WO2014033090A1

WO2014033090A1 - Oxazoline resins

Info

Publication number: WO2014033090A1
Application number: PCT/EP2013/067633
Authority: WO
Inventors: Nigel Fay; Pablo Walter; Emilie Barriau; Rainer SCHÖNFELD; Damien FOURCADE; Rolf Mülhaupt
Original assignee: Henkel Ag & Co. Kgaa
Priority date: 2012-08-30
Filing date: 2013-08-26
Publication date: 2014-03-06
Also published as: DE102012215425A1

Abstract

A method is described for producing fibre composite components that involves bringing a curable reactive resin system to a temperature in the range of 50-100°C, applying said system to a fibre product, and thereafter causing the resin to cure by raising the temperature to temperatures > 130°C, preferably > 150°C, and also, furthermore, a method is described for producing components, that involves bringing a curable reactive resin system to a temperature in the range of 50-100°C, introducing said system into a mould, and thereafter causing the resin to cure by raising the temperature to temperatures > 130°C, preferably > 150°C. The curable reactive resin system employed here comprises (a) at least one optionally substituted 2-oxazoline, and also, furthermore, (b) at least one substituted 2‑oxazoline having at least one additional 2 oxazoline group and/or at least one substituted benzoxazine having at least one additional benzoxazine group, and also, (c) at least one initiator.

Description

oxazoline

The present invention is in the field of reactive resins. In particular, it relates to such reaction resins comprising 2-oxazolines.

Common reaction resins include epoxy resins. These are used successfully and safely by industry in many areas, e.g. as casting resins, in toolmaking or in construction. However, there is a continuing need to establish other resin systems as an alternative to epoxy resins. On the one hand, this is due to the fundamental desire to increase the variability in the choice of materials, but on the other hand concerns are repeatedly raised regarding a possible toxicity and possible irritative properties of epoxy resins, which would possibly be due to residual monomers or unreacted curing agents which were not co-polymerized.

Against this background, the present invention has the object, a

Provide method for the production of components, in particular of fiber composite components, in which can be at least largely dispensed with the use of epoxy resins.

It could be found surprising in the context of the present invention that certain

Reaction resin systems comprising 2-oxazolines, particularly well suited for the manufacture of components, as potting compound for electronic components and for processing with

Fiber materials, such as preferably glass, carbon and / or aramid fibers, whose layers and / or fabrics, preferably for the production of fiber composite components, are suitable.

Against this background, a first subject of the present invention is a method for producing components, in particular in the electronics sector, comprising a curable reaction resin system

(a) at least one optionally substituted 2-oxazoline, and continue

(b) at least one substituted 2-oxazoline having at least one additional 2-oxazoline group and / or at least one substituted benzoxazine having at least one additional benzoxazine group,

such as (c) at least one initiator,

is brought to a temperature in the range of 50-100 ° C, placed in a mold, preferably poured, pumped under vacuum or pressed under pressure, and then a curing of the resin by increasing the temperature to temperatures> 130 ° C, preferably> 150 ° C is effected.

A second object of the present invention is a process for producing fiber composite components comprising a curable reaction resin system

(a) at least one optionally substituted 2-oxazoline, and continue

(b) at least one substituted 2-oxazoline having at least one additional 2-oxazoline group and / or at least one substituted benzoxazine having at least one additional benzoxazine group, and

(c) at least one initiator.

is brought to a temperature in the range of 50-100 ° C is added to a fiber product, preferably poured, pumped under vacuum or pressed under pressure, and then a curing of the resin by increasing the temperature to temperatures> 130 ° C, preferably> 150 ° C is effected.

