WO1998008910A1 - Colle a teneur en lecithine - Google Patents

Colle a teneur en lecithine Download PDF

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Publication number
WO1998008910A1
WO1998008910A1 PCT/CH1997/000313 CH9700313W WO9808910A1 WO 1998008910 A1 WO1998008910 A1 WO 1998008910A1 CH 9700313 W CH9700313 W CH 9700313W WO 9808910 A1 WO9808910 A1 WO 9808910A1
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WO
WIPO (PCT)
Prior art keywords
adhesive
lecithin
acid
weight
substrate surfaces
Prior art date
Application number
PCT/CH1997/000313
Other languages
German (de)
English (en)
Inventor
Emil Simmler
Thomas Simmler
Original Assignee
Alfa Klebstoffe Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alfa Klebstoffe Ag filed Critical Alfa Klebstoffe Ag
Priority to AU38455/97A priority Critical patent/AU3845597A/en
Priority to DE19780894T priority patent/DE19780894D2/de
Publication of WO1998008910A1 publication Critical patent/WO1998008910A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic

Definitions

  • the invention relates to a lecithin-containing adhesive for application to one or both of two substrate surfaces to be bonded.
  • the invention further relates to a method for connecting two substrate surfaces, at least one of which is water-permeable, to the adhesive and to the use of such an adhesive.
  • JP, A 53072061 describes a lecithin-containing adhesive with an organic solvent for joining polyethylene films.
  • the adhesive contains 100 parts of chlorinated or cyclized rubber and less than 100 parts of lecithin. This mixture is intended to optimize the adhesion between polyethylene films. For example, two polyethylene films are bonded together by, after applying a mixture of 100 parts of cyclized rubber, 40 parts of lecithin, 60 parts of a fatty acid wax, 14 parts of a polyethylene wax, 8 parts
  • the peel strength is 0.1 kg / cm 2 compared to 0.23 kg / cm 2 with a similar adhesive without lecithin.
  • JP, A 54002285 describes a further lecithin-containing adhesive composition with an organic solvent.
  • the adhesive comprises a cellulose derivative dissolved in an organic solvent and a phosphatide and at least one substance from the group consisting of deethylsiloxane, low molecular weight polyethylene, inorganic filler and pigment.
  • This adhesive allows substrates to be easily detached, for example 12 parts of ethyl cellulose, 2 parts of lecithin, 1 part of dimethylsiloxane, 1 part of low molecular weight polyethylene, 60 parts of PhMe and 24 parts of EtOAc were stirred at a viscosity of 1 P for 20 min.
  • the lecithin-containing adhesive with organic solvent is applied to a paper web, which is used, for example, for the production of milk cartons, dried at 50 ° and pressed at 220 ° and 5 kg / cm2 for 10 seconds.
  • the peel force is 0.15 kg / 15 mm, compared to 0.25 kg / 15 mm when using aetylene cellulose as an adhesive.
  • Aqueous polymer dispersions are prepared, for example, by polymerizing an onomeric mixture of vinyl acetate and copolymers of vinyl acetate with at least one type of copolymerizable monomers such as ethylene, acrylic acid and its esters, metacrylic acid and its esters, 2-hydroxyethyl acrylate, etc.
  • a 34231 discloses self-adhesive components based on acrylic ester and vinyl acetate polymers. Preferably 0.3 to 15% by weight of lecithin are applied to various carriers and covered with a peelable self-adhesive film. Numerous details are given for two variants, an aqueous solvent is neither mentioned nor hinted at.
  • the present invention has for its object to provide an adhesive of the type mentioned, which allows the connection of two substrate surfaces with a high enough initial adhesion for all processing and a later easy, surface-independent separation of the two substrate surfaces, complete for ecological and workplace hygiene reasons organic solvents should be avoided.
  • an aqueous dispersion of a base adhesive with high initial adhesion contains at least about 30% by weight of mixed in lecithin, based on the solids content.
  • Lecithin belongs to the group of phospholipids, in which phosphoric acid is esterified on the one hand with choline and on the other hand with glycerol. If the two free hydroxyl groups of the basic glycerol are esterified with long-chain fatty acids, lecithins (phosphatidylcholines) of the general formula according to FIG. 1 are obtained.
  • the ⁇ configuration shown in FIG. 1 predominantly or almost exclusively occurs in nature.
  • the secondary (middle) hydroxyl group is esterified with the phosphoric acid choline residue.
  • Soybean lecithins the most important vegetable raw material before rape and sunflowers, contain, for example, residues R ', R "of palmitic acid, stearic acid, palmitoleic acid, oleic acid, linoleic acid and linolenic acid.
  • residues R ', R "of palmitic acid, stearic acid, palmitoleic acid, oleic acid, linoleic acid and linolenic acid Normally, the primary hydroxyl group with a saturated fatty acid is the secondary hydroxyl group (the middle one ) the glycerol is esterified with an unsaturated fatty acid
  • the plant-based lecithins also contain structurally related additives, in particular cephalins.
  • Lecithins are a hygroscopic, waxy mass, which in the case of lecithins obtained from plants soon takes on a brownish-yellow color in the air.
  • the decomposition temperature is around 200 ° C.
  • Lecithins are easily soluble in ether and often also in alcohol. Lecithins are insoluble in water, but can be dispersed in them.
