MULTILAYER COMPOSITE COMPRISING A BACKBONE FILM
The present invention relates to a multilayer composite comprising a first monolayer comprising high-performance fibers, aligned in a first direction and a first matrix material and a second monolayer comprising high-performance fibers, aligned in a second direction and a second matrix material and a third polymeric film located in between the first and the second monolayer, with the third polymeric film having a tensile modulus of at least 0.75 GPa measured by ASTM D882. Preferably the high-performance fibers comprise UHMWPE fibers. A thermoplastic polyurethane is in contact with the first monolayer to form a first outer layer of the composite and in contact with the second monolayer to form a second outer layer of the composite, opposite to the first outer layer. The present invention further relates to the use of the multilayer composite in backpacks, packs, bags, medical gear, outdoor products, sail cloths, tents, tarps, shelters, clothing, ponchos, foul weather gear, mats, outerwear, jackets, sleeping bags, lift bags, parachutes, large kites, inflatable structures, beams, balloons, backraft, inflatable gear, liferaft, inflatable sculptures, airship (HAA: High Altitude Airships), space applications, flexible circuits, footwear and umbrella's.
1 . A multilayer composite comprising:
a first monolayer comprising high-performance fibers, aligned in a first direction and a first matrix material and
a second monolayer comprising high-performance fibers, aligned in a second direction and a second matrix material and
an inner polymeric film located in between the first and the second monolayer, with the inner polymeric film having a tensile modulus of at least 0.75 GPa measured by ASTM D882.
2 . Multilayer composite according to claim 1 wherein the second fiber direction is offset relative to the first fiber direction by up to 90 degrees.
3 . Multilayer composite according to claim 1 wherein the high-performance fibers comprise polyethylene fibers.
4 . Multilayer composite according to claim 3 wherein the high-performance fibers comprise UHMWPE fibers.
5 . Multilayer composite according to claim 1 , wherein the inner polymeric film has a thickness from 1 μm-100 μm.
6 . Multilayer composite according to claim 1 wherein the inner polymeric film is chosen from the group consisting of a polyester, polyethylene, polyamide or polyvinyl fluoride.
7 . Multilayer composite according to claim 6 wherein the inner polymeric film is chosen from polyethylene terephthalate (PET), polybutylene terephthalate (PBT) or polyethylene naphtalate (PEN).
8 . Multilayer composite according to claim 1 wherein the inner polymeric film is in the form of a woven or non-woven fabric.
9 . Multilayer composite according to claim 1 wherein the inner polymeric film is a waterproof and/or (non)-breathable film.
10 . A multilayer composite according to claim 1 wherein at least one matrix material is chosen form the group of polyacrylates, polyurethanes, polyesters, silicones, polyolefins, modified polyolefins, ethylene copolymers, polyamide, polypropylene.
11 . A multilayer composite according to claim 10 wherein the first and second matrix material comprise polyurethane.
12 . Multilayer composite according to claim 1 wherein the first monolayer optionally comprises a first polymeric film and the second monolayer optionally comprises a second polymeric film.
13 . Multilayer composite according to claim 12 wherein the first polymeric film is in contact with the first monolayer to form a first outer layer of the composite and wherein the second polymeric film is in contact with the second monolayer to form a second outer layer of the composite, opposite to the first outer layer.
14 . Multilayer composite according to claim 12 wherein the first and second polymeric film is chosen from polyurethane.
15 . Use of the multilayer composite of claim 1 in backpacks, packs, bags, medical gear, outdoor products, sail cloths, tents, tarps, shelters, clothing, ponchos, foul weather gear, mats, outerwear, jackets, sleeping bags, lift bags, parachutes, large kites, inflatable structures, beams, balloons, backraft, inflatable gear, liferaft, inflatable sculptures, airship (HAA: High Altitude Airships), space applications, flexible circuits, footwear, sports apparel, luggage; leather goods, jackets, wallets, purses, upholstery, gloves.