EP2313464A2

EP2313464A2 - Reaction products based on amphiphilic block copolymers and their use as impact modifier

Info

Publication number: EP2313464A2
Application number: EP09780750A
Authority: EP
Inventors: Andreas Kramer; Jürgen Finter
Original assignee: Sika Technology AG
Current assignee: Sika Technology AG
Priority date: 2008-07-18
Filing date: 2009-07-17
Publication date: 2011-04-27
Also published as: CN102099417A; EP2145924A1; JP2011528387A; WO2010007150A3; WO2010007150A2; US20110114257A1

Abstract

The present invention relates to novel impact modifiers which are obtained by reaction of amphiphilic block copolymers. These impact modifiers are particularly suitable for use in heat-curing epoxy resin adhesives.

Description

BASED ON AMPHIPHILES BLOCK COPOLYMER

REACTION PRODUCTS AND THEIR USE AS IMPACTORITY MODIFICATOR

Technical area

The invention relates to the field of impact modifiers and the field of thermosetting epoxy resin compositions.

Background Art Impact modifiers have long been used to improve the strength of adhesives in the event of sudden impact. In particular, epoxy resin compositions generally have high mechanical strengths, but are very brittle, that is, in a sudden force, such as occurs in a collision of vehicles breaks the cured epoxy resin and this leads to destruction of the composite.

Proposals have long been made to increase impact strength through the use of impact modifiers.

Liquid rubbers have long been used for toughness modification. For example, liquid rubbers based on acrylonitrile / butadiene copolymers, such as those available under the name Hypro ™ (formerly Hycar®), have been used.

EP 0 338 985 A2 describes impact-resistant epoxy resin compositions which, in addition to liquid rubbers based on acrylonitrile / butadiene copolymers, additionally comprise liquid rubbers based on polyurethane prepolymers which are terminated with a phenol or a lactam.

WO 2005/007766 A1 discloses epoxy resin compositions which contain a reaction product of an isocyanate-terminated prepolymer and a blocking agent which is selected from the group bisphenol, phenol, benzyl alcohol, aminophenol or benzylamine. However, such epoxy resin compositions have weaknesses in low temperature impact strength (<0 ° C). WO 03/093387 A1 discloses impact-resistant epoxy resin compositions which contain adducts of dicarboxylic acids with glycidyl ethers or of bis (aminophenyl) sulfone isomers or aromatic alcohols with glycidyl ethers. However, these compositions also have deficiencies in low temperature impact strength (<0 ° C).

Recently, e.g. in WO 2006/052725 A1, WO 2006/052726 A1, WO 2006/052727 A1, WO 2006/052728 A1, WO 2006/052729 A1,

WO 2006/052730 A1, WO 2005/097893 A1, proposed to use amphiphilic block copolymers for epoxy resin compositions. However, it has been shown that these impact modifiers act, but that this increase in impact strength, in particular that of low-temperature impact strength, is still insufficient.

DESCRIPTION OF THE INVENTION It is therefore an object of the present invention to provide new impact modifiers which have an improved toughness, in particular even at low temperatures.

Surprisingly, it has now been found that this object can be achieved by impact modifiers according to claims 1 and 6. It has been found that these impact modifiers are best suited for use in thermosetting epoxy resin adhesives. In particular, it has been found that combinations of different impact modifiers according to the invention with one another and / or with other impact modifiers are particularly advantageous. It has been found that the glass transition temperature (T ₉ ) of the cured matrix is not or not significantly negatively influenced by the use of these impact modifiers. It can be easily with epoxy glass transition temperatures above 100 ⁰ C at times even above 130 ⁰ C, reach. In addition, it has been shown that compositions with higher tensile strengths and tensile shear strengths can be achieved.

Further aspects of the present invention are the subject of further independent claims. Particularly preferred embodiments are the subject of the dependent claims. Ways to carry out the invention

The present invention relates in a first aspect

Carboxylic acid group (s) having an impact modifier which is prepared from the reaction of an intramolecular anhydride of a di- or tricarboxylic acid with at least one amphiphilic block copolymer having at least one hydroxyl group.

The impact modifier may have one or more carboxylic acid groups.

Throughout the specification herein, the prefix "poly" in "polyepoxide", "polyol" and "polyphenol" refers to molecules that formally contain two or more of the respective functional groups.

As the "epoxy group" or "epoxy group" is used in the present

O document the structural element ZA .--- denotes. As preferred

Epoxide group is the glycidyl group.

An "impact modifier" in the present document is an addition to a plastic matrix, in particular an epoxy resin matrix, understood that even at low additions, in particular from 0.1 to 35 wt .-%, preferably from 0.5 to 15 wt .-%, a significant increase the toughness of the cured matrix and thus is able to absorb higher bending, tensile, impact or impact stress before the matrix penetrates or breaks.

In the present document, "amphiphilic block copolymer" is understood to mean a copolymer which comprises at least one block segment which is miscible with epoxy resin and at least one block segment which is immiscible with epoxy resin, In particular, amphiphilic block copolymers are those as disclosed in WO 2006/052725 A1, WO 2006/052726 A1, WO 2006/052727 A1, WO 2006/052728 A1, WO 2006/052729 A1, WO 2006/052730 A1, WO 2005/097893 A1, the content of which is hereby incorporated by reference.

Examples of epoxy resin-miscible block segments are especially polyethylene oxide, polypropylene oxide, poly (ethylene oxide-co-propylene oxide) and poly (ethylene oxide-ran-propylene oxide) blocks and mixtures thereof.

Examples of block segments which are immiscible in epoxy resin are, on the one hand, in particular polyether blocks prepared from alkylene oxides which have at least 4 C atoms, preferably butylene oxide, hexylene oxide and / or dodecylene oxide. Particularly preferred as such polyether blocks are polybutylene oxide, polyhexylene oxide and Polydodecylenoxid- blocks and mixtures thereof.

Examples of block segments which are immiscible in epoxy resin are, on the other hand, polyethylene, polyethylene-propylene, polybutadiene, polyisoprene, poly-dimethylsiloxane and polyalkyl methacrylate blocks and mixtures thereof.

In one embodiment, the at least one hydroxyl group-containing amphiphilic block copolymer is a block copolymer of ethylene oxide and / or propylene oxide and at least one further alkylene oxide having at least 4 C atoms, preferably from the group consisting of

Butylene oxide, hexylene oxide and dodecylene oxide.

In another preferred embodiment, the at least one hydroxyl group-containing amphiphilic block copolymer is selected from the group consisting of poly (isoprene-block-ethylene oxide) block copolymers

(PI-b-PEO), poly-ethylene-propylene-b-ethylene oxide-1-block copolymers (PEP-b-

PEO), poly (butadiene-b-ethylene oxide) block copolymers (PB-b-PEO), poly (isoprene-b-ethylene oxide-b-isoprene) block copolymers (PI-b-PEO-PI), poly (isoprene -b- ethylene oxide-methyl methacrylate J block copolymers (PI-b-PEO-b-PMMA) and

Poly (ethylene oxide) -b-poly (ethylene-old-propylene) block copolymers (PEO-PEP).

The amphiphilic block copolymers may be present in particular as diblock, triblock or tetrablock. In the case of multiblocks, ie in particular or tetrablocks, they may be linear or branched, in particular as star block.

The preparation of the amphiphilic block copolymers is known to those skilled in the art, for example from Macromolecules 1996, 29, 6994-7002 and Macromolecules 2000, 33, 9522-9534 and J. Polym. Be. Part B: PoIy m. Phys. 2007, 45, 3338-3348, the disclosure of which is incorporated herein by reference. The amphiphilic block copolymer has at least one hydroxyl group. Depending on the preparation method, the amphiphilic block copolymer may have one or more hydroxyl groups. For example, in the polymerization of alkylene oxides with

Methanol is started and quenched with acid to form an amphiphilic block copolymer with a hydroxyl group.

