FR2575411A1 - LAMINATE SUBSTRATE CONTAINING FLUORINATED POLYETHYLENE AND CONTAINING THE SAME - Google Patents

Abstract

SUBSTRATE 10 CONSTITUTES LAYERS OF MATERIALS INCLUDING LAYERS 11, 16 OF FLUORINE POLYETHYLENE BETWEEN WHICH ARE TAKEN IN SANDWICH A LAYER 13 OF METAL SHEET AND A LAYER 15 OF PAPER, ALL GLUED TO ONE TO THE OTHERS IN A APPROPRIATE MANNER. APPLICATION IN THE MANUFACTURE OF TUBES FOR TOOTHPASTE.

Description

The present invention relates, in a manner

  generally, the technique of containers and, more

  firstly, a crushable dispensing container whose

  wall is laminated in the body part of this-

  by which the penetration and absorption of the product and the absorption of oxygen are largely avoided in all regions of the structure of the body.

container that are sensitive to it.

  Crushing tubes made of metal

  Plastics and plastics have long been known in the field of packaging. The extruded metal tubes are

  intrinsically brittle, and their repeated use

  frequently causes cracks in the wall, so that the product exudes from a location other than the

  virtually rigid distribution. Of the metal tubes

  in the prior art, aluminum tubes,

  although probably the least brittle, have

  quite limited, because until now it has not been possible to apply a completely satisfactory

  necessary to prevent attack and corrosion of the

  alkaline or acidic contents and the contamina-

  content by the products of the reaction. Despite the relatively brittle nature of the metal tubes, the mentioned internal coating operation requires a

  additional stage of treatment which necessarily increases

the cost of the final article.

  Formed tubes of polyethylene and other plastics have had great commercial success in the packaging of many products. However, it was noted that some other products were deteriorating

  after a while when they were contained.

  Plastics such as polyethylene are permeable to some extent when used in

  wall thicknesses used in tubular containers

  and essential oils contained in the majority of

  dentifrices to perfume them see their volume

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LLSILS

  Brandt (U.S. Patent No. 3,295,725) has developed a tube that combines the above advantages of aluminum tubing with the advantages of tubing material.

  plastic. It is an empty dispensing container

  laminate sand containing both a barrier

  and a polyethylene inner wall. The thermoplastic layer is described, in general,

  as a polyolefin and a copolymer of an

  and a monomer containing polar groups which

  is copolymerizable therewith. This laminate is

  the limitations described above, except for the absorption of essential oils from toothpastes. Marchak (Canadian Patent No. 728,525) has developed

  also a laminate tube containing a layer

  dull polyethylene. He acknowledged the problem of

  odoriferous oil sorption by the thermoplastic wall

  than. Other inventors have studied polymers

  surface treated in their manufactured products.

  D'Angelo (U.S. Patent No. 4,142,032), in his study on dandruff and containers, noted that

  barrier properties are improved by

  surface with fluorine and bromine. However, he did not make a tube; his article did not contain aluminum, and he did not recognize the properties of

  barrier of this polymer for aromas.

  Boultinghouse (U.S. Patent No. 4,229,226.

  151), Gilmour (US-A-4,110,518), Dixon (US Patent No. 4,020,223), Scotland (US Patent No. 3,647,613) and Anand (US Patent No. 4,404,256), disclosed, they, too, manufactured products involving polymers surface-treated with fluorine. Boultinghouse

  demonstrated that the treatment made the surfaces recei-

  adhesives, coatings, paints, inks, deco-

  rations, etc., Gilmour showed that the surface behaves like

  te as an electrical insulator, Dixon's treatment

257541.1

  conferred characteristics of ability to eliminate oil stains; Scotland's treatment brought

  solvent resistance. None of these products,

  during, was a tube; none of them contained a layer of aluminum; and none of the inventors noted the

  aroma resistance of these articles.

  An important object of the present invention is therefore to provide a crushable dispensing container

  laminated wall in the body part.

  Another object of the invention is to provide a

  tubular container having a plurality of adhesive layers

  in one of these layers constituting a barrier to product migration and oxygen uptake, such as a metal foil, and another of these being a fluorinated polyethylene

  or a mixture based on it, density and crys-

  variable tallinity. This last layer being the innermost and preferably the outermost, with various

  additional layers sandwiched together.

  These additional layers comprise of

  pier and an appropriate adhesive, and liaison officers

  such as a copolymer of ethylene and acrylic acid

than.

