Synthetic liner capable of resisting chemical attack and high temperature

• US 4,818,577 A
• Filed: 08/20/1987
• Issued: 04/04/1989
• Est. Priority Date: 08/20/1987
• Status: Expired due to Term

• Current Assignee: Selig Sealing Products Incorporated (Henry Crown & Co.)
• Original Assignee: 3M Company
• Inventors: Ou-Yang, Daivd T.
• Primary Examiner(s): Robinson, Ellis P.
• Assistant Examiner(s): Seidleck, James J.
• Application Number:
  US07/087,666
• Time in Patent Office: 593 Days
• Field of Search: 428/35, 428/318.4, 428/317.1, 428/319.7, 428/319.3, 428/319.9, 428/319.1, 428/347, 428/349, 428/317.7, 428/422, 428/220, 428/473.5, 428/447, 428/480 , 428/521, 428/483, 428/215, 215/347, 215/348, 215/349
• US Class Current: 428/36.5
• CPC Class Codes: B32B 2266/025 Polyolefin vinyl or acrylic copolymers B32B2266/0221, B32B2266/0242
• CPC Class Codes: B32B 2307/306 Resistant to heat
• CPC Class Codes: B32B 2307/7242 Non-permeable
• CPC Class Codes: B32B 2327/18 PTFE, i.e. polytetrafluoroethylene
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: B32B 2379/08 Polyimides
• CPC Class Codes: B32B 2383/00 Polysiloxanes
• CPC Class Codes: B32B 2435/02 for containers
• CPC Class Codes: B32B 2439/70 Food packaging
• CPC Class Codes: B32B 2439/80 Medical packaging
• CPC Class Codes: B32B 27/065 of foam
• CPC Class Codes: B32B 27/281 comprising polyimides
• CPC Class Codes: B32B 27/283 comprising polysiloxanes
• CPC Class Codes: B32B 27/322 comprising halogenated polyolefins, e.g. PTFE
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: B32B 5/18 characterised by features of a layer of foamed material
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: B65D 2251/0015 of the 41-type
• CPC Class Codes: B65D 2251/0093 Membrane
• CPC Class Codes: B65D 2251/205 Inserted
• CPC Class Codes: B65D 41/045 : Discs B65D41/0457 takes precedence
• CPC Class Codes: B65D 51/20 : Caps, lids, or covers co-operating with an inner closure arranged to be opened by piercing, cutting, or tearing B65D51/185 takes precedence; co-operating with an auxiliary container for additional articles or materials B65D51/28
• CPC Class Codes: Y10T 428/1376 : Foam or porous material containing
• CPC Class Codes: Y10T 428/24967 : Absolute thicknesses specified
• CPC Class Codes: Y10T 428/249982 : With component specified as adhesive or bonding agent
• CPC Class Codes: Y10T 428/249985 : Composition of adhesive or bonding component specified
• CPC Class Codes: Y10T 428/24999 : Inorganic
• CPC Class Codes: Y10T 428/249991 : Synthetic resin or natural rubbers
• CPC Class Codes: Y10T 428/31544 : Addition polymer is perhalogenated
• CPC Class Codes: Y10T 428/31663 : As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31721 : Of polyimide
• CPC Class Codes: Y10T 428/31786 : Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31826 : Of natural rubber
• CPC Class Codes: Y10T 428/31931 : Polyene monomer-containing

Abstract

A liner, suitable for use with caps for containers, comprising a layer of compressible polymeric foam, a layer of adhesive in contact with and coextensive with said foam layer, and a layer of polymeric film in contact with and coextensive with said layer of adhesive.

The liner shows good chemical resistance, good resistance to high temperatures, and good impermeability to gases.

Claims

1. Liner suitable for a cap for a container consisting of:

(a) a layer of compressible polymeric foam, said layer of foam comprising a polymer or copolymer of olefin,

(b) a layer of adhesive in contact with and coextensive with said layer of foam, and

(c) a layer of polymeric film in contact with and coextensive with said layer of adhesive, said layer of film being made of a material selected from the group consisting of crystalline and semicrystalline polyesters, silicones, polytetrafluoroethylenes, and polyimides.

2. The liner of claim 1 wherein said layer of polymeric foam has a thickness ranging from about 2 mil to about 60 mil.

3. The liner of claim 1 wherein said layer of polymeric foam is sufficiently compressible that said liner having dimensions of 38 mm and a thickness of 45 mils can recover at least 30% when a force of 20 in.-lb. of torque is applied to said cap and said container for one minute.

4. The liner of claim 1 wherein said polymeric foam is an open cell foam.

5. The liner of claim 1 wherein said layer of polymeric film has a thickness ranging from about 0.2 mil to about 5 mils.

6. The liner of claim 1 wherein said layer of polymeric film is comprised of polymeric material having a melting point of at least 130°

C.

7. The liner of claim 1 wherein said layer of polymeric film has an oxygen transmission rate not in excess of 60 cc/100 sq. in./day.

8. The liner of claim 1 wherein said layer of adhesive comprises a pressure-sensitive adhesive.

9. The liner of claim 1 wherein said layer of adhesive comprises a polyolefin-based adhesive.

10. The liner of claim 1 wherein said layer of adhesive comprises a rubber-based adhesive.

11. The liner of claim 1 wherein said layer of adhesive comprises an acrylic polymer-based adhesive.

12. A cap for a container, said cap having the liner of claim 1 inserted therein.

13. A container having a cap, said cap having the liner of claim 1 inserted therein.

14. The liner of claim 1 in the shape of a disc.