The question refers to the adhesion of screen printing colours on a base of polyvinylbutyral and how it can be avoided. Several possibilities are open:
- Use of a high-melting type of polyvinylbutyral (e.g. BL 16 from Wacker).
- Use of an additive for improving the surface. There are a great many of these, for example, from Georg M. Langer, D-2863, Ritterhude (including a PTFE base), as well as from Servo, Holland, and from several other countries as well.
- Polyvinylbutyral has the excellent property of being able to combine with many other binding agents. Evidence of this is given in the Wacker literature. Their address is D-8000 Munich.