EP0672590A2

EP0672590A2 - Bulk storage and shipping containers

Info

Publication number: EP0672590A2
Application number: EP95102710A
Authority: EP
Inventors: Karl John Jwuc
Original assignee: BF Goodrich Corp
Current assignee: Goodrich Corp
Priority date: 1994-02-25
Filing date: 1995-02-24
Publication date: 1995-09-20
Also published as: EP0672590A3

Abstract

A molded bulk container assembly of plastic material for the storage, shipping, and handling of liquid or solids as well as hazardous materials. The container assembly includes a container (11) and a lid (12) for sealing engagement with such container. Preferably these plastic parts are molded from norbornene-functional monomers using the reaction injection molding process. The container has a circular bottom wall (14) and a side wall (17) that tapers outwardly therefrom and terminates into an annular edge (18). The lid has a circular body portion and an upwardly extending annular rim (26) with an annular recess (27) that extends upward thereinto to define an interior and an exterior circumferentially extending wall section (28,29). The interior wall section has an annular recess (32,34) which receive sealing gaskets (35,36) while the exterior wall section is recessed (38) to cooperate with an adjacent shoulder (19) on the uppermost portion of the side wall to define an annular groove that receives a flexible locking strip (46).

Description

Background of the Invention

The present invention relates to a container assembly and more particularly to a bulk container and lid and to the process of making them.
Bulk container assemblies for use in the storage, containing, and transportation of hazardous materials requires that they be light weight, of great mechanical strength, corrosion resistant, and sufficiently strong to withstand the rigors of rough handling, particularly due to the new stringent standards required by the Department of Transportation (D.O.T.). These standards require rigorous and demanding tests including the dropping of the filled container assembly on its lid at any angle without breaking the seal or causing any leakage. These storage container assemblies must be constructed to withstand the rigors of the transportation and storage of nuclear or hazardous materials under adverse conditions. One solution to the problem of insuring positive sealing between the lid and the container proper has been to provide a threaded interconnecting lock between these parts, but it has been found that this type of connection does not guarantee the prevention of leakage since reliance on the threads do not provide sufficient relief from the forces and deformation developed when the container is dropped on the lid where the central axis of main body of the container makes an acute angle relative to the ground.
In the present invention the lid and container construction is configured to provide a better means of distributing any impact forces at the junction of the lid with the uppermost lip or edge of the container by configuring the lid proper, which is the broad circular body portion, to lie in a plane that is lower than the annular or circumferential lip portion of the lid, which lip portion is in effect an upwardly extending ridge with an annular recess that receives fully the uppermost lip of the container. The terms "upwardly" and "downwardly" as applied to the container or the lid are respectively as viewed in the drawings.
The term bulk container as used herein means a container which has a capacity of over 30 gallons. The annular lip portion of the lid as recessed has an exterior circumferentially extending wall as well as an interior circumferentially extending wall which are substantially co-extensive in height to provide an effective self sealing engagement with the annular lip of the container especially under the condition of being dropped where the annular lip receives an angular impact on the lid. In addition, the construction of the present invention has the uppermost lip of the container with an annular abutment that compliments an annular recess on the inner wall of the exterior circumferentially extending wall of the lip portion of the lid to receive a complimentary locking strip or key.

Summary of the Invention

The present invention is directed to a container assembly for use in storing and handling hazardous materials and to the method of making such container assemblies. The container assembly has a container which receives the materials for storage or transport and a lid for cooperative engagement therewith to define a closed chamber. The container has a bottom wall, side wall, and an uppermost annular edge that receives the lid. The lid has a circular body portion that terminates into an upwardly extending annular rim which itself has an annular recess extending upwardly into the rim to facilitate the seating and sealing of the lid onto the annular edge of the container. The annular recess divides the annular rim into a circumferentially extending internal wall section, a circumferentially extending external wall section, and a bridging portion that interconnects the external wall section to the internal wall section. The lowermost portions of the upwardly extending rim lies substantially along the same plane that is coincident with the lowermost portion of the adjacent lid body portion.
It is contemplated that the bulk container portion of the present invention can have a capacity anywhere from about 30 to about 2,000 gallons. Preferably, it will be in a range of about 50 to about 500 gallons. Most commonly, however, it will range from about 80 to about 150 gallons.
The standard D.O.T. four (4) foot drop test can be used to good advantage for observing the benefits of this invention. In two variations of the test, the assembly of container and lid is dropped from a height of four feet onto a floor. In one variation, the direction is such that the edge of the lid strikes the floor at an angle of about 45° relative to the horizontal plane of the floor. In another variation, the direction is such that the axis through the center of the container is parallel to the floor. Usually, the test container assembly is filled with a suitable filler. At the time of impact, noticeable deflection occurs in the conventional lids that causes deformation and leakage. In the conventional container, there is also a noticeable deflection or deformation at the top rim portion causing leakage from the container assembly as shown by spillage of the filler.

