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Polyisocyanate crosslinking agents for solventborne adhesives
Bayer offers solvent-based polyisocyanates under the name Desmodur®
R as crosslinking agents for solventborne adhesives.
Properties: All Desmodur® R grades are highly
reactive to water and hydroxyl compounds. When used with adhesives
based on Desmocoll® and Baypren®, they improve the heat stability,
hydrolysis resistance and the resistance to grease, oils and solvents.
They also enhance the adhesion to many materials, particularly rubber
in a variety of different compositions. The Desmodur® RC and particularly
the RN grades, used in combination with suitable adhesives, show only
a slight tendency to discoloration even on exposure to light.
Uses: Desmodur® R is used where particularly
high demands are made on the durability and strength of the bonds.
The Desmodur® RFE, Desmodur® RC and Desmodur® RN grades
are, due to their outstanding adhesion promotion, used for bonding
a wide variety of different materials such as PVC, rubber, EVA and
leather. For bonding light-colored materials, it is advisable to use
Desmodur® RFE, Desmodur® RC and particularly Desmodur®
RN. Desmodur® RFE is especially recommended where the bonds are
exposed to considerable forces and stresses or heat immediately after
application.
Advantages: The Desmodur® R grades
- significantly raise the softening point of the adhesive film
- improve resistance of the crosslinked film to solvents, plasticizers,
oils and grease
- improve resistance to chemical degradation and hydrolysis
- in particular, the RE and RFE grades improve adhesion to many
materials
Contact us and our technical
experts will be pleased to give detailed advice on specific applications
and on the formulation of adhesives based on Desmodur® R.
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