Tosoh' s curing agent

Japan TOSOH CORONATE 2604 (NPU C-2604) curing agent

Product introduction
CORONATE 2604 and CORONATE 2610 are aromatic/aliphatic polyfunctional isocyanates. The drying performance of CORONATE 2604 and CORONATE 2610 is slower than CORONATE 2030 but much faster than CORONATE L. CORONATE 2604 and CORONATE 2610 have better weathering properties than CORONATE L and CORONATE 2030. CORONATE 2604 is known for its improved weathering properties and CORONATE 2610 is used to improve drying properties.

General parameters

	CORONATE 2604	CORONATE 2610	Company A product
Exterior	light yellow liquid	light yellow liquid	light yellow liquid
NCO content (wt%)	10.6	10.6	10.5
Solid content (wt%)	60	60	60
Viscosity at 25°C (cP)	500	1200	（2200/23C）
Free TDI (wt%)	Max.0.2	Max.0.2	NA
Hue (Gardener)	Below 2	Below 2	NA
solvent	Butyl acetate	Butyl acetate	Butyl acetate

dry condition

	C-2604	C-2610	C-2030	C-L	Product“A”
Dry to touch (min)	7	6	3	35	8
Completely dry (min)	53	50	25	>100	52

Test Conditions

Polyol	Acrydic A-801, DIC product
NCO/OH	1/1 (mol)
Solid content in paint	50wt%
solvent	Butyl acetate/xylene = 1/1 (wt ratio)
Film thickness	25μ

Coating Test

	hardness	bond strength	Elasticity (mm)	Impact strength	Bending performance
C-2604	H	20/100	1.2	Max. 5cm	Passed
C-2610	H	30/100	1.2	Max. 5cm	Passed
C2030	H	0/100	1.0	Max. 5cm	Passed
C-L	F	100/100	1.0	20cm	Passed
Product“A”	H	30/100	1.0	Max. 5cm	Passed

Hardness: Pencil scratch test
Adhesive Strength: De-lamination Test in “cross cut method”
Elasticity: Ericksen
Impact Strength: Dupont method 1/2 inch x 1,000g
Bending performance: 4mmφ

Test Conditions

Polyol	Acrydic A-801, DIC product
NCO/OH	1/1 (mol)
Solid content in paint	40wt%
PWC	40wt% (TiO2, manufactured by Ishihara Sangyo Co., Ltd.)
solvent	Butyl acetate/Xylene = 1/1 (wt ratio)
Film thickness	30 μ 20C, 65%RH, for 1 week.