured according to ISO1183 of between 870 and 930 kg/m3;
- and wherein
- the plastomer is present in an amount to achieve an areal density (AD) of the flexible sheet which is at least 20% higher than the AD of the woven fabric;
- and wherein
- the flexible sheet has a total shrinkage of at most 1.9%.
A flexible sheet comprising:
- (i) a woven fabric comprising yarns containing gel-spun ultrahigh molecular weight polyethylene (UHMWPE) fibers having a rounded cross-section with an aspect ratio of at most 4:1;
- and
- (ii) a plastomer layer which comprises a plastomer, wherein
- the woven fabric has a cover factor (CF) of at least 1.5 and at most 30 computed by the formula:
- CF
- =
- m
- 10
-
- pt
- =
- m
- 10
-
- T
- where
- m is the average number of individual weaving yarns per centimeter,
- p is the number of as produced yarns assembled into a weaving yarn,
- t is the linear density in tex of the yarn as produced, and
- T is the linear density in tex of the individual weaving yarn;
- and wherein
- the plastomer layer has a first part adhered to at least one surface of said woven fabric, and a second part impregnated between the yarns and/or fibers of the fabric, the second part of the plastomer layer extending throughout the fabric and being cohesively connected to the first part thereof;
- and wherein
- the plastomer is a semi-crystalline copolymer of ethylene or propylene and one or more C2 to C12 α-olefin co-monomers and wherein said plastomer has a density as measured according to ISO1183 of between 870 and 930 kg/m3;
- and wherein
- the plastomer is present in an amount to achieve an areal density (AD) of the flexible sheet which is at least 20% higher than the AD of the woven fabric;
- and wherein
- the flexible sheet has a total shrinkage of at most 1.9%.
Dependencies are inferred from the claim text.