The present invention has several advantages. The curable reaction resin systems to be used according to the invention are highly stable on storage at room temperature (20 ° C.) and even at elevated temperatures (for example 40 ° C.) and can be prefabricated as one-component systems to give ready-to-use mixtures. They allow use at higher temperatures, as they can be used at temperatures in the range of e.g. 70 ° C up to 120 ° C (depending on the type and amount of the initiator) in liquid form in stable form and only (depending on the nature and amount of the initiator) at higher temperatures, e.g. > Harden 130 ° C. The reaction resin systems according to the invention can cure extremely quickly; they can harden almost completely within a few minutes up to the second range. In the temperature range of e.g. 70 ° C to 120 ° C, the reaction resin systems also have a particularly low viscosity, so that they can be processed very easily. Therefore, they are particularly well suited for the inventive production of components as well as for the inventive production of fiber composite components and in particular as an infusion resin, casting resin, impregnating resin and impregnating resin

used. Another advantage of the invention lies in the fact that, if desired, the use of epoxy resins or other potentially toxicologically questionable ingredients can be largely dispensed with entirely. The components resulting from the curing of the reaction resin systems to be used according to the invention and fiber composite components include polymer materials which are firmly cross-linked in three dimensions. These are distinguished high glass transition temperatures, preferably in the range> 135 ° C and show excellent stiffness / toughness properties that have a positive effect on the performance characteristics of the resulting components and fiber composite components. This is a particular advantage since the use of polymer materials which show a high level of stiff and at the same time tough material behavior is of great importance for the development of new components and fiber composite components. In addition, the resulting polymers have a particularly low water absorption, which also has a positive effect on the application properties of the resulting components and fiber composite components. This overall particularly favorable material behavior is also surprising insofar as resins based on bisoxazolines usually lead to brittle, brittle polymers. Another disadvantage of such resins are usually very high

Processing and curing temperatures. In addition, in most such systems sufficient storage stability is not given. Resins based on mono-oxazolines are also subject to reservations, since the use of commercially available mono-oxazolines has disadvantages in that they are difficult to process and are not storage-stable at room temperature, which is, i.a. to a low boiling point

is due. However, the reaction resin systems to be used according to the invention do not show all of these disadvantages.

The reaction resins may e.g. also include fillers, possibly even in very large quantities. Especially in solids highly filled with resins, a press can be used by means of hydraulic cylinders.

In the context of the present invention, those to be used include

Reaction resin systems at least two different monomers, namely (a) at least one optionally substituted 2-oxazoline, and furthermore (b) at least one substituted 2-oxazoline with at least one additional 2-oxazoline group and / or at least one substituted benzoxazine with at least one additional benzoxazine Group,

Oxazolines are known per se. The 2-oxazoline is a cyclic imino ether having the following

/ \

Basic structure: ° \ ^N.

According to the invention, a substituted 2-oxazoline is preferably used. The 2-oxazoline may be monosubstituted or polysubstituted. The 2-oxazoline may be substituted in both position 2 and in positions 4 and / or 5. Possible substituents in positions 4 and / or 5 may be alkyl groups, eg CH ₃ - or C ₂ H ₅ -, or Phenyl, ie C ₆ H ₅ -. Both alkyl and phenyl groups may contain heteroatoms preferably S, O or N.

However, it is preferred that the 2-oxazoline is unsubstituted in positions 4 and 5. In particular, however, the 2-oxazoline is substituted in position 2 according to the following

general formula:

, The selection of the substituent R in this general formula is in principle not limited, for example, it may be any aliphatic, aromatic or araliphatic radical having preferably 1 to 36 carbon atoms, in particular it is preferred that the 2-oxazoline in position 2 is substituted with an alkyl, alkene, alkyne, aryl, siloxane or silicone group or combinations of such groups. The substituents, in particular the alkyl, alkene or alkyne group, may be linear or branched. The alkyl group, like the alkene or alkyne group, may preferably have 1-36 carbon atoms. Also, the alkyl group may include a cycloalkyl group. An aryl group is an organic radical having an aromatic backbone. Preferred aryl radicals are derived from benzene. Particularly preferred is the phenyl group, (-C ₆ H ₅ ). Likewise, the substituents may be linear or branched polymers which, moreover, have no or at least one additional functionality. Also suitable as substituent R are combinations of alkyl radicals and aryl radicals, a preferred example of which is the benzyl radical (-CH ₂ - C ₆ H ₅ ). Both the alkyl groups and the aryl groups can be characterized by being not insignificantly functionalized and / or partially heteroatoms,

preferably S, O or N.

