COATING MATERIAL FOR BLACKBOARD
PURPOSE:A coating material for a blackboard, prepared by dispersing glass powder having a specific particle diameter in a film-forming main elementary resin and an extender pigment, capable of easily removing chalk powder, etc. attached to the surface of the blackboard without remaining a mark, e.g....
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | PURPOSE:A coating material for a blackboard, prepared by dispersing glass powder having a specific particle diameter in a film-forming main elementary resin and an extender pigment, capable of easily removing chalk powder, etc. attached to the surface of the blackboard without remaining a mark, e.g. a letter, by dustless chalk, and having improved abrasion resistance. CONSTITUTION:(A) An extender pigment is mixed with (A) a film-forming main elementary resin to give a particle diameter of preferably 30-60mu. 15-100pts. wt., based on 100pts.wt. total amount of the solid content in the components (A) and component (B), one or more glass powders consisting of glass beads having a particle diameter |
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