CN101481563A - Heat sealed coating composition - Google Patents
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- CN101481563A CN101481563A CNA2008100951478A CN200810095147A CN101481563A CN 101481563 A CN101481563 A CN 101481563A CN A2008100951478 A CNA2008100951478 A CN A2008100951478A CN 200810095147 A CN200810095147 A CN 200810095147A CN 101481563 A CN101481563 A CN 101481563A
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Abstract
The invention relates to a heat-sealed dope being suitable for sealing different types of substrates, which comprises film-forming ability dispersions formed by at least two different polymer types A and X respectively having different adhesion properties in an organic solvent system L; wherein, at least one polymer type can be infinitely mixed and dissolved with an organic solvent in room temperature; the two polymer types respectively have the acid value of 0-16mgKOH/g of polymer; and the dispersions also contain polymers formed by constituents corresponding to the two polymer types apart from the two polymer types A and X.
Description
Technical field
The present invention relates to heat sealable coating composition based on polymkeric substance.
Background technology
Industry is the demand multilayer materials constantly.Application Areas for example is plastic wrapping, wherein uses rigidity, semi-rigid or soft material.Matrix material both can also can prepare by lamination by coextrusion.Often plastics composite and the Application Areas of using thereof for example is summarized in Ul lmanns
Der Techn.Chemie (Liv Ullmann technical chemistry complete works), the 16th volume, 101-103 page or leaf.In-problem is for example aluminium and some plastics such as polyolefinic complex body, or plastics are to each other as polymethylmethacrylate and polyacrylic complex body.
From polyolefinic heat sealable graftomer known in the state of the art.Adopt ethylene-propylene copolymer (monomer that is grafted to adhesion promotion is as on (methacryloxy) propyl trimethoxy silicane and the glycidyl methacrylate) for example to obtain metal adhesion (referring to JP-OS 76-65 185, JP-OS 76-125 122, JP-OS 77-21 089).Carboxylic polyolefine with adhesion property for example can be by acrylic acid-grafted to ethylene-propylene copolymer (referring to JP-OS 79 90 346, JP-OS 76-104 954) or be grafted to ethylene-acrylic acid alkyl ester copolymer (referring to DE-OS 26 06 389, BE-PS 875 974) and go up and obtain.In described patent documentation, can find information about the emulsifying agent that is used for Aquo System, this emulsifying agent can be by for example vinyl-acetic ester-ethylene copolymer and α, the grafting and prepare (JP-OS 77-142 687, JP-OS 77-142 686) in organic solvent of beta-unsaturated acid and ester.The stable suspension of carboxylic graftomer in organic solvent obtains (European patent discloses 47 705) by the solution of graftomer in organic solvent is cooled off fast.In this suspension, add the powdered polyolefine or with acrylic acid-grafted polyolefine, wherein obtain to contain the stable suspension of 10-25 weight % polymkeric substance.By similar measure, the solution heptane obtains suspension (FR-OS 2 470 002) from acrylic acid-grafted polyethylene and paraffin, polystyrene or ethylene-propylene copolymer.
In addition from the polyolefin-based adhesive mixture of DE-OS 31 26 451 known modifications, it contains the graft copolymer that (a) 0.1-40 weight part is made up of about 70-99.999 weight % polyethylene basis thing, this polyethylene basis thing has at least a monomer as the grafted branches part of 30-0.001 weight %, described monomer self by at least a polymerisable ethylenically unsaturated carboxylic acids or corresponding carboxylic acid acid anhydride to realize that total value is that 100% amount is formed, (b) about 99.9-60 weight part resin compound of going into to be mixed, it forms until total value by about 25-75 weight % linear low density polyethylene and about 75-25 weight % polypropylene is 100%.Two kinds of polymer base things are like this corresponding to the polyolefine of same polymer type.From this DE-OS, can not know application with the dispersion form.
Summary of the invention
Problem
Industrial with a lot of versions propose graftomer as heat sealable coating or along with the proposition of some other problem as hot-melt adhesive.This attempt by with the monomer that contains known adhesion promotor group, particularly carboxylic monomeric copolymerization or graft polymerization are satisfied adhering requirement enough on the metallic surface.
