Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
• • A—HUMAN NECESSITIES
  • A62—LIFE-SAVING; FIRE-FIGHTING
  • A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
  • A62D5/00—Composition of materials for coverings or clothing affording protection against harmful chemical agents
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2255/00—Coating on the layer surface
  • B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2255/00—Coating on the layer surface
  • B32B2255/26—Polymeric coating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/30—Properties of the layers or laminate having particular thermal properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties

Definitions

• This invention relates generally to materials and fabrics used in the manufacture
• Hot air welding has been found to be one of the most
• Multi-layered, high chemical barrier materials and fabrics have achieved wide
• vulcanized/crosslinked materials of the past i.e. , Viton ® , Neoprene, Butyl, Natural
• Durable materials are not only more expensive than limited-use fabrics from a
• the present invention presents a composition obtained by combining high
• composition has been produced which allows for enhanced durability characteristics.
• composition is, for example, comprised of a multiple layer chemical barrier
• TPO thermoplastic olefin
• the target molecular weight of the resin has generally
• range of 0.85-0.95 offer a desired compromise between processability, physical
• Composite chemical barrier fabrics with enhanced durability in accordance with the present invention show orders of magnitude increases in various measurements of durability including flex crack resistance, abrasion resistance and resistance to puncture
• Fig. 1 is an enlarged cross-sectional view of the composite chemical barrier fabric exhibiting enhanced durability characteristics having a halogen free thermoplastic olefin resin coating 14.
• Fig. 2 is an enlarged cross-sectional view having coatings (24 and 26) on both sides
• Fig. 3 is an enlarged cross-sectional view of a Responder ® substrate having a ten mil
• Fig. 4 is an enlarged cross-sectional view of a receptive substrate LLDPE surface
• FIG. 5 is an enlarged cross-sectional view of a receptive substrate having 5 mil resin
• Fig. 6 is an enlarged cross-sectional view of a resin protective coating on a sealing tape
• thermal plastic olefin coating materials exhibit an inherent thermal plastic affinity to
• the chemical barrier substrate i.e. , receptive substrate
• coatings according to the invention are generally halogen free allowing for ease of
• Blends of polymers and co-polymers of the olefin families can be suitable for use of the present invention if the extrusion coating characteristics of the
• the composite chemical barrier fabric with enhanced durability in accordance with the present invention brings together the outer surface of a chemical barrier substrate which exhibits an inherent
• thermal plastic affinity therefore allowing bonding to occur between the substrate and
• Olefin polymer materials in particular, propylene polymer materials, have been widely used in various applications, such as fibers, films, sheets and other shaped
• thermal plastic olefin materials in accordance with the present invention must exhibit certain characteristics which promote the durability of the composite chemical barrier fabric substrate and in addition of potentially utilizing copolymers and polymer blends of the thermal plastic olefins, thermal plastic elastomers of crystalline
• anomorphous content copolymers can be utilized as long as the end result sheet material when laminated onto the composite chemical barrier substrate provide a
• the composite includes a receptive substrate
• the receptive substrate 12, in this embodiment is a commercially available limited-use fabric
• the first multi-layered film sheet comprising
• ASTM F1001 chemical test battery include compounds as follows:
• the linear-low density polyethylene surface of layer 12 is extrusion coated with
• present invention has the following ASTM method physical properties.
• Adflex KS-353P thermoplastic olefin resin is excellent for
• This resin is ideal for making soft hygienic or heavy duty films. It can also be
• the TPO is suitable for applications in accordance with the
• present invention provide outstanding heat sealability and outstanding puncture
• the TPO's are plasticizer fee and have excellent low temperature impact
• the resin was processed using a single, barrier-type screw (L/D ratio 24/1)
• barrel zone temperatures were set at 480-490 degrees Fahrenheit. Head pressure was
• Puncture resistance of the composite chemical barrier was increased by 92.5% with the
• Table 4 summarizes results obtained when evaluating flex crack resistance in
• This method exposes a small tube of fabric to a high speed unidirectional flex motion.
• Post flex condition was evaluated by placing the flexed sample in a holder that could
• Embodiment #1 demonstrated more then an 800% increase in
• Embodiment #4 demonstrated more than a 650 % increase
• An alternative embodiment, 20, as shown in Fig. 2 includes 5 mil TPO
• receptive substrate 22 in this embodiment is the same Responder ® (Kappler Safety
• An alternative embodiment, 30, as shown in Fig. 3 includes a 10 mil TPO
• Embodiment #1 This embodiment demonstrates the ease with which thickness of the
• TPO coating can be controlled. In this case however, the added TPO made the final
• TPO resins have narrow molecular weight distributions.
• the target molecular weight of the resin will in large part determine the ultimate molecular weight of the resin
• Thinner coatings i.e., more flexible finished fabrics
• An alternative embodiment, 40, as shown in Fig. 4 includes a 5 mil TPO
• An alternative embodiment, 50, as shown in Fig. 5 includes 5 mil TPO
• An alternative embodiment, 60, as shown in Fig. 6 includes a 5 mil TPO
• the substrate, 62 is a sealing tape which is available through Kappler Safety
• the TPO surface, 64 is heated to its melting point and laminated down
• encapsulating chemical protective garments are constructed on poly vinyl chloride.
• TPO does not have an inherent thermoplastic affinity for PVC, therefore, it was
• TPO coated seam tape was then further laminated (TPO-side up),
• TPO-side down additional layer of TPO-coated seam tape (TPO-side down) over the sew line.
• Table 1 shows the greatest advantage of limited-use chemical protective fabrics .
• Breakthrough time is
• This invention addresses these issues by combining high chemical resistance and
• Table 2 includes several embodiments that have been made to support the potential breath and flexibility of this invention.
• Tables 3,4, and 5 include
• the preferred halogen-free TPO containing fabric is prepared by extrusion
• the outermost surface of a candidate substrate must be receptive to the TPO
• Table 5 includes several additional embodiments that have been made to support
• the degree to which the durability of limited-use materials can be enhanced can be controlled by adjusting the coating thickness and orientation (front and/or back side coating). It should be obvious that thicker coatings will increase cut, tear, puncture,
• the fabrics may be readily and economically

Landscapes

• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• General Health & Medical Sciences (AREA)
• Materials Engineering (AREA)
• Toxicology (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Business, Economics & Management (AREA)
• Emergency Management (AREA)
• Laminated Bodies (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Cites Families (2)

• 1998
  • 1998-11-23 WO PCT/US1998/025021 patent/WO2000007671A1/en not_active Application Discontinuation
  • 1998-11-23 AU AU15344/99A patent/AU1534499A/en not_active Abandoned
  • 1998-11-23 EP EP98959572A patent/EP1044039A1/de not_active Withdrawn

Non-Patent Citations (1)

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