If, however, with a diol, e.g. Ethylene glycol, started, is formed accordingly an amphiphilic block copolymer having two hydroxyl groups. Are alcohols having three, four or more hydroxyl groups than

Starter used, accordingly arise amphiphilic block copolymers with three, four or more hydroxyl groups.

The preparation can be carried out, for example, in a sequential synthesis process in which first the first monomer, for example butylene oxide, is polymerized with the aid of a starter, followed by the addition of the second monomer, for example ethylene oxide, to the end of the resulting polymer of the first monomer is anpolymehsiert. Thus, for example, using a monol as a starter, an amphiphilic diblock copolymer poly (ethylene oxide) -b-poly (butylene oxide) (PEO-PBO) can be prepared. By using a diol, for example, an amphiphilic tri-block copolymer poly (ethylene oxide) -b-poly (butylene oxide) -poly (ethylene oxide) (PEO-PBO-PEO) is formed. However, it is also possible first to polymerize a first monomer, for example butylene oxide, with the aid of a starter, followed by adding a mixture of two or more monomers, for example a mixture of ethylene oxide and butylene oxide, which is attached to the end of the resulting polymer of the first Monomers are polymerized. Thus, for example, an amphiphilic block copolymer poly (ethylene oxide / butylene oxide) -poly (butylene oxide) -poly (ethylene oxide / butylene oxide) (PEO / BO-PBO-PEO / BO) can be prepared. The carboxylic acid group (s) having impact modifier is prepared from the reaction of at least one amphiphilic block copolymer having at least one hydroxyl group with an intramolecular anhydride of a di- or tricarboxylic acid. An intramolecular anhydride of a di- or tricarboxylic acid can typically be formed from the corresponding di- or tricarboxylic acid by dehydration with ring closure. In this case, an anhydride group is formed intramolecularly. Such intramolecular anhydrides of a di- or tricarboxylic acid are characterized in that the anhydride group is part of a ring.

Particularly suitable intramolecular anhydrides of a di- or tricarboxylic acid are, in particular, those which are selected from the group consisting of maleic anhydride, 2-methyl-maleic anhydride, 2,2-dimethylmaleic anhydride, 2,3-dimethyl-maleic anhydride, malonic anhydride, 2 Methyl-malonic anhydride, 2,2-dimethyl-malonic anhydride, succinic anhydride, glutaric anhydride, adipic anhydride, pimelic anhydride, itaconic anhydride, diglycolic anhydride, (2-dodecen-1-yl) succinic anhydride, methyl norbornene-2,3-dicarboxylic anhydride ( = Methyl nadic anhydride), phthalic anhydride, 3,4,5,6-tetrahydrophthalic anhydride, hexahydrophthalic anhydride, homophthalic anhydride and trimellitic anhydride.

Preference is given to those intramolecular anhydrides of a di- or tricarboxylic acid in which a five-membered or six-membered ring forms during ring closure in the anhydride formation. Thus, preferred anhydrides of a di- or tricarboxylic acid have the following structures:

Here, the substituents Q ¹ , Q ² , Q ³ , Q ^{1 '} , Q ^2' , Q ^{3 '} , Q ⁴ , Q ⁵ , Q ⁴ and Q ^{5 are} each H or a monovalent organic radical or form a two with each other or trivalent organic radical. For the reaction of the amphiphilic block copolymer having at least one hydroxyl group with the intramolecular anhydride of a di- or tricarboxylic acid, the intramolecular anhydride of a di-or tricarboxylic acid and the amphiphilic block copolymer having at least one hydroxyl group are preferably used in such a ratio to each other that the Ratio of the anhydride groups of the anhydride of a di- or tricarboxylic acid to hydroxyl groups of the amphiphilic block copolymer having at least one hydroxyl group is at least 1. In this reaction, the hydroxyl group (s) of the amphiphilic reacts

Block copolymer having the anhydride group of the anhydride of a di- or tricarboxylic acid to form ester group (s) and carboxylic acid group (s).

For the sake of clarity, the preparation of an example of an impact modifier having carboxylic acid groups is schematically illustrated by the following example: ^ .OH

(i) (ii) (iii)

Here, Z ^{1 represents} the remainder of an amphiphilic block copolymer having two hydroxyl groups after removal of the two hydroxyl groups and Z ² for the remainder of an anhydride after removal of the anhydride group. By the

Reaction of the amphiphilic block copolymer having hydroxyl groups of the formula (i) with the intramolecular carboxylic acid anhydride of the formula (ii) forms the exemplary carboxylic acid group-containing impact modifier of the formula (iii).

This reaction occurs in high yield and under mild conditions. These conditions and the reaction procedure are known in principle to the person skilled in the art.

The carboxylic acid group (s) having impact modifiers are typically liquid at room temperature or at least flowable. The carboxylic acid group (s) having impact modifiers can be widely used. Since they cause a significant increase in the toughness of the cured matrix when added to a plastic matrix, in particular an epoxy resin matrix, they themselves are suitable as impact modifiers. However, they can also serve as starting materials for the synthesis of derivatives.

Particularly suitable such derivatives are their reaction products with polyepoxides.

Thus, impact modifiers prepared from the reaction of such a previously described carboxylic acid group (s) impact modifier with at least one polyepoxide constitute another aspect of the present invention.

The polyepoxide here preferably represents a diepoxide, in particular a diglycidyl ether.

On the one hand, especially suitable so-called epoxide reactive diluents are suitable as polyepoxide. Particular examples of such reactive diluents are the polyepoxides listed in detail below as reactive diluents G. As polyepoxide, on the other hand, in particular, those detailed below

Epoxy A listed polyepoxides.

Most preferably, the polyepoxide is a diglycidyl ether of a bisphenol. Most preferably, the polyepoxide is a diglycidyl ether of bisphenol-A.

In one embodiment, the carboxylic acid group (s) having

Impact modifier and the polyepoxide used for the reaction with each other in such a ratio to each other that the ratio of

Carboxylic acid groups of the carboxylic acid group (s) having impact modifier to the epoxide groups of the polyepoxide is greater than 1.

In this case, carboxylic acid group-having impact modifiers are obtained. To increase the intelligibility, the previously mentioned example is taken up again here. From the reaction of the exemplary carboxylic acid group-containing impact modifier of the formula (iii), an excess of an exemplary polyepoxide of the formula (iv) is converted to the exemplary carboxylic acid group-containing impact modifier of the formula (v):

HHiieerrbbeeii sstteehhtt Z ³ is the radical of a diepoxide after removal of two epoxy groups.

In a further, particularly preferred embodiment of the

Carboxylic group (s) having impact modifier and the polyepoxide used for the reaction with each other in such a ratio to each other that the ratio of the carboxylic acid groups of the carboxylic acid group (n) having impact modifier to the epoxide groups of the polyepoxide is less than 1.

In this case, epoxy group-containing impact modifiers are obtained.

To increase the comprehensibility, the previously mentioned example is again included here. From the reaction of the exemplary carboxylic acid group-containing impact modifier of the formula (iii) is reacted in the deficiency of an exemplary polyepoxide of the formula (iv) to the exemplary epoxy-containing impact modifier of the formula (vi):

In both embodiments, polyepoxide groups are reacted with carboxylic acid groups. The person skilled in the art is well aware of the conditions, in particular temperatures and catalysts, for such a reaction.

The carboxylic acid group-containing impact modifiers or impact modifiers containing epoxide groups are typically liquid or at least free-flowing at room temperature.

It is also clear to the person skilled in the art that the carbonic acid group-containing impact modifiers or impact modifiers containing epoxide groups, in turn, can again serve as starting materials for further reactions, in particular with polyepoxides, polyamines, polyols or polyisocyanates.

The carboxylic acid group (s) or epoxy group-containing impact modifiers described when added to a plastic matrix, in particular an epoxy resin, a significant increase in the toughness of the cured and are therefore very suitable as impact modifiers.

