FR2460984A1 - PRESSURE-SENSITIVE ADHESIVE COMPOSITION AND ADHESIVE TAPE PREPARED WITH THE SAME - Google Patents

Abstract

THE INVENTION RELATES TO A PRESSURE SENSITIVE ADHESIVE COMPOSITION. THE COMPOSITION OF THE INVENTION INCLUDES 100PARTMENTS BY WEIGHT OF AN ELASTOMER, 5 TO 150PARTMENTS BY WEIGHT OF THICKENER, 0 TO 40PARTS OF ANOTHER POLYMER AND 0 TO 150PARTMENTS OF ADDITIVES. APPLICATIONS: ADHESIVE TAPES, ESPECIALLY FOR ATTACHING BOTTLES OF VEGETABLES OR FLOWERS.

Description

We have used until now to attach plants and other items

  adhesive tapes prepared by the following methods: (A) a pressure-sensitive adhesive is applied to one end of the surface of the carrier film and at the other end to the back of the carrier film. At the time of use for attaching products, the two ends overlap and the adhesives applied to the ends of the ribbon are glued together forming a bond

solid;-

  (B) a pressure-sensitive adhesive is applied over the entire surface of the release film and back of the film at regular intervals and at the time of use, the covering of the adhesives on both surfaces of the tape forms a strong bond; and (C) a pressure-sensitive adhesive is applied on

  both sides of all support films and, at the time of use,

  In this way, adhesives on both sides are glued together.

  However, the pressure-sensitive adhesives used on this type of adhesive tape exhibit a high degree of self-adhesiveness,

  that is, there is a strong connection between the surfaces on the

  which adhesives have been applied, but the tape does not adhere

on other types of surfaces.

  So for these types of adhesive tapes, adhesives

  applied to the surface for the connection are totally ineffi-

  cient. In the case of the tape on which adhesives are applied to

  extremities, as in the case (A) mentioned above, one must pre-

  Many different types of ribbons of different lengths can be used, these lengths vary according to the type of products to be fastened, as well as the volume of products to be tied into a bundle, but it is very complicated to prepare such varied ribbons. In addition, with this type of tape, the fixing method can not be implemented

  regularly with a machine to attach.

  In these adhesives having a high self-adhesive, the adhesive layers can be bonded to each other, but do not adhere to other products, such as the surfaces of the products to be attached. So, in the case of attaching vegetables, these are attached by fixing the ends of the adhesive layer of the

  ribbon, but the ribbon does not adhere to the vegetables.

  The ribbons can not be held in place on the outer surface of the vegetables and can often slip from their position and vegetables can fall off. Although it is thought that this method of attachment of vegetables would strongly prevent these accidents, this method has disadvantages, so that the vegetables are crushed or the ribbons can be cut when the vegetables are attached too strongly, the value commercial

  vegetables are then greatly reduced.

  The subject of the invention is an adhesive composition which

  the pressure which comprises 100 parts by weight of an elastomer, about 5 to 150 parts by weight of a thickener and 0 to 40 parts of another polymer and, if necessary, 0 to 150 parts by weight of additives . The composition has a suitable low adhesion to other substances and strongly adheres to itself, i.e. it has low adhesion and strong self-adhesion. For example, an adhesive tape whose adhesive is prepared from the composition mentioned above will adhere weakly on the product

  attached. In fact, the adhesion is so weak that the ribbon can easily

  It should be torn off without damaging the attached product. However, it gives a strong self-adhesion between the two ends of the tape wrapped around the product, so that it is a safe way to

tie products.

  The pressure-sensitive adhesive tape prepared from the above-mentioned composition is also part of

  the invention. The ribbon allows the implementation of a technique of

  staining by means of a fastening machine using the same ribbon with appropriate pressure irrespective of the size of the package to be attached. After fixing, the ribbon is slightly attached to the attached product such as vegetables, and the ends of the ribbon are tightly bound together. The ribbon can not slip during transport or handling of products. At the same time, the articles can not fall, and according to the invention there is obtained a secure means of attaching products. To detach products, the

  ribbon can easily be ripped off vegetables without damaging them.

  In addition, the ribbon of the invention is characterized in that, when the vegetables attached to the water are immersed in the water, the vegetables swell and become larger, the attachment does not come off, because of the good resistance to creep tape,

  deriving from the creep resistance of the adhesive composition.

  The subject of the invention is an adhesive composition which

  sible to pressure that has low adhesiveness and strong self-adhesiveness.

  The subject of the invention is also an adhesive composition

  Pressure sensitive seal having improved creep resistance.