Polymkeric substance generally is applied on the face to be joined or to be coated with solid form, and thermal bonding or sealing in known manner.Not long ago the precondition of the polymer slurry in organic solvent of Ti Chuing is two stage preparation method, wherein at first with the polymers soln thermal quench and to the other polymkeric substance of wherein introducing with powder type (EU-A 47 705).The predetermined core diameter of polymer powder is the 5-80 micron.The temperature that polymers soln is heated in the first step must be enough to make polymer dissolution.Judge that according to embodiment 5% ethene dissolved temperature is 150 ℃ in heptane.
The unexpected refrigerative of this solution mandatory (particularly on technical scale) is the burden of this method.Then, polymkeric substance must be mixed into certain degree of distribution in the suspension of such preparation with powder type, wherein must obviously be suitable for special final condition for every kind of polymer/solvent system.
Therefore, the heat sealable coating composition that need form by the multiple polymers component, it shows adhesivity by different way with respect to various dissimilar adhesion grounds.This coating should prepare with alap technology spending according to industrial polymerization process.
Solution
For solving problem of the present invention, the described method of the claim of giving chapter and verse.
The classification that is suitable for the polymer type of coating of the present invention derives from given feature.(also referring to Ullmanns
, with above-mentioned quoted passage).The acid number of polymkeric substance is defined as the quantity of KOH, and it is enough to the sample with 1g, i.e. polymkeric substance neutralization.(referring to F.De Snell ﹠amp; L.S.Ettre, Encyclopedia ofIndustrial Chemical Analysis (technical chemistry is analyzed complete works of), the 8th volume, 389-395 page or leaf, Interscience Publishers 1969).
The diversity of polymer type A and X constitutes from different types of monomer type based on them.They are for example generally incompatible each other in solvent.Can mention for example polyolefine and olefin copolymer (OCP) as various polymer type, also have polymethacrylate or polyacrylic ester (acrylic resin) in addition, also have polyvinylesters or polyvingl ether or polyvinyl acid amides in addition, as long as they have different or inconsistent adhesion property.Be called A and X below described two kinds of different polymer types to distinguish.The polymkeric substance that is made of two kinds of polymer type A and X that the present invention exists in addition can be graftomer or block polymer.The graftomer that generally has the emulsifying agent performance is therefore by forming corresponding to the component of these two kinds of polymer type A and X; Can first approximation (erster
) represent that by formula AX wherein A and X represent the inferior segment (sequence) corresponding to polymer A and X separately respectively.
Generally, the part by weight of the total amount of the polymer unit of the total amount of the polymer unit of type A and type X is 1:20 to 20:1 in the dispersion.The present invention based on technical finesse can further set forth according to acrylic resin (=polymkeric substance X) on the other hand on the one hand according to olefin polymer and multipolymer (=polymer A).
The graftomer to be used according to the present invention is corresponding to type i
A′-X′ I
The segment formed by olefin copolymer sequence, hydrogenated polyisoprene sequence or hydrogenated butadiene/isoprene copolymer of A ' expression wherein.
Olefin polymer and the multipolymer self corresponding to A to be used according to the present invention are known.This relates generally to by ethene, propylene, butylene or/and the polymkeric substance that other alkene with 5-20 C atom constitutes, those as having recommended as heat sealable composition.Molecular weight is generally 10000-300000, preferred 50000-150000.The olefin copolymer for the treatment of type used for example is described in German prospectus DE-OS16 44 941, DE-OS 17 69 834, DE-OS 19 39 037, DE-OS 19 63 039 and DE-OS2059981.If the segment that A ' is made up of the hydrogenant polyisoprene then is preferably based on commercially available segmented copolymer (the commodity SHELLVIS for example of the polyisoprene/polystyrene of selective hydration
).
That can use particularly well is ethylene-propylene copolymer; Same also possible be ter-polymers (referring to Macromolecular Reviews, the 10th volume (1975)) by adding known the 3rd component such as ethylidene norbornene, still count its crosslinked tendency in weathering process.It may be random basically being distributed in this, but also can advantageously use the sequential polymerization thing with ethylene block.The ratio of monomer ethylene-propylene is variable in certain limit at this, and this limit can be used about 95% for ethene, can use about 95% as the upper limit for propylene.