Siloxanes are the oxygen compounds of silicon, which are characterized by having at least one siloxane group (Si-O). Polysiloxanes, here encompassed by the term siloxane, are compounds of the general formula [0-Si] _n where n> 3. In addition, they may be substituted by organic radicals or halogen atoms.

Silicones are understood as meaning synthetic compounds in which silicon atoms are not or only partially linked via oxygen atoms. The linkage is preferably carried out by alkyl groups and / or aryl groups.

A particularly preferred substituted 2-oxazoline in the context of this invention is 2- (p-tolyl) -2-oxazoline. Also particularly preferred are 2- (3,5-dimethylphenyl) -4,5-dihydrooxazole and 4,5-dihydro-2- (4-methoxyphenyl) oxazole and 4,5-dihydro-2- (4-methylphenyl ) - oxazole. 4,5-dihydrooxazole is the alternative name for 2-oxazoline. In the context of the present invention, it is necessary to use at least one optionally substituted 2-oxazoline as component (a). Based on the total amount of the resin system to be used according to the invention, the total amount is optionally

Substituted 2-oxazoline advantageously in the range of 10 to 90 wt .-%, preferably from 20 to 70 wt .-%, in particular from 60 to 70 wt .-%. It should be noted in the context of this invention that substituted 2-oxazolines, which are connected to at least one additional 2-oxazoline group, as well as substituted benzoxazines, which are connected to at least one additional benzoxazine group, not included in this quantitative calculation. These are considered within the meaning of the invention as a separate component (b).

In addition to optionally substituted 2-oxazoline, the reaction resin system to be used according to the invention contains as second compelling constituent (b) at least one substituted 2-oxazoline with at least one additional 2-oxazoline group and / or at least one substituted benzoxazine with at least one additional benzoxazine group.

The component 2 (b) substituted 2-oxazoline is associated with at least one additional 2-oxazoline group. In this respect, therefore, this 2-oxazoline bears at least one substituent, namely a further 2-oxazoline group. The substituted 2-oxazoline having at least one additional 2-oxazoline group is preferably a bis (2-oxazoline) according to the following general structure, wherein R is preferably an alkyl- (linear or branched, preferably 1) bridging the oxazolines to 36 carbon atoms, optionally substituted), aryl, siloxane and / or silicone radical:

, The unsubstituted in this general formula carbon atoms, may be substituted by this formula also be substituted, for example, be substituted with alkyl groups, for example with CH ₃ - or C ₂ H ₅ -, or phenyl, ie C ₆ H ₅ -. However, it is preferred that the respective carbon atoms are unsubstituted, as shown in the general formula. Particularly preferred bis (2-oxazolines) are bridged via a phenylene group. Thus, it corresponds to a preferred embodiment of the invention, when the reaction resin to be used according to the invention comprises a bis (2-oxazoline), preferably selected from 1, 3, 1, 2 and / or 1, 4-phenylenebis (2-oxazoline). Another example of a Bisoxazoline which can be used according to the invention is tetramethylenebis (2-oxazoline). In principle, tris- and tetrakis (2-oxazolines) can also be used.

Substituted benzoxazine with at least one additional benzoxazine group can also be used as component (b). Benzoxazines as such are well known to those skilled in the art and are compounds of the following general formula:

, The selection of the substituents R1, R2, R3, R4 in this general

In principle, there are no restrictions on the formula, for example the substituents, independently of one another, may be hydrogen, any desired aliphatic, aromatic or araliphatic radical preferably having 1 to 36 carbon atoms, in particular it is preferred that the benzoxazine is reacted with alkyl , Alkene, alkyne, aryl, siloxane or silicone groups or combinations of such groups. The substituents, in particular the alkyl, alkene or alkyne group, may be linear or branched. The alkyl group, like the alkene or alkyne group, may preferably have 1 -36 C atoms. Also, the alkyl group may include a cycloalkyl group. Particularly preferred is the phenyl group, (-C ₆ H ₅ ). Likewise, the substituents may be linear or branched polymers which, moreover, have no or at least one additional functionality. Also suitable as substituents are combinations of alkyl radicals and aryl radicals, a preferred example of which is the benzyl radical (-CH ₂ - C ₆ H ₅ ). Both the alkyl groups and the aryl groups can be characterized by being not insignificantly functionalized and / or partially heteroatoms,

preferably S, O or N. R1 and R2 are each in particular a hydrogen radical. The substituted benzoxazine usable according to the invention is associated with at least one additional benzoxazine group. In that sense, that contributes

