Plastic shipping and storage containers and composition and method therefore

• US 7,216,592 B2
• Filed: 09/26/2003
• Issued: 05/15/2007
• Est. Priority Date: 11/21/2001
• Status: Expired due to Fees

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Perez, Mario A., Driscoll, Paul D., Nwabunma, Domasius, Krech, John E., Reuter, Donald F., Miling, Denis M., Harrison, James R.
• Primary Examiner(s): Feely; Michael J.
• Application Number:
  US10/672,581
• Publication Number:
  US 20040059035A1
• Time in Patent Office: 1,327 Days
• Field of Search: None
• US Class Current: 108/185
• CPC Class Codes: B65D 19/0012 forming a continuous plane contact surface
• CPC Class Codes: B65D 19/38 Details or accessories
• CPC Class Codes: B65D 2203/10 Transponders
• CPC Class Codes: B65D 2519/00034 Plastic
• CPC Class Codes: B65D 2519/00069 Plastic
• CPC Class Codes: B65D 2519/00104 Plastic
• CPC Class Codes: B65D 2519/00273 made of more than one piece
• CPC Class Codes: B65D 2519/00288 made of one piece
• CPC Class Codes: B65D 2519/00308 grid type, e.g. perforated plate
• CPC Class Codes: B65D 2519/00318 made of one piece
• CPC Class Codes: B65D 2519/00343 contact surface being substantially in the form of a panel
• CPC Class Codes: B65D 2519/00363 grid type, e.g. perforated plate
• CPC Class Codes: B65D 2519/00557 without separate auxiliary elements
• CPC Class Codes: B65D 2519/00562 chemical connection, e.g. glued, welded, sealed
• CPC Class Codes: B65D 2519/008 Drainage means
• CPC Class Codes: B65D 2519/0084 Separated elements, e.g. including in-moulded elements
• CPC Class Codes: B65D 2519/0086 Protection against environmental hazards, e.g. humidity, bacteria, fire
• CPC Class Codes: Y10S 108/901 Synthetic plastic industrial platform, e.g. pallet
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]

Abstract

A polymeric composition comprises a thermosetting resin and a polyolefin resin that cures to a semi-interpenetrating polymer network and is useful for producing plastic shipping and storage containers. The containers exhibit one or more friction surfaces, and can include fire resistance and other properties derived from property enhancing agents.

Claims

1. A method for producing a flame retardant-containing plastic shipping or storage container or one or more shaped parts thereof comprising the steps:

a) admixing a composition comprising

(1) one or more thermosetting resins and one or more curing agents therefore,

(2) a fully pre-polymerized uncrosslinked hydrocarbon polyolefin resin, and optionally a fully pre-polymerized uncrosslinked functionalized polyolefin, and

b) exposing said composition to curing conditions after forming the composition into a shipping or storage container or one or more shaped parts thereof, said shaped parts subsequently being secured together to form said shipping or storage container,

wherein said polymeric composition comprises

1 to 49 parts by weight of said curable thermosetting resin, the parts by weight being based on the total composition, and

51 to 99 parts by weight of a combination of at least one of said fully prepolymerized uncrosslinked hydrocarbon polyolefin resin and said fully prepolymerized uncrosslinked functionalized polyolefin resin, the parts by weight being based on the total composition, wherein said hydrocarbon polyolefin is present in the range of 25 to 99 parts by weight of the total composition and said functionalized polyolefin is present in the range of 0 to 50 parts by weight of the total composition, and

wherein said plastic container composition contains a flame retardant, said flame retardant being selected from the group consisting of non-halogenated flame retardants.

2. The method according to claim 1 wherein said composition comprises a foamed structure.

3. The method according to claim 1 wherein said plastic container further comprises one or more of performance enhancement additives selected from the group consisting of antimicrobial additives, mildewcides, foaming agens, fillers, and friction material on at least one surface thereof.

4. The method according to claim 3 wherein said performance enhancement additives are present in the range of more than 0 and up to 70 parts by weight of the weight of the total composition.

5. The method according to claim 3 wherein said plastic container comprises one or both of bubbles and glass beads as fillers.

6. The method according to claim 1 wherein said uncrosslinked prepolymerized polyolefin resin is selected from the group consisting of homopolymers, copolymers, blends with other polyolefins, blends with high impact polymers and blends with rubbers or elastomers.