Brief Description of the Drawings

Figure 1 is a perspective with a portion of the lid and container broken away of the container assembly showing in phantom lines a flexible strip securing means;
Figure 2 is a side elevational view, partly in cross section and partly in side elevational view of the container assembly, showing in phantom lines the bottom portion of an upper container stacked on the lid of the container assembly;
Figure 3 is a plan view of the container assembly with the lid broken away to show the upper portion of the container and a portion of the strip securing means;
Figure 4 is a sectional view of a portion of the lip of the lid and a portion of the upper edge of the container prior to mating of the parts;
Figure 5 is a sectional view of a portion of the lip of the lid and a portion of the upper edge of the container in their mating and sealing condition; and
Figure 6 is a diagrammatic cross sectional showing of the lid and adjacent portions of the container during a computer simulated impact test.

Description of an Embodiment of the Invention

Referring now to the drawings, wherein like reference numerals designate like or corresponding parts throughout the several views, there is shown in Figure 1 a molded bulk container assembly which includes a container 11 and a lid member or closure lid 12. The container 11 has a circular bottom wall 14 with a central circular portion 15 and an outer annular portion 16 whose outer periphery merges into an upwardly extending side wall 17 which terminates into a circumferentially extending upper annular edge 18. The upwardly extending side wall 17 tapers slightly outwardly from the bottom wall 14 towards the upper edge 18 to facilitate the nesting of the container 11 for shipment in its empty condition. The annular edge 18 as shown more clearly in Figures 4 and 5 is of greater cross sectional thickness then the sidewall 17 to define an annular lip or shoulder 19 at their juncture. The annular lip 19 is located downwardly from the uppermost top portion of the edge 18 to provide sufficient body and strength to the upper portion of the container. As an example of the dimension of these elements for a container having an 80-gallon nominal liquid capacity such as water, the side wall thickness would be approximately one-half inch (1.27 cm), the shoulder thickness would be approximately .68 of an inch (1.73 cm), leaving a shoulder depth of approximately .18 of an inch (.46 cm) and whose shoulder would be approximately 3/4 of an inch (1.91 cm) or greater from the uppermost portion of the container edge. This is only an example of the relative dimensions to illustrate the proportional relationship of the shoulder and related parts to illustrate the rigid nature of these parts.
The closure lid 12 is of a general circular configuration with an upperside and an underside and with an annular lip member 26 on its outer periphery. The lip member 26 as shown in Figure 4 extends in an upward direction from the adjacent body portion of the lid 12. The lip member 26 has an annular recess 27 that extends upwardly into the body portion thereof to define a circumferentially extending internal wall section 28 and an external circumferentially extending wall section 29 interconnected by a bridging section 30. These wall sections form in cross section (Figure 4) an inverted U-shaped configuration with the internal wall section 28 and the external wall section 29 being depending leg portions from the upper curvilinear bridging section 30. It is significant to note that the lowermost portion of the internal wall section 28 merges into the adjacent portion of the main body portion of the lid 12 and in effect such wall sections 28 and 29 both extend in an upwardly direction relative to body portion of lid 12 as seen in Figure 4 and any force being transmitted along the lid annular portion 40 caused by any force or impact on wall 29 tends to force such leg sections or wall sections 28 and 29 together to more firmly seal the wall of the received container wall. The interior wall section 28 as seen in Figure 4 has an interior wall surface with a pair of circumferentially