Benzoxazine thus at least one substituent, namely a further benzoxazine group. It is preferred that the benzoxazine is linked to another benzoxazine group via either R4 or R2. When the benzoxazine is connected to another benzoxazine group via the radical R4, then R2 is preferably a hydrogen radical.

A preferred example of substituted benzoxazine having at least one additional benzoxazine group is shown in the following formula:

, In this formula, R4 preferably represents an alkyl (linear or branched, preferably 1 to 36 C atoms bridging the benzoxazines, if appropriate

substituted; for example, a tetramethylene group - [CH ₂ ] 4-), aryl, siloxane and / or silicone radical. Particularly preferred benzoxazines are linked together via a phenylene group or an alkyl group, such as a tetramethylene group.

Another preferred example of substituted benzoxazine having at least one additional benzoxazine group is shown in the following formula:

In this formula, R 2 in this formula preferably represents a

Benzoxazine bridging alkyl (linear or branched, preferably 1 to 36 carbon atoms, optionally substituted, eg a tetramethylene group - [CH ₂ ] 4-), aryl, siloxane and / or silicone radical; particularly preferred benzoxazines are linked together via a phenylene group or an alkyl group, such as a tetramethylene group; R4 in this formula is preferably a hydrogen, alkyl (linear or branched, preferably 1 to 36 C atoms, optionally substituted), aryl, siloxane and / or silicone radical.

Based on the entire resin system to be used according to the invention is the

Total amount of component (b), ie substituted 2-oxazoline having at least one additional 2-oxazoline group, preferably bis (2-oxazoline), and / or substituted benzoxazine with at least one additional benzoxazine group, advantageously in the range of 10 to 90, preferably 20 to 70 wt .-%, in particular 30 to 40 wt .-%.

Advantageously, components (a) and (b) are in an equivalent ratio of 80:20 to 20:80, preferably 70:30 to 30:70, especially 60:40 to 40:60, the equivalent weight here being the molecular weight divided by the number of oxazoline groups or benzoxazine groups present in the molecule is understood. As the third obligatory component (c), the curable resin system to be used in the present invention contains at least one initiator. In principle, any initiator which is capable of initiating a polymerization involving the abovementioned oxazolines can be used as the initiator.

Preferably, as initiator Lewis acids, protic acids, esters of protic acids and / or salts of protic acids can be used. Furthermore, can be used as initiators alkyl, aryl, acyl halides, elemental iodine or oxonium salts. Furthermore, the initiator may be a functionalized polymer,

preferably a polymer containing at least one protic acid, a

Proton acid ester or a 2-oxazolinium is functionalized. This corresponds to a preferred embodiment of the invention. An example of such a polymer is a tosylated hyperbranched polyoxetane, in particular the following:

where Ts is -SC ^ -Cel-U-CHs.

In particular, the initiator used in the curable resin system to be used according to the invention may contain a salt of a protic acid, preferably an amine salt, advantageously an amine salt of a secondary amine. This also corresponds to one preferred embodiment of the invention. A preferred example of this is the

Diethylamine salt of trifluoromethanesulfonic acid.

It is particularly preferred that the curable resin system to be used according to the invention contains as initiator a protic acid ester, preferably selected from the group comprising methyl toluenesulfonate, trifluorosulfonic acid methyl ester and / or

Methanesulfonate.

According to a preferred embodiment of the invention, the initiator is in one

Total amount of 0.0001 to 30 wt .-%, preferably from 0.01 to 20 wt .-%, in particular from 0.01 to 2 wt .-%, based on the curable resin system to be used.

