Copolymers comprising low surface tension (meth)acrylates
a technology of methacrylate and copolymer, which is applied in the field of new (co) polymer compositions, can solve the problems of high molecular weight, poor flow properties, and difficulty in controlling molecular weight distribution and composition, and achieve the effect of low surface tension
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example 1
Synthesis of Gradient Copolymer MMA-Gradient-2-EHMA-b-Zonyl™
[0140]The gradient copolymer MMA-gradient-EHMA-b-Zonyl™ was prepared by polymerization the ingredients in Table 1 in Aromatic 100 solvent:
TABLE 1IngredientsParts by weight (grams)Charge 1Aromatic 100300Copper0.89Tris(2-aminoethyl) amine / 6BA8.96Ethyl-2-bromoisobutyrate27.30MMA196Charge 22-EHMA777.38Aromatic 100100Charge 3Aromatic 10060.90ZONYL TM fluoromonomer74.762-(perfluoroalkyl)ethylmethacrylate (DuPont)
[0141]Charge 1 was heated in a reaction vessel with agitation at 80° C. and the reaction mixture was held at this temperature for 1.5 hours. After partial homopolymerization of MMA, charge 2 was continuously added to the reaction vessel for 3 hrs to form a compositional gradient along the polymer chain. The compositional gradient was controlled through the use of controlled 2-EHMA addition based on its reactivity ratio found in the literature (r1MMA=0.86, r2 EHMA=0.69: Journal of Thermal Analysis, Vol. 36, pp. 617-628 (19...
example 2
Resistance of Paint to Contamination
[0143]A commercial, solvent-borne, thermosetting clear coat, DCT5555 (available from PPG Industries, Inc., Pittsburgh, Pa.) was deliberately contaminated with a commercial caustic wash solution typically used in cleaning transport containers for coatings and known to induce cratering. The polymer of example 1 was added to a portion of this clearcoat at a level of 0.1% by weight and thoroughly mixed by stirring.
[0144]The clear coat treated (with the polymer of example 1) and an untreated clear coat were applied to sixteen 12″×18″ commercially available electrocoated steel panels using an ESTA bell. The clear coat was applied in two coats with a 90 second flash between coats, flashed for 10 minutes at ambient conditions, and then baked for 10 minutes at 345° F. The final film thicknesses were 1.8 to 2.0 mils. The total number of craters in the untreated, cured panels was 33. The total number of craters on the treated, cured panels was 22. Appearance...
example 3
Resistance to Surface Contamination
[0145]A commercial, solvent-borne, thermoset clearcoat (FDCT 8000, available from PPG Industries, Inc.) was treated, as described in example 2, at 0.05% and 0.1% with the polymer of example 1.
[0146]Commercially available electrocoated 4″×12″ steel panels were spot contaminated with 0.1 to 0.2 microgram quantities of a series of polymers with varying surface tension. The two treated and one untreated clear coats were spray applied onto identically spot contaminated test panels. The clearcoat was applied in two coats with a sixty second flash in between coats, flashed for 10 minutes at ambient conditions and baked for 30 minutes at 285° F. Dry film thicknesses were 1.6-1.8 mils.
[0147]The ability of each clear coat to cover each of the contaminant polymers without leaving a visible defect has been correlated to its crater resistance. Each contaminant spot was rated against a set of arbitrarily defined standards. Typical ratings for each clear coat, wi...
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