They may in particular be constituents of one- or two-component adhesives, sealants, coatings and coverings, in particular floor coverings. Preferably, such systems are epoxy resin compositions.

In a further aspect, the present invention relates to a one-part thermosetting epoxy resin composition which

at least one epoxy resin A having on average more than one epoxide group per molecule;

- At least one hardener B for epoxy resins, which is activated by elevated temperature;

- At least one previously described impact modifier; contains. The epoxy resin A having an average of more than one epoxy group per molecule is preferably an epoxy liquid resin or a solid epoxy resin. The term "solid epoxy resin" is well known to the person skilled in the art and is used in contrast to "liquid epoxy resins". The glass transition temperature of solid resins is above room temperature, ie they can be comminuted at room temperature to form pourable powders.

Preferred solid epoxy resins have the formula (X)

Here, the substituents R 'and R "are independently of one another either H or CH _3. Furthermore, the subscript s stands for a value of> 1.5, in particular from 2 to 12.

Such solid epoxy resins are commercially available, for example, from Dow or Huntsman or Hexion.

Compounds of formula (X) with an index s between 1 and 1.5 are referred to by the skilled person as semisolid epoxy resins. For the present invention, they are also considered as solid resins.

However, preferred are epoxy resins in the narrower sense, i. where the index s one

Value of> 1.5.

Preferred liquid epoxy resins have the formula (XI)

Here, the substituents R '"and R""independently of one another are either H or CH _3. Furthermore, the index r stands for a value from 0 to 1. Preferably, r stands for a value of less than 0.2. They are thus preferably diglycidyl ethers of bisphenol

A (DGEBA), bisphenol-F and bisphenol A / F. Examples of such liquid resins are Araldite® GY 250, Araldite® PY 304, Araldite® GY 282

(Huntsman) or D.E.R. ™ 331 or D.E.R. ™ 330 (Dow) or Epikote 828 (Hexion).

Also suitable as epoxy resin A are so-called novolacs. These have in particular the following formula:

H or methyl and z = 0 to 7.

In particular, these are phenol or cresol Novolake (R2 = CH ₂ ).

Such epoxy resins are commercially available under the tradename EPN or ECN and Tactix®556 from Huntsman or under the D.E.N. ™ product line from Dow Chemical.

Preferably, the epoxy resin A is an epoxy liquid resin of the formula

In a still more preferred embodiment, the thermosetting epoxy resin composition contains both at least one epoxy liquid resin of formula (XI) and at least one solid epoxy resin

Formula (X).

The proportion of epoxy resin A is preferably 10 to 85% by weight, in particular 15 to 70% by weight, preferably 15 to 60% by weight, of the weight of the composition. It has been found that it is advantageous to use several impact modifiers according to the invention in combination.

The proportion of the impact modifier described above is preferably 1 to 45% by weight, in particular 3 to 35% by weight, of the weight of the composition.

The inventive composition further contains at least one hardener B for epoxy resins, which is activated by increased temperature. It is preferably a curing agent which is selected from the group consisting of dicyandiamide, guanamines, guanidines, aminoguanidines and derivatives thereof. Also possible are accelerating effective curing agents, such as substituted ureas, such as 3- (3-chloro-4-methylphenyl) -1, 1-dimethylurea (chlorotoluron), or phenyl-dimethylureas, in particular p-chlorophenyl-N, N-dimethylurea ( Monuron), 3-phenyl-1, 1-dimethylurea (fenuron) or 3,4-dichlorophenyl-N, N-dimethylurea (diuron), N, N-dimethylurea, N-isobutyl-N ', N'-dimethylurea and adducts of diisocyanates and dialkylamines. Examples of such adducts of diisocyanates and dialkylamines are 1, 1 '- (hexane-1, 6-diyl) bis (3,3'-dimethylurea) which is readily accessible by the reaction of hexamethylene diisocyanate (HDI) and dimethylamine or the analogous Urea compound which results from the addition of isophorone diisocyanate (IPDI) to dimethylamine. Furthermore, compounds of the class of imidazoles, imidazolines and amine complexes can be used.

Hardener B is preferably a hardener which is selected from the group consisting of dicyandiamide, guanamines, guanidines, aminoguanidines and their derivatives; substituted ureas, in particular 3- (3-chloro-4-methylphenyl) -1, 1-dimethylurea (chlorotoluron), or phenyl-dimethylureas, in particular p-chlorophenyl-N, N-dimethylurea (monuron), 3-phenyl-1, 1-dimethylurea (fenuron), 3,4-dichlorophenyl-N, N-dimethylurea (diuron), N, N-dimethylurea, N-iso- Butyl-N ', N'-dimethylurea, 1, 1' - (hexane-1, 6-diyl) bis (3,3'-dimethylurea) and imidazoles, imidazole salts, imidazolines and amine complexes Particularly preferred as a curing agent B is dicyandiamide.

Advantageously, the total amount of the curing agent B is 1 to 10% by weight, preferably 2 to 8% by weight, based on the weight of the total composition.

The thermosetting epoxy resin composition may further contain a thixotropic agent C based on a urea derivative. In particular, the urea derivative is a reaction product of an aromatic monomeric diisocyanate with an aliphatic amine compound. It is also quite possible to react several different monomeric diisocyanates with one or more aliphatic amine compounds or a monomeric diisocyanate with several aliphatic amine compounds. The reaction product of 4,4'-diphenylmethylene diisocyanate (MDI) with butylamine has proved to be particularly advantageous.

The urea derivative is preferably present in a carrier material. The carrier material may be a plasticizer, in particular a phthalate or an adipate, preferably a diisodecyl phthalate (DIDP) or dioctyl adipate (DOA). The carrier may also be a non-diffusing carrier. This is preferred to ensure as little as possible migration after curing of unregulated components. Preferred non-diffusing carriers are blocked polyurethane prepolymers. The preparation of such preferred urea derivatives and

Support materials are described in detail in the patent application EP 1 152 019 A1, the contents of which are hereby incorporated by reference. The support material is advantageously a blocked polyurethane prepolymer, in particular obtained by reacting a trifunctional polyether polyol with IPDI and subsequent blocking of the terminal isocyanate groups with ε-caprolactam.

Advantageously, the total amount of thixotropic agent C is 0-40% by weight, preferably 5-25% by weight, based on the weight the entire composition. The ratio of the weight of the urea derivative to the weight of the carrier possibly present is preferably from 2:98 to 50:50, in particular from 5:95 to 25:75.

It has further been shown that it is particularly advantageous if the heat-curing one-component epoxy resin composition additionally contains at least one further impact modifier D in addition to the impact modifier described above.

The additional impact modifiers D may be solid or liquid.

In one embodiment, this impact modifier D is a liquid rubber D1, which is a carboxyl- or epoxide-terminated acrylonitrile / butadiene copolymer or a derivative thereof. Such liquid rubbers are commercially available, for example, under the name Hypro ™ (formerly Hycar®) CTBN and CTBNX and ETBN from Nanoresins AG, Germany, and Emerald Performance Materials LLC). The derivatives are in particular epoxy-containing elastomer-modified prepolymers, as under the product line Polydis®, preferably from the product line Polydis® 36 .., by the company Struktol® (Schill + Seilacher Group, Germany) or under the product line Albipox (Nanoresins, Germany) are commercially available suitable.

In another embodiment, the impact modifier is

D a polyacrylate liquid rubber D2, which is completely miscible with liquid epoxy resins and only separates into micro droplets when the epoxy resin matrix hardens. Such polyacrylate liquid rubbers are available, for example, under the name 20208-XPA from Rohm and Haas.

It is clear to the person skilled in the art that, of course, mixtures of liquid rubbers can also be used, in particular mixtures of carboxyl- or epoxide-terminated acrylonitrile / butadiene copolymers or derivatives thereof with epoxy-terminated polyurethane prepolymers. In another embodiment, the impact modifier D is a solid impact modifier which is an organic ion-exchanged layered mineral DE1.