extending recesses 32 and 34 to frictionally receive annular gaskets or O- rings 35 and 36, respectively. The exterior wall section 29 has an inner wall surface that receives an annular recess 38 wherein such recess 38 extends into the inner wall surface. The upper edge of such recess 38 is substantially in alignment with the shoulder 19 on the container 11 when the lid 12 is fully seated on the upper annular edge 18 of container 11 as illustrated in Figure 5. The annular recess 27 at the bridging portion 30 of the lip member 26 is hemitoroidal in configuration to mate with the arcuately (in cross section) shaped upper edge portion 18 of the container. The main body portion of lid 12 has an annular portion 40 and a raised central circular portion 41 to facilitate the reception of the bottom wall 14 of a second container as shown in phantom lines in Figure 2 for stacking such container assemblies for shipment or storage. As illustrated in Figures 1 and 3, the lip member 26 has a plurality of circumferentially spaced ribs 42 that extend radially inwardly and downwardly to merge with the annular portion 40 of lid 12 to provide a reinforcement therebetween and alignment for stacking.
Lip member 26 has an elongated aperture 45 that extends through the external wall section 29 and communicates with the annular recess 27 and the circumferentially extending recess 38 in such external wall section 29. As illustrated in Figure 1 a flexible strip or key 46 introduced into aperture 45 of lid member 12 is received into the annular recess 27 and guided by the annular shoulder 19, side wall 17 adjacent to shoulder 19 and by the annular recess 38 to firmly secure the lid member 12 to the container 11 as such strip 46 progresses into substantially the entire length of the annular recess 38. The flexible key 46 can be fabricated from a thermoplastic resin such as, for example, polyethylene or crosslinked polyethylene.
The container as described can be configured to a polygonal shape in cross section, preferably hexagonal to better utilize the available storage space.
The plastic container assembly (i.e., lid and container) can be made from any plastic resin that can be molded to the specified shape and dimensions of the present invention. Plastic container assemblies are generally designed for ease of molding, and the shape of the assembly is somewhat limited to shapes which may be formed along the surface of mold members and easily extracted therefrom. The size of the molded product must also be taken into account when considering a molding process. Accordingly, the containers of the present invention are preferably formed by in-mold bulk polymerization from a liquid reaction solution.
Reaction injection molding (RIM) and resin transfer molding (RTM) are forms of in-mold bulk polymerization. RIM and RTM differ from thermoplastic injection molding in that lower pressures and temperatures are employed. The primary distinction between injection molding and RIM/RTM is that a chemical reaction takes place in the mold to transform a monomer solution to a solid, ridged, polymeric state. In a typical RIM process, two liquid reactant streams are combined in a mixhead of a RIM machine, and the mixture is then conveyed into a mold where the polymerization reaction occurs. Typical polymers that are manufactured in the RIM process include polyurethanes, polyureas, and ring-opened norbornene-type polymers.
When polyurethanes are to be prepared, a diisocyanate is supplied in one reactant stream and a polyol is supplied in the other reactant stream. When a ring-opened norbornene-type polymer is desired, one reactant stream contains a metathesis catalyst, and the other reactant stream contains a metathesis cocatalyst. A norbornene-functional monomer can be present in either stream or in both streams.
The container assemblies of the present invention are preferably comprised of bulk polymerized norbornene-functional monomers. By norbornene-functional monomer is meant that the monomer is characterized by the presence of at least one norbornene group identified by formula I below which can be substituted or unsubstituted:

