# US 10,865,028 B2 · Heat sealable, retortable laminated foil

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- Number: US 10,865,028 B2
- Document ID: US10865028B2
- Status: Granted
- Kind: B2
- Application number: 13/274,100
- Filed: 2011-10-14
- Published: 2012-06-14
- Granted: 2020-12-15
- Earliest claimed: 2005-02-14
- Assignees: Mentcon Singapore Pte Ltd.
- Applicants: Kong Mun Chew
- Inventors: Kong Mun Chew
- Web page: https://patentgrep.com/patent/US10865028B2

## CPC

- B65D 75/5855: {Peelable seals}
- B32B 15/08: of synthetic resin
- B32B 15/20: comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)}
- B32B 27/08: of synthetic resin
- B32B 27/10: of paper or cardboard
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/322: {comprising halogenated polyolefins, e.g. PTFE}
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- B32B 27/40: comprising polyurethanes
- B32B 29/002: {as the main or only constituent of a layer, which is next to another layer of the same or of a different material (next to a layer of a particular substance B32B9/06; next to a bituminous or tarry layer B32B11/06; next to a water-setting substance layer B32B13/08; next to a metal layer B32B15/12; next to a glass layer B32B17/065; next to a layer formed of natural mineral fibres or particles B32B19/046; next to a wood layer B32B21/06; next to a cellulosic plastic layer B32B23/06; next to a natural or synthetic rubber layer B32B25/06; next to a synthetic resin layer B32B27/10)}
- B32B 2307/31: Heat sealable
- B32B 2439/40: Closed containers
- B65D 85/38: for delicate optical, measuring, calculating or control apparatus
- B65D 2575/586: with means for reclosing
- B65D 2585/545: Contact lenses
- Y10T 428/264: Up to 3 mils
- Y10T 428/265: 1 mil or less
- Y10T 428/2826: Synthetic resin or polymer
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A heat sealable, retortable laminated foil capable of being heat sealed to itself or to a polypropylene substrate in forming a contact lens package includes an outer polymeric barrier layer, an intermediate barrier layer, an inner polymeric barrier layer, and a heat sealable layer.

## Claims

### Claim 1

A heat sealable, autoclavable laminated foil configured to be heat sealed to itself or to a polypropylene substrate, wherein the foil comprises:
i. an outer polymeric vapor barrier layer wherein the polymeric layer is a bi-axially drawn polyester film with a thickness of approximately 12 microns;
ii. an intermediate vapor barrier layer formed of slow rolled aluminum having a thickness of less than 30 microns;
iii. an inner polymeric vapor barrier layer wherein the inner polymeric vapor barrier layer is a bi-axially drawn polyester film with a thickness of approximately 12 microns; and
iv. a heat sealable layer wherein the heat sealable layer is a melt cast polyolefin copolymer film with a minimum melting point of 130 degrees Celsius;
wherein a seal strength of said foil when heat sealed to itself is less than 20N/15mm after autoclaving.

### Claim 2 (depends on 1)

The laminated foil of claim 1 wherein the maximum water vapor transmission rate of said foil is 10 g/m2 per 24 hr at 40° C. and 90% relative humidity.

### Claim 3 (depends on 2)

The laminated foil of claim 2 wherein the heat sealable layer further comprises an inorganic filler.

### Claim 4 (depends on 2)

The laminated foil of claim 2, wherein the inorganic filler comprises talc.

### Claim 5 (depends on 1)

The laminated foil of claim 1 wherein each layer is separated by a dry laminate layer.

### Claim 6

A sealed primary contact lens package configured for storing a contact lens for a period in time in excess of two years, the package comprising:
a bottom layer;
a top layer sealed to said bottom layer, said top layer and said bottom layer being sealed together to define a storage space; and
a contact lens and hydrating solution disposed in said storage space;
wherein said top layer is a heat sealable, retortable laminated foil configured to be heat sealed to itself or to a polypropylene substrate, wherein the foil comprises:
i. an outer polymeric vapor barrier layer wherein the outer polymeric vapor barrier layer is a bi-axially drawn polyester film with a thickness of approximately 12 micron;
ii. an intermediate vapor barrier layer formed of slow rolled aluminum having a thickness of less than 30 micron;
iii. an inner polymeric vapor barrier layer wherein the inner polymeric vapor barrier layer is a bi-axially drawn polyester film with a thickness of approximately 12 micron; and
iv. a heat sealable layer wherein the heat sealable layer is a melt cast polyolefin copolymer film with a minimum melting point of 130° Celsius;
wherein heat sealing the foil to itself or a polypropylene substrate provides a peelable seal, with a heat seal strength less than 20N/15 mm.

### Claim 7 (depends on 6)

The contact lens package of claim 6, wherein the water vapor transmission rate of said laminated foil is less than 10 g/m2 per 24 hr at 40° C. and 90% relative humidity.

### Claim 8 (depends on 7)

The contact lens package of claim 7 wherein the heat sealable layer of said laminated foil further comprises an inorganic filler.

### Claim 9 (depends on 8)

The contact lens package of claim 8, wherein inorganic filler comprises talc.

### Claim 10 (depends on 6)

The contact lens package of claim 6, wherein said top layer and said bottom layer are each formed of a heat sealable, autoclavable laminated foil configured to be heat sealed to itself or to a polypropylene substrate, wherein the foil comprises:
i. an outer polymeric vapor barrier layer, wherein the outer polymeric vapor barrier layer is a bi-axially drawn polyester film with a thickness of approximately 12 micron;
ii. an intermediate vapor barrier layer formed of slow rolled aluminum having a thickness of less than 30 micron;
iii. an inner polymeric vapor barrier layer, wherein the inner polymeric vapor barrier layer is a bi-axially drawn polyester film with a thickness of approximately 12 micron; and
iv. a heat sealable layer;
wherein said contact lens package is configured to be sterilized using autoclave sterilization.