# US 5,348,794 A · Monoaxially oriented multilayered packaging material

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- Number: US 5,348,794 A
- Document ID: US5348794A
- Status: Granted
- Kind: A
- Application number: 08/110,492
- Filed: 1993-08-23
- Granted: 1994-09-20
- Earliest claimed: 1990-01-30
- Assignees: Nippon Petrochemicals Company, Limited
- Inventors: Tomonori Takahashi; Masato Kimura; Masataka Oka; Isamu Ogasawara
- Web page: https://patentgrep.com/patent/US5348794A

## CPC

- B29C 55/18: by squeezing between surfaces, e.g. rollers
- B29C 55/023: {using multilayered plates or sheets}
- B29C 55/04: uniaxial, e.g. oblique
- B32B 27/34: comprising polyamides
- B29K 2077/00: Use of {PA, i.e.} polyamides, e.g. polyesteramides {or derivatives thereof}, as moulding material
- B29K 2995/0026: Transparent
- Y10S 428/91: Product with molecular orientation
- Y10T 428/2495: Thickness [relative or absolute]
- Y10T 428/24967: Absolute thicknesses specified
- Y10T 428/31725: Of polyamide
- Y10T 428/31728: Next to second layer of polyamide
- Y10T 428/31736: Next to polyester
- Y10T 428/31743: Next to addition polymer from unsaturated monomer[s]
- Y10T 428/31746: Polymer of monoethylenically unsaturated hydrocarbon
- Y10T 428/3175: Next to addition polymer from unsaturated monomer[s]
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A multilayered packaging material having good piercing resistance and tearability and being excellent in appearance, transparency and so forth, can be produced by orienting multilayered structure which is composed of a polyamide resin layer and other thermoplastic resin layer(s) at a monoaxially stretching ratio of 1.5- to 7.0-fold in such a manner that the thickness of the polyamide resin layer is 3 to 30 .mu.m and the thickness(es) of the other thermoplastic resin layer(s) is (are) at least twice as much as that of the polyamide resin layer.

## Claims

### Claim 1

A monoaxially oriented multilayered packaging material obtained by the steps comprising passing a multilayered structure including one polyamide resin layer and another thermoplastic layer through at least one pair of rolls such that the ratio of the thickness of said structure before rolling to the thickness after rolling is 1.5:1 to 7.0:1, wherein the thickness of the polyamide resin layer is 3 to 30 .mu.m and the thickness of the other thermoplastic resin layer is at least twice that of the polyamide resin layer.

### Claim 2 (depends on 1)

The monoaxially oriented multilayered packaging material as claimed in claim 1 wherein said other thermoplastic resin layer is a layer formed of a thermoplastic selected from the group consisting of high density polyethylene, linear low density polyethylene, polypropylene, an ethylene-vinyl alcohol copolymer, polyvinylidene chloride, polyacrylonitrile, a polyester resin and polystyrene.

### Claim 3 (depends on 1, 2)

The monoaxially oriented multilayered packaging material as claimed claim 1 or claim 2 wherein a sealant layer having a melting point lower than the melting point of the resins of said multilayered structure is provided on either outside layer of the multilayered packaging material.

### Claim 4

A method of producing a monoaxially oriented multilayered packaging material which comprises passing a multilayered structure composed of a polyamide resin layer, another thermoplastic layer and a sealant layer in that order, the sealant layer having the lowest melting point of all component resins, through at lest one pair of rolls, which are heated to a temperature in the range of from below the melting point of the sealant layer resin to 70.degree. C. lower than the melting point of the sealant layer resin, such that the ratio of the thickness of said multilayered structure before rolling to its thickness after rolling is 1.5:1 to 7.0:1, wherein the thickness of the polyamide resin layer is 3 to 30 microns and the thickness of said another thermoplastic layer is at least twice that of the polyamide resin layer.

### Claim 5 (depends on 4)

The method as claimed in claim 4 wherein the surface roughness of the rolls used in said step of passing said multilayered structure through at least one pair of rolls is, in accordance with JIS B 0601, no greater than 1 s.

### Claim 6 (depends on 4, 5)

The method as claimed in claim 4 or claim 5 wherein said another thermoplastic layer is formed of a thermoplastic resin selected from the group consisting of high density polyethylene, linear low density polyethylene, polypropylene, polybutene-1, an ethylene-vinyl alcohol copolymer, polyvinylidene chloride, polyacrylonitrile, a polyester resin and polystyrene.