Urethane resins

The Showa Denka Company practices this reaction with a PX—MX mixture (24), whereas Mitsubishi Gas Chemical Company uses high purity MX first to form the dicyanide (25). In both processes, hydrogenation to the diamine follows. y -Xylenediamine is reacted with phosgene to give / -xylene diisocyanate, which is used in urethane resins (26—28). 

Nitrocellulose based lacquers often contain short or medium oil alkyds to improve flexibiUty and adhesion. The most commonly used are short oil non drying alkyds. Amino resins or urethane resins with residual isocyanate functional groups may be added to cross-link the coating film for improved solvent and chemical resistance. The principal appHcations are furniture coatings, top lacquer for printed paper, and automotive refinishing primers. 

Such polyurethanes have excellent hydrolytic stability compared to water-reducible polyesters and superior abrasion resistance. In view of the importance of developing low solvent emission coatings, considerable effort is being devoted to new types of water-borne urethane resins (62,63). 

Several coats of resin are applied to the prepared substrate at approximately 4- to 6-hour intervals, with one or more coats being dressed with colored paint flakes which are sealed in by the next coat and then lightly sanded. This type of flooring was widely marketed about ten years ago but, in the main, they were considered unsatisfactory due to rapid discoloration of the floor because of the lack of ultraviolet stability of the urethane resins used, which rapidly turned yellow-brown and looked dirty. However, ultraviolet-stable urethane resins that do not suffer this discoloration are now available, and this type of durable decorative flooring is gaining re-acceptance (for example, for kitchens, toilets and reception areas). 

Uses. In specialty reactions as a source of Cr manufacture of catalysts polymerization of olefins curing agent for urethane resins... 

The aliphatic hydroxy groups have been used as the polyol component of urethane resins (6). In many of these applications phenolic hydroxy groups have been alkoxylated to afford more aliphatic alcohols. 

In an earlier investigation by the authors (2) poly(carbonate-co-urethane) resins consisting of 1,6-hexanediol, dimethyl carbonate, and 4,4 -diphenylmethanedi-isocyanate were prepared and used as flexible thermoplastic polyurethane resins. 

POROMER1C. A term coined to describe the microporosity, air permeability, and water and abrasion resistance of natural and synthetic leather. The pores decrease in diameter from the inner surface to the outer and thus permit air and water vapor lo leave lire material while excluding water from the outside. Polyester-reinforced urethane resins have been used as leather substitutes with some success, primarily for shoe uppers. 

Figure 14 Changes in the glossiness and color difference of etherified Sugi surfaces during UV irradiation. O, Cyanoethylated wood A, allylated wood , benzylated wood , untreated wood A, acrylic urethane resin-coated wood , acrylic silicon resin-coated wood. Note UV lamps were high-pressure mercury lamps with 80 W/ cm. Coatings were transparent. (From Ref. 30.)...

Urethane resin-coated — None 70-80 — Good Medium 1.80 ... 

Fig. 11.2 Infrared spectra of three styrene acrylic urethane paints (/, II, III). S styrene, A acrylic resin, U urethane resin, T titanium white...

Polyether Diols From Urethane Resin Scrap. Organic and Polymer Waste Reclaiming Encyclopedia, p. 341. 

Use Dyes, sensitive reagent for gold (1 10 million detectable) and for free chlorine in water, curing agent for urethane resins (also available as the dihydrochloride). 

Our results and conclusions need much further study to resolve. Experiments on simpler systems need be made to isolate the various phenomena or determine their origin. In particular, time-resolved thermal analyses need to be performed on monoacrylate urethane resins and on polyacrylate, nonhydrogen bonded resins to more fully understand the mechanistic variety observed. 

Blocked or partially blocked isocyanates have been extensively employed in cationic electrodeposition. Polymeric compositions employed for cationic electrodepositable coatings have been reviewed by Kordomenos and Nordstrom (82A). Matsunaga et al. (83) were the first to synthesize cationic thermosettable urethane resins. The system described was prepared from an isocyanato-terminated polyurethane prepolymer by reacting the free isocyanato groups with a tertiary amine that had at least three hydroxyl groups. The... 

Compatibility of nitrocellulose with a wide variety of commercial urethane resins v as readily established. Laboratory work was needed, however, to develop useful formulations with excellent properties. The aliphatic-type isocyanate resins now available produce industrial coatings with good initial color and good color stability when combined with nitrocellulose. 

U.S. Pat. No. 6,702,969 [27] discloses a composite material prepared by mixing a thermoset resin, such as phenolic resin, urea resin, melamine resin, epoxy resin, urethane resin, and mixture thereof, to bind wood pieces and a filler, such as natural and synthetic graphites, metal, carbon, and other similar compounds and then-mixtures. 

Conap . [Conap] Polyester, acrylic, silicone, urethane resin systems confcx--mal coatings, casting resins. 

Dantocol . [Lonza] Dimethyl hydantoin glycols intermediates for epoxies, urethane resins, and antistatic lubricants for the textile and plastic industries. 

Hercules PE. [Hercules] Pentaeryth-ritols used in prod, of all d resins, rosin esters, oil-modified urethane resins, drying oils, synthetic lubricants, plasticizers, intumescent paints, plastics, stabQizas for plastics, explosives. 

Sanres. [Sanncor hidustries) Solvreit-based urethane resins. 

VIC . [Ashland] Pcdyester and acrylic urethane resins fw gas curing finishes for plastics, metal, heat-sensitive substrates. 

Bis(2-hydroxyethyl)-5,5-dimethyl-2,4-imidazolidinedione Dantocol DHE DEDM Hydantoin Di-(2-hydroxyethyl)-5,5-dimethyl hydantoin 1,3-Di-(hydroxyethyl)-5,5-dimethylhydantoin Diethylol dimethyl hydantoin EINECS 248 52-5 2,4-lmidazolidinedione, 1,3-bis(2-hydroxyethyl)-5,5-dimethyl-. Resin crasslinker in coatings and polymers intermediate for epoxies, urethane resins, and antistatic lubricants for the textile and plastics industries. Crystals mp = 63° pH 6.5 (5%). Lonzagroup. 

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