Polymkeric substance X or segment X ' are made up of polyacrylic ester and/or polymethacrylate sequence according to definition among the formula I.These for example dissolve among the solvent system L with corresponding homopolymer or multipolymer form by inference self.Polymkeric substance X or block X ' generally comprise more than 50 weight %, the monomer of the formula II of preferred 80-100 weight % (if for example based on segment X ' meter),
R wherein
1Be hydrogen or methyl, and R
2Be to have 1-30 carbon atom, alkyl, araliphatic or the aromatic group of preferred 1-20 carbon atom.Among the polymkeric substance X or among the segment X ', can also exist:
The monomer of formula III
R wherein
1' be hydrogen or methyl, or/and polymerisable acid anhydrides, and/or the monomer of formula IV
R wherein
1" be hydrogen or methyl, and Z choose the phenyl that replaces through alkyl ,-COR wantonly
3Group,
Group ,-OR
4Group, or chlorine atom, and R wherein
3And R
4Be the alkyl with 1-20 carbon atom or the phenyl of optional branching, n is 0 or 1, and/or the monomer of formula V
R wherein
5And R
8Be hydrogen or group-COOR
7', R
6Be hydrogen or group-CH
2COOR
7", condition is that the compound of formula V must contain two carboxylic groups, and R wherein
7, R
7' and R
7" be hydrogen, or have the alkyl of the optional branching of 1-20 carbon atom, or phenyl.Polymkeric substance X or segment X ' can choose the monomer that also contains a certain proportion of formula VI wantonly
R wherein
1" ' have R
1Implication, and Bs be nitrogenous functional group as-C ≡ N group ,-CONR
9R
10Group, wherein R
9And R
10Be hydrogen or alkyl independently of one another with 1-20 carbon atom, or R wherein
9And R
10Comprise 5 yuan of described nitrogen formation or 6 yuan of heterocycles, or wherein Bs is (inertia) heterocyclic group, particularly pyridine, tetramethyleneimine, imidazoles, carbazole, lactan group or its alkyl derivative, or Bs has implication-CH
2OH, or wherein Bs has following implication:
-COO-Q-R
11
Wherein Q is the optional alkylidene group that replaces through alkyl with 2-8 carbon atom, and R
11Be-OH ,-OR
7" ' or group-NR
9' R
10', R wherein
7" ', R
9' and R
10' have and R
7, R
8And R
9Identical implication for example with described nitrogen-atoms, optional comprises that other heteroatoms forms 5-unit to 6-unit heterocycle.
Can mention vinylbenzene, alpha-methyl styrene, vinylchlorid, vinyl-acetic ester, stearic acid vinyl ester, ethenyl methyl ketone, vinyl isobutyl ether, allyl acetate, chlorallylene, allyl group isobutyl ether, allyl methyl ketone, dibutyl maleinate, toxilic acid two lauryls, dibutyl itaconate especially as the monomeric example of formula IV or V.
The monomeric ratio of segment X ' Chinese style III-VI is generally 0-50 weight %, preferred 0-20 weight % (based on the monomer of segment X ').The monomeric ratio of middle formula III of segment X ' and/or VI generally is no more than 20 weight %, is generally 0-10 weight %, preferred 0-5 weight %.
Particularly, segment X ' is advantageously selected in the desired techniques function aspects according to ratio and composition.
The ratio of the polar monomer of formula III and VI generally is no more than 20 weight %, is preferably 0-10 weight % (based on the monomer of segment X '), is preferably 0-5 weight % especially.As the monomer of formula VI can mention C-and N-vinyl pyridine and ethenyl pyrrolidone, vinyl pyrrolidone, vinylcarbazole, vinyl imidazole with and alkyl derivative, N-vinyl compound particularly, the same hydroxyl of acrylic or methacrylic acid in addition-and dialkyl aminoalkyl ester, (methyl) vinylformic acid dimethylamino ethyl ester particularly, (methyl) vinylformic acid dimethylamino propyl ester, (methyl) Hydroxyethyl Acrylate.Segments A among the formula I ' and X ' generally with part by weight 1:20 to 20:1, preferred 1:4 to 1:1 exists.