Preferred species of norbornene-functional monomers are identified by formulas II and II below:

wherein R and R¹ are independently selected from hydrogen, alkyl, alkylidenyl, aryl groups of 6 to 20 carbon atoms, and saturated and unsaturated cyclic groups containing 2 to 12 carbon atoms formed by R and R¹ together with the two ring carbon atoms connected thereto. It will be evident to those skilled in the art that the bond line between the ring carbons and the R and R¹ substituents in the formulae above represent a double bond when R and R¹ are alkylidenyl.
Examples of norbornene-functional monomers defined by formulae I, II, and III above include norbornene, dicyclopentadiene, ethylidene norbornene, dihydrodicyclopentadiene, trimers of cyclopentadiene, tetramers of cyclopentadiene, tetracyclododecene, methyltetracyclododecene, ethylidene tetracyclododecene, tetracyclododecadiene, and mixtures of the foregoing monomers.
These monomers are sufficiently low in viscosity (as opposed to hot-melt thermoplastic resin compositions) so that large intricate molds can easily be filled. The gel time of the reactive formulation (i.e., the time from the mixing of the reactive monomer streams to the time the reactive mixture reaches a gelatin-like consistency) can be controlled to allow for the slow fill of the mold under laminar flow conditions. It is necessary that the mold not be filled under turbulent flow so that bubbles do not form, which causes voids in the finished part.
Bulk polymerization of the norbornene-functional monomers is initiated at a relatively low temperature and the exotherm of the polymerization reaction is relatively short, permitting the use of plastic molds in manufacturing the container assemblies of this invention. Plastic molds are less costly than metal molds, making the molding of relatively small numbers of container assemblies economically feasible.
This invention contemplates the preparation of homopolymers and copolymers polymerized from one or more of norbornene-functional monomers.
This invention especially contemplates preparation of homopolymers and copolymers of dicyclopentadiene. Dicyclopentadiene can be copolymerized with up to about 50 percent by weight of a comonomer based upon the total weight of monomer. Preferably, the comonomer amount employed ranges from about 1 percent to about 25 percent of the total monomer employed. More preferably, the amount of comonomer employed ranges from about 1 percent to about 15 percent by weight based upon the total monomer weight. Most preferably, the amount of comonomer employed ranges from about 5 percent to about 10 percent based upon the total monomer weight. When considering preferred copolymers of dicyclopentadiene, dicyclopentadiene can be copolymerized with monomers such as trimers and tetramers of cyclopentadiene and ethylidene norbornene.
To accomplish bulk polymerization of these monomers within a mold, a suitable metathesis catalyst system is used. The metathesis catalyst system comprises a catalyst and cocatalyst component. Each component can be dissolved in separate streams of the monomer and mixed prior to transfer into the mold cavity. Suitable catalysts include molybdenum and tungsten compound catalysts such as organoammonium molybdates and organoammonium tungstates defined by the formulae below:

[R²₄N]_(2y-6x)M_xO_y; [R³₃NH]_(2y-6x)M_xO_y

where O represents oxygen; M represents either molybdenum or tungsten; x and y represent the number of M and O atoms in the molecule based on a valence of +6 for molybdenum, +6 for tungsten and -2 for oxygen; and the R² and R³ radicals can be the same or different and are selected from hydrogen, alkyl, and alkylenyl groups each containing from 1 to 20 carbon atoms and cycloaliphatic groups each containing from 5 to 16 carbon atoms. All of the R² and R³ radicals cannot be hydrogens.
Specific examples of suitable organoammonium molybdates and organoammonium tungstates include tridodecylammonium molybdates and tungstates, methyltricaprilammonium molybdates and tungstates, tri(tridecyl)ammonium molybdates and tungstates and trioctylammonium molybdates and tungstates. Preferably, from 0.1 to 10 mmole of catalyst are used per mole of total monomer. The molar ratio of catalyst to cocatalyst can vary from 200:1 to 1:10.
The cocatalyst comprises an alkyl aluminum or alkyl aluminum halide reacted with an alcohol so as to inhibit the reducing power of the cocatalyst. The reaction is rapid and results in the evolution of volatile hydrocarbons such as ethane, if diethyl aluminum is the cocatalyst. Specific examples of alkylaluminum compounds include ethylaluminum dichloride, diethylaluminum monochloride, ethylaluminum sesquichloride, diethylaluminum iodide, ethylaluminum diiodide, ethylaluminum dichloride and the like.
In providing long gel times for the norbornene-functional monomers, it is preferable to react these alkylaluminum compounds with branched or hindered alcohols and more preferable to use combinations of such alcohols with unhindered alcohols. The hindered alcohols include tertiary alcohols, secondary hindered alcohols, and primary hindered alcohols. When such alcohols are combined with unhindered alcohols, the temperature necessary to initiate gel in the reactive formulation is reduced. Specific examples of hindered secondary alcohols include 2,4-dimethyl-3-propanol, 3,5-dimethyl-4-heptanol and 2,4-diethyl-3-hexanol and the like. Specific examples of hindered primary alcohols include neopentyl alcohol, 2,2-dimethyl-1-butanol, 2,2-diethyl-1-butanol and the like. Specific examples of suitable tertiary alcohols include t-butanol, t-amylalcohol, 3-ethyl-3-pentanol and the like.
Primary alcohols and secondary alcohols which can be used in combination with the above hindered alcohols include 2-methyl-1-propanol, 2-ethyl-1-butanol and propanol. Preferably, the hindered alcohols are used in a ratio of about 60:40 hindered versus unhindered and most preferably, 2,4-dimethyl-3-propanol is used with propanol in such a ratio.
The amount of alcohol which is reacted with the aluminum compound is also indicative of the reducing power of the cocatalyst and preferably a ratio of from 1:1 to 1.25:1 total alcohol to aluminum compound is used.
A halometal activator can be used with the cocatalysts to supply halide or additional halide to the system. This halometal activator enhances the conversion of monomer to polymer. Suitable activators include chlorosilanes such as dimethylmonochlorosilane, dimethyldichlorosilane, tetrachlorosilane and the like. The amount of activator used falls in the range of 0.05 to 10 millimole per mole of norbornene-functional monomer and preferably low levels are used to prevent localized exotherms. The foregoing catalyst and cocatalyst systems are disclosed in U.S. Patent Nos. 4,380,617; 4,426,502; and 4,943,621 which are herein incorporated by reference.
Suitable additives such as fillers, impact modifiers (e.g. elastomers), antioxidants, reinforcing fibers, and pigments can be dissolved or dispersed in the monomer prior to polymerization.
Various modifications are contemplated and may obviously be resorted to by those skilled in the art without departing from the described invention as thereinafter defined by the appended claims, as only a preferred embodiment thereof has been disclosed.