An advantage of the present invention is that when using the curable resin system according to the invention, the use of epoxy resins can be wholly or substantially avoided, if desired, as desired.

Thus, it corresponds to a preferred embodiment of the invention that the

Advantageously, the reaction resin to be used according to the invention comprises less than 50% by weight of an epoxy resin. Epoxy resins are monomeric, oligomeric or polymeric compounds having at least one epoxide group, preferably at least two epoxide groups per molecule, which can be used in particular for the production of thermosets as well as the corresponding thermosets themselves.

In a preferred embodiment of the invention, the reaction resin to be used according to the invention may advantageously be less than 30% by weight, preferably less than 20% by weight, advantageously less than 10% by weight, in particular less than 5% by weight, e.g. contain less than 1 wt .-% or 0.5 wt .-% epoxides, in particular even completely free of epoxide. The term epoxides is known to the person skilled in the art. It refers to a group of reactive organic compounds containing the epoxide moiety, a tripartite, oxygen-containing heterocycle, such as e.g. the epichlorohydrin.

The reaction resin to be used according to the invention can be heated at temperatures up to

In particular, be processed <1 10 ° C, without curing of the system takes place. Depending on the mixing ratio of components a) and b) and the presence of further optional constituents of the reaction resin, this is solid or liquid at room temperature, but usually firm. If it is in solid form at room temperature, it can be liquefied by heating. In a temperature range of preferably 50-100 ° C., in particular 70 ° C. to 100 ° C., the reaction resin to be used according to the invention is present in liquid form, is stable and can be processed in this temperature range, for example poured into open molds and, for example, without Application of pressure by increasing the temperature to temperatures> 130 ° C to be cured.

The reaction resin to be used according to the invention can be cured in particular at temperatures of> 130 ° C. to <180 ° C. in a period of advantageously <600 seconds, preferably <300 seconds, in particular <100 seconds, and has sufficient dimensional stability. When hardened, the skilled person understands in particular a resin which has a DSC determined by Restexothermie of a maximum of 20% of the origin of exothermic. As dimensionally stable in this context, in particular those materials are referred to, which have a glass transition temperature above room temperature and preferably also have a sufficient Shore D hardness.

Within the scope of a preferred embodiment of the invention, the reaction resin to be used according to the invention may also comprise at least one further resin system in addition to the previously described resin system. Suitable resin systems are in particular acrylate resins, methacrylate resins, alcohol / isocyanate resins, epoxy / amine resins,

Maleimide resins, anhydride resins.

Suitable ranges in which further resin system may be present are in the range of 1 to 95 wt .-%, preferably from 1 to 70 wt .-%, in particular from 1 to 50 wt .-%, wt .-%, based on the entire reaction resin.

According to a preferred embodiment of the invention, the second resin system can react independently of the oxazoline resin system to be used according to the invention.

In this context, "reacting depending on the oxazoline resin system according to the invention" means, in particular, that the second resin system either hardens under the same curing conditions, reacts with the ring-opened 2-oxazoline and reacts with the same initiators, in which "reacting independently of the oxazoline resin system according to the invention" means that the second resin system by means of another

Cures reaction mechanism, thereby creating two independent polymer networks. These networks are characterized in that they only partially or preferably are not chemically bonded together. The independent reaction can be achieved preferably by the second resin system among others

Reaction conditions cures, be it by means of irradiation such as UV rays or at low reaction temperatures. To prevent a premature reaction, the systems can also be stored spatially separated from each other. The dependent reaction is always present when the second system hardens under the same curing conditions.

The Reaktionsharzusystem invention can in addition to the previously mentioned

Components preferably also include other components, which in

Reaction resin systems can be used. These include in particular

Impact modifiers, fillers, primers, rheology modifiers and / or blowing agents. Such components are familiar to the person skilled in the art and can be assembled as required from the known state of the art.

In particular, fillers may also be present in large quantities.

Another object of the present invention is the use of a curable reaction resin system as described above

(a) at least one optionally substituted 2-oxazoline, and continue

(c) at least one initiator,

as an infusion resin, in particular for processing with fiber materials, such as preferably glass, carbon and / or aramid fibers, their layers and / or fabrics,

preferably for the production of fiber composite components.