The ion-exchanged layered mineral DE1 can either be

Cation-exchanged layered mineral DE1c or an anion-exchanged layered mineral DE1a.

The cation-exchanged layered mineral DE1c is obtained here from a layered mineral DE1 'in which at least some of the cations have been replaced by organic cations. Examples of such cation-exchanged layered minerals DE1c are in particular those mentioned in US 5,707,439 or in US 6,197,849. Likewise, the process for producing these cation-exchanged layered minerals DE1c is described there. Preferred as a layered mineral DET is a layered silicate. The layered mineral DE1 'is particularly preferably a phyllosilicate, as described in US Pat. No. 6,197,849, column 2, line 38 to column 3, line 5, in particular a bentonite. Layer minerals DE1 'such as kaolinite or a montmorillonite or a hectorite or an illite have proven particularly suitable. At least some of the cations of the layered mineral DEV are replaced by organic cations. Examples of such cations are n-octyl ammonium, trimethyldodecyl ammonium, dimethyl dodecyl ammonium or bis (hydroxyethyl) octadecyl ammonium or similar derivatives of amines which can be obtained from natural fats and oils; or guanidinium cations or amidinium cations; or cations of the N-substituted derivatives of pyrrolidine, piperidine, piperazine, morpholine, thiomorpholine; or cations of 1,4-diazobicyclo [2.2.2] octane (DABCO) and 1-azobicyclo [2.2.2] octane; or cations of N-substituted derivatives of pyridine, pyrrole, imidazole, oxazole, pyrimidine, quinoline, isoquinoline, pyrazine, indole, benzimidazole, benzoxazole, thiazole, phenazine and 2,2'-bipyridine. Also suitable are cyclic amidinium cations, in particular those disclosed in US Pat. No. 6,197,849 at column 3, line 6 to column 4, line 67. Cyclic ammonium compounds are distinguished from linear ammonium compounds by an increased Thermostabil ity from, since the thermal Hoffmann - degradation can not occur in them.

Preferred cation-exchanged layer minerals DE1c are the

Professional known under the term Organoclay or Nanoclay and are commercially available, for example, under the group names Tixogel® or Nanofil®

(Southern Chemistry), Cloisite® (Southern Clay Products) or Nanomer® (Nanocor

Inc.) or Garmite® (Rockwood).

The anion-exchanged layered mineral DE1a is in this case obtained from a layered mineral DE1 "in which at least some of the anions have been exchanged by organic anions An example of such an anion-exchanged layered mineral DE1a is a hydrotalcite DE1" in which at least one part the carbonate anions of the intermediate layers have been replaced by organic anions. It is quite possible that the composition simultaneously contains a cation-exchanged layered mineral DE1c and an anion-exchanged layered mineral DE1a.

In another embodiment, the impact modifier D is a solid impact modifier which is a block copolymer DE2.

The block copolymer DE2 is obtained from an anionic or controlled radical polymerization of methacrylic acid ester with at least one further olefinic double bond

Monomers. Preferred monomers having an olefinic double bond are those in which the double bond is conjugated directly with a heteroatom or with at least one further double bond. In particular, monomers are suitable which are selected from the group comprising styrene, butadiene, acrylonitrile and vinyl acetate.

Preferred are acrylic acid ester / styrene / acrylonitrile copolymers (ASA), available e.g. under the name GELOY 1020 from GE Plastics.

Particularly preferred block copolymers DE2 are block copolymers of methyl methacrylate, styrene and butadiene. Such block copolymers are available, for example, as triblock copolymers under the group name SBM from Arkema. In another embodiment, the impact modifier D is a core-shell polymer DE3. Core-shell polymers consist of an elastic core polymer and a rigid shell polymer. Particularly suitable core-shell polymers consist of a core (core) of elastic acrylate or butadiene polymer which wraps around a rigid shell of a rigid thermoplastic polymer. This core-shell structure is formed either spontaneously by demixing a block copolymer or is given by the polymerization as latex or suspension polymerization with subsequent grafting. Preferred core-shell polymers are so-called MBS polymers, which are commercially available under the trade names Clearstrength ™ from Atofina, Paraloid ™ from Rohm and Haas or F-351 ™ from Zeon.

Particularly preferred are core-shell polymer particles which are already present as a dried polymer latex. Examples of these are GENIOPERL M23A from Wacker with polysiloxane core and acrylate shell, radiation-crosslinked rubber particles of the NEP series, manufactured by Eliokem or Nanoprene from Lanxess or Paraloid EXL from Rohm and Haas.

Further comparable examples of core-shell polymers are offered under the name Albidur ^™ by Nanoresins AG, Germany. Likewise suitable are nanoscale silicates in an epoxy matrix, as are available under the trade name Nonopox from Nanoresins AG, Germany.

In another embodiment, the impact modifier D is a reaction product DE4 of a carboxylated solid nitrile rubber with excess epoxy resin.

In another embodiment, the toughener D is a blocked polyurethane polymer of the formula (IV).

Here, m and m 'each represent values between 0 and 8, with the proviso that m + m' stands for a value of 1 to 8.

Preferably, m is different from 0.

Furthermore, Y ^{1 is} a m + m 'isocyanate-terminated linear or branched polyurethane polymer PU1 after removal of all terminal isocyanate groups.

Y ² independently of one another represents a blocking group which cleaves off at a temperature above 100 ^° C.

Y ³ is independently of one another a group of the formula (IV).

Here, R ^{4 is in} turn a radical of a primary or secondary hydroxyl-containing aliphatic, cycloaliphatic, aromatic or araliphatic epoxide after removal of the hydroxide and epoxide groups and p is 1, 2 or 3.

By "araliphatic radical" is meant in this document an aralkyl group, i.e. by an alkyl group substituted by aryl groups (see Römpp, CD Römpp Chemie Lexikon, Version 1, Stuttgart / New York, Georg Thieme Verlag 1995).

Y ² is, in particular, independently of one another a substituent which is selected from the group consisting of

Here, R ⁵ , R ⁶ , R ⁷ and R ^{8 are} each independently of one another

Alkyl or cycloalkyl or aralkyl or arylalkyl group or R ⁵ forms together with R ⁶ , or R ⁷ together with R ⁸ , a part of a 4- to 7-membered ring, which is at most substituted. Furthermore, R ⁹ , R ⁹ and R ¹⁰ each independently represent a

Alkyl or aralkyl or arylalkyl group or for an alkyloxy or aryloxy or aralkyloxy group and R ¹¹ for an alkyl group.

R ¹² , R ¹³ and R ¹⁴ each independently represent a

Alkylene group having 2 to 5 carbon atoms, which optionally has double bonds or is substituted, or a phenylene group or a hydrogenated phenylene group and R ¹⁵ , R ¹⁶ and R ¹⁷ are each independently H or an alkyl group or an aryl group or a

Aralkyl group.

Finally, R ^{18 is} an aralkyl group or a mono- or polynuclear substituted or unsubstituted aromatic group which optionally has aromatic hydroxyl groups.

The dashed lines in the formulas of this document in each case represent the bond between the respective substituent and the associated molecular radical. As R ¹⁸ , on the one hand phenols or bisphenols are in particular

Consider removal of a hydroxyl group. Preferred examples of such phenols and bisphenols are in particular phenol, cresol,

Resorcinol, pyrocatechol, cardanol (3-pentadecenylphenol (aus

Cashew nut shell oil)), nonylphenol, phenols reacted with styrene or dicyclopentadiene, bisphenol A, bisphenol F and 2,2'-diallyl-bisphenol-A. On the other hand, as R ¹⁸ , in particular, hydroxybenzyl alcohol and benzyl alcohol are considered after removal of a hydroxyl group.

If R ⁵ , R ⁶ , R ⁷ , R ⁸ , R ⁹ , R ^{9 '} , R ¹⁰ , R ¹¹ , R ¹⁵ , R ¹⁶ or R ^{17 is} an alkyl group, this is in particular a linear or branched dC ₂ o-alkyl group.

