Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Reexamination Certificate
1998-01-28
2001-02-06
Morris, Terrel (Department: 1771)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
C428S343000, C428S352000, C428S356000, C442S151000
Reexamination Certificate
active
06183861
ABSTRACT:
FIELD OF THE INVENTION
This invention relates generally to protective garments, equipment, and containers (i.e, boxes, bottles, and bags) and more particularly to a conformable, composite chemical barrier tape that can be used to create highly chemically resistant closures and attachments. These closures and attachments include unions made between separate items of protective equipment including garment sleeves and gloves, garment legs and boots, around hoods, over zippers, and the like. This chemically resistant tape is secured to an item by way of a pressure sensitive adhesive and its conformability will allow for the attachment of dissimilar materials and complex shapes often times found on personnel protective equipment.
BACKGROUND OF THE INVENTION
It has been common practice to use “duct-tape” for protective garments, equipment and container applications. Duct-tape was originally developed for the heating, ventilation, and air conditioning (HVAC) business as a sealing device that would minimize or eliminate air leakage from air handling systems (i.e., duct work). “Duct-tape” has found widespread application within numerous other industries unrelated to the HVAC business. “Duct-tape” can generally be characterized as a three component product consisting of a thin polyethylene film laminated to a woven cloth backing that has been coated with a desired amount of pressure sensitive adhesive. It has become common practice to utilize polyethylene based “duct-tape” as a supplemental sealing device on chemical protective clothing. The overall purpose of the tape is to control, minimize, and possibly eliminate the influx of hazardous chemicals, including solids, liquids, gases, and chemical warfare agents into the protective ensemble that would otherwise expose the wearer. Other unsupported polyethylene, and polyvinyl chloride based tapes are used in the packaging of chemicals to seal around caps on bottles, and to secure boxes. Tapes are used in these applications to prevent or minimize leakage of chemical from the container. Unfortunately, common duct-tape and unsupported polyethylene, and polyvinyl chloride based tapes only offer the user a very limited amount of chemical resistance.
SUMMARY OF THE INVENTION
The object of this invention is to provide a conformable, hand-tearable, high chemical barrier closure and attachment tape made up of a film composite or multi-layered film containing at least one stratum selected from polyvinylidene chloride, ethylene vinyl acetate, ethylene vinyl alcohol, nylon, polyvinyl alcohol, polyester, polytetraflouroethylene, fluorinated ethylene propylene, polyvinyldene chloride copolymer, acrylonitrile, Surlyn, high density polypropylene, linear-low density polypropylene, metalized polyester and the like. The film composite providing the chemical barrier is coated with an appropriate pressure sensitive adhesive which is further adhered to a woven base cloth, the cloth is further coated with additional pressure sensitive adhesive. In addition, a conformable composite chemical barrier closure and attachment tape is presented which is comprised of a film composition containing a layer of at least one of polyester with a layer of polyethylene or ethylene vinyl alcohol which can be disposed between additional layers of polyethylene. The conformable, composite chemical barrier closure and attachment tape also provides the multi-layered film with coating on the exterior of the film to promote release, unwinding characteristics from a roll so that the conformable, composite chemical barrier and attachment tape can be manufactured and stored in rolled form and yet provide immediate release upon demand from the roll. The multi-layered film can have an exposed surface of polyethylene, the film having a thickness in the range from about 0.5 mils to about 6.0 mils. The multi-layered film can have a laquer or similar coating on the exterior of the film to promote release from unwinding from a roll. The tape in accordance with the invention has a base cloth which is woven, the woven base cloth being comprised of natural or synthetic fibers including cotton, rayon, polyester, polyamide, acrylic and blends thereof. The tape has a pressure sensitive adhesive selected from natural rubber, butyl rubber, silicone, acrylic, styrene-butidiene rubber, ethylene- propylene-diene [tur] polymers and the like. The chemical resistant multiple layer film is laminated to a woven or non-woven base cloth wherein the multi-layered film is further coated with a pressure sensitive adhesive. Tapes in accordance with the invention provide a structure yielding improve chemical resistance, for example, to the 15 chemicals included on the ASTM F1001 chemical test battery as compared to competitive polyethylene duct tape and the like commonly used in the protective clothing and chemical packaging industry.
The conformable composite chemical barrier closure-attachment tapes in accordance with the present invention provide improved and novel products for protective clothing, packaging and the like to prevent or minimize chemical penetration to the protective suit wearer or prevent or minimize leakage of chemicals from containers.
REFERENCES:
patent: 3394799 (1968-07-01), Ritson
patent: 3716437 (1973-02-01), Newmen
patent: 4303724 (1981-12-01), Sergent
patent: 4705715 (1987-11-01), Decoste
patent: 4740416 (1988-04-01), Decoste
patent: 4992331 (1991-02-01), Decoste
patent: 5108815 (1992-04-01), Adams
patent: 5162150 (1992-11-01), Buis
Croskell Henry
Morris Terrel
Pratt Christopher C.
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