Unsaturated polyester resin
Unsaturated polyesters derive from the 1933 patent of Carleton Ellis.
Commercial development of polyesters for moulding began in the USA in 1941 with the introduction of a heat curing alkyl casting resin. This was followed by a low pressure laminating resin (CR-39) based on allyl diglycol carbonate and used for glass fabric reinforced radomes for aircraft.
In 1946 polyester resins containing styrene were used with a catalysed peroxide, enabling cure at room temperature – the so-called ‘cold cure’ system. Such plastics were also transparent to radar and found immediate use for wartime applications. GRP (glass reinforced polyester) laminates later found extensive use in the manufacture of boat hulls, road transport vehicle bodies and building applications.
Polyester Resin admin 2016-12-06T05:35:21+00:00