Desmodur® Z 4470 MPA/X

Desmodur^® Z 4470 MPA/X is used primarily as the hardener component for lightfast two-component polyurethane coatings with high resistance to chemicals and weathering, very good gloss retention and outstanding mechanical properties. On account of its high hardness, Desmodur^® Z 4470 MPA/X is normally mixed with Desmodur^® N products. Preferred co-reactants are flexibilised polyacrylate polyols such as Desmophen^® A 565 and A 575 and polyester polyols such as Desmophen^® 670.The main applications for two-component coatings based on Desmodur^® Z 4470 MPA/X are in automotive OEM and automotive refinishing.As Desmodur^® Z 4470 MPA/X has very good physical drying properties, it is also used as an additive resin in alkyd spray coatings to accelerate drying. The main applications of such coatings are in automotive refinishing and industrial finishing.

approx. 70 % in 1-methoxypropylacetate-2/xylene, 1 : 1

Desmodur^® Z 4470 MPA/X is soluble or thinnable in polar solvents such as esters, ketones and ether esters, e.g. butyl acetate, methyl ethyl ketone and methoxypropylacetate, as well as in aromatics. Generally speaking, it has good compatibility with the solvents listed. However, the solutions formed must be tested for their storage stability. Only PU grade solvents should be used (max. 0.05 % water, absence of reactive groups such as hydroxyl or amino groups).Stable solutions with a minimum solids content of 20 % can be produced by thinning the supply form with, e.g. xylene, toluene or higher boiling aromatics such as solvent naphtha 100 or mixtures of aromatics. If prolonged storage stability of the thinned solutions is required, aliphatics should not be added. However, Desmodur^® Z 4470 MPA/X has the necessary compatibility with aliphatics to allow its addition to coatings formulated with aliphatic solvents.

Generally speaking, Desmodur^® Z 4470 MPA/X can be mixed with the following products: aliphatic polyisocyanates such as Desmodur^® N 100, N 75, N 3200, ultra N 3300, N 3400 and ultra N 3600; aromatic polyisocyanates such as Desmodur^® L/ultra L, HL and IL/ultra IL; polyester polyols such as Desmophen^® 670; polyacrylates such as the Desmophen^® A products; alkyd resins such as Alkydal^® F 48.However, the compatibility of the combinations used should always be tested.

- Storage in original sealed Covestro container. - Recommended storage temperature: 0 - 30 °C. - Protect from moisture, heat and foreign material. General information: The product is sensitive to moisture. Storage at higher temperatures will result in increase of color and viscosity. Storage at significant lower temperatures will result in solidification. This solidification is reversible by briefly heating the product without adversely affecting the quality of the product.

Covestro represents that, for a period of nine months following the day of shipment as stated in the respective transport documents, the product will meet the specifications or values set forth in section "specifications or characteristic data" above, what ever is applicable, provided that the product is stored in full compliance with the storage conditions set forth in and referenced under section "storage" above and is otherwise handled appropriately.The lapse of the nine months period does not necessarily mean that the product no longer meets specifications or the set values. However, prior to using said product, Covestro recommends to test such a product if it still meets the specifications or the set values. Covestro does not make any representation regarding the product after the lapse of the nine months period and Covestro shall not be responsible or liable in any way for the product failing to meet specifications or the set values after the lapse of the nine months period.