Methylene-bis-o-chloroaniline

Curalon [Uniroyal]. TM for a series of urethane curatives. Curalon L, a mixture of hindered aromatic primary diamines. Curalon M, p,p methylene-bis(o-chloroaniline). 

A significant effort has been carried out in recent years on chain extenders for urethane elastomers. This has been prompted primarily by the search for a suitable replacement for 4,4 -methylene bis(o-chloroaniline) (MOCA), a widely used chain extender and curing agent which gives a positive Ames test (screening test for mutagenicity). 

Prepolymers of polybutadiene diol (M. 2500), polytetramethylene oxide diol (M. 1400 and M. 2100), and prepolymer of polypropylene oxide diol (M. 1400) were used to obtain segmented elastomers SPU-1 to SPU-5. Prepolymers were prepared by reaction of appropriate diol with 2,4-toluene diisocyanate (2 moles per one mole of diol). Prepolymers of polytetramethylene oxide diol (elastomers SPU-1 and SPU-4) were cured by methylene-bis-o-chloroaniline, MOCA, or by mixture of MOCA and polytetramethylene oxide diol (SPU-2 and SPU-3). SPU-5 samples, prepared from prepolymer of polypropylene oxide diol, were cured by MOCA, and prepolymer of polybutadiene diol was cured by a mixture of MOCA and polytetramethylene oxide diol (SPU-6). Various concentrations of hard segments, Cj, in SPU were set by a ratio of mixture components and molecular weight of prepolymer (Table 10.14). Excess of NCO-groups was in the range 1.03-1.06 for SPU-1 to SPU-5 and 0.99 for SPU-6. All samples were cured at 80°C for 4 days. The... 

EFFECT OF MOLECULAR WEIGHT AND POLYOL TYPE ON THE PROPERTIES OF POLYURETHANE ELASTOMERS USING DIPHENYLMETHANE DIISOCYANATE AND METHYLENE BIS(O-CHLOROANILINE)... 

The 2003 ACGIH threshold limit valuetime-weighted average (TLV-TWA) for 4,4 -methylene bis(2-chloroaniline) is 0.01 ppm (O.llmg/m ) with an A2-suspected human carcinogen designation and a notation for skin absorption. 

Linch AL, O Conner GB, Barnes JR, et al Methylene-bis-orfl5o-chloroaniline (MOCA) Evaluation of hazards and exposure control. Am Ind Hyg Assoc J 32 802-819, 1971... 

SYNS BIS AMINE CURALIN M CURENE 442 CYANASET DI(-4-AMINO-3-CHLOROPHENYL)METH-ANE DI-(4-AMINO-3-CLOROFENIL)METANO (ITALIAN) 4,4 -DIAMINO-3,3 -DICHLORODIPHENYL-METHANE 3,3 -DICHLOR-4,4 -DIAMINODIPHENYL-METHAN (GERMAN) 3,3 -DICHLORO-4,4 -DIAMINODIPHENYLMETHANE 3,3 -DICLORO-4,4 -DIAMINODIFENILMETANO (ITALIAN) MBOCA METHYLENE-4,4 -BIS(o-CHLOROANILINE) p,p -METHYLENEBIS(a-CHLOROANTLINE) p,p -METHYL-ENEBIS(o-CHLOROANILINE) 4,4 -METHYLENE(BIS)-CHLOROANILINE 4,4 -METHYLENEBIS(o-CHLORO-ANILINE) 4,4 -METHYLENEBIS-2-CHLOROBENZ-ENAMINE METHYLENE-BIS-ORTHOCHLOROANIL-... 

Difluoroaniline 4,4 -Methylene bis(2-chloroaniline) 4,4 -Methylenedianiline 4,4 -Oxi dianiline p-Phenylenediamine w-Toluidine o-Toluidine w-Xylenediamine Amines, Aromatic, Secondary and Tertiary... 

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