Generally, containing concentration with the coating of the present invention of OCP dispersion form is 1-80 weight %, graftomer A '-X ' of preferred 5-10 weight %.The preparation of polymeric dispersions can for example be carried out according to German patent application P 32 07 291.0 or 32 07 292.9.
The preparation of graftomer A '-X '
General application rule:
Graftomer A-X is preparation in the following way generally: by suitable emulsifying agent from component A prepare dispersion and on it with component X grafting under to this proper reaction conditions.
At A is that olefin polymer or olefin copolymer and X are that emulsifying agent can have structure (by formula change in addition by A " X "=formula IA and represent) similarly under the situation of acrylic resin (according to system A '-X ' of formula I).The method of the emulsifying agent of preparation proper A " X " type itself is known.For example, can carry out according to shifting the grafted method: (also referring to Houben-Weyl, Methoden der Org.Chemie (organic chemistry method), the 14/1st volume, the 114th page, H.A.J.Battaerd, G.W.Tregear, PolymerReviews (polymkeric substance summary), the 16th volume, Interscience (1967)).
Prepare 10-50% for this reason, the OCP of preferred 20-30% suitable be solution in the inert solvent under polymerizing condition, it has the boiling point that is higher than technological temperature under normal conditions.Suitable solvent for example is the hydrocarbon of butylacetate, aliphatic series, alicyclic and aromatics.In this OCP solution, under specified criteria, add formula II monomer or possible other monomer II I-IV, and under the condition of adding one or more preferred peroxide type radical initiators under 60-150 ℃ of temperature, polymerization in conventional 4-8 hour.Make every effort to transform as far as possible completely.Preferably can use peresters, as crossing the sad tert-butyl ester.Initiator concentration depend on desirable grafting count and desirable segment X " molecular weight.Generally, initiator concentration is 0.2-3 weight %, based on polymkeric substance.
Optional, can also use conditioning agent simultaneously, to regulate desirable segment X " molecular weight.What be suitable as conditioning agent for example is the sulphur conditioning agent, particularly contains the conditioning agent of sulfydryl, for example lauryl mercaptan.Modifier concentration is generally 0.1-1.0 weight %, based on total polymer.The hydroperoxidation that the another kind of method for preparing graftomer A " X " is OCP is as the first step.The hydroperoxide groups in chain of Xing Chenging can cause the graft polymerization of vinyl monomer in the stage subsequently in this way.(referring to H.A.J.Battaerd, G.W.Tregear, Polymer Reviews, quoted passage is the same).
A kind of method for preparing suitable block polymer for example is anionoid polymerization.Can for example carry out like this at this: isoprene or divinyl are adopted suitable anionic initiator (for example organometallic compound) polymerization, and make " activity " negatively charged ion chain end and for example alkyl methacrylate or vinylbenzene reaction.Like this Zhi Bei polymkeric substance then the functional group that make to exist not by the condition of attack under hydrogenation.
About the details of preparation, can be referring to relevant document, Houben-Weyl for example, Methoden derOrg.Chemie (organic chemistry method), 14/1, the 110 page and the last few pages; Block Copolymers (segmented copolymer), D.C.Allport, W.H.Janes, Appl.Sci.Publishers Ltd., London, 1973; Graft Copolymers (graft copolymer), H.A.J.Battaerd, G.W.Tregear, Polymer Reviews (polymkeric substance summary), the 16th volume (1967); Block and Graft Polymers (block and graftomer), W.J.Burlant, A.S.Hoffmann, Reinhold PublishersCorp., New York, 1960.
Solvent system L
The present invention's solvent to be used in solvent system L can be selected from those of requirement of the paint-on technique that meets plastics.Described (optional with form of mixtures) solvent to be used should be inertia and have no doubt generally.Generally, its boiling point is no more than 250 ℃ under 760 holders.
