Methylhexahydrophthalic anhydride

Methylhexahydrophthalic anhydride (MHHPA) hardener, 10 17 Methyl hydroperoxides, decomposition hazards of, 18 490... 

Af-Methylguanidine acetic acid, c277 4-Methylhexahydrophthalic anhydride, ml 96 Methyl hydroxyacetate, m259... 

If in the 0 segment in Fig. 1 the alkyl group is replaced by an aryl group, e.g., EDA by DDM, or Sue A by methylhexahydrophthalic anhydride (MeHHPA), K2 becomes higher, the rigidity of the main chain increases, and Tg becomes higher (Table 1). 

Mercaptoethanol Methyl glycol chitosan 4-Methylhexahydrophthalic anhydride A-Methylisatoic anhydride... 

Kanerva L, Hyry H, Jolanki R, et al. Delayed and immediate allergy caused by methylhexahydrophthalic anhydride. Contact Dermatitis 1997 36(1) 34—8. 

The hardener portion (Part B) may also be mixed with fillers, diluents, solvents, and other additives. Fillers may be mixed in the resin portion alone or partly in the resin and partly in the hardener portion. Adhesion promoters such as Dow Corning A-180 silane may also be added to enhance the adhesion of the filler particles to the resin or hardener. Examples include several electrically conductive epoxy formulations that were used to evaluate their electrical stability on non-noble metal surfaces. The base epoxy resin was the diglycidylether of bisphenol-F (DGEBF, equivalent wt. = 170 g). Methylhexahydrophthalic anhydride, hexahydrophthalic anhydride, and 4-methylphthalic anhydride were evaluated as curing agents with 4-methylimidazole as a catalyst. The manufacturing procedure was ... 

Methyl endo-methylene-tetrahydrophthalic anhydride Methylhexahydrophthalic anhydride (MHHPA) [19438-60-9] Methyl nadic anhydride [25134-21-8]... 

A few reports of contact allergy to non-amine hardeners have been published in the case of dicy-andiamide (Senff et al. 1988), dodecenyl succinic anhydride (Goransson 1977), methylhexahydrophthalic anhydride (Kanerva et al. 1997), hexavalent chromate, an accelerator additive (Handley and Burrows 1994 Bruze et al. 1996) and polysulfides (Bruze et al. 1996). 

Kanerva L, Jolanki R, Estlander T (1996c) Offset printer s occupational allergic contact dermatitis caused by cobalt-2-ethylhexoate. Contact Dermatitis 34 67-68 Kanerva L, Hyry H, Jolanki R, Hytdnen M, