Coating film
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsEiko Tanaka, Koichiro Azuma
Life of this patent
Estimating the term…
Abstract
The present invention provides a coating film having a structure represented by the following general formula (1) (in the formula, R11 is a residue formed by removing one isocyanate group from a polyisocyanate, and R12 is an alkyl group or an alkoxy group having 2 to 12 carbon atoms, R13 is a residue formed by removing one hydroxyl group from a polyol), wherein a König 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.
Claims9
A coating film having a structure represented by the following general formula (1), wherein
- a König 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,
- 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,
- the coating film is formed by curing a coating composition containing a blocked polyisocyanate component and a polyol,
- in the coating composition, a molar ratio of the isocyanate group of the blocked polyisocyanate component to a hydroxyl group of the polyol is 0.4 or more and 2.0 or less, and
- the blocked polyisocyanate component contains a blocked polyisocyanate obtained from a polyisocyanate and a compound represented by the following general formula (3),
- wherein, in (the general formula (1), R11 is a residue formed by removing one isocyanate group from any one of isocyanurate-type polyisocyanates, biuret-type polyisocyanates, urethane-modified isocyanurate-type polyisocyanates, and allophanate-type polyisocyanates, R12 is a secondary alkoxy group or a tertiary alkoxy group having 2 to 12 carbon atoms, R13 is an alkyl group,
- wherein, in the general formula (3), R31 is an alkyl group, and R32 is a secondary alkoxy group or a tertiary alkoxy group having 2 to 12 carbon atoms.
A method for producing a coating film, comprising:
- applying a coating composition containing a blocked polyisocyanate component and a polyol and drying at 100 to 200° C. for 10 to 60 minutes or at 70 to 90° C. for 1 to 14 days, wherein
- in the coating composition, a molar ratio of the isocyanate group of the blocked polyisocyanate component to a hydroxyl group of the polyol is 0.4 or more and 2.0 or less, and
- the blocked polyisocyanate component contains a blocked polyisocyanate obtained from a polyisocyanate and a compound represented by the following general formula (3),
- wherein, in (the general formula (3), R31 is an alkyl group, and R32 is a secondary alkoxy group or a tertiary alkoxy group.
Dependencies are inferred from the claim text.