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64249-50-9

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64249-50-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 64249-50-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,2,4 and 9 respectively; the second part has 2 digits, 5 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 64249-50:
(7*6)+(6*4)+(5*2)+(4*4)+(3*9)+(2*5)+(1*0)=129
129 % 10 = 9
So 64249-50-9 is a valid CAS Registry Number.

64249-50-9Relevant articles and documents

Accelerating effects of N-aryl-N′,N′-dialkyl ureas on epoxy-dicyandiamide curing system

Liu, Xiang Dong,Kimura, Mika,Sudo, Atsushi,Endo, Takeshi

, p. 5298 - 5305 (2010)

This report focuses on epoxy-dicyandiamide (DICY) curing system accelerated by N-aryl-N′,N′-dialkyl urea, aiming at clarifying the accelerating mechanism and the relationship between accelerating effect and molecular structure of the accelerators. Nine N-aryl-N′,N′-dialkyl ureas were synthesized and investigated with measurements of differential scanning calorimetry, thermo gravimetric/differential thermal analysis and NMR spectroscopy. The results revealed that the ureas released the corresponding secondary amines by the thermal dissociation in the presence of epoxide, which led to the formation of tertiary amines that catalyze the addition reaction of DICY to epoxide. Moreover, a tendency that the ureas able to release more compact amines exhibited higher acceleration effects was discovered.

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