  • Lecithins are primarily known as emulsifiers, mainly in the food industry. Lecithins are also used as defoamers or preservatives.
  • lecithin is mixed into a base adhesive.
  • the characteristic effects according to the present invention do not occur or only inadequately.
  • Lecithin is mixed into an aqueous dispersion adhesive in a manner known per se, in this sense it works
  • Lecithin is not the actual adhesion promoter. Rather, the main effect of lecithin is after to reduce the cohesion of the adhesive applied between two substrates considerably in a relatively short time.
  • the adhesive force adheresive layer - substrate surface
  • the adhesive layer becomes inherent so separated that parts of it remain on both substrate surfaces.
  • This has the advantage that there is always a separation that is only dependent on the applied adhesive. This is not the case in the event of an adhesion break, where at least one substrate surface plays a decisive role. According to the present invention, however, an adhesion breakage can also occur if the adhesive layer adheres only slightly to a substrate surface.
  • Soybean lecithins are preferably bleached because of the discoloration, for example by adding about 30% H-0 and then stirring at about 60 ° C. for about 5 hours.
  • the substrate surfaces would be unsightly after using a non-bleached lecithin after a cohesive break.
  • Lecithin as a white mass which cannot be discolored by light can also be prepared by synthetic processes known to the person skilled in the art. Synthetic lecithin, like that obtained from plants, is available on the market.
  • the usual additives are expediently mixed in with the base adhesive, in addition to lecithin, for example 0.1 to 2% by weight of preservative, 0.2 " to 1% by weight of defoamer and / or 0, 5 to 5 wt .-% compatibility agent, the weight percent as always based on the solids content.
  • an aqueous base adhesive dispersion can consist of a first dispersion of an acrylic ester copolymer, rubber-containing or not, and a second dispersion of a chloroprene polymerate, the usual auxiliaries or additives also being present in the small amounts indicated.
  • the addition of boric acid is particularly favorable.
  • Basic adhesives are among others manufactured and sold by the patent owner, Alfa Klebstoffe AG, CH-8454 Buchberg, under the SIMALFA brand name.
  • lecithin-free base adhesive it is also of particular importance that the essential properties of the lecithin-free base adhesive are retained when substantial amounts of lecithin are added. This applies, for example, to water resistance, paint adhesion and, in the case of thermoplastics, to heat sealability. If an adhesive layer is hot-sealed after reaching the cohesive break area, it loses cohesion during the liquefaction, which in practice lasts a few seconds at most, and regains the same cohesion and adhesive force immediately after hardening, ie remains in the area of the cohesive break. The addition of lecithin only works a gradual decrease in the maximum value of cohesion.
  • the object is achieved according to the invention in that the aqueous adhesive dispersion is applied to at least one of the substrate surfaces to be bonded, the substrate surfaces are placed wet on top of one another and are
  • At least one of the substrate surfaces is porous, so it is permeable to water or absorbent.
  • Thin layers of adhesive are applied in the range of at least a few grams per m 2, for example 2 to 50 g / m 2.
  • An adhesive strip which is at least about 2 mm, in particular 10 to 15 mm wide, is preferably applied to large substrate areas, this strip being continuous or interrupted.
  • the aqueous dispersions according to the invention are always advantageous over adhesives with organic solvents used according to the prior art.
  • An increase in the adhesive force can also be achieved if hot activation takes place. If the adhesive is warmed up a little, the cohesion increases.
  • An aqueous adhesive dispersion composed and applied according to the invention always leads to a connection of two substrate surfaces with high initial adhesion, initially constant or increasing and after a short time decreasing cohesion into the area of the cohesive break.
  • the initial adhesive force acts immediately after laying on and pressing on, the cohesion and the adhesive force (adhesion) reach a maximum value after a short time, usually after a few minutes. Then the cohesion decreases to a maximum of approximately 50%, in particular to a maximum of approximately 30% of the maximum value and remains approximately constant, the range of a low cohesion break during peeling is reached. If the adhesion is once less than the cohesion, an adhesion break occurs during peeling, the adhesive layer is retained and as such is detached from the relevant substrate surface.
  • Coated substrate surfaces are, for example, normal paper, coated paper, printed paper, also poorly anchored lines and printing inks, and cardboard. Even difficult substrates such as metal foils, PVC and the like can be coated with an appropriate adhesive dispersion containing lecithin.
  • Wrinkles must have a good initial adhesive force, but afterwards, if possible, remove them without tearing the paper are.
  • inserts can also be applied to printed and / or illustrated pages without problems, the peeling with a cohesive break in the case of greatly reduced cohesion prevents the ink from peeling off or even a paper break.
