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...
Reexamination Certificate
2001-06-14
2003-05-13
Cain, Edward J. (Department: 1714)
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...
C524S591000
Reexamination Certificate
active
06562894
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 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. Because the reactivity is too low or the curing is too slow for a number of applications, and because of the 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 filler 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 low content of volatile organic substances (environment-friendliness), and 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, filler compositions with a long processing time and nevertheless a good reactivity.
Surprisingly, it has now been found that aqueous reactive 2-component binder combinations for aqueous reactive filler compositions comprising at least one polyurethane or polyurethane-polyurea dispersion and at least one polyisocyanate containing free isocyanate groups are capable of meeting the abovementioned requirements. The binder combinations according to the invention and the filler compositions prepared therefrom comprise only small amounts of volatile constituents. By suitable choice of the raw materials, it is possible to prepare filler compositions which show practically no yellowing or chalking or discoloration, and it is also possible to formulate filler compositions which combine a long processing time and good reactivity.
SUMMARY OF THE INVENTION
The invention thus provides aqueous reactive 2-component binder combinations for aqueous reactive filler compositions comprising
a) at least one polyurethane or polyurethane-polyurea dispersion and
b) at least one polyisocyanate containing free isocyanate groups.
The invention also provides aqueous reactive 2-component binder combinations for aqueous reactive filler compositions comprising
a) at least one polyurethane or polyurethane-polyurea dispersion comprising the reaction product of
a1) at least one polyol component,
a2) at least one di- and/or polyisocyanate component,
a3) at least one (potentially) ionic compound with at least one group which is capable of salt formation and optionally at least partly present in the neutralized form and at least one group which is reactive towards isocyanate groups, and optionally a hydrophilic, nonionic compound, comprising compounds with at least one group which is reactive towards isocyanate groups and at least one hydrophilic polyether chain,
a4) at least one mono-, di- and/or polyfunctional low molecular weight builder component of the molecular weight range 32 to 450 which differs from a1) to a3),
component(s) a3) being employed in an amount such that a stable dispersion is formed, 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.
DETAILED DESCRIPTION OF THE INVENTION
The invention preferably provides aqueous reactive 2-component binder combinations for aqueous reactive filler compositions comprising
a) at least one polyurethane or polyurethane-polyurea dispersion comprising the reaction product of
a1) 35 to 85 wt. % of at least one polyol component,
a2) 5 to 50 wt. % of at least one di- and/or polyisocyanate component,
a3) 1.5 to 10 wt. % of at least one (potentially) ionic compound with at least one group which is capable of salt formation and optionally at least partly present in the neutralized form and at least one group which is reactive towards isocyanate groups, and optionally a hydrophilic, nonionic compound, comprising compounds with at least one group which is reactive towards isocyanate groups and at least one hydrophilic polyether chain,
a4) 1 to 10 wt. % of at least one mono-, di- and/or polyfunctional low molecular weight builder component of the molecular weight range 32 to 450 which differs from a1) to a3),
component(s) a3) being employed in an amount such that a stable dispersion is formed, 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 2.15 to 5.0,
the sum of the % figures of a1) to a4) being 100.
The invention particularly preferably provides aqueous reactive 2-component binder combinations for aqueous reactive filler compositions comprising
a) at least one polyurethane-polyurea dispersion comprising the reaction product of
a1) 40 to 75 wt. % of at least one di- and/or trifunctional polyester- and/or polyether-based polyol component of the molecular weight range 750 to 3,000 g/mol,
a2) 15 to 45 wt. % of at least one diisocyanate component of the molecular weight range 168 to 262,
a3) 1.5 to 8.5 wt. % of at least one (potentially) ionic compound with at least one group which is capable of salt formation and optionally at least partly present in the neutralized form and at least one group which is reactive towards isocyanate groups, and optionally a hydrophilic, nonionic compound, comprising compounds with at least one group which is reactive towards isocyanate groups and at least one hydrophilic polyether chain,
a4) 1.5 to 8 wt. % of at least one mono-, di- and/or polyfunctional low molecular weight builder component of the molecular weight range 32 to 450 which differs from a1) to a3),
component(s) a3) being employed in an amount such that a stable dispersion is formed, 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 2.15 to 5.0,
the sum of the % figures of a1) to a4) being 100.
The invention also provides aqueous reactive filler compositions comprising
a) at least one polyurethane or polyurethane-polyurea dispersion,
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
Blum Harald
Clemens Horst
Ehlers Michael
Irle Christoph
Probst Joachim
Bayer Aktiengesellschaft
Cain Edward J.
Gil Joseph C.
Roy Thomas W.
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