  The subject of the invention is also an adhesive tape for

  attaching goods to one side of which the said

  sition. The invention also relates to an adhesive tape having a low adhesive power and a high self-adhesive power, prepared to

from said composition.

  The invention also relates to an adhesive tape for attaching vegetables and flowers, having improved creep resistance. Other features and advantages of the invention

  will appear on reading the following description with reference

  in the accompanying drawings, in which: - Figure 1 is a perspective view of the ribbon of the invention; - Figure 2 is a sectional view of the ribbon of Figure 1 along the line II-II; and

  FIG. 3 schematically represents the mode of use

ribbon of the invention.

  The invention relates to a pressure-sensitive adhesive composition which comprises as main components 100 parts in

  weight of an elastomer, about 5 to 150 parts by weight of a thick

  0 to 40 parts by weight of a polymer and, if necessary, 0 to about 150 parts by weight of additives, and which has a low adhesive power and a high self-adhesive capacity and, in addition, an adhesive tape

  pressure sensitive prepared from said composition.

  The tape shown in the accompanying drawings is described below. On one side of the support film 1, a layer of pressure-sensitive adhesive 2 having a low adhesive power and a high self-adhesive power is applied. Support material 1 a

  good resistance to water and, preferably, it can be

  Mee; a polypropylene, polyethylene, unplasticized PVC, polyester, etc. film is preferably used as the support material. The support film preferably has a thickness of about 20 to / u, but a film having a thickness outside this range may be used depending on the application for which it is intended. In addition, the commercial value of the ribbon is increased if the carrier film is classified according to the type of article to be attached or if

  the name of the place of production or the date of harvest, etc. are printed

on the ribbon.

  As seen from the foregoing, the ribbon of the invention is suitable for attaching various types of products and articles, particularly for leafy and root vegetables,

  flowers, etc. The ribbon is also suitable as a protective tape

  or packaging for various types of articles. However, the discus-

  following applies to a ribbon for attaching vegetables and flowers, but it should be borne in mind that ribbon

  also be used for another application mentioned above.

  The pressure-sensitive adhesive layer 2 having low tack and high self-adhesiveness, formed on the support film 1, exhibits an adhesion strength (i.e. by contact of the adhesive tape on a steel plate under a pressure of 2 kg / cm 2) of about 100 to 700 g / 20 mm

  wide and self-adhesive (ie, self-adhesive

  adhesive obtained after bonding together the adhesive faces of the pressure-sensitive adhesive tape) of more than 900 g / 20 mm wide. If the tape has too much adhesive power and if you use the tape to attach a soft vegetable such as spinach, the tape

  adheres strongly to said leaf vegetable and the vegetable is damaged

  magé, which lowers its commercial value when the ribbon is separated

vegetable.

  The elastomer used on the adhesive layer according to the invention is chosen from natural rubber, synthetic rubber such as butyl rubber (for example "Butyl No. 268" from Esso Standard Petroleum Co.), polyisoprene rubber and copolymer. sequenced such as block copolymer

  styrene-isoprene-styrene or styrene-butadiene-styrene.

  The composition of the pressure-sensitive adhesive layer

  sion still contains about 5 to 150 parts by weight of a thick-

  approximately 0 to 40 parts of a relatively low molecular weight polymer having good compatibility with the above elastomer and, if necessary, from 0 to 150 parts by weight of additives per 100 parts

by weight of the elastomer.

  For said polymer, polyisobutylene (weight

  about 7,000 to 20,000) and polybutene (molecular weight

about 1,000 to 10,000).

  As thickeners, the polyterpenes, the

  rosin esters and petroleum resins. Some of these

  are commercially available, eg polyterpenes

  having a softening point of 100C or more, the color resins

  phane and petroleum resins. In particular, the poly-

  terpenes such as "Quintone" A 100, D 100, D 200, C 100, C 200 S from Japan Geon Co., Ltd., alicyclic hydrocarbons such as

  that "Arcon" P 100, P 115, P 125 of the Arakawa Chemical Indus-

  try Co., Ltd., partially saturated hydrocarbon resins such as "Escorez" 5300 and 5320 of the Esso Chemical Co., Ltd., isoprene hydrocarbon resins such as "Escorez" 1304, 1310 and 1315 of the Company Esso Chemical Co., Ltd., unsaturated hydrocarbon resins such as Escorez 1202 from Esso Chemical Co., Ltd. and hydrocarbon resins such as "Tack-Ace" A 100 from Mitsui Petroleum Chemical Co., Ltd. These thickeners are used in varying amounts

  from about 5 to 150 parts by weight, alone or in combinations. The UTI

  thickener beyond this range lowers

  adhesiveness and creep resistance and exerts a detrimental influence

  on the ability of the ribbon to attach products.

