ISSN 1070-4280, Russian Journal of Applied Chemistry, 2007, Vol. 80, No. 7, pp. 1256–1269. © Pleiades Publishing, Inc., 2007.
Applications of Unsaturated Polyester Resins
Muhammad Ihsan Ul Haq
Paints Business I C I Pakistan Limited, 346-Ferozepur Road Lahore 54600, Pakistan
e-mail: - firstname.lastname@example.org
Received June 19, 2007
Abstract—Unsaturated polyester resins containing long chain fatty acids and styrene as cross-linking agents are
easily available in Pakistan. I have made use of these resins in the preparation of overprint varnish, ornaments,
synthetic marble and other related substances. The octates of manganese, cobalt, calcium and lead along with per-
oxide were used for jelling and drying of the resins. The effects of metal driers, aluminium stearate , peroxides
and unsaturated long chain fatty acids in the composition as mentioned in the experimental section were also stud-
ied. The merits and demerits developed in the end products resulting from the variation of these chemicals in the
compositions were also noted at their respective places.
Polyester. Polyester is a class of polymer contain-
ing reoccurring −C(=O)−O− group in the main chain
and generally are prepared from dihydric alcohols and
The polyesters are classified in to the following
(1). Linear unsaturated polyesters.
(2). Linear saturated polyesters of low molecular
(3). Linear saturated polyesters of high molecular
(4). Network polyesters.
1. Linear Unsaturated Polyesters
Linear unsaturated polyesters are generally pre-
pared from a saturated acid such as phthalic,
isophthalic, adipic or azelic and an unsaturated acid i.e.
maleic anhydride or fumarolic anhydride, which are
condensed with dihydric alcohols. A three dimensional
structure is formed by cross linking polyester back
ground with a vinyl monomer, most commonly styrene
2. Linear saturated polyesters of low molecular weight
The polyesters, which are formed in a linear satura-
tion chain having molecular weight less than 10,000,
belong to this type.
The article was submitted by the author in English.
These are mainly used as plasticides. They are ob-
tained by condensation of diol-dicarboxylic acids. Of-
ten a mono-hydric alcohol or a mono carboxylic car-
boxylic acid is used as to control the molecular weight.
3. Linear saturated polyester of high molecular weight
Poly (ethylene terephthalate) is of significant im-
portance in this category. Poly (ethylene terephthalate)
fiber is being used extensively as Mylar, Terylene, Da-
cron, and Terepak.
4. Net work Polyesters
The network polyesters are mainly used in surface
coatings. The most important polyesters of this type
are derived from phthalic anhydride and glycerin.
It was the beginning of the Second World War, which
accelerated research work in the field of fundamental
and applied chemistry. It was about the same period
when important work was carried out on understanding
chemistry of polyesters and their technical uses, al-
though they know polyester a kind since seventeenth
Berzelius in 1847 pioneered work on synthesis of poly-
ester from tartaric acid and glycerol. Lorenzo was suc-
cessful in 1863 to manufacture polyester by heating