Polyisocyanate resins

Uradnr. PSM Resins UK Ltd.] Moisture-cure polyurethane resins, polyisocyanate resins for one and two-cotrqx)-nent systems. 

OH branched, low molecular mass, hydroxy-functional 1000- 5000 melamine resins, free/blocked polyisocyanate resins automotive/ industrial paints, polyurethane/ powder coatings... 

Polyurethane systems based on hydroxypolyester resins and free polyisocyanate resins (two-pack polyurethane paints. Section 2.9) are used particularly for finishes of road vehicles, railroad vehicles, aircraft, and plastics. Blocked polyisocyanate resins are available for formulating one-pack stoving enamels which are particularly suitable for coil and can coatings [2.83]. 

Surfacers are mainly produced from low molecular mass polyester resins cross-linked with amino resins. Blocked polyisocyanate resins may also be used for high stone chip resistance. Water-soluble polyester resins are increasingly used for water-thinnable stoving surfacers. Spray and dip paints based on polyester resins are used to coat automobile accessories (e.g., windscreen wipers, axle parts). 

Polyester resins combined with aliphatic polyisocyanate resins have outstanding weather resistance, good substrate adhesion, and high flexibility even under very large temperature changes (aircraft finishes). 

Hydroxy-functional resins for combination with blocked polyisocyanate resins (based on isophorone diisocyanate) [2.96]... 

Synonyms Biuret of HDI Biuret of HMDI HDI-BT Imidodicarbonic diamide, N,N, 2-tris (6-isocyanatohexyl)- Isocyanic acid, triester with 1,3,5-tris (6-hydroxyhexyl) biuret Polyisocyanate polymer (HDI) Polyisocyanate resin (HDI) Polymeric biuret of HDI Polymeric HDI Polymeric HMDI... 

Polyisocyanate polymer (HDI) Polyisocyanate resin (HDI). See Hexamethylene diisocyanate biuret... 

As a one coat finish for plastics, acrylic urethanes have one major limitation, the aggressive solvent content of the acrylic and the polyisocyanate resins themselves. This limits their use to coatings for thermosetting substrates and a small number of TPA substrates such as ABS, PA (polyamide), RIM polyurethane and PPO (jmlyphenylene oxide). Even then, the system should be evaluated to ensure that no degradation of the plastic s impact resistance has taken place. Consult the TPA chapter for discussion on plastic substrates. 

Terpene phenolic resins can also be added to solvent-borne CR adhesives to increase open tack time and to provide a softer glue line than /-butyl phenolic resins. To provide adequate hot bond strength, these resins are used in combination with a polyisocyanate curing agent. 

E.I. Du Pont de Nemours, Colloidal stable solvent cement compositions comprising chloro-prene polymers, phenolic resins and polyisocyanate, U.S. Patent 3,318,834, 9 May, 1967. 

These requirements are usually met with two-pack paints based on hydroxyl-rich polyester or acrylic resins in the pigmented pack and aliphatic polyisocyanates in the activator pack. Cure with this type of finish is relatively fast and complete even at low ambient temperatures. An alternative finish is an acrylic lacquer, similar to the lacquer used for refinishing motor cars. These finishes are applied to the assembled aircraft by operators protected by air-fed hoods and using airless or conventional spray guns. High durability pigments are included. 

Title Polymer Compositions of Carbonyl-Hydrated Ketone-Aldehyde Resins and Polyisocyanates in Reactive Solvents... 

Research Focus Preparation of polyurethane coatings consisting of carbonyl-hydrogenaled ketone and aldehyde resins and polyisocyanates. 

Water-dispersible polyisocyanate compositions containing polyethylene oxide were previously prepared by the authors (2) and used as aqueous resin adhesives. 

The miscibility of FBZ resins with the main classes of conventional polyisocyanate cross-linkers was also tested, and it was found that they can be blended and formulated with some blocked NCO hardeners as the kcloxirnc-blocked isocyanurates, in order to obtain monocomponent or one pack (IK) high-solid polyurethane coatings " as shown in Scheme 2. Such formulations are... 

The most frequently used method to prepare fluorourethanes commercially is the well-known addition reaction of polyisocyanates with polyols. Fluorine is most frequently introduced through the polyol component, since fluorinated polyisocyanates are relatively difficult to obtain and considerably more expensive than the nonfluorinated kind.34 Examples of fluorinated alcohols for polyurethane resins are listed in Table 8.3.35... 

The afterglow of open-cell foams (punking) can be suppressed by the addition of flame-retardants such as boron trioxide or aluminum hydroxide. Hybrid foams with good mechanical properties and low combustibility can be produced from PF resins and polyisocyanates.104... 

Epoxy Resins. The use of lignin in organic polyisocyanate-liquid aromatic epoxide binders has also been evaluated (73), According to the authors, the lignin served only as a diluent, although fairly high levels of substitution ( 35%) by lignin were achieved. 

DBU and its salts have been utilized in the manufacture of polyisocyanate binders (85GEP3328662), metal phthalocyanine polymers (85JAP(K)47027), and resin-sealed light-emitting apparatus (85JAP(K)70781). 

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