  The crushable dispensing container of the pre-

  This invention can be made from the laminate substrate of the present invention by conventional and known apparatus. Examples of this apparatus and method are found in U.S. Patent No. 3,832,964, which is hereby incorporated herein by reference.

of reference.

  It is another object of the present invention to provide a method of manufacturing laminated tubes in which a tubular body is formed of a barrier layer and a fluorinated polyethylene laminated thereon; the laminated tube is then placed on

  a shaping element against a bar-forming element

  also placed on this one.

  The invention will be better understood on reading

  description which will follow, given only to

  For example, and with reference to the accompanying drawings.

  In the drawings, in which like reference numerals are used to denote like parts: Figure 1 is a cross-sectional view of a

  fragment of a layered substrate of the present invention.

  2 is a side elevational view of a crushable dispensing container embodying the novel concepts of this invention, parts of the body walls being cut away to more fully illustrate

the stratified structure.

  The thermoplastic material of the present invention

  The invention is a fluorinated polyethylene.

  In Figure 1 of the drawings, a substrate 10 is shown in cross-section, thereby revealing the

  constituents of the sandwich that forms the strati-

fied.

  It can be seen that the lower layer 11 is a fluorinated polyethylene. The second layer 12 above it is an adhesive layer which connects the fluorinated polyethylene layer 11 to the third layer 13 which is

  a metal sheet such as aluminum foil.

  The fourth layer 14 is another adhesive which adheres the other side of the foil layer 13 to a paper layer 15. The top layer 16 is

fluorinated polyethylene.

  Fluorinated polyethylenes are particularly

  useful because they have very low absorption characteristics of aromas, as can be seen from

  following tables, in which fluorescent polyethylenes

  res are compared with polyethylene, the thicknesses of the layers or coating being the same:

TABLE I

RELATIVE ABSORPTION OF AROMA BY

  POLYMERS FROM SCENTED DYES!

22.2 C 32.2 C 48.9 C

  Aluminum 0.4 0 0.4 High Density Surface-Directed Polyethylene HD-3 Fluorine (Air Products) 22 37 90 High-Density Polyethylene HD-O (Air Products) 98 94 100 Low Density Polyethylene LD-O (Air Products) 100 94 111 * All numbers refer to low density polyethylene at 22.2 C, arbitrarily set as 100; the smaller the number, the less the quantity

absorbed aroma is important.

TABLE IIl

ABSORPTION BY POLYMERS

ODORIFEROUS OIL NOT DILUTED

Absorption (%) Aluminum O

  Polyethylene HD-3 high density treated

  Fluoride Surface Tee (Air Products) 3.3 High Density Polyethylene HD-O (Air Products) 4.8 Low Density Polyethylene LD-O (Air Products) 7, 9 Low Density Polyethylene NA

(USI) - 10.0

  Surlyn 1707 Ionomer (DuPont) 15.7 Surlyn Ionomer 1605 (DuPont) 19.0

2.575411

Surlyn 1706 Ionomer (DuPont) 24.3

-TABLE III

ABSORPTION BY POLYMERS

ODORIFEROUS OIL NOT DILUTED

  % of absorbed aroma N 74 Low density polyethylene surface-treated with fluorine (a) 2.6 N 76 Low-density polyethylene surface-treated with fluorine (a) 2.6 Low-density polyethylene (b) 5.5 Low polyethylene density (control) (a) 5, .6 O, 14 (e) lonomer (c) 7.4 ionomer (d) 12.2 a) low density polyethylene is Lupolen

1804H (BASF),

  b) Tenite 154 (Eastman), c) Surlyn 8940 (DuPont), d) Surlyn 8920 (DuPont),

e) n = 3.

TABLE IV

LOSS OF AROMA OF A TOOTHPASTE

  PERFUMED IN POLYMERS LOSS OF AROMAS N076 Low density polyethylene surface-treated with fluorine (a) 56

  N 74 Low density polyethylene -

  surface treated with fluorine (a) 64 Ionomer (b) 88 Ionomer (C) 96 Low density polyethylene (control) (a) 100 Low density polyethylene (d) 136 * Compared to BASF low density polyethylene control arbitrarily set as equal to 100; the lower the number, the less the amount of aroma

  lost by toothpaste is important.

  a) Low density polyethylene is Lupolen

1804H (BASF),

  b) Surlyn 8920 (DuPont), c) Surlyn 8940 (DuPont),

(d) Title 154 (Eastman).