  • Inserts pre-coated over the entire surface with lecithin-containing, thermoplastic adhesive can be glued in by means of punctiform or strip-shaped heat sealing; the greatly reduced cohesion for a cohesive fracture when being removed remains.
  • the adhesive residues left on the paper are transparent and do not disturb the reader any further.
  • the beginning is glued onto a cardboard tube, the end onto the roll.
  • An increased initial liability for the beginning and the end is advantageous in terms of production technology, as is easier peeling during use, for example in the case of a toilet roll.
  • Labels of all kinds can be applied not only to a carrier with a silicone base, but also to paper for storage on a roller conveyor and the like. Then it is particularly important to apply it with an increased initial adhesive force and peel it off by breaking the cohesion with greatly reduced cohesion. A label loss at the beginning and end is always prevented.
  • Items offered in the multipack are usually "bundled" with a shrinkable wrapping film with a thickness of 60 to 70 ⁇ m.
  • a heat-sealable polyethylene dispersion is applied in the form of a 10 mm wide strip, namely the SIMALCO 5512 adhesive from Alfa Klebstoffe AG, CH-8454 Buchberg,
  • This adhesive a water-based, fast-setting synthetic resin adhesive with about 35% by weight lecithin, based on the solid, serves e.g. the mechanical fixation of cardboard and label roll ends. It can also be applied to a substrate surface with poorly anchored lines and printing inks. The application takes place with roller application or electronically controlled nozzle application. Both applications have very good machine running properties.
  • SIMALCO 5512 has the following essential properties:
  • the time-independent peel value of 50 g according to FIG. 1 is characteristic of weak paper, for example newsprint.
  • the initial adhesive force is lower with a peel value of about 10 g.
  • the cohesion increases to about 45 g and drops to a value of less than 10 g after 30 min.
  • the peel value according to curve 4 remains approximately constant over the next 30 minutes. After half an hour, richly printed paper has such a low peel value that the cohesive break not only remains without the slightest damage to the paper, but also has no effect on the printing ink.
  • the lecithin-containing adhesive sets much faster on unprinted, coated paper than on saturated printed paper, which is why a higher initial adhesion and a higher maximum cohesion and adhesive force (adhesion) are achieved. 2, the possible paper tear-out limit is not reached even with newsprint.
  • the adhesive used is matched to the respective conditions using expert knowledge.
  • the parameters initial adhesion, maximum cohesion, time to reach maximum cohesion, time to reach cohesion break and peel value in the area of cohesion break are the main parameters to be taken into account.
  • curve 5 results. This runs horizontally for about 10 minutes at a value of about 38 g, the cohesion initially corresponds to about the initial tung. Then the cohesion first decreases more strongly, then weakly, and after 60 minutes reaches an approximately constant peel value of about 13 g, as always in relation to a 15 mm wide adhesive strip.
  • Trends of type 3, 4 or 5 according to FIG. 2 tend to be approximately the same for other adhesives with at least about 30% by weight lecithin.
  • an initial adhesion arises, which increases to a maximum value for the cohesion within a few minutes or remains constant for the time being.
  • the cohesion decreases more strongly in the course of the following minutes, weaker after 20 to 30 minutes to a minimum value which is usually reached after 0.5 to 2 hours. This allows easy peeling under a cohesive break in the adhesive layer.
  • the adhesive force is always greater than the cohesion, at least in the cohesive fracture area, otherwise the adhesive layer would delaminate from the substrate surface instead of being separated.
  • the SIMALCO 5502 adhesive likewise a lecithin-containing synthetic resin adhesive according to the present invention, also contains, based on the solids content, more than about 30% by weight of lecithin and sets very quickly. It is particularly suitable for difficult substrates such as metal foils, PVC, etc.
  • the plasticizer-free copolymer dispersion contains about 50% solids, has a pH of about 6 and a viscosity of about 445 mPas.
  • lecithin-containing aqueous dispersion adhesives met all requirements with regard to the initial adhesion and the time profile of the peel values (see FIG. 2), the% by weight always referring to the solids content:
  • Variants c) to f) have the additional advantage that a film-shaped substrate can be removed elastically and always continuously. 2, the peel values of the adhesives a) and b) run essentially according to curves 3 or 4, the peel values of the adhesives c) to f) according to curve 5.
  • Acronal 205 dispersion adhesive also an aqueous acrylic resin copolymer, with a lecithin content of at least 30% by weight with respect to the solids content, sticky residues are obtained after peeling off a substrate by cohesive fracture, which residues again after pressing on a clean substrate surface tie. In the tests with other adhesives, the residues after the cohesive break are blunt, a new adhesive connection with the residues is not possible. This is e.g. important for labels applied on a roll, removable and applied for the labeling of objects.