(a) at least one optionally substituted 2-oxazoline, and continue

(c) at least one initiator,

as impregnating resin for the consolidation of porous and / or absorbent materials, in particular paper, nonwovens, fabric or wood. Another object of the present invention is the use of a curable reaction resin system as described above

(a) at least one optionally substituted 2-oxazoline, and continue

(c) at least one initiator.

as a resin system for components, in particular electronic components, or as a potting compound for electronic components.

Relative to the above-mentioned uses, it is advantageous

Embodiments of the curable reaction resin system used on the

referenced description.

Examples

example 1

0.6 equivalents of 2- (p-tolyl) -2-oxazoline ^# (CAS ^# 10200-70-1) and 0.4 equivalents of 1,3-phenylene bisoxazoline (CAS # 34052-90-9) were placed in a round bottom flask. The equivalents were calculated for the oxazoline equivalent weight (OEW in g / mol), which is calculated as the quotient of the molecular weight and the number of oxazoline groups. The oxazoline equivalent weight of 2- (p-tolyl) -2-oxazoline is 161 g / mol, the equivalent weight of the 1,3-phenylene bisoxazoline is 108 g / mol. The mixture was heated under N ₂ -Atmophäre for 15 minutes at 100 ° C. Subsequently, 0.5% by weight of methyl p-touolsulfonate was added and stirred for 15 seconds. The amount of methyl p-touolsulfonate is calculated on the total weight of 2- (p-tolyl) -2-oxazoline and 1, 3-phenylene bisoxazoline used. Thereafter, the mixture was poured into a mold preheated in the oven and oven-baked at 180 ° C for 15 minutes.

^# 2- (p-Tolyl) -2-oxazoline was previously synthesized according to literature procedure (PB M Beck, U. Eicken, H. Fischer, WE Fristad, B. Hase, HJ Krause, Applied Macromolecular Chemistry 1994, 223, 217) ,

The cured end product was characterized as follows:

The samples of the final product were first mechanically comminuted.

Tensile strength measurements were carried out under the standard ISO 527-2 / 1 BA / 1. Dynamic thermomechanical analysis was performed under the following conditions: Instrument: TA Instruments Q800 / Dual Cantilver Configuration

Sample dimensions: 35.00 mm x 4.28 mm x 2.63 mm

Frequency: 1 Hz Deformation: 0, 1%

Temperature program 25 ° C to 250 ° C with a heating rate of 3 ° C per minute T _g was determined from the beginning of the falling memory module (Ε ').

Conditions for the tensile test:

Device: Zwick Z005, equipped with pneumatic clamping devices of 2.5 kN.

Sample sizing in accordance with ISO 527-2 / 1 BA.

Speed: 1 mm / min

4 samples measured Results:

Youngs Modulus: 4025 ± 68 (MPa)

Break Elongation: 1, 77 ± 0.22%

Yield strongly: 28.55 ± 3.77 MPa

T _g : 138 ° C

Example 2:

0.5 equivalent of 2- (p-tolyl) -2-oxazoline (CAS # 10200-70-1) and 0.5 equivalent of 1, 3-phenylene bisoxazoline were added with 0.5 weight percent methyl-p Touolsulfonat analogous to

Specifications implemented in Example 1.

The characterization was carried out analogously to Example 1 and gave the following results for the final product.

Results:

Youngs Modulus: 4389 ± 71 (MPa)

Break Elongation: 3.05 ± 0.67%

Yield strongly: 52.43 ± 1 1, 95 MPa

T _g : 151 ° C

Example 3:

For the purpose of gel time analysis, in Example 3a, 0.6 equivalents of 2- (p-tolyl) -2-oxazoline (CAS # 10200-70-1) and 0.4 equivalent of 1, 3-phenylene bisoxazoline with 0.5 % By weight or 2% by weight (see Table 1) of methyl p-touolsulfonate.