Claims

A molded bulk container assembly of plastic material for use in handling bulk liquids or solids comprising: a rigid container having a bottom wall and an upwardly extending side wall that terminates into a circular edged to define an open top, a circular lid having an upperside and an underside with an annular lip member on its outer periphery, said annular lip member extending upwardly from said underside of said circular lid, said lip member having an annular recess that extends upwardly thereinto to define a circumferentially extending internal upwardly extending wall section and a circumferentially extending external downwardly extending wall section, said internal wall section and said external wall section are interconnected by a circumferentially extending bridging section to form in cross section an inverted U-shaped configuration, said annular recess is operative to receive said circular edge of said container, said internal wall section of said lid having its upper portion merging with said bridging portion, said internal wall section having a lower circumferentially extending portion merging with said upperside and said underside of said circular lid.
A molded bulk container as set forth in claim 1 wherein said plastic material comprises poly(dicyclopentadiene).
A molded bulk container as set forth in claim 1 wherein said internal wall section and said external wall section are substantially of the same height from said underside of said lid.
A molded bulk container as set forth in claim 3 wherein said lowermost portions of said internal wall section and said external wall section are chamfered toward said annular recess to guide said lid onto said open top of said container for securing said lid to said container.
A molded bulk container as set forth in claim 4 wherein said interior wall section having an inner wall surface and an outer wall surface, said inner wall surface faces said annular recess, and said interior wall section having at least one circumferentially extending recess on its inner wall surface to receive gasket means which abut and sealingly engage said side wall adjacent to said circular edge.
A molded bulk container as set forth in claim 5 wherein said plastic material comprises poly(dicyclopentadiene).
A molded bulk container as set forth in claim 6 wherein said container has a capacity greater than 30 gallons.
A molded bulk container as set forth in claim 6 wherein said container has a capacity in a range of about 50 to 500 gallons.
A molded bulk container as set forth in claim 6 wherein said exterior wall section having an inner wall surface that faces said annular recess, said exterior wall section having a circumferentially extending recess on its inner wall surface, and said circular edge of said container having a thickness that is greater than the thickness of said wall section to define an annular shoulder at their juncture that cooperates with said circumferentially extending recess in said exterior wall section to receive a flexible strip to firmly secure said lid to said container.
A molded bulk container as set forth in claim 9 wherein said plastic material comprises poly(dicyclopentadiene).
A molded bulk container as set forth in claim 9 wherein said bottom wall has an annular outer portion and a central circular portion, said annular outer portion merges into said side wall of said container and lies in a plane that is axially downwardly and below a plane that contains said central circular portion, and said lid having an annular outer portion and a raised central circular portion to facilitate the stacking of said container assemblies.
A molded bulk container as set forth in claim 3 wherein said upwardly extending side wall tapers outwardly from said bottom wall to said circular edge to facilitate the nesting of said containers within each other for shipment.
A molded bulk container as set forth in claim 12 wherein said interior wall section of said lid having an inner wall surface that faces said annular recess, said interior wall section having a pair of circumferentially extending recesses on its inner wall surface, gasket means located in said recesses of said inner wall section for abuttingly engaging said side wall.
A molded bulk container as set forth in claim 13 wherein said lid having a plurality of circumferentially spaced ribs that extend from said annular outer portion to said interior wall section to provide reinforcement to said lid.
A molded bulk container as set forth in claim 14 wherein said plastic material comprises poly(dicyclopentadiene).
A molded bulk container as set forth in claim 14 wherein said container has a capacity greater than 30 gallons.
A molded bulk container as set forth in claim 16 wherein said container has a capacity of about 50 to 500 gallons.
