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Isocyanate 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,
in particular, 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®
RE, Desmodur® RFE, Desmodur® RC and Desmodur® RN grades
are, on account of their outstanding adhesion promotion, used for
bonding a wide variety of different sole 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 the resistance of the crosslinked film to solvents,
plasticizers, oils and grease
- improve the 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
of Bayer products in the footwear industry.
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