Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Reexamination Certificate
2001-10-09
2004-07-27
Pyon, Harold (Department: 1772)
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
C428S034100, C428S035700, C428S475800, C428S475200
Reexamination Certificate
active
06767601
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a multilayer laminate suitable for use as a packaging film. More particularly, the invention pertains to a multilayer laminate for use as a chemical barrier packaging film and suitable for packaging products such as solvent impregnated materials and motor oils.
2. Description of the Related Art
Packaging films are well known multilayered structures which may be used to store a variety of products. Regardless of the type of product stored in the package, it is necessary that the package be capable of sealing the product from contact with the atmosphere surrounding the package. For example, if the package is used to store a food product, it is necessary that the package be tailored to have good moisture and oxygen barrier properties to prevent the food from spoiling. Packaging films must also be capable of containing the product without the film degrading due to the type of product. For example, when storing chemical compositions or solvents it is important that the chemical or solvent does not corrode the package. This is particularly a concern with certain organic solvents. Organic solvents enjoy diverse application in a multitude of industries. One typical use for organic solvents is as a cleanser. In general, it is necessary to package such cleansers in plastic spray bottles that are strong enough to store the solvent without being eaten away by the solvent. However, using spray bottles to dispense an organic solvent or cleanser can cause a dangerous condition for workers who might inadvertently inhale the spray. It has therefore become useful in the art to provide a disposable cloth impregnated with an organic solvent or other cleanser without the need for a spray bottle. A consumer can thereby use the solvent impregnated cloth and dispose of it when it is no longer useful.
Although solvent impregnated cloths are available as rolls, as bulk-like baby wipes, or in loose form in bulk packages, it would be advantageous to produce such solvent impregnated cloths in individually wrapped chemical barrier packages. It is further desirable that such a package be flexible so that it can be easily stored and discarded after use of the product inside.
SUMMARY OF THE INVENTION
The invention provides a multilayered chemical barrier film comprising:
a) an inner layer comprising an unoriented nylon;
b) a middle layer comprising either a polyolefin, a metal foil, or a polyester attached to a surface of the inner layer; and
c) an outer layer comprising either a polyolefin or a polyester attached to a surface of the middle layer;
such that when the middle layer comprises a polyolefin, the outer layer comprises a polyester, and when the middle layer comprises a polyester, the outer layer comprises a polyolefin.
The invention also provides a package comprising a casing which defines an inner compartment, said casing comprising a pair of overlapping chemical barrier films, each of said chemical barrier films comprising in order from the inner part of the package to the outer part of the package:
a) an inner layer comprising an unoriented nylon;
b) a middle layer comprising either a polyolefin, a metal foil or a polyester attached to a surface of the inner layer; and
c) an outer layer comprising either a polyolefin or a polyester attached to a surface of the middle layer;
such that when the middle layer comprises a polyolefin, the outer layer comprises a polyester, and when the middle layer comprises a polyester, the outer layer comprises a polyolefin,
and wherein the overlapping chemical barrier films are sealed together by directly attached portions of the inner nylon layers around a perimeter of the inner nylon layers.
The invention further provides a package comprising a casing which defines an inner compartment, said casing comprising a single chemical barrier film, said chemical barrier film comprising in order from the inner part of the package to the outer part of the package:
a) an inner layer comprising an unoriented nylon;
b) a middle layer comprising either a polyolefin or a polyester attached to a surface of the inner layer; and
c) an outer layer comprising either a polyolefin, a metal foil, or a polyester attached to a surface of the middle layer;
such that when the middle layer comprises a polyolefin, the outer layer comprises a polyester, and when the middle layer comprises a polyester, the outer layer comprises a polyolefin,
and wherein the chemical barrier film is folded at an edge and sealed to itself by directly attached portions of the inner nylon layer around at least a portion of perimeter of the inner nylon layer.
The present invention provides a solution to the needs mentioned above.
A multilayer laminate is provided which acts as a chemical barrier and may be formed into a storage bag or container for motor oils, solvent impregnated cloths, other products. Such containers may be easily stored and disposed after product use. The nylon layer provides resistance to chemicals as well as a heat seal layer. The polyester or metal foil layer permits retention of the solvent in the package, for example. The polyolefin layer provides added strength, flexibility and puncture resistance to the structure.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the production of a chemical barrier film according to the invention, an inner layer, a middle layer and an outer layer are attached together to form a multilayered film. While the type of composition comprising the middle and outer layers may vary, it is important to the scope of the invention that the inner layer comprise an unoriented nylon structure.
Suitable nylons within the scope of the invention for use in the inner layer non-exclusively include homopolymers or copolymers selected from aliphatic polyamides and aliphatic/aromatic polyamides having a molecular weight of from about 10,000 to about 100,000. General procedures useful for the preparation of polyamides are well known to the art. Such include the reaction products of diacids with diamines. Useful diacids for making polyamides include dicarboxylic acids which are represented by the general formula
HOOC—Z—COOH
wherein Z is representative of a divalent aliphatic radical containing at least 2 carbon atoms, such as adipic acid, sebacic acid, octadecanedioic acid, pimelic acid, suberic acid, azelaic acid, dodecanedioic acid, and glutaric acid. The dicarboxylic acids may be aliphatic acids, or aromatic acids such as isophthalic acid and terephthalic acid. Suitable diamines for making polyamides include those having the formula
H
2
N(CH
2
)
n
NH
2
wherein n has an integer value of 1-16, and includes such compounds as trimethylenediamine, tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, octamethylenediamine, decamethylenediamine, dodecamethylenediamine, hexadecamethylenediamine, aromatic diamines such as p-phenylenediamine, 4,4′-diaminodiphenyl ether, 4,4′-diaminodiphenyl sulphone, 4,4′-diaminodiphenylmethane, alkylated diamines such as 2,2-dimethylpentamethylenediamine, 2,2,4-trimethylhexamethylenediamine, and 2,4,4 trimethylpentamethylenediamine, as well as cycloaliphatic diamines, such as diaminodicyclohexylmethane, and other compounds. Other useful diamines include heptamethylenediamine, nonamethylenediamine, and the like.
Useful polyamide homopolymers include poly(4-aminobutyric acid) (nylon 4), poly(6-aminohexanoic acid) (nylon 6, also known as poly(caprolactam)), poly(7-aminoheptanoic acid) (nylon 7), poly(8-aminooctanoic acid)(nylon 8), poly(9-aminononanoic acid) (nylon 9), poly(10-aminodecanoic acid) (nylon 10), poly(11-aminoundecanoic acid) (nylon 11), poly(12-aminododecanoic acid) (nylon 12), nylon 4,6, poly(hexamethylene adipamide) (nylon 6,6), poly(hexamethylene sebacamide) (nylon 6,10), poly(heptamethylene pimelamide) (nylon 7,7), poly(octamethylene suberamide) (nylon 8,8), poly(hexamethylene azelamide) (nylon 6,9), poly(nonamethylene azelamide) (nylon 9,9), poly(decamethylene azelamide) (nylon 10,9), poly(tetramethylenediamine-co-oxalic acid
Honeywell International , Inc.
Pyon Harold
Szigeti Virginia
LandOfFree
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