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LARIPUR - TPU for injection and extrusion process



LARIPUR is the range of thermoplastic polyurethanes and consequently combine the working technology of thermoplastic products together with the well-known features of polyurethanes:

  • Excellent abrasion resistance
  • Great flexibility and constancy at various temperatures
  • Good compression set resistance
  • Good water and light resistance
  • Good resistance to oils, fats and many types of solvents

Depending on their chemical nature, LARIPUR can be grouped into several categories whereby the products are formulated to give the typical properties of polyurethanes as above.

LARIPUR covers a wide range of hardness from 60 Shore A to 75 Shore D. An important property of the LARIPUR products is the total absence of plasticizers. There are however plasticized grades available which are suitable for specific applications.

The raw materials used in the manufacture of LARIPUR are isocyanates, chain extenders and polyols, which are reacted in carefully controlled conditions in order to ensure the highest possible quality and consistency of the end product. By varying the quantity of the components in the formulation of the polyurethane, it is possible to cover a wide range of applications giving different mechanical and chemical resistances.

The general characteristics of each series are as follows:


Series 15 and 18 are based on saturated polyester and contain a small amount of plasticizer. These products have been specially developed to fill a gap between rubber materials and polyurethanes. They combine to give a very soft product but with polyurethane’s typical features such as good flexibility and abrasion resistance, while maintaining short processing times. This can be particularly applied to the shoe industry where thermoplastic polyurethanes guarantee excellent adhesion to two-component polyurethane without applying any primer.

Series 20 is based on standard grade saturated polyester. These products show strong resilience and tear resistance, excellent abrasion resistance and good stability in water solvents, light and oxidation.

Series 25 products are based on special grade saturated polyester. This group of LARIPUR products exhibit features which are similar to those of Series 20 but are characterised by a higher resistance to hydrolysis failure and improved flexibility at low temperatures.

Series 2102 products are based on polycaprolactones. They behave roughly in the same way as TPU in the special ester series but exhibit a higher resistance to hydrolysis failure.

Series 50 products are obtained by homogenously incorporating small quantities of particular techno-polymers in some rigid types belonging to the special ester series. They couple their elevated hardness with an excellent cold impact resistance.

Series 60 products are based on a polyether polyol. Compared to the ester series, they show a better resistance to hydrolysis and microbiological attack; have very good cold flexibility but show lower resistance to oxidation.

These are specially developed TPUs for manufacturing hydraulic gaskets or any other application where at high compression set, resistance to oils and/or high temperatures, is required. Two products based on polycaprolactone (2202-95A and 107-93A) plus one based on polyether (2203-93A) belong to this group depending on the application.

IMUTHANE - hot cast and cold curing elastomers



IMUTHANE is the family of castable polyurethane prepolymers exhibiting superior abrasion resistance, high tear strength and excellent load bearing ability. Polyurethane parts are conveniently made by mixing two components – a low-molecular-weight prepolymer, which contains reactive isocyanate groups and a curative which contains hydroxyl or amine groups. The mixture is poured into a heated mould where the components react to form a solid elastomeric article.

COIM offers prepolymers under the brand name IMUTHANE and VERSATHANE, and curatives to make cast elastomers. IMUTHANE has a large range of prepolymers, manufactured from both TDI and MDI with PTMEG, PPG and polyester polyols.

Some of the most popular applications of castable polyurethanes are:

  • Steel mill, textile mill, paper mill and printing rollers
  • Suspension aids
  • Wheels and tyres
  • Squeeze and scrapers
  • Mining screens and equipment
  • Chute liners
  • Pipe cleaning pigs
  • Hydro-cyclones
  • Anti-vibration pads
  • Hydraulic seals

UREXTER – polyurethane shoe sole systems

Shoe Sole Systems


UREXTER is the trade name for the family of prepolymers (Urecom) and ester based polyols (Exter) for microcellular polyurethane systems. Their main use is in the production of footwear soles; however they are also used to produce technical articles such as tyres for trolleys, bicycles and wheelchair wheels and parts for the automotive industry such as shock absorbers, gaskets etc.

In comparison to other materials, especially those related to the production of shoe soles, the advantages are:

  • High productivity
  • Excellent resistance to abrasion
  • Excellent mechanical characteristics such as the load bearing, elongation, ultimate tensile strength and tear strength
  • Excellent cold mechanical properties, in particular the resistance at breaking under flexural stresses
  • Good resistance to hydrolysis, allowing the use in highly humid climates
  • Good resistance to bacterial attack in case of hot-humid climates or in the presence of perspiration
  • Good biodegradability of the manufactured article at the end of the period of use
  • Excellent reproduction of the mould designs

COIM has a complete range of ester based systems for footwear and can develop systems to meet a customer’s specific requirements:

  • Indoor sole systems (slippers) - characterized by their lightness and load bearing
  • Medium performance systems such as soles for women's shoes and men's summer shoes - characteristics such as density, load bearing, mechanical characteristics and flexural strength are maintained from ambient temperature up to medium low temperatures
  • High performance systems for closed winter shoes for men are characterized by excellent flexural strength even at very low temperatures and/or high resistance to hydrolysis, whilst maintaining good load bearing and acceptable density
  • Bidensity safety sole systems, having a good balance of the characteristics previously mentioned as well as good resistance to oils, solvents and hydrocarbons. Moreover the material is produced with antistatic characteristics (to avoid the accumulation of electrostatic charges)
  • Mono and bidensity sole systems for sport activities

LARICOL - TPU raw material for adhesives

Raw Material for Adhesives


LARICOL is the family of thermoplastic polyurethane granules mainly used in the preparation of adhesive solutions, after being dissolved in suitable organic solvents and for thermo-adhesive process via powder sintering and film extrusion.

