Coating processes – Solid particles or fibers applied – Uniting particles to form continuous coating with...
Reexamination Certificate
2002-10-04
2004-06-29
Short, Patricia A. (Department: 1712)
Coating processes
Solid particles or fibers applied
Uniting particles to form continuous coating with...
C427S385500, C427S388200, C427S393500, C525S123000, C525S127000, C525S128000, C525S934000, C528S069000, C528S073000
Reexamination Certificate
active
06756072
ABSTRACT:
This application is a National Phase of Patent Application PCT/EP01/04700 filed Apr. 26, 2001.
The present invention relates to novel multicomponent coating materials, adhesives and sealing compounds. The present invention further relates to the use of the novel multicomponent coating materials for producing novel clearcoat systems or color- and effect-imparting solid-color topcoat, basecoat and multicoat systems in the OEM finishing and refinishing of motor vehicles, in the interior and exterior coating of constructions, in furniture, window and door coating and in industrial coating, including coil coating, container coating, and the impregnation of electrical engineering components. The present invention relates additionally to the use of the novel multicomponent adhesives and sealing compounds for producing novel adhesive films and seals, especially in the fields of use recited above.
Two-component coating materials comprising—in very general terms—reactive components having isocyanate-reactive functional groups, customary and known polyisocyanates, and adducts of diisocyanates and dioxolanes, dioxanes or oxazolidines which have an isocyanate-reactive functional group, in a molar ratio of 1:1, are known from German Patent Application DE 196 09 617 A1.
According to page 3, line 68 to page 4, line 10, said reactive components comprise, inter alia, hydroxy-functional polymers having a hydroxyl group content of from 0.1 to 20% by weight (corresponding to from 33 to 660 mg KOH/g). The number-average molecular weight of the polymers is preferably from 1000 to 100,000. The polymers contain preferably more than 50% by weight of C
1
-C
20
alkyl (meth)acrylate, vinyl aromatics having up to 20 carbon atoms, vinyl esters of carboxylic acids containing up to 20 carbon atoms, vinyl halides, nonaromatic hydrocarbons having 4 to 8 carbon atoms and 1 or 2 double bonds, unsaturated nitrites, and mixtures thereof. Preference is given to polymers containing up to 60% by weight of C
1
-C
10
alkyl (meth)acrylates, styrene, or mixtures thereof.
Furthermore, the polymers include hydroxy-functional monomers, corresponding to the above hydroxyl group content, and also other monomers, which are not specified in any greater detail, such as unsaturated acids, especially carboxylic acids, acid anhydrides, or acid amides.
According to page 9, lines 30 to 45, “Preparation and testing of the clearcoats with the compounds A—two-component system”, the hydroxy-functional vinyl polymer Lumitol® H 136 from BASF Aktiengesellschaft, having an OH number of 136 mg KOH/g, is used as the reactive component. These known clearcoats have a high solids content of up to 76% by weight. The clearcoat finishes produced from them possess good mechanical properties, in particular a high level of hardness and flexibility, and also high chemical resistance.
The two-component coating materials known from DE 196 09 617 A1 are, however, not so broadly applicable as would in fact be desirable. Moreover, there is a need to extend their pot life, that is to say the time within which, after the two components have been mixed, the coating materials can be processed without problems and give flawless coatings.
German Patent DE 197 09 467 C 2 or German Laid-Open Specification DE 197 09 465 A 1 disclose heat-curable coating materials based on hydroxyl-containing binders and crosslinking agents which comprise hydoxyl-reactive functional groups. After their curing they have a storage modulus E′ in the rubber-elastic range of at least 10
7.6
Pa and a loss factor tan &dgr; at 20° C. of not more than 0.10, the storage modulus E′ and the loss factor having been measured by means of dynamic mechanical thermoanalysis on free films having a thickness of 40±10 &mgr;m. Binders used include, inter alia, (meth)acrylate copolymers containing 4-hydroxybutyl methacrylate in a copolymerized form. The coatings produced from the known coating materials are scratch-resistant and chemical-stable. Nevertheless, it is necessary to improve further on the level of scratch resistance already obtained, for particularly demanding end uses: for example, in the OEM finishing and refinishing of particularly high-value, top-class automobiles. Furthermore, the known coatings ought to have even better polishability.