If R ⁵ , R ⁶ , R ⁷ , R ⁸ , R ⁹ , R ^{9 '} , R ¹⁰ , R ¹⁵ , R ¹⁶ , R ¹⁷ or R ^{18 is} an aralkyl group, this grouping is in particular a methylene-bonded aromatic group, in particular a benzyl group.

If R ^5, R ^6, R ^7, R ^8, R ^9, R ^{9 'or} R ¹⁰ is an alkylaryl group, this is particularly a group bonded through phenylene Cr to C ₂ o alkyl group, such as tolyl or xylyl.

Particularly preferred radicals Y ² are radicals which are selected from the group consisting of

The radical Y in this case represents a saturated or olefinically unsaturated hydrocarbon radical having 1 to 20 C atoms, in particular having 1 to 15 C atoms. As Y in particular AIIyI, methyl, nonyl, dodecyl or an unsaturated cis-alkyl radical having 1 to 3 double bonds are preferred.

The radical X is H or an alkyl, aryl, aralkyl group, in particular H or methyl. The indices z 'and z "stand for the values O, 1, 2, 3, 4 or 5, with the proviso that the sum z' + z" stands for a value between 1 and 5.

The blocked polyurethane polymer of the formula (IV) is prepared from the isocyanate-terminated linear or branched polyurethane polymer PU1 with one or more isocyanate-reactive compounds Y ² H and or Y ³ H. If a plurality of such isocyanate-reactive compounds are used, the reaction carried out sequentially or with a mixture of these compounds. The implementation is such that the one or more

Isocyanate-reactive compounds Y ² H and / or Y ³ H are used stoichiometrically or in stoichiometric excess to ensure that all NCO groups are reacted.

The isocyanate-reactive compound Y ³ H is a monohydroxyl epoxy compound of the formula (IVa).

If several such monohydroxyl-epoxy compounds are used, the reaction can be carried out sequentially or with a mixture of these compounds.

The monohydroxyl epoxy compound of the formula (IVa) has 1, 2 or 3 epoxide groups. The hydroxyl group of this monohydroxyl epoxy compound (IVa) may be a primary or a secondary hydroxyl group.

Such monohydroxyl epoxy compounds can be produced, for example, by reacting polyols with epichlorohydrin. Depending on the reaction procedure, the reaction of polyfunctional alcohols with epichlorohydrin as by-products also produces the corresponding monohydroxy epoxide compounds in different concentrations. These can be isolated by conventional separation operations. In general, however, it is sufficient to use the product mixture obtained in the glycidylation reaction of polyols from polyol which reacts completely and partially with the glycidyl ether. Examples of such hydroxyl-containing epoxides are butanediol mono- glycidyl ether (contained in butanediol diglycidyl ether), Hexandiolmonoglycidyl- ether (contained in hexanediol diglycidyl ether), Cyclohexandimethanolglycidyl- ether, trimethylolpropane diglycidyl ether (as a mixture in trimethylolpropane propantriglycidylether), glycerol diglycidyl ether (as a mixture in Glycehntriglycidylether), pentaerythritol (as a mixture in Pentaerythhttetraglycidylether). Preferably, trimethylolpropane diglycidyl ether, which occurs in a relatively high proportion in customarily prepared trimethylolpropane triglycidyl ether, is used.

However, it is also possible to use other similar hydroxyl-containing epoxides, in particular glycidol, 3-glycidyloxybenzyl alcohol or hydroxymethylcyclohexene oxide. Preference is furthermore given to the β-hydroxy ether of the formula (IVb) which is present in commercially available liquid epoxy resins prepared from bisphenol A (R =CH ₃ ) and epichlorohydrin and contains about 15%, and the corresponding β-hydroxy ethers of the formula (IVb ) formed in the reaction of bisphenol-F (R = H) or the mixture of bisphenol-A and bisphenol-F with epichlorohydrin.

Also preferred are distillation residues, which are obtained in the production of high purity, distilled epoxy liquid resins. Such distillation residues have an up to three times higher concentration of hydroxyl-containing epoxides than commercially available undistilled epoxy liquid resins. In addition, a wide variety of epoxides with a ß-hydroxy ether group, prepared by the reaction of (poly) epoxides with a deficit of monovalent nucleophiles such as carboxylic acids, phenols, thiols or seα-amines can be used. The radical R ⁴ is particularly preferably a trivalent radical of the formula

or where R is methyl or H.

The free primary or secondary OH functionality of the monohydroxyl epoxy compound of the formula (IVa) permits efficient reaction with terminal isocyanate groups of polymers without having to use disproportionate excesses of the epoxide component for this purpose.

The polyurethane polymer PlM, on which Y ¹ is based, can be prepared from at least one diisocyanate or triisocyanate and from at least one polymer Q _PM with terminal amino, thiol or hydroxyl groups and / or from an optionally substituted polyphenol Q _PP .

Suitable diisocyanates are, for example, aliphatic, cycloaliphatic, aromatic or araliphatic diisocyanates, in particular commercially available products such as methylene diphenyl diisocyanate (MDI), 1,4-butane diisocyanate, hexamethylene diisocyanate (HDI), toluene diisocyanate (TDI), tolidine diisocyanate (TODI), isophorone diisocyanate (IPDI), trimethylhexamethylene diisocyanate (TMDI), 2,5- or 2,6-bis (isocyanatomethyl) bicyclo [2.2.1] heptane, 1,5-naphthalene diisocyanate (NDI), dicyclohexylmethyl diisocyanate (Hi ₂ MDI), p-phenylene diisocyanate (PPDI) or m-tetramethylxylylene diisocyanate (TMXDI) and their dimers. Preferred are HDI, IPDI, MDI or TDI.

Suitable triisocyanates are, for example, trimers or biurets of aliphatic, cycloaliphatic, aromatic or araliphatic diisocyanates, in particular the isocyanurates and biurets of the diisocyanates described in the preceding paragraph. Of course, suitable mixtures of di- or

Triisocyanates are used.

Particularly suitable polymers Q _PM with terminal amino, thiol or hydroxyl groups are polymers Q _P M having two or three terminal amino, thiol or hydroxyl groups.

Particularly suitable such polymers Q _PM are those disclosed, for example, in WO 2008/049857 A1, in particular as Q _PM on page 7, line 25 to page 11, line 20, the content of which is hereby incorporated by reference in particular. The polymers Q _P M advantageously have an equivalent weight of from 300 to 6000, in particular from 600 to 4000, preferably from 700 to 2200 g / equivalent of NCO-reactive groups.

Particularly suitable as polymers Q _PM are polyoxyalkylene polyols, also called polyether polyols, hydroxy-terminated polybutadiene polyols,

Styrene-acrylonitrile grafted polyether polyols, polyhydroxy-terminated

Acrylic / Butadiene copolymers, polyester polyols and polycarbonate polyols.

Also particularly suitable as polymers Q _PM are the amphiphilic block copolymers which have at least one hydroxyl group, especially those which are marketed under the trade name Fortegra ™, in particular Fortegra ™ 100, for the production of the previously described carboxylic acid group (s). from Dow Chemical.

