What is Resins?



Synthetic resins are industrially produced resins, typically viscous substances that convert into rigid polymers by the process of curing. In order to undergo curing, resins typically contain reactive end groups, such as acrylates or epoxides . Some synthetic resins have properties similar to natural plant resins, but many do not.

Synthetic resins are of several classes. Some are manufactured by esterification of organic compounds. Some are thermosetting plastics in which the term "resin" is loosely applied to the reactant or product, or both. "Resin" may be applied to one of two monomers in a copolymer, the other being called a "hardener", as in epoxy resins. For thermosetting plastics that require only one monomer, the monomer compound is the "resin". For example, liquid methyl methacrylate is often called the "resin" or "casting resin" while in the liquid state, before it polymerizes and "sets". After setting, the resulting PMMA is often renamed acrylic glass, or "acrylic".

Hydrocarbon resins are amorphous thermoplastic polymers produced by polymerization of unsaturated hydrocarbons. The feedstock are various by-products of naphtha crackers.1 These resins have typically a low molecular weight ranging from about 400 to 5000 g/mol. The three main types are C5 aliphatic, C9 aromatic, and DCPD cycloaliphatic resins. They are sometimes hydrogenated to reduce discoloration and to improve their heat and UV stability.

C5 Resins

C5 Resins are made from C5 piperylene and its derivatives. The most important ones are cis/trans 1,3-pentadienes, 2-methyl-2-butene, cyclopentene, cyclopentadiene, and dicyclopentadiene (see below). These monomers are polymerized to oligomeric resins with low to high softening point using Lewis acid catalysts. C5 resins are aliphatic in nature and are, therefore, fully compatible with natural rubber, most olefins (LDPE) and many synthetic elastomers of low polarity. They are available in a wide range of molecular weights (MW) and softening points (solid grades 85 - 115°C and liquid grades 5 - 10°C) and provide outstanding tack. They also have a light yellow to light brown color and possess excellent heat stability.

C9 Resins

C9 Resins are made from C9 aromatic hydrocarbons. Their composition depends on the hydrocarbon feedstock (coal tar, crude oil). The most important base monomers are indene, methyindenes, dicyclopentadiene, styrene, alpha-methylstyrene and various vinyl toluenes (see below). These resins are available in a wide range of softening points. Compared to C5 resins, they have a much higher melt viscosity, are of darker color (dark yellow to brown)2 and have higher softening point ranging from about 100 to 150°C.3 C9 resins are very versatile resins that are compatible with many polymers.


Printing inks (offset, gravure)
Pressure sensitive adhesive tape
Rubber agents
Car tires

We deal into


Phenol formaldehyde resins (PF) or phenolic resins are synthetic polymers obtained by the reaction of phenol or substituted phenol with formaldehyde. Used as the basis for Bakelite, PFs were the first commercial synthetic resins (plastics).


They have been widely used for the production of molded products including billiard balls, laboratory countertops, and as coatings and adhesives. They were at one time the primary material used for the production of circuit boards but have been largely replaced with epoxy resins and fiberglass cloth, as with fire-resistant FR-4 circuit board materials.