Suitable for example is ketone, as methylethylketone, pimelinketone, and alcohol, as Virahol, propyl carbinol, ether, as 1,4-diox, ester such as ethoxyethyl acetate(EA), propyl acetate.Generally, the selection of solvent system L makes it have from the ability of component A, X and graftomer or block polymer A-X formation dispersion.When selecting L, also can be observed the consistency of polymeric constituent A and X: under A and the inconsistent situation of X, can select for the same good solvent system of two kinds of components as L at this.Like this owing to uncompatibility forms dispersion.Under the A situation compatible with X, L must select to make that being compared to A for X under given temperature is better solvent system; Like this owing to different dissolving quality forms dispersion.
At A is that olefin polymer or olefin copolymer and X are under the situation of acrylic resin (system A '-X '), as solvent system L preferably use olefin copolymer in 40-150 ℃ temperature range swellable to those of the degree (" swelling capacity ") of 5-300 weight %." swelling capacity " at this as giving a definition: the OCP film of the known weight that 1mm is thick, 2cm is long and 0.5cm is wide under the situation of (vide infra) under the temperature of definition-in proof for example under 90 ℃-immerse, and isothermal was deposited 24 hours, with tweezers from solution with its taking-up, adopt filter paper to remove the swelling reagent that adheres to, and directly weigh subsequently.Measure as swollen, in per-cent (based on initial weight) definition weight increasing amount.Swelling capacity is measured and should be carried out being intended to prepare under the temperature that concentrates the OCP emulsion.According to the present invention, swelling capacity should be 5-300% under this temperature.Precondition for the applicability of this standard is the maximum swelling degree that is issued to OCP at above-mentioned specified criteria.
Can mention that the suitable mixture by above-mentioned solvent composition that also has is used for mounting medium.The ratio of solvent system L can be for example 80 in the spissated polymeric dispersions of the present invention, drops to 20 weight % under particularly advantageous situation, preferably is lower than 70, and in fact majority is 55-40 weight %.
The preparation of heat sealable coating composition
That has set forth as mentioned is such, prepare dispersion by suitable emulsifying agent, or at the homogeneous solution of the harmonious down preparation component A of suitable polymers (no) consistency and L in solvent system L, and under to this proper reaction conditions on it graft component X.Generally, the part by weight 1:20 to 20:1 of A and X fraction.The operated by rotary motion reaction conditions makes the content of total polymer be at least 10 weight %, based on a total points prose style free from parallelism (being made up of L and polymkeric substance).Wish high as far as possible polymer content.In fact, make every effort to the content of about 40-80 weight %, generally think and to realize 45-60 weight %.
In preparation method's proper timing, preferably after last grafting, can in coating, add the binding agent that also is fit to preparation " priming paint ", for example vinylchlorid/vinyl-acetic ester/maleic acid for further improving bond strength to metal substrate.
The method according to this invention obtains the heat sealable coating composition with the dispersion form, and it causes stability enough for the course of processing.Stability is at least a couple of days, and several weeks are to the several months under normal conditions.
Heat-sealing method
Can use according to the heat-sealing method of industry by the coating that the present invention is heat sealable.They can be applied on the various suitable ground, for example on metal, plastics, glass, paper, the textiles etc.Coating can adopt known method to carry out equally, for example sprawls scraper (Aufziehrakel) by method of roll coating (technical scale) or employing, and for example k-hand spreader (laboratory scale) carries out.After coating, must remove solvent system by evaporation.This can self known mode, chooses wantonly and is carrying out under the enhanced air cycle and under heat supply.In most cases recommend also heating in drying oven, heat tunnel etc. at last.The temperature of hot stove or heat tunnel depends primarily on the character of ground and depends on used solvent.It is generally 100-200 ℃.Be generally 1min heat-up time.As taking 20 seconds to several minutes scope with reference to value.Under the situation of metallizing, can for example also adopt to be heated to temperature required rolling press operation.As the result who handles, form surface film.
The degree of coating advantageously makes and forms desirable layer thickness.Generally it is 1-15 μ, and preferred 2-10 μ may also comprise the layer thickness of priming paint at this.
Heat-sealing can self known mode be carried out under the condition of using the equipment of this exploitation.The character and the unit coating quality that depend on ground in the condition (for example pressure and temperature) of this application within the specific limits.The sealing time is very short usually, they in small portion (Bruchteilen) zone be several seconds to the several seconds.Decide on condition, can on peelable or no longer strippable coating, carry out.Higher temperature generally helps the firm set of coating.