In Example 3b, 0.6 equivalents of 2- (p-tolyl) -2-oxazoline (CAS # 10200-70-1) and 0.4 equivalent of 0.5% by weight of 1,3-phenylene bisoxazoline were added. or 2% by weight (see Table 1) of Nacure® Super A233 (diethylamine salt of trifluoromethanesulfonic acid).

For this purpose, in each case both monomers were weighed into a round-bottomed flask, the mixture stirred under N ₂ atmosphere for 15 minutes at 100 ° C to 180 ° C (see Table 1), the mixture was then placed in a suitably preheated test tube, then the cationic Initiator (Example 3a: methyl p-touolsulfonate; Example 3b: Nacure® Super A233) was added and the measurement started (temperature see Table 1).

The Gelierzeituntersuchung carried out with a Geltimer of GELNORM®.

The results are given in Table 1 below. Table 1 :

Experimental conditions Gelling time

T (° C) amount of the cationic methyl p-touolsulfonate Nacure®

Initiator (% by weight) Super A233

100 0.5 59 to 107 min. »36 hours

120 0.5 1 1 min. 73 min.

140 2 3 min. 17 min.

160 0.5 3 min. 6 min.

160 2 2 min. 2 min.

180 0.5 1 min. 30 sec. 3 min.

180 2 30 sec. 1 min.

Example 4:

The reaction resin systems according to Examples 1 and 2 were used in a process for the production of fiber composite components, wherein the curable

Reactive resin system

was brought to a temperature in the range of 90 ° C was poured onto a fiber product of aramid fibers, and then hardening of the resin by

Temperature increase to temperatures> 130 ° C was effected. The result was a fiber composite component with excellent material properties, in particular excellent rigidity / toughness properties.

Claims

claims

1. A process for the production of fiber composite components in which a curable

Reaction resin system comprising

(a) at least one optionally substituted 2-oxazoline, and continue

(c) at least one initiator,

2. A process for the production of components, in particular in the electronics sector, comprising a curable reaction resin system

(a) at least one optionally substituted 2-oxazoline, and continue

(c) at least one initiator,

3. The method according to claim 1 or 2, characterized in that the initiator used Lewis acids, protic acids, esters of protic acids, salts of

Proton acids and / or polymer, which preferably with at least one

Proton acid, a proton acid ester or a 2-oxazoline is functionalized comprises.

4. The method according to any one of claims 1 to 3, characterized in that the reaction resin system used comprises less than 50 wt .-% of an epoxy resin.

5. The method according to any one of claims 1 to 4, characterized in that in the reaction resin system used as component (b) is a bis (2-oxazoline) containing, preferably selected from the group comprising 1, 3, 1, 2 and / or 1, 4-phenylenebis (2-oxazoline).

6. The method according to any one of claims 1 to 5, characterized in that the optionally substituted 2-oxazoline contained in the reaction resin system used in a

Total amount of 10 to 90 wt .-%, preferably from 30 to 70 wt .-%, in particular from 60 to 70 wt .-%, based on the total reaction resin system.

7. The method according to any one of claims 1 to 6, characterized in that the contained in the reaction resin system substituted 2-oxazoline, which with at least one additional 2-oxazoline group and / or substituted benzoxazine, with at least one additional benzoxazine group is contained in a total amount of 10 to 90 wt .-%, preferably 30 to 70 wt .-%, in particular 30 to 40 wt .-%, based on the total reaction resin system.

8. The method according to claims 1 to 7, additionally characterized in that in the reaction resin system used at least one further resin system is contained, which a) depending or b) can react independently of the resin system according to claims 1 to 12.

9. Use of a curable reaction resin system comprising

(a) at least one optionally substituted 2-oxazoline, and continue

(c) at least one initiator,

preferably for the production of fiber composite components.

10. Use of a curable reaction resin system comprising

(a) at least one optionally substituted 2-oxazoline, and continue

(c) at least one initiator,

as impregnating resin for the consolidation of porous and / or absorbent materials, in particular paper, nonwovens, fabric or wood.

1 1. Use of a curable reaction resin system comprising

(a) at least one optionally substituted 2-oxazoline, and continue

(c) at least one initiator.

as a resin system for components or as a potting compound for electronic components.