Plastics mouldings finished with a three-layer coating and a pro

Details Plastics mouldings finished with a three-layer coating and a pro Plastics mouldings finished with a three-layer coating and a pro

1982-12-10

1984-06-26

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

4273855, 427387, 4273935, 4274071, 4274121, 428412, 4284231, 4284233, 4284244, 4284253, 4284255, 4284256, 428447, 428502, 428520, 428522, 428524, C08J 704, B32B 702, B32B 2730, B32B 2742

Patent

active

044566476

ABSTRACT:
The invention relates to plastics mouldings, more particularly transparent plastics mouldings, which are finished with a coating of three successively stoved, chemically different layers, and to a process for producing the finish. The special finish considerably improves the scratch resistance, abrasion resistance, weathering resistance and yellowing resistance of the plastics surfaces without affecting the transparency of the plastics moulding. The first layer (primer layer) is produced from a hardenable acrylic resin and an aminoplast resin, the second layer from a thermoplastic acrylic resin, a plasticizer and a masked polyisocyanate and the third layer (cover layer) from at least one partially hydrolyzed organosilane, an .alpha.,.omega.-dihydroxy polydimethyl siloxane, a silica sol and at least one masked polyisocyanate as binder in the presence of a water-soluble organic or inorganic acid. The three-layer coating contains UV-absorbers, light stabilizers and, optionally, standard auxiliaries.

REFERENCES:
patent: 3582398 (1971-06-01), Ringler
patent: 3707397 (1972-12-01), Gagnon
patent: 4224378 (1980-09-01), Schroeter
patent: 4242412 (1980-12-01), Funaki

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