Film material for forming blackboards

Details Film material for forming blackboards Film material for forming blackboards

1977-12-16

1979-02-06

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

35 61, 35 66, 106 325, 428215, 428323, 428325, 428328, 428330, 428331, 428500, 428516, 428425, 428447, 428520, B43L 2100, B32B 702

Patent

active

041385233

ABSTRACT:
Disclosed is a plastics film material for forming blackboards, which comprises a film of polyethylene or polypropylene covered on one surface with a layer of paint. The layer of paint is made of polyurethane resin composed of polyol and polyisocyanate and containing a coloring pigment, a bulking agent, such as powdered alumina and powdered calcium carbonate, and in some cases, silicone oil or polyethylene wax. The film material is attached to a base board with the layer of paint exposed on the outside to form a blackboard.

REFERENCES:
patent: 3027343 (1962-03-01), Kane
patent: 3497969 (1970-03-01), Schwoegler
patent: 3607536 (1971-09-01), Bragole
patent: 3642562 (1972-02-01), Kawaguchi
patent: 3655423 (1972-04-01), Lin
patent: 3894306 (1975-07-01), Sischka
patent: 3916050 (1975-10-01), Kurhajec
patent: 3997702 (1976-12-01), Schurb
patent: 4020227 (1976-04-01), Deffeyes

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