|
Tin-catalyzed condensation-cure chemistry offers important advantages:
-
The catalyst is relatively inexpensive.
-
The coating is very robust, resistant both to substrate inhibition and
catalyst poisoning.
-
There is little adhesive interaction.
There are some drawbacks to this cure chemistry:
-
The necessity for post-cure often rules out two-sided and in-line
applications.
-
Blocking can occur. This is the tendency of a liner coated on both sides to
bond to itself during storage.
-
There is greater potential for silicone migration.
-
Tin and rubber are mildly interactive, which makes tin-catalyzed coatings
less desirable with SBR adhesives.
Tin-catalyzed coatings have been successfully applied to emulsion based
delivery systems.
|
Change