  To the composition is added an additive to control

  convenient way cohesion and self-adhesiveness.

  For example, calcium carbonate, oxide

  zinc oxide, titanium oxide, vegetable oils or vegetable oils

  modified oils (castor oil, rapeseed oil, peanut oil and "Factice", etc.), paraffinic or aromatic processing oils (eg "Flexon" 765, 110, 112 and 876 from Esso Chemical Co .), polybutene, liquid polyisobutylene or polyterpenes having a softening point of 20 ° C or higher. When the additive is used in an amount of more than 150 parts by weight, the cohesion and self-adhesiveness are poorly balanced and cause initial poor tackiness leading to a strong instant bond that is not safe. Of these additives, those in the liquid state are used in an amount of 20 parts by weight or less to gain

to the balance of cohesion.

  The adhesive composition thus prepared is coated on one side of the support material, dried and rolled up

to prepare an adhesive tape.

  The adhesive composition is ordinarily applied at a thickness of about 5 to 30 / u when dry. Before coating, a primary treatment of the base film is preferably carried out according to a conventional technique, such as coating with a first layer, etc.

  The pressure-sensitive adhesive forms a weak layer

  adhesive composition having low polarity, but strong adhesiveness between the adhesive layers themselves. The adhesive tape therefore has the characteristic of low adhesiveness and strong self-adhesiveness

  which are very different from those of conventional rubber adhesives.

or acrylic.

  When the adhesive tape of the invention having a low adhesiveness and a high self-adhesiveness is used for fastening vegetables, a secure and stable bundle is obtained and this fastening is not released during handling and leaves do not slide the vegetables out of the package attached, but the ribbon does not damage the vegetables when it is torn off, because it does not adhere strongly on vegetables. Of

  ribbon only bears its adhesive layer on one side, the

  Mechanical staining can be done easily and effectively using a roll of tape, regardless of the size of the

  package to attach. Therefore, since it is not necessary to prepare

  In ribbon lengths, as is the case in the conventional method, the ribbon of the invention can be used to attach various types

  articles using only one type of ribbon, which is very effective.

and economic.

  When tape is used to attach vegetables or flowers, tape often slips or breaks when attached items swell, for example when vegetables or flowers are immersed in water or sprayed. to clean or refresh them. As a result, the ribbon must have good creep resistance under constant load, to withstand

  the increase in volume due to the absorption of water by the vegetable.

  In addition, in the case of attaching vegetable boots with the ribbon of the invention using a binding machine, a permanent instant bond must be produced between the adhesives on the ribbon to provide a strong bond resistant to the ribbon. dilation

vegetables.

  To quantitatively evaluate the physical properties

  adhesive tapes, the applicant uses several definitions of

  specific properties for these properties and the method of measuring these properties which are defined below and used throughout

this description.

  "Initial adhesive strength" is defined as follows: after contacting a smooth-edged surface of a metal rod 5 mm in diameter with the surface of the adhesive tape for 1 s under a load of 100 g to 20 C and 65% relative humidity, the initial adhesive strength is measured by the tear resistance obtained by tearing off the adhesive tape at a speed of 300 mm per minute

  (see ASTM Special Technical Publication No. 360).

  "Adhesive power" is defined as follows: after adhering under pressure the 20 mm wide adhesive tape on a stainless steel plate and bending at 1800 the free surface on the surface of the plate by means of of a cylinder weighing 2 kg, the adhesive power is obtained by the tear resistance obtained by tearing off the tape at a speed of 10 mm per second, see standard

Japanese JIS-S-1522.

  "Self-adhesion" is measured in the following manner after having the central parts of a length

  25 mm of a piece of tape 20 mm wide, and a length of

  approximately 15 cm without displacement and by adhering under pressure the adhesive parts with a roll of a weight of 1 kg, measuring the resistance obtained by tearing the non-stick end of the piece of tape at an angle of 1800 and at a speed of 3D0 mm / min. The 'self-adhesion preservation' is measured as follows: after joining together the adhesive faces of parts of a piece of adhesive tape 20 mm wide and 15 mm long in a length of approximately 25 mm without displacement, having fixed a free end of the pieces of tape, the resistance is measured by placing a load of a weight of 500 g at the other free end of the

  ribbon and left unchanged for 1 hour at 20 ° C and 65% humidity.

  relative extent and after measuring the pulling length, we compare

self-adhesive power.

  By measuring the properties of the ribbon of the invention by the method mentioned above, the results indicated are obtained.

  in Table I below. This property is measured to determine

  undermine the creep resistance of the ribbon of the invention.