For polyethylene, heat-sealing temperature is generally 160-210 ℃, for polypropylene, is 180-250 ℃.Sealing load is at kp/cm
2In the scope, be mainly 1-10kp/cm
2, preferred 3-6kp/cm
2
Advantageous effects
Obviously, heat sealable coating of the present invention it is also conceivable that and is used to seal same type or in the aspect of performance materials similar, but this purpose often also can adopt prior art coating to realize satisfactorily.Coating of the present invention especially is suitable for adopting a series of general-purpose plastics such as polypropylene, polystyrene and polyvinyl chloride sealing metal ground, particularly aluminium.In addition, coating of the present invention also is fit to alumiseal on glass.In some cases, for example at the applied metal ground, during aluminium, be the precoating ground maybe advantageously particularly with prime treatment.Suitable priming paint is self known substances, and for example carboxylic PVC multipolymer (vinylchlorid/vinyl acetate copolymer, VMCH).(referring to Ulmanns
, quoted passage is the same).The coating of employing priming paint has the thickness of 1-2 μ usually.Plastic bottom material to be sealed does not generally need to be provided priming paint.But, alternative, (dissolved) priming paint also can be mixed in the polymeric dispersions of the present invention.The for example following realization of extraordinary adhesive attraction to aluminium foil: the ratio of priming paint (VMCH) in total coating is not less than about 2.5-5 weight % after final sealing.But the interpolation of priming paint is not the quality that does not influence coating integral body.When using vinylchlorid/vinyl-acetic ester/maleic acid to be used to adopt the sealing of polystyrene ground, the ratio of priming paint should be no more than 20-40 weight %, under the situation of polypropylene substrate, is no more than 2.5-10 weight %, based on total coating.The coating of priming paint can-as the coating of coating of the present invention-closely carry out according to prior art.Coating of the invention process especially salient point is excellent sealing joints intensity, stripping strength, good resistance to blocking (Blockfestigkeit) and thermotolerance.
Embodiment
Following examples are used to explain the present invention, provide constraints but be not meant to.
The preparation of heat sealable coating (heat-sealing lacquer)
1. the preparation of emulsifying agent
In the Witt still that has impeller-type stirrer, traverse baffle (Wellenbrecher), thermometer and reflux exchanger, (adopt dry ice degassing the) dissolves 84g ethylene-propylene copolymer (70:30) under about 90 ℃ and about 250rpm in the 280g butylacetate
1), (viscosity that 1% solution in Schindler oil 10W10 has under 100 ℃ is 10.4-11mm by thermooxidative degradation in forcing machine for it
2/ sec).
After about 1.5 hours, add 20.2g methyl methacrylate, 20.2g butyl methacrylate and 1.5g and cross the sad tert-butyl ester.After another hour, the 148.3g methyl methacrylate, 148.3g butyl methacrylate and the 4.5g that begin to add as form of mixtures cross the sad tert-butyl ester.Joining day is 3 hours, and stirring velocity is brought up to about 300rpm.Add and finish back two hours, add 0.6g once more and cross the sad tert-butyl ester.Then, bottoms temperature is maintained at about 95 ℃ times other 5 hours.During total time, led nitrogen.Gained solution is taupe, and solids content is about 60%, and instant (aktuelle) viscosity is 7 * 10
5-9 * 10
5MPas (45% about 4000-8000mPas).
1)Product DUTRAL 034, Montedison company
2. dispersion preparation
100g is added in identical equipment as initial charge with the 270g methyl iso-butyl ketone (MIBK) according to the emulsifying agent of embodiment 1, to some dry ice of blending wherein and under 400rpm, be heated to about 90 ℃.After 1 hour, stir the additional ethylene-propylene copolymer (70:30) (2.5 C=C keys on 1000 C atoms) that diene is arranged of adding 150g, the product B UNA437 in H ü ls chemical plant).Can reduce stirring velocity at this.Bottoms temperature is elevated to 95 ℃ and after 2.5 hours, adds 75gBUNA 437 again.After one hour, add 75gBUNA once more.Bottoms temperature is reduced to 85 ℃ and add the 50g methyl iso-butyl ketone (MIBK) after half an hour.Also continue heating 7 hours down then at 85 ℃.During total time, also led nitrogen at this.Dispersions obtained is pewter, and solids content is about 59%, and instant viscosity is 75-150mPas.