As polyphenol Q _PP are particularly suitable bis-, tris- and tetraphenols. These are understood to mean not only pure phenols, but optionally also substituted phenols. The type of substitution can be very diverse. In particular, this is understood to mean a substitution directly on the aromatic nucleus to which the phenolic OH group is bonded. Phenols are furthermore not only understood as mononuclear aromatics, but also as polynuclear or condensed aromatics or heteroaromatics which have the phenolic OH group directly on the aromatic or heteroaromatic compounds. The bis- and trisphenols are particularly suitable. As bisphenols or

Trisphenols are, for example, 1, 4-dihydroxybenzene, 1, 3-dihydroxybenzene, 1, 2-dihydroxybenzene, 1, 3-dihydroxytoluene, 3,5-dihydroxybenzoates, 2,2-bis (4-hydroxyphenyl) propane (= bisphenol -A), bis (4-hydroxyphenyl) methane (= bisphenol-F), bis (4-hydroxyphenyl) sulfone (= bisphenol-S), naphtoresorcinol, dihydroxynaphthalene, dihydroxyanthraquinone, dihydroxy-biphenyl, 3,3-bis (p-) hydroxyphenyl) phthalides, 5,5-bis (4-hydroxyphenyl) hexahydro-4,7-methanoindane, phenolphthalein, fluorescein, 4,4 '- [bis (hydroxyphenyl) -1,3-phenylenebis (1 Methyl ethylidene)] (= bisphenol-M), 4,4 '- [bis- (hydroxyphenyl) -1, 4- Phenylenebis- (1-methyl-ethylidene)] (= bisphenol-P), 2,2'-diallyl-bisphenol-A, diphenols and dicresols prepared by reaction of phenols or cresols with di-isopropylidenbenzol, phloroglucin, bile acid esters, phenol or cresol novolaks with -OH functionality of 2.0 to 3.5 and all isomers of the aforementioned compounds.

Particularly suitable as impact modifier D optionally present in the composition are those disclosed in the following articles or patent specifications, the contents of which are hereby incorporated by reference: EP 0 308 664 A1, in particular formula (I), especially page 5 , Line 14 to page 13, line 24; EP 0 338 985 A1, EP 0 353 190 A1, WO 00/20483 A1, in particular formula (I), especially page 8, line 18 to page 12, line 2; WO 01/94492 A1, in particular the reaction products denoted D) and E), especially page 10, line 15 to page 14, line 22; WO 03/078163 A1, in particular the acrylate-terminated polyurethane resin designated B), especially page 14, line 6 to page 14, line 35; WO 2005/007766 A1, in particular formula (I) or (II), especially page 4, line 5 to page 11, line 20; EP 1 728 825 A1, in particular formula (I), especially page 3, line 21 to page 4, line 47; WO 2006/052726 A1, in particular the amphiphilic block copolymer designated as b), especially page 6, line 17 to page 9, line 10; WO 2006/052729 A1, in particular the amphiphilic block copolymer designated as b), especially page 6, line 25 to page 10, line 2; TJ. Hermel-Davidock et al., J. Polym. Be. Part B: Polym. Phys. 2007, 45, 3338-3348, in particular the amphiphilic block copolymers, especially page 3339, 2nd column to 3341 2nd column; WO 2004/055092 A1, in particular formula (I), especially page 7, line 28 to page 13, line 15. WO 2005/007720 A1, in particular formula (I), especially page 8, line 1 to page 17, line 10; WO 2007/020266 A1, in particular formula (I), especially page 3, line 1 to page 11, line 6, WO 2008/049857 A1, in particular formula (I), especially page 3, line 5 to page 6, line 20, WO 2008/049858 A1, in particular formula (I) and (II), especially page 6, line 1 to page 12, line 15, WO 2008/049859 A1, in particular formula (I), especially page 6, line 1 to page 11 , Line 10, WO 2008/049860 A1, in particular formula (I), especially page 3, line 1 to page 9, line 6, as well as DE-A-2 123 033, US 2008/0076886 A1, WO 2008/016889 and WO 2007/025007.

It has been shown that advantageously several impact modifiers are present in the composition, in particular also several impact modifiers D.

The proportion of impact modifiers D is advantageously used in an amount of 1-45% by weight, in particular 1-35% by weight, based on the weight of the composition.

In a further preferred embodiment, the

Composition additionally at least one filler F. This is preferably mica, talc, kaolin, wollastonite, feldspar, syenite, chlorite, bentonite, montmorillonite, calcium carbonate (precipitated or ground),

Dolomite, quartz, silicic acids (pyrogenic or precipitated), cristobalite, calcium oxide,

Aluminum hydroxide, magnesium oxide, ceramic hollow spheres, glass hollow spheres, organic hollow spheres, glass spheres, color pigments. Filler F is meant to mean both the organic coated and the uncoated commercially available and known to those skilled forms.

Another example is functionalized alumoxanes, such as. As described in US 6,322,890.

Advantageously, the total content of the total filler F is 3 to 50% by weight, preferably 5 to 35% by weight, in particular 5 to 25% by weight, based on the weight of the total composition.

In a further preferred embodiment, the composition contains a physical or chemical blowing agent, as available, for example, under the trade name Expancel ™ from Akzo Nobel or Celogen ™ from Chemtura. The proportion of the blowing agent is advantageously 0.1-3% by weight on the weight of the composition.

In a further preferred embodiment, the composition additionally contains at least one epoxy resin-carrying reactive diluent G. These reactive diluents G are in particular: Glycidyl ethers of monofunctional saturated or unsaturated, branched or unbranched, cyclic or open-chain C ₄ -C ₃₀ alcohols, in particular selected from the group consisting of butanol glycidyl ether, hexanol glycidyl ether, 2-ethylhexanol glycidyl ether, allyl glycidyl ether, tetrahydrofurfuryl and furfuryl glycidyl ether,

Trimethoxysilyl.

- Glycidyl ethers of difunctional saturated or unsaturated, branched or unbranched, cyclic or open-chain C ₂ - C ₃₀ - alcohols, in particular selected from the group consisting of ethylene glycol, butanediol, hexanediol, Oktandiolgylcidylether, cyclohexandimethanoldigylcidylether and Neopentylglycoldiglycidylether.

Glycidyl ethers of trifunctional or polyfunctional, saturated or unsaturated, branched or unbranched, cyclic or open-chain alcohols, such as epoxidized castor oil, epoxidized trimethylolpropane, epoxidized pentaerythrol or polyglycidyl ether of aliphatic alcohols

Polyols such as sorbitol, glycerol or trimethylolpropane.

Glycidyl ethers of phenolic and aniline compounds, in particular those selected from the group consisting of phenyl glycidyl ether, cresyl glycidyl ether, p-tert-butylphenyl glycidyl ether, nonylphenol glycidyl ether, 3-n-pentadecenyl glycidyl ether (from cashew nut shell

Oil), N, N-diglycidylaniline and triglycidyl of p-aminophenol.

- Epoxidized amines such as N, N-diglycidylcyclohexylamine.

Epoxidized mono- or dicarboxylic acids, in particular selected from the group consisting of glycidyl neodecanoate, methacrylic acid glycidyl ester, glycidyl benzoate, phthalic acid, tetra- and

Hexahydrophthalic acid diglycidyl esters and diglycidyl esters of dimeric fatty acids and citrate terephthalic and trimelitic esters.

Epoxidized di- or trifunctional, low to high molecular weight polyether polyols, in particular polyethylene glycol diglycidyl ethers or polypropyleneglycol diglycidyl ethers. Particularly preferred are hexanediol diglycidyl ether, cresyl glycidyl ether, p-tert-butylphenyl glycidyl ether, polypropylene glycol diglycidyl ether and polyethylene glycol diglycidyl ether.

Advantageously, the total proportion of the epoxide group-carrying reactive diluent G is 0.1-20% by weight, preferably 1-8% by weight, based on the weight of the total composition.

The composition may contain other ingredients, in particular

Catalysts, stabilizers, in particular heat and / or light stabilizers, thixotropic agents, plasticizers, solvents, mineral or organic

Fillers, blowing agents, dyes and pigments, corrosion inhibitors, surfactants, defoamers and adhesion promoters include.

Particularly suitable plasticizers are phenol alkyl sulfonic acid esters or benzenesulfonic acid N-butyl amide, such as are commercially available as Mesamoll® or Dellatol BBS from Bayer.

Particularly suitable stabilizers are optionally substituted phenols, such as BHT or Wingstay® T (elixirs), sterically hindered amines or N-oxyl compounds, such as TEMPO (Evonik).

The described thermosetting epoxy resin compositions are characterized by curing by a high impact strength and a glass transition temperature of more than 100 ⁰ C, in particular more than 120 ⁰ C, sometimes even more than 130 ° C, from.