  The corresponding properties are measured for some commercial ribbons, in particular for packaging ribbons. The

  The results obtained are shown in Table II below.

  The following examples illustrate the invention without any

limit its scope.

EXAMPLES 1 to 17

  To each of the components of the pressure-sensitive adhesive

  Mixed as shown in Table III below, a 1: 1 n-hexane-toluene solvent mixture was added at a concentration of the composition of 15%. The compositions are applied by the conventional technique to films desuppot and dried to obtain ribbons

  adhesives. The adhesive power, the

  adhesive and the initial adhesive power. The results obtained are

  shown in Table III below.

EXAMPLES 18 to 31

  On one side of a polypropylene film with a thickness of 40 u, the various adhesive compositions indicated are applied

  in Table IV below and dried to obtain adhesive tapes.

  Thicknesses having adhesive layers 20 / u thick. The properties of the ribbons are then measured. The results obtained are indicated in the

Table IV below.

EXAMPLE 32

  On a 25 μm thick polyester film, a composition shown in Table V below was applied and then dried to obtain an adhesive tape having an adhesive layer 25 μm thick. The properties of the ribbon obtained are indicated in the

Table V below.

EXAMPLE 33

  On an unplasticized PVC film, a

  adhesive listed in Table V below and dried for

  obtain an adhesive tape with an adhesive layer of 20 / u thick

  sor. Ribbon properties are shown in Table V below.

after.

EXAMPLE 34

  Adhesive tape is produced by applying the adhesive composition to a polypropylene film, as shown in FIG.

Table VI below.

  Using this ribbon, attach a bundle of epi

  nards weighing 250 g with a self-sticking length between ends of the tape of 17 imm. The bundle of spinach is immersed in the water and the length of the self-adhesive parts of the tape that separate over time is measured. The results obtained are indicated

in Table VI below.

  It is to be understood that the invention is not limited to the preferred embodiments described above by way of illustration and that those skilled in the art may make modifications thereto without

  it goes beyond the scope of the invention.

BOARD

  Initial adhesive strength (g / 5 mm diameter) 200 - 700 Adhesive power (g / 20 mm wide) 100 - 700 Self-adhesive power (g / 20 mm wide)> 900 Self-adhesive strength retention (mm / 500 gh) 0 - 7 o fe o co I

TABLE II

  Ribbon Type and Formulation Power Power Ability to Preserve Ability Power Conservation Adhesive Adhesive Adhesive Adhesive Adhesive Self-Adhesive (Parts) Initial (g / 20mm self adhesive adhesive (g / 5mm wide) (g / 20mm (mm / 500 gh) diameter) wide) (1) Polypropylene base film A. Natural rubber 50 clear 850 540 1.000 (22) SIS 50 colored 800 450 950 (16) Petroleum resin 85 B. Natural rubber 100 clear 1.100 720 1.000 (12) * Petroleum resin 90 colored 850 630 900 l C. Natural rubber 100 clear 830 710 1.250 (17) * Polyterpene 130 colored 840 650 1.250 (7) * Load 30 D. Natural rubber 100 colored 990 730 1.000 (12) * Polyterpene 90 Load 90 (2) Base film of fabric Regenerated rubber 100 colored 600 1.200 1.000 (130) * Resin rubber 50 Load 50 (3) Regenerated cellulose base film N Natural rubber 100 clear 700 600 ( 55) Resin rubber 85 colored 570 630 900 (19) = O Note: * load 200 g, ** load 300 g Jr w f w v

T A B L E A U III

  Example n 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Elastomer Butyl rubber 100 100 100 100 100 100 100 100 100, 100 100 100 50 75 80 Polyisoprene rubber 50 50 50 50 100 100 50 50 50 Natural Rubber 25 Polyisoprene Polymer Polybutene Polybutene Thinner 20 20 20 20 20 20 10 10 10 10 10 10 10 10 10 10 5 Resin of rosin ester Rosin Thickness (u) 54 55 56 57 59 58 58 57 59 60 60 59 59 59 58 60 60 Adhesive strength 400 490 500 570 640 580 610 230 550 510 480 550 650 610 540 340 660 (g / 24 mm wide) Self-adhesive power 1020 1140 1160 1160 1410 1450 1160 1930 1280 1160 1180 1260 1450 1250 1300 1200 1600 (g / 24 mm wide) Initial adhesive strength 420 450 510 510 560 530 530 400 510 470 510 520 550 520 420 340 540 (g / 5 mm in diameter) oo co