3. lacquer preparation (grafting)
250g is derived from test 2 dispersion, 49.3g methyl methacrylate, 49.3g butyl methacrylate, 169g methyl iso-butyl ketone (MIBK) and 1g to be crossed the sad tert-butyl ester be heated to 85 ℃ under 160rpm in identical equipment.After 3 hours, add 0.2g in addition and cross the sad tert-butyl ester.Bottoms temperature kept other 13 hours down at 85 ℃.Before heating, add some dry ice, during total time, led nitrogen.Obtain white-pewter dispersion.The about 45%-48% of solids content, instant viscosity is 15000-55000mPas.
4. Application Example
The aluminium foil that about 40 μ are thick adopts the priming paint of following composition to apply with bed thickness 1-2 μ (drying), and is descending dry 1min at 180 ℃ after the solvent evaporates in the drying oven of laboratory by manual applicator.
Priming paint: 10% vinylchlorid/vinyl-acetic ester/maleic acid derives from (the Vinylite VMCH of Union Carbide company
R)
90%Ethyl acetate
100％
Then, priming paint is reused manual applicator, adopt the heat-sealing lacquer of hereinafter described forming, be coated with the about 6-7 μ cover of dry layer thickness, and dry 1min under 180 ℃ equally.
The heat-sealing lacquer: 62 weight % are according to the concentrated olefin copolymer dispersion of embodiment 3 preparations
38 weight %Methylethylketone
100 weight %
Adopt the laboratory heat-sealing instrument of Brugger company to be sealed under the following conditions by on the following film of forming on the aluminium foil that applies like this: untreated polypropylene, PVC and polystyrene also have little sheet glass (microscope slide) in addition:
| Polypropylene, glass | PVC, polystyrene | |
| Seal temperature: | 200℃ | 180℃ |
| Sealing load: | 6kp/cm 2 | 3kp/cm 2 |
| The sealing time: | 1″ | 0.5″ |
The sample that will store under common temperature and humidity condition (23 ℃, 50% relative air humidity) cuts into the wide bar of 15mm and test (under the glass situation, using the wide microscope slide of 25mm) according to DIN 51 221 in tensile testing machine.
As sealing joints intensity, provide for the required power of the separation of composite membrane, so-called stripping strength with N/15 or 25mm bar width gauge.
In order to measure thermotolerance, the plastics film through sealing is hung down at 60 ℃ the drying oven of laboratory from its free end, and with the free end load 200g weight of aluminium foil.If then there is good thermotolerance in not loss after the adhesive effect between aluminium and the plastics stored under the described conditions in 1 hour.
| Thermotolerance | Ground | Sealing joints intensity |
| Given | Polypropylene | About 8N |
| Given | Polystyrene | 9-10N |
| Given | PVC | About 10N |
| - | Glass | 10-15N (deciding) according to glass |
Claims (18)
1, the heat sealable coating that is suitable for sealing dissimilar grounds, it is made up of the film-forming properties dispersion that two kinds that have different bond propertiess separately different polymer type A and X form in organic solvent system L at least,
It is characterized in that, at least a described polymer type at room temperature can be infinitely miscible with organic solvent system, two kinds of polymer types all have the acid number of 0-160mgKOH/g polymkeric substance separately, and except described two kinds of polymer type A and X, this dispersion also contains the polymkeric substance that is made of the component corresponding to described two kinds of polymer types.
2, heat sealable being suitable for of claim 1 seals the coating of dissimilar grounds, it is characterized in that, the polymkeric substance that the component by corresponding to described two kinds of polymer type A and X of described other existence constitutes is graftomer or block polymer.
3, claim 1 or 2 heat sealable being suitable for seal the coating of dissimilar grounds, it is characterized in that, described dispersion is a film until at least 40 ℃ form resistance to blocking under the solvent-free state on ground to be sealed, its be higher than under 100 ℃ bonding with other ground to be sealed under heat seal condition.
