Aqueous reactive putty (I)

Details Aqueous reactive putty (I) Aqueous reactive putty (I)

2001-06-14

2004-03-16

Reddick, Judy M. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C523S201000, C524S591000, C428S424200, C428S424400, C428S424800

Reexamination Certificate

active

06706801

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to aqueous reactive 2-component binder combinations for aqueous reactive filler compositions, processes for the preparation of aqueous reactive filler compositions based on aqueous reactive 2-component binder combinations and the use of such filler compositions.
Unsaturated polyester resins as binders for filler compositions have been known for a long time. However, such products comprise relatively large amounts of reactive, volatile solvents, preferably styrene, as copolymerizable monomers. There has been no lack of attempts to develop binders based on unsaturated polyesters which have such a low viscosity that they can accommodate the large amounts of filler substances characteristic of filler compositions and, in spite of low molecular weights, can be hardened with the aid of peroxides in the absence of copolymerizable monomers to give non-tacky filler compositions. An example which may be mentioned here is EP-A 154 924, in which polyesters based on unsaturated dicarboxylic acids, diols and allyl ethers which can be formulated to filler compositions without reactive volatile solvents are claimed. On account of the reactivity being too low or the curing being too slow for a number of applications, and because of the expensive preparation of the raw materials (high raw materials cost), these and similar systems have so far not been able to find acceptance in the market. Aqueous one-component filler compositions are likewise known, but such products do not have the required level of properties for many areas of application.
There is therefore still the object of providing raw materials or binder combinations for filler compositions which can be formulated in a stable manner without the use of reactive, volatile solvents and using the high to very high amounts of filler substances characteristic of filler compositions, and can be cured in times relevant in practice to give high-quality filler compositions which can also be used in very thick layers up into the centimeter range. Other important requirements of new binder combinations for filler compositions are a rapid sandability, a specific filling consistency which is absolutely essential for proper processing, a high hardness with simultaneously adequate flexibility, a high filling power, a good adhesion to various substrates, a very good overpaintability with various paint systems, and good resistance properties.
Other important requirements of modern filler compositions are a lowest possible content of volatile organic substances (environment-friendliness), and a high variability (broad applicability), i.e. the possibility of being able to formulate, on the basis of suitable binder combinations by choice of corresponding raw materials, additives, filler substances and pigments, both very highly reactive filler compositions, with then a relatively short processing time, and also filler compositions with a longer processing time and nevertheless a good reactivity.
SUMMARY OF THE INVENTION
Surprisingly, it has now been found that aqueous reactive 2-component binder combinations for aqueous reactive filler compositions comprising
a) at least one copolymer present in an aqueous dispersion or emulsion and
b) at least one polyisocyanate containing free isocyanate groups, arcapable of meeting the abovementioned requirements.
The binder combinations according to the invention and the filler compositions prepared therefrom comprise only small amounts of volatile organic constituents and have a wide variability in respect of the reactivity By suitable choice of the raw materials, it is furthermore possible to prepare light-fast filler compositions which show practically no yellowing or chalking or discoloration in the conventional areas of application of filler compositions.
DETAILED DESCRIPTION OF THE INVENTION
The invention also provides aqueous reactive 2-component binder combinations for aqueous reactive filler compositions comprising
a) at least one copolymer, present in an aqueous dispersion and/or emulsion, comprising
a1) 35 to 95 wt. % of hardening monomers,
a2) 0 to 50 wt. % of plasticizing monomers,
a3) 0 to 50 wt. % of hydroxy-functional monomers,
a4) 0 to 6 wt. % of acid-functional monomers, which can optionally be present in part or completely in the neutralized form,
a5) 0 to 25 wt. % of other monomers and
b) at least one polyisocyanate which contains free isocyanate groups and has a viscosity of 10 to 20,000 mPas/23° C. and a functionality of 1.5 to 7.5,
the sum of the % figures of a1) to a5) being 100.
The invention preferably provides aqueous reactive 2-component binder combinations for aqueous reactive filler compositions according to claim 1 comprising
a) at least one aqueous emulsion copolymer with a molecular weight of >50,000 g/mol, comprising
a1) 40 to 90 wt. % of hardening monomers,
a2) 0 to 50 wt. % of plasticizing monomers,
a3) 0 to 40 wt. % of hydroxy-functional monomers,
a4) 0.5 to 5 wt. % of acid-functional monomers, which can optionally be present in part or completely in the neutralized form,
a5) 0 to 15 wt. % of other monomers and
b) at least one polyisocyanate which contains free isocyanate groups and has a viscosity of 10 to 20,000 mPas/23° C. and a functionality of 2 to 6,
the sum of the % figures of a1) to a5) being 100.
The invention particularly preferably provides aqueous reactive 2-component binder combinations for aqueous reactive filler compositions comprising
a) at least one emulsion copolymer which contains isocyanate-reactive groups and has a molecular weight of >50,000 g/mol, comprising
a1) 50 to 85 wt. % of hardening monomers,
a2) 5 to 30 wt. % of plasticizing monomers,
a3) 2 to 30 wt. % of hydroxy-functional monomers,
a4) 1 to 4 wt. % of carboxyl- and/or carboxylate-functional monomers and
b) at least one polyisocyanate which contains free isocyanate groups and has a viscosity of 10 to 10,000 mPas/23° C. and a functionality of 2.4 to 5.5,
the sum of the % figures of a1) to a4) being 100.
The aqueous reactive filler compositions according to the invention comprise
a) at least one copolymer present in an aqueous dispersion or emulsion,
b) at least one polyisocyanate which contains free isocyanate groups and has a viscosity of 10 to 20,000 mPas/23° C. and a functionality of 1.5 to 7.5,
c) at least one pigment and/or filler,
d) optionally auxiliary substances and additives,
e) optionally further oligomers or polymers present in the form of an aqueous solution, dispersion or emulsion and
f) optionally water and/or an organic solvent,
the weight ratio of resin (solid from component a), from component b) and optionally from component e)) to pigment/filler (solid from component c)) being 1:1.3 to 1:20.
The invention also provides aqueous reactive filler compositions comprising
a) 10 to 50 wt. % of at least one emulsion copolymer,
b) 1 to 15 wt. % of at least one polyisocyanate which contains free isocyanate groups and has a viscosity of 10 to 20,000 mPas/23° C. and a functionality of 2 to 6,
c) 40 to 90 wt. % of at least one pigment and/or filler,
d) 0 to 3 wt. % of auxiliary substances, additional substances and/or additives,
e) 0 to 50 wt. % of further oligomers or polymers optionally present in the form of an aqueous solution, dispersion or emulsion and
f) 0 to 20 wt. % of water and/or organic solvents,
the sum of a) to f) being 100 wt. % and the weight ratio of resin (solid from component a), from component b) and optionally from component e)) to pigment/filler (solid from component c)) being 1:1.5 to 1:15.
The invention also preferably provides aqueous reactive filler compositions comprising
a) 10 to 50 wt. % of at least one polymerized-in emulsion copolymer, comprising
a1) 35 to 95 wt. % of hardening monomers,
a2) 0 to 50 wt. % of plasticizing monomers,
a3) 0 to 50 wt. % of hydroxy-functional monomers,
a4) 0 to 6 wt. % of acid-functional monomers, which can optionally be present in part or completely in the neutralized form,
a5) 0 to 25 wt. % of other monomers and
b) 1 to 9.8 wt. % of at least one polyisocyanate which contains free

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