Methylpropane-1,3-diol mono(meth)acrylate and its polymers of low molecular weight are known from German Patent Application DE 32 34 045 A 1. The polymers are used to prepare light-sensitive compositions which are used for imagewise exposure. It is unknown whether they are also suitable for the production of multicomponent coating materials, adhesives or sealing compounds.
German Patent Application DE 198 50 210.9, unpublished at the priority date of the present specification, describes the use of 2-methyl-propane-1,3-diol mono(meth)acrylate to prepare (meth)acrylate copolymers. The (meth)acrylate copolymers in question are used to prepare multicomponent coating materials, adhesives and sealing compounds. The multicomponent coating materials give scratch-resistant coatings, especially clearcoats.
It is an object of the present invention to further develop the known multicomponent coating materials while losing nothing of the profile of properties already achieved so as to give new, advantageous multicomponent coating materials which have a high solids content at low viscosity and have a long pot life and which give coatings, especially clearcoat systems and color- and/or effect-imparting solid-color topcoat, basecoat and multicoat systems, which in addition to a high level of hardness, flexibility and chemical resistance also possess outstanding flowout, very good intercoat adhesion, an outstanding overall visual impression, very good weathering stability, very high scratch resistance, and very good polishability. It is also an object of the present invention to further develop the existing two-component adhesives and sealing compounds to give new multicomponent adhesives and sealing compounds having a high solids content and low viscosity and a long pot life which give adhesive films of especially high bond strength and seals having a particularly high sealing capacity even to chemically aggressive substances.
Accordingly we have found the novel multicomponent coating materials, adhesives and sealing compounds comprising
(A) at least one (meth)acrylate copolymer having an OH number from 130 to 200, a glass transition temperature of from −35 to +60° C., a number-average molecular weight of from 1000 to 5000 daltons and a mass-molecular weight of from 2000 to 20,000 daltons, which contains, based on the (meth)acrylate copolymer (A), up to 90% by weight of hydroxyl-containing, olefinically unsaturated monomers (a) in copolymerized form, of which
(a1) from 20 to 90% by weight, based on the (meth) acrylate copolymer (A), are hydroxybutyl (meth)acrylate and/or 2-alkylpropane-1,3-diol mono(meth)acrylate, and
(a2) 0 to 40% by weight based on the (meth)acrylate copolymer (A), are other hydroxyl-containing, olefinically unsaturated monomers;
and
(B) at least one adduct preparable from
(b1) at least one diisocyanate and
(b2) at least one compound of the general formula I having an isocyanate-reactive functional group:
in which the variables have the following definitions:
R
1
and R
2
independently of one another are hydrogen atoms or alkyl radicals having 1 to 10 carbon atoms;
X and Y independently of one another are oxygen atom, sulfur atom or a radical >N—R
6
, in which R
6
is an aliphatic radical having 1 to 30 carbon atoms, whose carbon chain may be interrupted by one or more oxygen atoms, or is an aromatic group having 6 to 30 carbon atoms;
R
3
is an alkylene radical having 1 to 5 carbon atoms; and
R
4
and R
5
independently of one another are hydrogen atoms, isocyanate-reactive functional groups or radicals R
6
;
with the proviso that one radical R
4
, R
5
or R
6
contains an isocyanate-reactive functional group or one radical R
4
or R
5
is an isocyanate-reactive functional group, in which case the other radicals R
4
1
Baumgart Hubert
Hagemeister Edeltraud
Jurczik Simone
Rink Heinz-Peter
BASF Coatings AG
Short Patricia A.
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