Unsaturated polyester resins with different allyl ethers as crosslinking built-in monomers

Abstract

The effect of the structure of allyl ethers used as built-in monomers of unsaturated polyester resins on the properties of the coatings obtained have been studied. It was found that high hardness of the coatings cured in air using photoinitiators was achieved for the resins with polyfunctional allyl ether monomers incorporated into polyester molecules as the end groups or as the pendant geminal groups. The influence of the presence of a cobalt organic salt on the hardness of the coating from unsaturated resins has also been studied. The extent of crosslinking for the copolymerization of fumaric esters with allyl ethers in air increases, and a smaller amount of photoinitiator may be used when cobalt (II) naphthenate is present in the resin. The results are discussed in terms of the oxidation of allyl ethers and redox cleavage of peroxides formed, leading to an increase in the rate of copolymerization of allyl ethers with fumarate esters.

Technological Aspects of Highly Selective Synthesis of Allyloxyalcohols—New, Greener, Productive Methods

“…Nowadays, the open-air free radical photocuring with using acrylate, unsaturated polyester resins (UPR) and others is the dominant technology for industrial green UV-production of polymeric layers (up to 95%), mainly due to the fast and versatile chemistry and the wide commercial availability of various suitable monomers and photoinitiators [7]. Moreover, the allyl ethers also play a role in non-hazardous reactive diluents and crosslinking agents in the polyesters systems, affecting both the cure rate and the good final properties of the polyester styrene-free products [8]. The allyl ether unit could serve as starting point to various other functional groups.…”

Synthesis of two PET waste derived bisacrylic and bisallylic monomers and their potential use as crosslinking agents and dental resin composites

“…On the other hand, some allyl esters containing two double bonds such as diallyl isophthalate or diethylene glycol bis(allyl carbonate) have found use in the manufacture of heat‐resistant molding composites for electronic applications and eyeglass lenses, respectively. Besides, other polyfunctional allyl esters have been used for crosslinking or curing preformed vinyl‐type polymers, while some allyl eters are used as reactive diluents in the synthesis of unsaturated polyesters resins …”