Stabilized photosensitive screen printing dispersion composition with diazo condensate, polyvinyl alcohol, and copolymer of vinyl acetate and N-methyloc acrylamide
US4960671A · kind A · utility
Inventor
Key dates
| Filing date | Nov 22, 1989 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Nov 22, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention relates to a screen printing stencil composition which comprises (a) a stabilized aqueous dispersion of a water insoluble addition copolymer having units of formulas: A and B where A is preferably a polyvinyl acetate group and B is preferably a polyvinyl n-methylol acrylamide group and B comprises about 3% by weight of the copolymer; (b) a water soluble colloid; and (c) a photosensitizer: The composition is useful in the formation of a screen printing stencil, the composition having both a long stable profile and forming a durable stencil; the composition on exposure through a photographic positive can be developed with water and cross-linked with acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.