Before working with this product, you must read and become familiar with the available information regarding its risks, proper use, and safe handling. This information is provided in various formats, including the current Safety Data Sheet (SDS) and product label. SDS can be accessed via the following link:
Safety Data Sheets (SDS) for Covestro products | Covestro
For further questions, please use the contact information provided on this technical data sheet.
Product description
Oil-free, hydroxyl-bearing polyester.As the polyol component in the formulation of lightfast one-component polyurethane baking coatings with blocked aliphatic polyisocyanates.
Applications
Desmophen® T 1777 SN was developed specially as a co-reactant for blocked polyisocyanates in coil coating applications. When combined with preferably Desmodur® BL 4265, it yields one-component polyurethane coil coatings with a balanced hardness/flexibility ratio and good resistance to scratching and abrasion.The product can be combined with other blocked isocyanates and HMMM-type amino resins. However, such formulations do not generally achieve the same high surface hardness as is achieved with Desmodur® BL 4265.Desmophen® T 1777 SN can be combined with e.g. Desmodur® BL 4265 or Desmodur® BL 2078/2 for the formulation of sterilization-proof basecoats and clearcoats for exterior can coating application.
Form supplied
Approx. 77 % in solvent naphtha® 100
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Hazen color value | ≤ 100 | DIN EN 1557 | ||
| Acid value | ≤ 5 | mg KOH/g | DIN EN ISO 2114 | |
| Viscosity | at 23 °C | 5,500 ± 1,500 | mPa*s | DIN EN ISO 3219/A.3 |
| Non-volatile content | (2 g resin/2 ml toluene/1 h 125 °C/convection oven) | 77,0 ± 1,5 | % | DIN EN ISO 3251 |
| Hydroxyl content | 2,0 ± 0,4 | % | DIN EN ISO 4629-2 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Equivalent weight | approx. 850 | |||
| Density | at 20 °C | approx. 1,08 | g/ml | DIN EN ISO 2811-2 |
| Flash point | approx. 48 | °C | DIN EN ISO 1523 |
Solubility / thinnability
Generally speaking, Desmophen® T 1777 SN is reducible to a solids content of approx. 35 % with esters, ketones, ether esters and aromatic hydrocarbons, including the higher boiling aromatic mixtures such as solvent naphtha® 100, 150 and 200. Aliphatic hydrocarbons and lower boiling alcohols are not suitable for thinning.The compatibility and storage stability of the thinned solutions should always be tested.
Compatibility
Desmophen® T 1777 SN is compatible with Desmophen® T 1665, Desmophen® 680 , 1200, 1300, and 881 X in a ratio of up to 2:1 (solids on solids). Compatibility with alkyd resins has to be checked.Given equivalent crosslinking, it is compatible with Desmodur® BL 1265, BL 3175, BL 2078/2, BL 3272, BL 3370, BL 3475 and BL 4265, N 75, N 3200, ultra N 3390 and Z 4470.However, the pot life is greatly reduced if non-blocked polyisocyanates are used.Compatibility of the intended combinations must be tested.
Storage
- Storage in original sealed Covestro container. - Recommended storage temperature: max. 30 °C. - Protect from moisture, heat and foreign material.
Storage time
Covestro represents that, for a period of six 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 six 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 six 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 six months period.
Health and Safety Information
Disclaimer
Responsibility and Liability
The use of Covestro products, technical assistance, and information (regardless of how provided) is outside Covestro’s control and is solely the responsibility of the customer. The customer must conduct adequate testing to determine the suitability of products for its intended use, including but not limited to technical, health, safety, and environmental aspects. Unless otherwise agreed in writing, all products are sold exclusively under Covestro’s standard conditions of sale, which prevail in case of conflict and are available upon request.
The terms and conditions of sale and delivery are available via the following link:
https://order.covestro.com/covestrostorefront/saleConditions
All information is provided “as is” without warranties, express or implied, including merchantability or fitness for a particular purpose, and is subject to change without notice. To the maximum extent permitted by law, Covestro disclaims, and the customer assumes all liability for losses, damages, or claims arising out of use of Covestro products, technical assistance, or information. Any statement or recommendation not expressly contained in Covestro documentation is unauthorized and shall not bind Covestro. Nothing herein shall be construed as encouraging or recommending the use of any product in conflict with any claim of any patent. No license is implied or in fact granted under the claims of any patent.
Restrictions on Regulated Applications
This product is not intended for use in regulated applications such as agriculture, cosmetics, drinking water contact, medical products (e.g., medical devices), toys, or similar uses subject to specific regulatory requirements. Prior written approval from Covestro is required before this product may be used in any regulated application. The customer is solely responsible for ensuring compliance with all applicable laws and determining product suitability. Covestro disclaims all liability and warranties for unauthorized regulated uses.
Conditional Use in Regulated Applications
This product may be suitable for use in food contact. However, use in such applications requires prior written approval from Covestro. Legal requirements for such applications vary by country and jurisdiction, and the customer is solely responsible for verifying compliance with all applicable laws and regulations. Without Covestro’s written approval, the product may not be distributed or used for regulated purposes, and Covestro disclaims all liability for such use.
Typical Value
The values provided are typical only and do not represent binding specifications. Unless expressly confirmed in a written contract, these values are not part of the contractual quality agreement and must not be relied upon as a warranty or guarantee of product performance.
Sample
Samples provided by Covestro are intended solely for evaluation and testing purposes by the customer and may not be used in commercial applications, resold, transferred to third parties (except qualified testing service providers acting on behalf of the customer), reverse engineered, modified, or used in any manner not explicitly authorized in writing by Covestro. Samples are provided ‘as-is’ without any warranties, express or implied, including fitness for a particular purpose. Customers are solely responsible for ensuring safe handling, regulatory compliance, and suitability of the material for their intended evaluations. Covestro disclaims all liability for damages or losses arising from the use of samples.
Contact Information
Please use our contact form or contact us directly by sending an e-mail to technical-datasheets@cx.covestro.com .
