LARIPUR is the range of thermoplastic polyurethanes and consequently combine the working technology of thermoplastic products together with the well-known features of polyurethanes:
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 PLASTICIZED ESTER
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 STANDARD ESTER
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 SPECIAL ESTER
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 POLYCAPROLACTONE ESTER
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 MODIFIED ESTER
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 AND 2103 ETHER
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.
PRODUCTS FOR GASKETS
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 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:
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:
COIM has a complete range of ester based systems for footwear and can develop systems to meet a customer’s specific requirements:
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:
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.
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.
In comparison to other polyol classes, DIEXTER G saturated polyesters provide:
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:
The main features of ISOEXTER polyols are:
By optimizing the formula and the ISOEXTER grades chosen, it is possible to achieve:
ISOEXTER are used in polyurethane systems essentially for the following main applications:
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.
ISOEXTER V Polyols:
The ISOEXTER V series is based on fully formulated polyols for PUR and PIR systems to produce rigid foams for the various applications:
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.
Two different viscosity ranges are available to suit the application: