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Rapid drying lacquers containing triblock copolymer for rheology controlRelated Patent Categories: Synthetic Resins Or Natural Rubbers -- Part Of The Class 520 Series, Natural Rubber Compositions Having Nonreactive Materials (dnrm) Other Than: Carbon, Silicon Dioxide, Glass Titanium Dioxide, Water, Hydrocarbon, Halohydrocarbon, Ethylenically Unsaturated Reactant Admixed With A Preformed Reaction Product Derived From: (a) At Least One Polycarboxylic Acid, Ester, Or Anhydride; (b) At Least One Polyhydroxy Compound; And (c) At Least One Fatty Acid Glycerol Ester, Or A Fatty Acid Or Salt Derived From A Naturally Occurring Glyceride, Tall Oil, Or A Tall Oil Fatty Acid, At Least One Solid Polymer Derived From Ethylenic Reactants Only, Polymer Derived From Ethylenic Reactants Only Mixed With Ethylenic ReactantRapid drying lacquers containing triblock copolymer for rheology control description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060287437, Rapid drying lacquers containing triblock copolymer for rheology control. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] This invention relates to coating compositions and in particular to rapid drying lacquer coating compositions that are particularly useful for automotive refinishing. BACKGROUND OF THE INVENTION [0002] To refinish or repair a finish on vehicle, such as a basecoat/clearcoat finish on automobile or truck bodies, different fast-drying coating compositions have been developed. A number of pigmented and clear air-dry acrylic lacquers have been used in the past to repair basecoat/clearcoat finishes, but none meet the rapid drying times that are desired, while also meeting today's performance requirements, such as excellent stone-chip resistance, humidity resistance, intercoat adhesion, and appearance. [0003] A key concern to a refinish customer which is typically the vehicle owner is that the coating in use has excellent durability and weatherability and an attractive aesthetic appearance. [0004] Another key concern of the automobile and truck refinish industry is productivity, i.e., the ability to complete an entire refinish operation in the least amount of time. To accomplish a high level of productivity, any coatings applied need to have the ability to dry at ambient or slightly elevated temperature conditions in a relatively short period of time. The term "dry" means that the resulting finish is physically dry to the touch in a relatively short period of time to minimize dirt pick-up, and, in the case of the basecoat, to allow for the application of the subsequent clear coat. [0005] It is also desirable to have quick drying basecoats for additional reasons. If the applied basecoat composition layer has not dried sufficiently before the clearcoat composition is applied, then the application of the clearcoat will disturb the basecoat layer and the appearance of the basecoat will be adversely affected. For basecoats containing special effect pigments, e.g., flake pigments such as metallic and pearlescent flakes, the metallic flake control and metallic appearance (or downflop) of these basecoats will suffer due to disturbance of the flake pigment by intermixing of the coating layers at their interface. "Downflop" refers to a phenomenon associate with metallic effect coatings wherein the color varies with the angle of view to provide a three dimensional metallic effect on the surface of the vehicle. [0006] Cost and volatile organic solvent content are further concerns in formulating automotive refinish coating compositions. For example, cellulose acetate butyrate (CAB) resins have been used to shorten the dry to handle time and as rheology control additives to enhance metallic flake control and other properties in refinish basecoats, but coating compositions containing these CAB material require an undesirable high amount of organic solvent. In addition, these CAB materials are relatively expensive and require added steps in the coatings manufacturing process. The CAB materials are also specialty products that are not widely manufactured. [0007] It would be advantageous, therefore, to have a lacquer coating composition, especially a refinish basecoat lacquer, having a short tack-free drying time at ambient temperature conditions, good metallic flake control and appearance, that is less expensive, that has a reduced amount of regulated emissions, and has the ability to form a finish with excellent chip and humidity resistance and adhesion. The novel composition of this invention have the unique combination of properties desired. SUMMARY OF THE INVENTION [0008] This invention is directed to a coating composition, especially to a lacquer coating composition, comprising a film-forming binder and a volatile organic liquid carrier, wherein the binder contains, preferably as a replacement for all or part of the cellulose acetate butyrate component, a uniquely segmented triblock copolymer. More particularly, the tri-block copolymer is an ABA'-block copolymer, wherein the ABA' block copolymer has a weight average molecular weight of about 5,000 to 200,000 and contains a polymeric A block, a polymeric B block, and a polymeric A' block; wherein: [0009] (a) the polymeric A block is of polymerized ethylenically unsaturated monomer(s); [0010] (b) the polymeric B block is of a polymerized ethylenically unsaturated monomer(s); and [0011] (c) the polymeric A' block is of polymerized ethylenically unsaturated monomer(s); and further wherein [0012] the polymeric A block, polymeric B block, and polymeric A' block of the block copolymer, are linearly attached to each other, in the order given or in reverse order, each at a single point thereof; [0013] the A and A' blocks have the same or similar composition and the B block, which is disposed between the A and A' blocks, has a different composition from the A and A' blocks; [0014] the A and A' blocks differ from the B block by the presence, on the A and A' blocks, of one or more functional groups that are capable of interacting with each other or hydrogen (H) bonding with each other for the formation of a reversible network; and [0015] the functional groups are selected from at least one of the group consisting of carboxylic acid, hydroxyl, urea, amide, and ethylene oxide groups, or mixtures of any of the above. [0016] Preferably, the dissimilar B block disposed between the A' and A' blocks is a non-functional block, essentially free of functional groups. [0017] The lacquer composition is most suited for use as a pigmented basecoat lacquer in automotive refinish applications, on top of which a transparent (clear) topcoat is applied. [0018] While this composition is preferably used as a lacquer coating which dries via solvent evaporation absent any substantial crosslinking occurring, it optionally may contain a polyisocyanate crosslinking agent for further improved film properties. [0019] This invention is further directed to a process for producing a coating on the surface of a substrate, such as a vehicle body or part thereof, wherein the process comprises: [0020] applying a layer of a lacquer coating composition on the substrate surface, which may be previously primed or sealed or otherwise treated, the lacquer comprising the aforesaid composition; and [0021] drying the layer, preferably at ambient conditions, to form a coating on the surface of the substrate, on top of which a clearcoat can be applied. Continue reading about Rapid drying lacquers containing triblock copolymer for rheology control... 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