4, claim 1 or 2 heat sealable being suitable for seal the coating of dissimilar grounds, it is characterized in that, A and X part exist with part by weight 1:20 to 20:1 in graftomer or block polymer.
5, each heat sealable being suitable for seals the coating of dissimilar grounds in the claim 1,2 and 4, it is characterized in that, one of described polymer type is olefin polymer or olefin copolymer, and another kind is an acrylic resin, and described grafting or block polymer are corresponding to formula I:
A′-X′ I
Wherein A ' expression is by olefin polymer and/or olefin copolymer sequence, hydrogenated polyisoprene sequence or hydrogenated butadiene/isoprene copolymer, and the sequence of X ' expression acrylic resin type.
6, each heat sealable being suitable for seals the coating of dissimilar grounds among the claim 1-5, it is characterized in that, the carboxyl-content that does not have a kind of polymkeric substance to have in the existing polymkeric substance is greater than 30 weight %, is preferably to be less than 20 weight %, based on single polymer type.
7, heat sealable being suitable for of claim 6 seals the coating of dissimilar grounds, it is characterized in that, the carboxyl-content that the graftomer of formula I or block polymer have is for being less than 20 weight %.
8, heat sealable being suitable for of claim 5 seals the coating of dissimilar grounds, it is characterized in that, described solvent system L does not dissolve described olefin polymer or olefin copolymer basically.
9, each heat sealable being suitable for seals the coating of dissimilar grounds in the claim 5 and 8, it is characterized in that, described olefin polymer or multipolymer in 40-150 ℃ temperature range in emulsification in described solvent system L under the condition of application of shear force.
10, heat sealable being suitable for of claim 9 seals the coating of dissimilar grounds, it is characterized in that, described solvent system L can be with the degree of described olefin copolymer swelling until 5-300 weight % in 40-150 ℃ temperature range.
11, each heat sealable being suitable for seals the coating of dissimilar grounds among the claim 5-10, it is characterized in that described olefin polymer and/or the multipolymer ratio in dispersion is 20-65 weight %, preferred 30-50 weight %.
12, each heat sealable being suitable for seals the coating of dissimilar grounds among the claim 5-11, it is characterized in that the ratio of the graftomer of formula I in dispersion is 1-80 weight %, preferred 5-30 weight %.
13, each heat sealable being suitable for seals the coating of dissimilar grounds among the claim 4-12, it is characterized in that olefin polymer and/or multipolymer part total in the dispersion exist with part by weight 1:20 to 20:1 with described acrylic resin part.
14, each heat sealable being suitable for seals the coating of dissimilar grounds among the claim 1-13, it is characterized in that, described film-forming properties dispersion also contains the priming paint of self using always that is useful on ground to be coated in addition, and quantity is 0-50 weight %, based on the total amount of existing polymkeric substance.
15, seal the method for dissimilar grounds, it is characterized in that, each heat sealable coating among the use claim 1-14.
16, the method for claim 15 is characterized in that, metal substrate is sealed on the ground different with it.
17, the method for claim 16 is characterized in that, aluminum substrates is sealed on the plastic bottom material by polypropylene, polystyrene or igelite type constitution.
18, the method for claim 17 is characterized in that, aluminum substrates is sealed on glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100951478A CN101481563A (en) | 2008-01-08 | 2008-01-08 | Heat sealed coating composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100951478A CN101481563A (en) | 2008-01-08 | 2008-01-08 | Heat sealed coating composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101481563A true CN101481563A (en) | 2009-07-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100951478A Pending CN101481563A (en) | 2008-01-08 | 2008-01-08 | Heat sealed coating composition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101481563A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107636090A (en) * | 2015-05-09 | 2018-01-26 | Ppt Ip股份公司 | For without chemically or physically pre-processing and the adhesive of coating plastic substrate |
-
2008
- 2008-01-08 CN CNA2008100951478A patent/CN101481563A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107636090A (en) * | 2015-05-09 | 2018-01-26 | Ppt Ip股份公司 | For without chemically or physically pre-processing and the adhesive of coating plastic substrate |
| CN107636090B (en) * | 2015-05-09 | 2020-04-14 | Ppt Ip股份公司 | Adhesive for coating plastic substrates without chemical or physical pretreatment |
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