- Basic information
Two-component Polyurethane Resins
These room temperature setting resins comprise a polyol base and a polyisocyanate curing agent which are mixed at the time of use. The polyols used include acrylic polyol with an intramolecular hydroxyl group, polyester polyol and polyether polyol.
Depending on the raw material isocyanate, there are various types of polyisocyanate prepolymers, including the TDI, MDI, XDI, IPDI and HDI types. Among them, the range of applications open to aromatic isocyanates such as TDI and MDI is generally limited because they turn yellow easily when exposed to UV light, but XDI, IPDI and HDI yellow with difficulty. They are used in a wide variety of applications including coatings and adhesives because physical properties such as curing characteristics, adhesion and plasticity can be altered freely through combinations of various polyols.
These TDI adduct types are widely used in combination with various polyols in woodworking, construction and ink binders.
These TDI polymers dry faster than the general-purpose type. Various grades are available according to the required drying speed. We also provide types with other characteristics, including types that offer greater flexibility, higher compatibility with acryl and other bases, and improved weather resistance.
Non-yellowing polyisocyanates are available for applications where weather resistance is particularly important, such as automobiles and construction exteriors. Customers can select from non-yellowing XDI, IPDI, HDI and other types depending on the required curing characteristics and physical properties. For cases where environmental friendliness is particularly necessary, we provide types that dissolve in poor solvents, and low-viscosity curing agents for used with high solids.
As polyisocyanate compounds that have been given a nonionic hydrophilic group, the Takenate WD series of soap-free water dispersible polyisocyanates disperse readily in water. They allow crosslinked structures to be formed at room temperature through reactions with active hydrogen groups in the water. In combination with the Takelac series and other acrylic resins, they form crosslinked structures to enhance resistance to water and chemicals as well as adhesion to the base material.
Polyester polyol, acrylic polyols and other polyols are compounds with several intramolecular hydroxyl groups. The hydroxyl groups react with the isocyanate groups to create a urethane bond. In addition, the special grades we offer include resins with good adhesion to polyolefins, and resins that contain strongly hydrophilic sulfobetaine groups and allow dispersion of ultrafine metallic particles, which generally disperse with difficulty.
1-component Polyurethane Resins
There are various types of 1-component polyurethane resins, including moisture curing types which harden when they react with the moisture in the atmosphere, block types which harden when heated, and lacquer types which form a film when the solvent or water evaporates.
Moisture Curing type
These resins are urethane prepolymers with residual terminal NCO groups that are cured by reacting with water in the atmosphere. We exploit differences in hardening and drying characteristics to make various types of resin available. For “greener” applications, we also offer non-toluene, non-xylene types.
Block type isocyanates are structured so that the polyisocyanates' isocyanate groups are masked by blockers to allow the creation of a 1-component type through blending with polyol ingredients that possess active hydrogen (the base). They do not react at normal temperatures and can be stored for a long time. However, when heated to the temperature at which the blockers dissociate (normally 140~200℃), the active isocyanate groups are regenerated, reacting with the polyol ingredients to form a strong film. Yellowing and non-yellowing types are available according to the type of isocyanate. Water-dispersed block types are also available, allowing their use as curing agents for water-based resins.
Lacquer type products are high polymer urethane solutions that make it possible to obtain strong films by simply allowing the solvent to evaporate. The offer fast drying and excellent weather and abrasion resistance. Customers can select from different degrees of hardness.
Demand for safer water-based resins is rising against the background of social conditions that have focused increasingly on the issues of pollution and the environment in recent years. Since the attainment of various functions has allowed the flexible adaptation of water-based polyurethane resins to diversifying performance requirements, resins with specific individual structural characteristics are now extensively used in the paint and coating materials, adhesives, binders, resin modifiers, greige goods and textile processing sectors.
1-component Polyurethane Dispersion
Because the Takelac W Series of water-based polyurethane resins have been created by dispersing urethane elastomer in water, they are non-hazardous materials and pose no concerns in the area of environmental pollution and fire caused by ignition. Based on the emulsification method used, they can be classified into self-emulsifying and forced emulsifying types, then sub-classified into anionic and nonionic types according to the types of hydrophilic groups adopted. Various grades with different degrees of hardness and adhesion are available.
1-component Self-crosslinking Polyurethane Dispersion
The Takelac WS Series of self-crosslinking water-based urethane resins use water evaporation to form crosslinked structures that create films with excellent water resistance and physical properties. Various grades with different degrees of hardness are available.