Functionality acrylic polyols

Kugel AJ, Jarabek LE, Daniels JW et al. (2009) Combinatorial materials research applied to the development of new surface coatings XII novel, environmentally friendly antimicrobial coatings derived from biocide-functional acrylic polyols and isocyanates. J Coat Technol Res 6 107-121... 

Figure 7. Elastically effective cross-link density versus bake temperature for an acrylic-urethane coating as a function of polyol to isocyanate ratio.

Shell Oil Co. EB/UV radiation cure of composition comprising a monoalkenyl arene/conjugated diene block copolymer, tackifying resin, and a di-tetra functional acrylate or methacrylate selected from the group consisting of acrylic and methacrylic acid esters of polyols. Improved high-temperature properties and solvent resistance. PSA properties,... 

An analogous approach involves particles of dimeric TDI, which have been surface deactivated by an amine or water, and then dispersed in a polyol.The polyols used in the examples given were derived from hydroxy-functionalized acrylate resins. The two-phase mixtures are said to be stable for at least three months, and can be readily cured at 70-180°C. Presumably the particles melt and the two phases mix on heating, which causes the system to react. 

Diethyl malonate blocked diisocyanates cross-fink polyols at 120°C for 30 min. The reaction with alcohols does not srield urethanes, rather transesterification occurs (134), and reaction with amines srields amides, not ureas. Storage-stable coatings can be formulated by using monofimctional alcohol in the solvent (135). Clear coats for automobiles that have both excellent environmental etch and abrasion resistance have been formulated with a combination of a hydroxy-functional acrylic resin, malonic ester blocked HDI and IPDI trimers, and an ME resin (136). 

Heteroatom functionalized terpene resins are also utilized in hot melt adhesive and ink appHcations. Diels-Alder reaction of terpenic dienes or trienes with acrylates, methacrylates, or other a, P-unsaturated esters of polyhydric alcohols has been shown to yield resins with superior pressure sensitive adhesive properties relative to petroleum and unmodified polyterpene resins (107). Limonene—phenol resins, produced by the BF etherate-catalyzed condensation of 1.4—2.0 moles of limonene with 1.0 mole of phenol have been shown to impart improved tack, elongation, and tensile strength to ethylene—vinyl acetate and ethylene—methyl acrylate-based hot melt adhesive systems (108). Terpene polyol ethers have been shown to be particularly effective tackifiers in pressure sensitive adhesive appHcations (109). 

Polyols. Typical polyols used in automotive topcoats Include acrylic copolymers and polyesters which have varied number of hydroxyl groups. Acrylic copolymers ranging in number average molecular weight from 1,000 to 10,000 and containing 15-40% by weight of a hydroxy functional comonomer such as hydroxyethyl acrylate have been studied. The acrylic copolymers were prepared by conventional free radical solution polymerization. 

The preceding study has demonstrated [2.2.1]bicycloheptenyl functionalized resins can be useful and interesting ene components in photoinitiated thiolene polymerizations. The addition of thiols to the unsaturation of this bicyclic system appears to be rapid and exothermic. The relative rates of this addition compared with allylic derivatives and vinyl ethers are quite favorable. The organic resins can be readily prepared from either polyols, f>olyamines, or acrylic precursors (Figure 10) and the yields are generally quite good. When acrylate esters are used as precursors, the cycloaddition reaction occurs spontaneously and no catalysis of the reaction is necessary. 

The typical structure of urethane acrylate oligomers is shown in Figure 11.3. The chemistry of urethane acrylate is very versatile. Essentially, the chemistry and the final properties of urethane acrylate coatings are governed by the chemical structures of isocyanate and polyol and functionality. 

Prepolymers. A broad range of acrylated resins (oligomers) are commercially available. The film-forming properties depend on the oligomer system. One of the most common is the acrylated epoxy system. In acrylated urethanes, an isocyanate-functional prepolymer with a polyol backbone can be reacted with a hydroxy-functional monomer (e.g., hydroxyethyl or hydroxypropyl acrylate). Many different resins can be synthesized by varying the polyol backbone, the isocyanate type, and the hydroxy-functional monomer. Polyester acrylates are another example of commercially important prepolymers. Acrylated acrylics have an acrylic backbone with pendant acrylate functionality. 

Polyols used for this purpose include trimethylol propane and propylene glycol. Systems containing urethane-acrylate oligomers bearing doubly-functionalized isocyanate groups are commercially available [24]. The chemical structure... 

Uses Acrylic resin for powd. coatings polyol for PU coatings Features Hyd. functional exc. exterior durability/hardness and fair mechanical props. very fast dry with long pot life and exc. UV and chem. resist. 

The performance of most cured anaerobics is primarily due to the monomers employed. Accordingly, monomers have played an important role in anaerobic research efforts. Early monomer studies led to the use of dimethacrylates of polyalkoxy polyols." In later work many other monomers have proven useful in the preparation of anaerobics exhibiting a wide variety of properties (Table II). Methacrylate remains the most common unsaturated functionality due to ease of synthesis, performance, speed of cure, and lower oxygen sensitivity (than acrylates). 

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