Abstract

L'invention concerne une colle à teneur en lécithine à appliquer sur l'une des faces ou sur les deux faces des substrats à coller. Pour produire cette colle, on mélange une dispersion aqueuse d'une colle base à fort indice d'adhérence initiale avec de la lécithine, à raison d'environ 30 % en poids de la matière solide. Pour coller, les surfaces de substrat sont humectées avant d'être placées l'une sur l'autre, puis pressées l'une contre l'autre pendant au moins 0,1 sec avec une force d'au moins 0,1 N/cm2. Cette colle est particulièrement utile dans l'imprimerie. Le lecteur n'a aucune peine a détacher des cartes collées, des enveloppes ou des brochures malgré la forte adhérence qui leur est conférée lors du processus de fabrication.
PCT/CH1997/000313 1996-08-26 1997-08-25 Colle a teneur en lecithine WO1998008910A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU38455/97A AU3845597A (en) 1996-08-26 1997-08-25 Glue containing lecithine
DE19780894T DE19780894D2 (de) 1996-08-26 1997-08-25 Lecithinhaltiger Klebstoff

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2083/96 1996-08-26
CH208396 1996-08-26

Publications (1)

Publication Number Publication Date
WO1998008910A1 true WO1998008910A1 (fr) 1998-03-05

Family

ID=4225514

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1997/000313 WO1998008910A1 (fr) 1996-08-26 1997-08-25 Colle a teneur en lecithine

Country Status (3)

Country Link
AU (1) AU3845597A (fr)
DE (1) DE19780894D2 (fr)
WO (1) WO1998008910A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5372061A (en) * 1976-12-09 1978-06-27 Toyo Ink Mfg Co Ltd Composition capable of controlling the strength of heat sealing
JPH07157741A (ja) * 1993-12-10 1995-06-20 Toyo Ink Mfg Co Ltd 再剥離型水性感圧接着剤組成物

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5372061A (en) * 1976-12-09 1978-06-27 Toyo Ink Mfg Co Ltd Composition capable of controlling the strength of heat sealing
JPH07157741A (ja) * 1993-12-10 1995-06-20 Toyo Ink Mfg Co Ltd 再剥離型水性感圧接着剤組成物

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 123, no. 12, 18 September 1995, Columbus, Ohio, US; abstract no. 146230, XP002047597 *
CHEMICAL ABSTRACTS, vol. 89, no. 16, 16 October 1978, Columbus, Ohio, US; abstract no. 130695, XP002027899 *
DATABASE WPI Week 8514, Derwent World Patents Index; AN 85-083147, XP002027901 *

Also Published As

Publication number Publication date
AU3845597A (en) 1998-03-19
DE19780894D2 (de) 1999-09-09

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