A molded container assembly of plastic material for use in the storage or handling of hazardous waste materials comprising a container having a circular bottom wall and an upwardly extending side wall that terminates into an annular edge, said annular edge being of greater thickness than said side wall to define a shoulder at their juncture, a lid having a top wall portion and an annular upwardly extending rim, said annular rim having an annular recess to provide an interior circumferentially extending wall section and an exterior circumferentially extending wall section interconnected by a bridging section to define in cross section an inverted U-shaped configuration with two leg portions, said interior wall section having an inner wall surface that faces said annular recess, and said interior wall section having at least one circumferentially extending recess on its inner wall surface to receive gasket means for sealingly and abutting engaging the inside wall surface of said side wall.
A molded container as set forth in claim 18 wherein said plastic material comprises poly(dicyclopentadiene).
A molded container assembly as set forth in claim 18 wherein said two leg portions of said annular rim are of substantially the same height.
A molded container assembly as set forth in claim 20 wherein said exterior wall section has an interior wall surface, and said exterior wall section having a circumferentially extending recess that extend thereinto from said interior wall surface of said exterior wall section, said exterior wall section having an aperture that extends from the outer surface of said exterior wall section to said recess of said exterior wall section, the upper wall surface of said recess in said exterior surface is in alignment with said shoulder to receive a flexible locking strip to lock said lid to said container.
A molded container assembly as set forth in claim 21 wherein said lid has a plurality of circumferentially spaced ribs that interconnect said interior wall section to said top wall portion of said lid that is closely adjacent to said upwardly extending rim.
A molded container as set forth in claim 22 wherein said plastic material comprises poly(dicyclopentadiene).
A molded lid for use with a storage or hazardous waste container, wherein said container has an upwardly extending side wall that terminates into an annular edge, and said lid having a top wall portion and an annular upwardly extending rim, said annular rim having an annular recess to provide an interior circumferentially extending wall section and an exterior circumferentially extending wall section interconnected by a bridging section to define in cross section an inverted U-shaped configuration with two leg portions, said interior wall section having an inner wall surface that faces said annular recess, and said interior wall section having at least one circumferentially extending recess on its inner wall surface to receive gasket means for sealingly and abutting engaging the inside wall surface of said side wall of a container.
A molded container as set forth in claim 24 wherein said plastic material comprises poly(dicyclopentadiene).
A molded lid as set forth in claim 24 wherein said two leg portions of said annular rim are of substantially the same height.
A molded lid as set forth in claim 26 wherein said exterior wall section has an interior wall surface, and said exterior wall section having a circumferentially extending recess that extend thereinto from said interior wall surface of said exterior wall section, said exterior wall section having an aperture that extends from the outer surface of said exterior wall section to said recess of said exterior wall section to receive a flexible locking strip to lock said lid to said container.
A molded lid as set forth in claim 27 wherein said lid has a plurality of circumferentially spaced ribs that interconnect said interior wall section to said top wall portion of said lid that is closely adjacent to said upwardly extending rim.
A molded container as set forth in claim 28 wherein said plastic material comprises poly(dicyclopentadiene).
A molded bulk container assembly of plastic material for use in the storage or handling of hazardous waste materials comprising a container having a bottom wall and an upwardly extending side wall that terminates into an edge, said edge being of greater thickness than said side wall to define a shoulder at their juncture, a lid having a laterally extending wall portion and a peripheral upwardly extending rim, said rim having a recess extending upwardly thereinto along its entire length to provide an interior extending wall section and an exterior extending wall section interconnected by a bridging section to define in cross section an inverted U-shaped configuration with two depending leg portions, and gasket means located between said container and said lid for sealingly and abuttingly engagement therebetween.
A molded bulk container assembly as set forth in claim 30 wherein the cross sectional shape of said container is polygonal in configuration.
A molded container as set forth in claim 30 wherein said plastic material comprises poly(dicyclopentadiene).
A molded bulk container assembly as set forth in claim 30 wherein the cross sectional shape of said container is hexagonal in configuration.
A molded container as set forth in claim 33 wherein said plastic material comprises poly(dicyclopentadiene).