7. The method according to claim 1 wherein said plastic container is a pallet.

8. The method according to claim 1 wherein said thermosetting resin is selected from the group consisting of epoxies, curable polyolefins, ethylene propylene rubber, ethylene butylene rubber, phenolics, polyurethanes, unsaturated polyesters, furan, allyls, vinyls, silicones, alkyds, nitrile rubber, mid functionalized rubber.

9. The method according to claim 1 wherein said thermosetting resin is an epoxy resin.

10. The method according to claim 1 wherein polyolefin resin is selected from the group consisting of alpha-olefins, copolymers of said alpha-olefins, and functionalized polyolefins wherein the functionalized groups include one or more of O, N, S, and P atoms.

11. The method according to claim 1 wherein said flame retardant is selected from the group consisting of ammonium phosphates, compounds containing phosphorus-nitrogen bonds, and cyclic phosphates.

12. The method according to claim 1 wherein said flame retardant in said composition is present in the range of more than 0 and up to 70 parts by weight of the total weight of the polymeric composition.

13. The method according to claim 12 wherein said flame retardant in said composition is present in the range of more than zero and up to and including 25 parts by weight of the total polymeric composition.

14. The method according to claim 1 wherein the resulting cured composition comprises an interpenetrating polymer network.

15. The method according to claim 1 wherein said plastic container further comprises friction material on at least one surface thereof.

16. The method according to claim 15 wherein said friction material adheres to said surface without the addition of an adhesive.

17. A method comprising the steps of

a) providing a molten mixture comprising a curable epoxy resin, a curative for the curable epoxy resin, said curative being stable at temperature of mixing, and at least one of a fully prepolymerized uncrosslinked hydrocarbon polyolefin resin and optionally a fully prepolymerized uncrosslinked functionalized polyolefin resin, and wherein said molten mixture contains a flame retardant said flame retardant being selected from the group consisting of non-halogenated flame retardants,

b) applying the mixture to a mold, and

c) at any subsequent time, activating the curative to produce a semi-interpenetrating polymer network,

wherein said application of said molten mixture to said mold is preceded by in-mold application of friction material.

18. The method according to claim 17 wherein said molten mixture further comprises one or more performance enhancement additives selected from the group consisting of antimicrobials, mildewcides, foaming agents, and fillers.

19. A method for producing a flame retardant-containing plastic shipping or storage container or one or more shaped parts thereof comprising the steps:

a) admixing a composition comprising

(1) one or more thermosetting resins and one or more curing agents therefore,

(2) a fully pre-polymerized uncrosslinked hydrocarbon polyolefin resin, and optionally a fully pre-polymerized uncrosslinked functionalized polyolefin, and

b) exposing said composition to curing conditions after forming the composition into a shipping or storage container or one or more shaped parts thereof, said shaped parts subsequently being secured together to form said plastic shipping or storage container,

wherein said plastic container composition contains a flame retardant, said flame retardant being selected from the group consisting of non-halogenated flame retardants, and wherein said plastic container further comprises one or more of radio frequency identification (RFID)-tags.

20. A method for producing a flame retardant-containing plastic pallet or one or more shaped parts thereof comprising the steps:

a) admixing a composition comprising

1) 1 to 49 parts by weight of one or more thermosetting resins and one or more curing agents therefore, the parts by weight being based on the total composition, and

2) 51 to 99 parts by weight of a combination of at least one of a fully pre-polymerized uncrosslinked hydrocarbon polyolefin resin and optionally a fully prepolymerized uncrosslinked functionalized polyolefin resin, the parts by weight being based on the total composition, wherein said hydrocarbon polyolefin is present in the range of 25 to 99 parts by weight of the total composition and said functionalized polyolefin is present in the range of 0 to 50 parts by weight of the total composition, and

b) exposing said composition to curing conditions after forming the composition into a plastic pallet or one or more shaped parts thereof,

wherein said plastic pallet or one or more shaped parts thereof contains a flame retardant, said flame retardant being selected from the group consisting of non-halogenated flame retardants.

21. The method according to claim 20 further comprising the step of securing together said shaped parts to produce said flame retardant-containing plastic pallet.