Peelable composite thermoplastic sealants in packaging films

Patent metadata

Field	Value
Publication number	US-9309027-B2
Application number	US-201313912887-A
Country	US
Kind code	B2
Filing date	Jun 7, 2013
Priority date	Nov 21, 2006
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A peelable sealing structure includes a sealing layer and one or more optional additional layers. The peelable sealing structure includes a sealing surface that is formable into a peelable seal upon contact with a sealing substrate at all temperatures in a peelable seal temperature range. Moreover, the peelable sealing structure comprises a thermoplastic polymer and an additive dispersed within at least a portion of the thermoplastic polymer with the peelable sealing structure defining the sealing surface.

First claim

What is claimed is:

1. A packaging system having a peelable seal section and a container section, the peelable seal section including a first sealing layer and a second sealing layer such that the first sealing layer contacts the second sealing layer to form a peelable seal, the first sealing layer and the second sealing layer each independently including:
a thermoplastic polymer; and
an organoclay dispersed within the thermoplastic polymer, wherein the first sealing layer and the second sealing layer have a seal initiation temperature from about 170° F. to about 350° F., the organoclay comprising platelets having an average separation of at least 20 angstroms.

2. The packaging system of claim 1 wherein the first sealing layer and the second sealing layer have a tensile modulus from about 500 to about 2000 MPa.

3. The packaging system of claim 1 wherein the first sealing layer has a sealing surface having a roughness average from about 1500 to about 5000 angstroms.

4. The packaging system of claim 1 wherein the first and second sealing layers are formable into the peelable seal at all temperatures within a peelable seal temperature range, the peelable seal temperature range being from the seal initiation temperature to a temperature that is at least 100° F. above the seal initiation temperature.

5. The packaging system of claim 1 wherein the organoclay comprises a plurality of particles having a spatial dimension less than 200 nm.

6. The packaging system of claim 1 wherein the platelets have an average separation of at least 30 angstroms.

7. The packaging system of claim 1 wherein the organoclay comprises a clay selected from the group consisting of organically modified kaolinite, montmorillonite-smectite clays, bentonite clays, illite clays, and combinations thereof.

8. The packaging system of claim 1 wherein the organoclay is present in an amount from 1 wt % to 20 wt % of the combined weight of the thermoplastic polymer and the organoclay.

9. The packaging system of claim 1 wherein the organoclay is present in an amount from 2 wt % to 10 wt % of the combined weight of the thermoplastic polymer and the organoclay.

10. The packaging system of claim 1 wherein the thermoplastic polymer further comprises a component selected from the group consisting of nylons, polyolefins, polystyrenes, polyesters, polycarbonates, copolymers of ethylene, copolymers of propylene, ethylene vinyl acetate, and mixtures thereof.

11. The packaging system of claim 1 wherein the thermoplastic polymer comprises a component selected from the group consisting of ethylene acrylic acid, ethylene ethyl acrylate, ethylene ionomers, and combinations thereof.

12. The packaging system of claim 1 wherein the thermoplastic polymer comprises ethylene vinyl acetate.

Assignees

• Intercontinental Great Brands Llc

Inventors

• Kinigakis Panagiotis
• Pokusa Kenneth
• Albaum Gary
• Jones Alexander
• Frederickson Eric

Classifications

• B29C65/76 Primary

  Making non-permanent or releasable joints · CPC title

• B29C66/929

  characterized by specific pressure, force, mechanical power or displacement values or ranges · CPC title

• B29K2105/0085

  Copolymers · CPC title

• C08K3/346

  Clay · CPC title

• Y10T428/24975

  No layer or component greater than 5 mils thick · CPC title