Reactive polyesters

Reactive polyesters were enzymatically synthesized. Lipase catalysis chemoselecfively induced the ring-opening polymerization of a lactone having exo-methylene group to produce a polyester having the reactive exo-methylene group in the main chain (Scheme 16). This is in contrast to the anionic... 

Chemistry and Technology of Alkyd and Saturated Reactive Polyester Resins... 

Classification and Properties of Alkyd Resins Formulation and Design of Alkyd Resins Uses of Alkyd Resins Saturated Reactive Polyesters Resin Systems for Reduced Solvent Emissions Low-Solvent and Solvent-Free Alkyd Resins... 

If the plastic is liquid as is the case of reactive polyester (UPE) or methyl methacrylate resins, the metal paste should first be diluted with a liquid like styrene in case of UPE at a ratio of 1 1. This homogeneous blend is then again diluted with a liquid (1 4= blendrliquid) before adding it to the final formulation. 

A reactive polyester resin designed to provide fast cure at 155°C in 100 mil sections and providing a super smooth Class A surface finish for SMC and TMC applications. 

A highly reactive polyester for the manufacture of low profile BMC (when employed in conjunction with shrink control additives A154 A158) and other prepregs. Can also be employed for pultrusion. 

Considerable developmental work is currently being conducted on special alkyds and reactive polyesters for coatings applied as solvent-free powders. 

Functional polyesters were synthesized through the specific catalysis of lipase, and their properties and functions were evaluated. Enantio- and regioselec-tive polycondensations produced chiral and sugar-containing polyesters, respectively [20,23]. Using lipase catalyst reactive polyesters were conveniently obtained, some of which were crosslinked to biodegradable coatings. Recently, polyester-based biomaterials have been developed by lipase-catalyzed polymerizations. 

Long-chain unsaturated o, ct>-dicarboxylic acid methyl esters and their epoxidized derivatives were polymerized with 1,3-propanediol or 1,4-butane-diol in the presence of lipase CA catalyst to produce reactive polyesters [112]. The molecular weight of the polymer from 1,4-butanediol was higher than that from 1,3-propanediol. All the resulting polymers had a melting point ranging from 23 to 75 °C. 

P6 (Palatal P6) is a medium viscous, highly reactive polyester resin based on orthophthalic acid... 

Yamaguchi S, Tanha M, Hult A, Okuda T, Ohara H, Kobayashi S (2013) Green polymer chemistry hpase-catalyzed synthesis of bio-based reactive polyesters employing itaconic anhydride as renewable monomer. Polym J doi 10.1038/pj.2013.62... 

The automobile industry uses reactive polyester in the form of sheet molding compound (SMC) to mold exterior panels - lift gates, doors, side panels - for the General Motors mini-vans (Lumina APV, Silhouette and Transport). Exterior panels are also made for the Camaro, Firebird and Corvette. SMC uses 5 to 10 xm ground calcium carbonate at about 200 phr and oriented glass fiber to produce a composite offering stiffness, resistance to temperature and a smooth paintable surface. 

---