Process for the formation of undercoat for CRT metal back layer

Details Process for the formation of undercoat for CRT metal back layer Process for the formation of undercoat for CRT metal back layer

1991-07-17

1993-05-04

Beck, Shrive

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

427 68, 427 73, 4274072, 427415, B05D 506

Patent

active

052080650

ABSTRACT:
A process is described for the formation of an undercoat which is in turn useful in forming a CRT metal back layer. According to the process, a pretreatment composition is coated on a glass panel having a fluorescent layer overlaid thereon, so that a water film is formed. The pretreatment composition is composed of 2-20 wt. % of an alkyl monoalcohol having a C.sub.1-3 alkyl group, 0.05-1 wt. % of a water-soluble, high molecular compound and 79-97.95 wt. % of water. An undercoating composition is then coated on the water film by a wet-on-wet coating method, whereby a coating layer is formed. The undercoating composition is composed of 1-7 parts by weight of an acrylic resin, which has been obtained by polymerizing 90-100 wt. % of an alkyl methacrylate having a C.sub.1-4 alkyl group other than tertbutyl methacrylate and 0-10 wt. % of an ethylenically unsaturated monomer copolymerizable therewith, and 99-93 parts by weight of a solvent containing at least 80 wt. % of toluene. The sum of the acrylic resin and the solvent is 100 parts by weight. The water film and the coating layer are dried to form the undercoat.

REFERENCES:
patent: 3839068 (1974-10-01), Miura
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patent: 4293586 (1981-10-01), Unnai et al.
patent: 4657961 (1987-04-01), Nishizawa et al.
patent: 4746588 (1988-05-01), Ditty et al.
patent: 5039551 (1991-08-01), Fujita
patent: 5073463 (1991-12-01), Fujital

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