Patent EP-1852027-A1 (EP)
Title: Shoe, in particular boot, with ABC protection
Inventor: VON BLUECHER HASSO
IPC: B32B7/02
Filed: 2004-07-28
Abstract: The safety military boots for protection against chemical warfare agents e.g. bis[2- chloroethyl]sulfide (mustard gas, lost, yellow cross liquid), comprises multilayer structures (2), which consists of an outer layer (3) turned away from the feet when worn, an inner layer (4) that is a shoe lining, an adsorbent layer (5) arranged between the outer- and the inner layer with a planar activated charcoal fibers (6), a microporous membrane (7) arranged between the outer/inner layer and the adsorbent layer, and a spacer layer (8) arranged between the adsorbent layer and the membrane. The safety military boots for protection against chemical warfare agents, comprises multilayer structures (2), which consist of an outer layer (3) turned away from the feet when worn, an inner layer (4) that is a shoe lining assigned to the outer layer and faces the feet when worn, an adsorbent layer (5) arranged between the outer- and the inner layer with a planar activated charcoal fibers (6) for adsorbing chemical warfare agents, a microporous membrane (7) arranged between the outer/inner layer and the adsorbent layer, and a spacer layer (8) in the form of a knitted fabric arranged between the adsorbent layer and the membrane. The membrane is designed in a water vapor-permeable manner. The individual layers of the layer structure are connected with one another and/or form a composite. The shoe is designed with a water and/or air-impermeable sole, which is composed of a plastic and/or rubber material. The outer layer is hydrophilized and/or hydrophobized by means of a special impregnation. The shoe lining material is designed as an air-permeable planar textile structure. The textile material is a web or knitwear or a non-woven fabric. The activated charcoal structures have a weight per unit area of 50 to 120 g/m2>. The adsorbent material is arranged on the side of a substrate that is turned away from the feet and/or the membrane serves as the substrate for the adsorbent material. The planar activated charcoal structure is an activated charcoal fabric, knitted fabric, or composite fabric. The adsorbent layer comprises of discrete activated charcoal particles in the form of grains or ball with an average diameter of 0.1 mm. The activated charcoal particles are applied on the substrate with a weight per unit area of 50 to 100 g/m2>, and have an inner surface of 800-1500 m2>/g and a burst pressure of 10 Newton and/or up to 20 Newtons per every activated charcoal grain or ball. The quantity of the catalyst is 2-8 wt.% related to the weight of the adsorbent layer. The adsorbent material is freely permeable to 70% of the chemical warfare agents. The thickness of the membrane is 5-25 mu m and/or the membrane at 25[deg]C and at a thickness of 50 mu m has a water vapor permeability of 20 l/m2> per 24hours and a water vapor resistance of a maximum of 13 (m2> Pascal)/Watt at a temperature of 35[deg]C and at a thickness of 50 mu m. The membrane is minimally swellable and/or slightly water-absorbing to a maximum of 25% related to the net weight of the membrane, and is impermeable to or delays the passage of water and/or aerosols. The membrane is designed as a multilayer laminate and/or as a multilayer composite, which is composed of three inter-connected layers or plies. The laminate or the composite comprises of a central layer based on cellulose. The central layer is designed as a membrane with a thickness of 10-20 mu m. The outer layers that are connected with the central layer are designed as a membrane with a thickness of 5-20 mu m. The base layer exhibits a weight per unit area of less than 40 g/m2>. The membrane is attached on to the base layer through point-wise application of the adhesive, and represents the adhesive layer for the attachment of the adsorbent material to the base layer, or the membrane serves both as the base layer and the adhesive layer for the adsorbent material. The shoe has a barrier effect of less than 2.5 mu g/cm2> per 24 hours against chemical warfare agents as measured according to chemical research development and engineering center.