TABLE IV

  Example 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Elastomer SIS 100 100 100 90 90 90 100 100 100 100 100 100 100

SBS 10

NR 10

  Isobutylene 10 Butyl rubber 10 Thickener (50) (50) (50) (60) (60) (60) (60) (60) (60) (50) (80) (100) (30) (40) Polyterpene 60 Rosin ester 10 Petroleum resin 50 50 50 60 60 60 60 50 50 80 100 30 40 Additives (50) (50) (50) (60) (60) (60) (60) (50) (50) (50) ) (100) (120) (60) (0) CaCO3 50 10 60 Titanium oxide 50 Mineral or vegetable oil 50 50 50 50 40 40 30 80 120 tale or modified oil Polyterpene 10 10 10 10 10 10 10 10 10 Properties Adhesive power initial 600 500 500 300 700 500 700 700 700 600 510 410 700 300 (g / 5 mm in diameter) Pouvoiz Adhesive 600 650 700 500 600 550 500 600 600 600 440 520 650 650 (g / 20 mm wide) Self-power adhesive 2000 1600 1700 2000 1800 1800 1700 1800 2000 2000 2300 1850 2000 1500 (g / 20 mm wide) Power conservation OOOOOOOOOOOO 0 0,5 self-adhesive (mm / 500 gh) _ k- o co Co

BOARD. V

  Adhesive composition SIS Petroleum resin Polyterpene C & CO3 C co3 Titanium oxide Mineral or vegetable oil or modified oil

Example n

  Properties Adhesive initial power (g / 5 mm wide) 500 600 Adhesive power (g / 20 mm wide) 600 500 Self-adhesive power (g / 20 mm wide) 1600 1500 Self-adhesive strength retention OO (mm / 500 gh) F-. rd NO Co o oo

TABLE VI

  Composition SIS Elastomer 100 parts Thickener (Quintone A-100) 30 parts Polybutene Additive ("Dummy") 60 parts Removal of the bonded part after 70 min 0 after 120 min 0 after 220 min 0 after 17 h 6 mm n "IM CN or Co Co

Claims (13)

R E V E N D I C A T I 0 N S   1. A pressure-sensitive adhesive composition, characterized in that it comprises 100 parts by weight of an elastomer, 5 to 150 parts by weight of thickener, 0 to 40 parts of another polymer and 0 to 150 parts of additives.   2. Adhesive composition according to claim 1, characterized in that it has a low adhesive power and a strong self-adhesive power.   3. Adhesive composition according to claim 1, characterized   in that said elastomer is selected from natural rubber   rel., butyl rubber, polyisoprene rubber, copoly-   styrene-butadiene block mothers, styrene block copolymers isoprene and mixtures thereof.   4. Adhesive composition according to claim 1, characterized   in that said other polymer is selected from polyisoprene having a molecular weight of 7,000 to 20,000 and polybutene having   a molecular weight of 1,000 to 10,000.   5. Adhesive composition according to claim 1, characterized   in that the thickener is selected from polyterpene,   rosin esters, petroleum resins and mixtures thereof.   6. Adhesive composition according to claim 5, characterized   in that said petroleum resin is selected from the group consisting of   synthetic terpene, alicyclic resins, hydrocarbon resins,   hydrogenated bures, unsaturated hydrocarbon resins and isoprene-hydrocarbon resins.   Adhesive composition according to claim 1, characterized   in that said additives are selected from calcium carbonate, zinc oxide, titanium oxide> vegetable and mineral oils and modified oils, paraffinic oils or   aromatic processing oils and mixtures thereof.   8. Tape for attaching articles, characterized in that it comprises a coating of an adhesive composition according to the   claim 1 on an impervious support material.   9, tape according to claim 8, characterized in that said tape is particularly useful for binding boots of vegetables and flowers.   Adhesive tape according to claim 8, characterized in that said support material is selected from polyethylene films.   propylene, polyethylene films, polyvinyl chloride   unplasticized vinyl and polyester films.   An adhesive tape according to claim 8, characterized in that said adhesive layer is applied to the support material   at a dry thickness of 5 to 30 / u.   An adhesive tape according to claim 8, characterized in that said adhesive composition consists essentially of one or more elastomers selected from butyl rubber, rubber   of polyisoprene and natural rubber, one or more other poly-   selected from polyisoprene and polybutene, and one or more   thickeners selected from polyterpenes and rubbers of rosin esters.   An adhesive tape according to claim 8, characterized in that said elastomer is selected from styrene-isoprene block copolymers, styrene-butadiene block copolymers, natural rubber, isoprene rubber and butyl rubber and their mixtures.