Title: Formulation of powderless chalk
Application Number: 85106708 Application Date: 1985.09.03
Publication Number: 1009329 Publication Date: 1987.03.11
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: B43K19/00,C09D13/00
Applicant(s) Name: Wang Xizhong Address:
Inventor(s) Name:
Attorney & Agent: ZHOU SUXIA
Abstract:
     The present invention is concerned with a improved formulationof powderless chalk based on the formulation of chalk made by U.S.A. and tianjin Inorganic chemical industry inst., by which properties of powderless chalk is largely improved, comparing it with conventional chalk, it has advantages such as wearproof, durability, lower dust, no wafting dust, non-adhering to hand, maisture-resistance, fluent writing, clear handwriting sign and no damage to blackloard, the raw waterial used for producing it is available easly with simple operating and low cost.
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