LARICOL grades are used in the footwear industry (where they are employed as thermo-reactive adhesives), as well as in industrial and automotive applications.

The main advantages of these adhesives are:

  • High adhesive strength and good flexibility
  • Excellent resistance to oils, fats and plasticizers
  • High adhesion to a wide range of synthetic and natural materials such as PVC, EVA, PE and leather, after suitable
    pre-treatment of the surface, TR and SBR
  • Good thermal resistance

The range of LARICOL offers a various balance of properties such as green strength, open time, thermal resistance and a wide range of solubility in the most common organic solvents. LARICOL products are supplied with a standard viscosity of about 2000 cps at 25°C (related to 15% MEK solution) but many other viscosities are available upon request.

DIEXTER G - saturated polyester polyols

Saturated Polyester Polyols

COIM is able to develop DIEXTER G grades in order to satisfy the specific needs and formulation requirements of their customers.

In polyurethane formulation DIEXTER G saturated polyester polyols are used in order to provide and improve the elastomeric properties in the molecular structure.

The application areas covered by the use of DIEXTER G polyols are:

  • Microcellular elastomers
  • Thermoplastic polyurethanes (TPU)
  • Slabstock foams (including low fogging grade)
  • Synthetic leathers
  • Adhesives (lamination, packaging, hot-melt etc.)
  • Systems for casting
  • Paints, coating and polyurethane dispersions

In comparison to other polyol classes, DIEXTER G saturated polyesters provide:

  • Good oxidation resistance
  • Good cold-flex behaviour
  • Good thermal resistance
  • Good chemical resistance (oils and solvents)
  • Excellent mechanical properties (modulus, tensile strength, elongation)
  • Good crystallisation rate


ISOEXTER-ISOTER - polyols for rigid foams




ISOEXTER is the family of saturated polyester polyols designed for production of polyurethane rigid foams. The variety of grades allows the exploration of the well-known and superior fire resistance of polyesters versus polyethers by the development of PU and PIR systems, with the benefits of:

  • Keeping the present process technology
  • Maximizing performance / cost balance
  • Environmentally friendly

The main features of ISOEXTER polyols are:

  • Aromatic and aliphatic nature
  • Medium to high functionalities (from 2 to 4)
  • Manageable viscosities (low-medium)
  • Wide range of OH values (from 150 to 600)
  • Compatibilities with the various polyols (polyesters or polyethers) and blowers

By optimizing the formula and the ISOEXTER grades chosen, it is possible to achieve:

  • Foams meeting the various fire standards with systems containing a low level of fire retardants
  • Foams with improved lambda value
  • Foams with very good physical-mechanical properties even with systems at high water level
  • PIR systems which can be easily processed

ISOEXTER are used in polyurethane systems essentially for the following main applications:

  • Flexible faces continuous lamination
  • Rigid faces continuous lamination
  • Discontinuous sandwich panels
  • Appliances
  • Continuous and discontinuous blocks
  • One component foam (OCF)
  • Wood imitation
  • Spray

ISOTER Polyols:

ISOTER are polyether polyols from propylene oxide and various starters used in formulations of systems for polyurethane rigid foam production.

The variety of grades available allows the selection of the most appropriate type according to the blowing agents used in the system and the final foam properties desired.

The polyols have been obtained by designing molecular weights and functionalities in order to satisfy the need of the specific application in terms of process and system performance.

The relative foams show very good physical-mechanical properties mainly as far as dimensional stability and friability are concerned.

ISOTER polyols are very compatible with ISOEXTER series; therefore it is possible to formulate systems combining the best properties of the two kinds of products. In the ISOTER family there are self-reactive grades recommended as co-polyols in order to obtain the desired reaction profile and curing of the system in the different conditions of application. On customer request, COIM can study and supply tailor-made grades to satisfy specific needs.


The ISOEXTER V series is based on fully formulated polyols for PUR and PIR systems to produce rigid foams for the various applications:

  • Continuous lamination
  • Discontinuous sandwich panels
  • Appliance
  • Blocks
  • Shutters
  • Spray




Selection of a pigment for a particular application is determined by cost, and by the physical properties and attributes of the pigment itself.

Pthalate and non-pthalate grades are available according to the requirements for “Substances of Concern”. Any colour and viscosity can be matched. The pigments are very finely ground and have very excellent covering power.

The following are some of the attributes of pigments that determine their suitability for particular manufacturing processes and applications:

  • Light-fastness and sensitivity for damage from ultra violet light
  • Heat stability
  • Toxicity
  • Tinting strength
  • Dispersion
  • Opacity or transparency
  • Resistance to alkalis and acids
  • Reactions and interactions between pigments

Two different viscosity ranges are available to suit the application:

  • Viscosity 500 to 1000 cps for those feeding pigment through pump
  • Viscosity above 1500 cps for those feeding pigment directly into PU tank