  It is envisaged that in the context of

  adhesives may be a copolymer of ethyl-

  lene and acrylic acid or methacrylic acid,

  or the sodium or zinc salts thereof in a system

diluents.

  The metal sheet may be preferably

an aluminum foil.

  The paper layer is advantageously a

kraft pier.

  The thickness range of each of the

  is advantageously the following: fluorinated polyethylene layer 11: 12, 7 microns to

  76.2 microns (0.5 to 3.0 thousandths of an inch), preferably

  that's 24.4 microns (1.0 thousandth of an inch),

  adhesive layer 12: sufficient to ensure adhesion

  number of sheets of metal foil 13: 12.7 microns

  , 8 microns (0.5 to 2.0 thousandths of an inch), preferably

  that 25.4 microns (1.0 thousandth of an inch),

  adhesive layer 14: sufficient to ensure adhesion

  paper layer: 38.1 microns to 63.5 microns

  (1.5 to 2.5 thousandths of an inch), preferably 50.8

  crons (2.0 thousandths of an inch), fluorinated polyethylene layer 16: 88.9 micron

  127 microns (3.5 to 5.0 thousandths of an inch), preferably

  101.6 microns (4.0 thousandths of an inch).

  The upper fluorinated polyethylene layer 16 is adhered to the paper layer 15 by application

  to the substrate of sufficient heat and pressure. Lors-

  that the application of heat and pressure is inappropriate

  required, an appropriate adhesive should be used.

  Figure 2 is an example of the structure

  layer of a crushable container in which the

  are designated as in Figure 1, layer 11

  being the innermost and the other layers being

  killed from the same materials and being placed in the same

order than indicated.

  It is apparent from the foregoing that the Applicant has provided a container structure

  collapse which significantly reduces the problems that are not

  read until now by the prior art. The substrate

  laminate and the laminated shoulder piece

  practically override product penetration and

oxygen sorption.

  The outer layer of fluorinated polyethylene is a thermoplastic material capable of melting during a lateral welding operation and ensuring

  adequate protection for paper and the intermediate layer

  re sheet metal. The technique of

  welding a tube of crushable toothpaste of the general type

  here described in U.S. Patent No. 3,295,725,

  incorporated herein by reference. How-

  the outer layer of fluorinated polyethylene and

  pier can be removed if the barrier leaf

  is thick enough to resist damage

  by pouring a thermoplastic material

  in the lateral seam overlap during the sealing

  when using such a system.

  In addition, the inner layer may be a

  pier in a 3-layer laminate formed of paper, foil and fluorinated polyethylene as described. As the outermost and innermost layers are preferably the same, the. folded edges of the tube produced from the substrate are conveniently

  linked by heat. An appropriate adhesive may be used

  when heat bonding is not possible.

  corn. This variant is in addition to the laminate & 4 layers mentioned above, consisting, from the outside to the inside, of fluorinated polyethylene, paper,

  of a metal foil and fluorinated polyethylene.

  It is envisaged to use if necessary

  be the layers of the appropriate adhesives. Fluorinated polyethylene can also be used, if desired, for shoulder pieces, plugs, necks,

  pistons and in the manufacture of distribution valves

  for other toothpaste distributors, in par-

  especially in the interior parts exposed to

  content, which will naturally be used here

  re, if necessary, compatible adhesives.

  In addition, when cast in form

  of film on the internal faces of barrels against

  plated used for the storage of scented toothpaste, the material will delay the loss of aroma in the barrels,

  thus prolonging the storage period.

Claims (6)

  A substrate composed of layers of material, characterized in that it comprises a first layer (11) of a fluorinated polyethylene, a second layer (13) of metal foil, a third layer of paper (15) and a fourth layer (16) a fluorinated polyethylene. Substrate according to claim 1,   characterized in that the first polyethylene layer   fluorinated lene is fixed on the metal foil with an adhesive.   3. Substrate according to claim 1, characterized in that the third layer of paper is attached to the fourth layer of polyethylene fluorinated with an adhesive.   4. Substrate according to claim 1,   characterized in that the first polyethylene layer   fluorinated lene is fixed to the metal foil with an adhesive and in that the third layer of paper   is fixed on the fourth layer of the fluent polyethylene adorned with an adhesive.   Substrate according to claim 4,   characterized in that the adhesive is a copolymer of thylene and acrylic acid.   6. crushable container dispensing dough, characterized in that it is formed using a substrate   as claimed in any of the claims previous cations.