| 摘要 |
An adhesive primer composition is provided to increase the adhesion between a primer layer formed on the base film of a keypad and a UV liquid molding composition, to allow stable attachment of the UV liquid molding composition due to excellent smoothness, and to realize excellent smoothness of the resultant keypad. An adhesive primer composition is obtained by the method comprising the steps of: providing main ingredients(A) containing 25-35 wt% of a polyurethane resin, 19-21 wt% of N,N-dimethylformamide, 20-24 wt% of methyl ethyl ketone, 7-9 wt% of toluene and 19-21 wt% of xylene; providing a curing agent(B) containing 99,6 wt% of a modified polyisocyanate and 0.4 wt% of hexamethylene diisocyanate(HDI) and mixing the main ingredients(A) with the curing agent(B) in a ratio of 100:4(A:B); and de-airing the resultant mixture for 8 hours. |