It has been found that the described thermosetting epoxy resin compositions are particularly suitable as one-component adhesives. Such a one-component adhesive has wide application possibilities. In particular, hereby thermosetting one-component adhesives are feasible, which are characterized by a high impact strength, both at higher temperatures and especially at low temperatures, in particular between 0 ⁰ C to -40 ⁰ C. Such adhesives are needed for bonding heat stable materials. Under heat-stable Materials are understood materials, which at a curing temperature from 100 to 220 ⁰ C, preferably 120-200 ⁰ C are dimensionally stable at least during the curing time. In particular, these are metals and plastics such as ABS, polyamide, polyphenylene ethers, composite materials such as SMC, unsaturated polyester GRP, epoxy or acrylate composites. Preferred is the application in which at least one material is a metal. Particularly preferred use is the bonding of the same or different metals, especially in the shell in the automotive industry. The preferred metals are, above all, steel, in particular electrolytically galvanized, hot-dip galvanized, oiled steel, Bonazink-coated steel, and subsequently phosphated steel, and aluminum, in particular in the variants typically occurring in the automobile industry.

With an adhesive based on a heat-curing composition according to the invention, it is possible to achieve the desired combination of high crash resistance both high and low operating temperature.

Such an adhesive is in particular first contacted with the materials to be bonded at a temperature of between 10 ° C and 80 ⁰ C, in particular between 10 ⁰ C and 60 ° C, and later cured at a temperature of typically 100 - 220 ° C, preferably 120-200 ° C.

A further aspect of the present invention relates to a method for bonding heat-stable substrates, comprising the steps of: a) applying a one-component thermosetting epoxy resin composition, as described in detail above, to the surface of a heat-stable substrate S1, in particular a metal; ß) contacting the applied thermosetting epoxy resin composition with the surface of another heat-stable substrate S2, in particular a metal; γ) heating the epoxy resin composition to a temperature of 100 to 130 ⁰ C, preferably from 115 to 125 ° C; δ) contacting the substrates S1 and S2 with the thermosetting epoxy resin composition in contact therewith

Washing liquid at a temperature between 20 and 100 ⁰ C, in particular between 40 and 70 ⁰ C; preferably between 50 and 70 ° C; ε) heating the composition to a temperature of 140 - 220 ⁰ C, in particular from 140 to 200 ° C, preferably between 160 and 190 ° C.

The substrate S2 here consists of the same or a different material as the substrate S1.

From such a method for bonding heat-stable materials results in a bonded article. Such an article is preferably a vehicle or an attachment of a vehicle.

Of course, with a composition according to the invention, in addition to heat-curing adhesives, sealing compounds or coatings can also be realized. Furthermore, the inventive

Compositions not only for the automotive industry but also for others

Application areas. Particularly noteworthy are related applications in transport engineering such as ships, trucks, buses or rail vehicles or in the construction of consumer goods such as washing machines.

The bonded by means of a novel composition materials are typically at temperatures between 120 ⁰ C and -40 ° C, preferably between 100 ° C and -40 ⁰ C, in particular between 80 ° C and -40 ° C for use.

A particularly preferred use of the inventive thermosetting epoxy resin composition is its use as a thermosetting structural adhesive in vehicle construction.

A further aspect of the present invention relates to the use of at least one hydroxyl-containing amphiphilic block copolymers for producing carboxylic acid group (s) having toughening modifiers, in particular as described above. Examples

Preparation of Carboxylic Acid Modifier CGiAS

110.0 g of Fortegra ™ 100 (OH number: 16 mg / g KOH) and 4.74 g of phthalic anhydride (Fluka) were at 140 ⁰ C for 2 hours under

Nitrogen and stirred for 2 more hours under vacuum. It was a viscous carboxylic acid group-containing polymer CGAS with a

Acid value of 15.5 mg / g KOH (theor. 15.7 mg / g KOH).

Preparation of Adhesion Modifier EGAS having epoxy groups

The carboxylic acid group-having CGAS impact modifier prepared as described above was further reacted by adding thereto 165 g of DER 331 (Dow) and 0.55 triphenylphosphine epoxy resin and stirring the mixture under vacuum at 120 ^° C. for 3 hours. A viscous epoxy group-containing EGAS polymer having an epoxide content of 3.14 eq / kg (theoretical 3.15 eq / kg) was obtained.

Preparation of Tack Capacity Modifier SM1 150 g of poly-THF®2000 (OH number 57 mg / g KOH, BASF) and 150 g

Liquiflex H (OH number 46 mg / g KOH, Krahn) was dried under vacuum at 105 ° C for 30 minutes. After the temperature was reduced to 90 ° C, 64.0 g of isophorone diisocyanate and 0.13 g of dibutyltin dilaurate were added. The reaction was carried out under reduced pressure at 90 ^° C. until the NCO content remained constant at 3.30% after 2.5 hours (calculated NCO content: 3.38%). Subsequently, 103.0 g of Cardolite® NC-700 (Cardanol, Cardolite) were added as a blocking agent. It was further stirred at 105 ° C under vacuum until the NCO content had dropped below 0.1% after 3.5 h.

Production of impact modifier SM2

90 g Hypro ™ CTBN 1300X13 (acid number about 29 mg / g KOH, nanoresins), 60 g Hypro ™ CTBN 1300X8 (acid number about 32 mg / g KOH, nanoresins) and 23.2 g Araldite® GT7071 (epoxide equivalent weight approx 510 g / eq, Huntsman) were stirred together with 0.75 g Thphenylphosphin and 0.38g butylated hydroxytoluene (BHT) for 2 hours under vacuum at 140 ⁰ C. Subsequently, 201.8 g DER 354 (Dow) were added and it was further stirred for 2 h at 140 ⁰ C under vacuum. A viscous resin having an epoxide content of about 2.8 eq / kg was obtained.

Preparation of Impact Modifier SM3

318.0 g Jeffamine® T-3000 (Huntsman) and 30.4 g maleic anhydride (Fluka) were stirred for 2 h under nitrogen at 120 ° C. Subsequently, 802 g DER 331 (Dow) and 2.9 g of triphenylphosphine were added and it was further stirred at 110 ⁰ C under vacuum until a constant epoxide content was reached. After about 2 hours, a viscous resin having an epoxide content of about 3.5 eq / kg was obtained.

Preparation of Schlumber's Impact Modifier SM4

200.0 g (about 0.4 eq epoxy) OF 671 (Dow) and 75.0 g (ca. 0.4 eq epoxy groups) of DER 331 (Dow) were stirred for 15 minutes at 120 ⁰ C under vacuum until a homogeneous solution was obtained. Subsequently, 230.0 g (about 0.23 eq NH) of Jeffamine® D-4000 (Huntsman) and 0.5 g (about 0.007 eq of NH) of Jeffamine® T-403 (Huntsman) were added. After stirring for 3 hours under reduced pressure at 120 ° C. and for 1 hour at 130 ° C., a clear, viscous resin having a calculated epoxide content of about 1.13 eq / kg (epoxide equivalent weight = about 890 g / eq) was obtained.

Preparation of the compositions

According to Table 1, the reference compositions Ref.1 to Ref.4 and the novel compositions 1 to 4 were prepared. The components are given in parts by weight. In particular, care has been taken that the compositions each have about the same amount of epoxide groups as the corresponding reference example. In the comparative examples which contain unreacted amphiphilic block copolymer (Fortegra ™ 100), the amount of the respective novel compounds was determined for the corresponding examples according to the invention Impact modifier selected so that they contain the same amount of amphiphilic block copolymer as the starting material.

Test methods: Tensile shear strength (ZSF) (DIN EN 1465)

The test specimens were produced from the described example compositions and with electrolytically galvanized DCO 4 steel (eloZn) with the dimensions 100 × 25 × 1.5 mm or 100 × 25 × 0.8 mm, the bond area being 25 × 10 mm at a layer thickness of 0.3 mm. Hardened for 30 min. At 180 ⁰ C. The train speed was 10mm / min.

