Asahi Kasei Kabushiki Kaisha

Eiko Tanaka

Yuichi Miwa

Masakazu Yamauchi

Hironori Katagawa

Koichiro Azuma

Kie Shinomiya

Misa Horinouchi

Masatsugu Higashi

Tomoharu Yoshinuma

A blocked polyisocyanate composition containing a blocked polyisocyanate obtained from a polyisocyanate and at least one blocking agent, wherein the blocking agent contains a compound represented by general formula (I) shown below, and the amount of methane tetracarbonyl structures represented by general formula (II) shown below, relative to the total molar amount within the blocked polyisocyanate of bonded structures in which the compound represented by general formula (I) is bonded to the polyisocyanate, is at least 0.5 mol % but not more than 10 mol %.

Blocked polyisocyanate composition and use thereof

The present invention provides a coating film having a structure represented by the following general formula (1) (in the formula, Ris a residue formed by removing one isocyanate group from a polyisocyanate, and Ris an alkyl group or an alkoxy group having 2 to 12 carbon atoms, Ris a residue formed by removing one hydroxyl group from a polyol), wherein a K&#xf6;nig hardness of the coating film is 20 or more, in an SS curve measurement of a tensile test, the coating film has an elastic deformation region and a plastic deformation region, and in the SS curve measurement, a stress at an inflection point stress between the elastic deformation region and the plastic deformation region is 5 MPa or more. 

Coating film

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Tokyo, Japan

Eiko Tanaka