Desmolac

Covestro Desmolac® 4340 X/iB IPDI-based non-reactive linear polyurethane

characteristic

Non-reactive linear polyurethane based on IPDI

Binder for physically drying primers and topcoats on plastic substrates

form of supply

About 40% in xylene/isobutanol (51:9)

Specification

characteristic	Numerical value	unit	testing method
Color value (Hazen）	≤ 150	Q/3201 BYC 40	DIN EN 1557
Viscosity, 23°C	7500 ± 1500	mPa.s	DIN EN ISO 3219/A.3
Non-volatile content (1 g/1 h/125 °C)	40 ± 1	%	DIN EN ISO 3251

other data

characteristic	Numerical value	unit	testing method
Density, 20°C	about 0.94	mPa.s	DIN EN ISO 2811-1
Flash point	about 22	°C	DIN EN ISO 1523

*This data is general information and is not part of the product specification.

Features/Applications

Desmolac® 4340 X/iB is primarily used as a physically drying binder for formulating topcoats for flexible substrates such as polyurethanes and primers for solvent-sensitive plastics such as polycarbonates. Pigment dispersions such as Bayderm® Colours B-TO and C-TO (Bayer) are recommended for colour formulations. Standard pigments or pigment/filler combinations can also be used. The solvent resistance of coatings based on Desmolac® 4340 X/iB can be greatly improved by the addition of Desmodur® N 75 (10 to 20 % on solid resin basis). This can lead to post-crosslinking of the film with moisture in the air after 1 to 2 weeks. However, Desmodur® N 75 should only be added prior to coating application to prevent it from reacting with isobutanol in the mixed solvent as supplied.

compatibility

In general, Desmolac® 4340 X/iB can be mixed with the following products: Aliphatic polyisocyanates such as Desmodur® N 100, N 75, ultra N 3300 and N 3390; Aromatic polyisocyanates such as Desmodur® L/ultra L, HL and IL/ultra IL; low viscosity nitrocellulose and vinyl copolymers. However, formulations must always be tested for compatibility. Desmolac® 4340 X/iB is incompatible with polyvinyl butyral, cellulose acetate butyrate or cellulose propionate.

Solubility/Dilution

Desmolac® 4340 X/iB can be thinned to about 10% solids with aromatics, esters and ketones. It can be diluted almost infinitely with mixtures of aromatic hydrocarbons and low boiling alcohols (1:1). In general, the product has good compatibility with the above solvents, but the storage stability of the formulated solutions needs to be tested.

store

- Store in original Covestro airtight containers.

- Recommended storage temperature: 40°C max

- Avoid moisture, heat and foreign substances.

storage time

Covestro declares that the product complies with the above "specification or characteristic values" for a period of 6 months from the date of shipment as stated on the shipping document, provided that the product has been stored in full compliance with the requirements in the "Storage" clause above and handled properly Specifications or characteristic values stated in the terms (as applicable). The fact that a product exceeds the 6-month period above does not mean that it no longer meets the specifications or values set forth in the characteristic values. However, Covestro recommends that products older than 6 months from the date of shipment be tested prior to use to confirm that they still meet the values set in the specifications or characteristic values. Covestro makes no commitments for products older than 6 months from the date of shipment, nor does Covestro accept any responsibility or liability for non-conformance with the specifications or values set forth in the characteristic values.

Safety

This product data sheet applies only to the latest version of the corresponding safety document. Any updates to safety-related information consistent with legal requirements will only be reflected in the Safety Data Sheet, which will be updated and published. Information related to current classification and labelling, application and process methods, and more safety-related data can be found in the latest available safety data sheets.