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Glycerol phthalate was the first synthetic polyester. It came into use around World War I. It was used for waterproofing. This polyester does not form linear chains, but is built as a three-dimensional structure.
- Teegarden, David M. (2004) It was also sold by a German company as a varnish resin to replace Congo Copal, on account of its excellent colour. It became subsequently the starting point for one stop Alkyd manufacture. It became the back bone of the early Glyptal alkyd resins. The name alkyd is derived from the same root, acid /alcohol. The early alkyds were called Glyptal resins, since then, these have branched out to use out to use other dibasic acids and polyhydric alcohols. Polymer chemistry: introduction to an indispensable science. NSTA Press. p. 232. ISBN 0-87355-221-0, ISBN 978-0-87355-221-9.