Tensile strength (ZF) (DIN EN ISO 527)

An adhesive sample was pressed between two Teflon papers to a layer thickness of 2 mm. Subsequently, the adhesive was cured for 30 minutes at 180 ⁰ C. The Teflon papers were removed and the test specimens to DIN standard were punched out in the hot state. The specimens were measured after 1 day storage under standard conditions at a pulling speed of 2 mm / min.

The tensile strength was determined according to DIN EN ISO 527.

Percussion peeling (ISO 11343)

The test specimens were produced from the described example compositions and with electrolytically galvanized DC04 steel (eloZn) with the dimensions 90 × 20 × 0.8 mm, the bond area being 20 × 30 mm and a layer thickness of 0.3 mm. Hardened for 30 min. At 180 ° C. The measurement of the Schlagschälarbeit was carried out in each case at room temperature and at -30 ⁰ C. The impact velocity was 2 m / s. The fracture energy (BE) in joules is the area under the measurement curve (from 25% to 90%, according to ISO 11343).

Glass transition temperature (T ₀ )

The glass transition temperature was determined by DSC. A device Mettler DSC822 ^{6 was} used for this purpose. 10-20 mg of the compositions were each weighed into an aluminum pan. After the sample in DSC was cured for 30 min. At 175 ° C, the sample was cooled to -20 ⁰ C and then heated at a heating rate of 10 ° C / min to 150 ⁰ C. The glass transition temperature was determined using the DSC software as an average of the measured DSC curve.

Table 1. Compositions and results. BE = fracture energy 2n.m. = not measured.

It can be seen from Table 1 that the compositions containing the impact modifier EGAS, which is an example of an impact modifier according to the invention, have an increase in impact strength compared to the respective comparative composition which does not contain an impact modifier according to the invention. Furthermore, compositions 1, 2, 3 and 4 have a higher tensile strength and tensile shear strength than the corresponding comparative examples Ref1, Ref2, Ref3 and Ref4.

Claims

claims

A carboxylic acid group (s) having impact modifier which is prepared from the reaction of an intramolecular anhydride of a di- or tricarboxylic acid with at least one amphiphilic block copolymer having at least one hydroxyl group.

2. Carboxylic acid group (s) exhibiting impact modifier according to claim 1, characterized in that the at least one hydroxyl group-containing amphiphilic block copolymer is a block copolymer of ethylene oxide and / or propylene oxide and at least one further alkylene oxide having at least 4C atoms, preferably from the group consisting of butylene oxide, Hexylene oxide and dodecylene oxide.

3. Carboxylic acid group (s) exhibiting impact modifier according to claim 1, characterized in that the at least one hydroxyl group-containing amphiphilic block copolymer is selected from the group consisting of poly (isoprene-block-ethylene oxide) block copolymers, poly (ethylene propylene-b-ethylene oxide) - Block copolymers, poly (butadiene-b-ethylene oxide) block copolymers, poly (isoprene-b-ethylene oxide-b-isoprene) block copolymers, poly (isoprene-b-ethylene oxide-methyl methacrylate) block copolymers, and poly (ethylene oxide) - b-poly (ethylene-old propylene) block copolymers.

4. Carboxylic acid group (s) exhibiting impact modifier according to any one of the preceding claims, characterized in that the intramolecular anhydride of a di- or tricarboxylic acid is selected from the group consisting of maleic anhydride, 2-methyl-maleic anhydride, 2,2-dimethyl-Maleinsäureanhydhd, 2 , 3-Dimethyl-maleic anhydride, malonic anhydride, 2-methyl-malonic anhydride, 2,2-dimethyl-malonic anhydride, succinic anhydride, glutaric anhydride, adipic anhydride, pimelic anhydride, itaconic anhydride, diglycolic anhydride, 2-dodecen-1-yl-succinic anhydride, methyl norbornene-2,3-dicarboxylic anhydride (methyl nadic anhydride), phthalic anhydride, 3,4,5,6-tetrahydrophthalic anhydride, hexahydrophthalic anhydride, homophthalic anhydride and trimellitic anhydride.

5. Carboxylic acid group (s) exhibiting impact modifier according to any one of the preceding claims, characterized in that the intramolecular anhydride of a di- or tricarboxylic acid and the amphiphilic block copolymer having at least one hydroxyl group are used for the reaction with each other in such a ratio to each other that the ratio of the anhydride groups of the anhydride of a di- or tricarboxylic acid to hydroxyl groups of the amphiphilic block copolymer having at least one hydroxyl group is at least 1.

6. impact modifier which is prepared from the reaction of a carboxylic acid group (s) having impact modifier according to any one of claims 1 to 5 with at least one polyepoxide.

7. impact modifier according to claim 6, characterized in that the polyepoxide is a diepoxide, in particular a diglycidyl ether, preferably a diglycidyl ether of a bisphenol.

8. impact modifier according to claim 6 or 7, characterized in that the carboxylic acid group (s) having impact modifier and the polyepoxide are used for the reaction with each other in such a ratio to each other that the ratio of the carboxylic acid groups of the carboxylic acid group (n) having impact modifier the epoxy groups of the polyepoxide is greater than 1.

9. impact modifier according to claim 6 or 7, characterized in that the carboxylic acid group (s) having impact modifier and the polyepoxide for the reaction with each other are used in such a ratio to each other that the ratio of the carboxylic acid groups of the carboxylic acid group (n) having impact modifier to the epoxy groups of the polyepoxide is less than 1.

10. A one-component thermosetting epoxy resin composition containing

- At least one impact modifier according to any one of claims 1-9.

11. One-component thermosetting epoxy resin composition according to claim 10, characterized in that the curing agent B is a curing agent which is selected from the group consisting of dicyandiamide, guanamines, guanidines, aminoguanidines and derivatives thereof; substituted ureas, in particular 3- (3-chloro-4-methylphenyl) -1, 1-dimethylurea (chlorotoluron), or phenyl-dimethylureas, in particular p-chlorophenyl-N, N-dimethylurea (monuron), 3-phenyl- 1,1-dimethylurea (fenuron), 3,4-dichlorophenyl-N, N-dimethylurea (diuron), N, N-dimethylurea, N-isobutyl-N ', N'-dimethylurea, 1, 1' - (hexane-1, 6-diyl) bis (3,3'-dimethylurea) as well as imidazoles, imidazole salts, imidazolines and amine complexes.

12. One-component heat-curing epoxy resin composition according to claim 10 or 11, characterized in that it additionally contains at least one further impact modifier D.

13. A method for bonding heat-stable substrates comprising the steps of α) applying a one-component thermosetting epoxy resin composition according to any one of claims 10 to 12 on the surface of a heat-stable substrate S1, in particular a metal; ß) contacting the applied thermosetting epoxy resin composition with the surface of another heat-stable substrate S2, in particular a metal; γ) heating the epoxy resin composition to a temperature of 100 to 130 ⁰ C, preferably from 115 to 125 ° C; δ) bringing the substrates S1 and S2 and the heat-curing epoxy resin composition in contact therewith with a washing liquid at a temperature between 20 and 100 ⁰ C, in particular between 40 and 70 ⁰ C; preferably between 50 and

70 ° C; ε) heating the composition to a temperature of 140 -

220 ⁰ C, in particular from 140 to 200 ° C, preferably between 160 and 190 ° C; wherein the substrate S2 is made of the same or a different material as the substrate S1.

14. Use of a one-component thermosetting Epoxidharzzusammenam- composition according to one of the claims according to one of the claims

10 to 12 as a thermosetting one-component carcass adhesive in vehicle construction.

15. Use of an amphiphilic block copolymer having at least one hydroxyl group, for the production of impact modifiers having carboxylic acid group (s), in particular of impact modifiers comprising carboxylic acid group (s) according to one of claims 1 - 9.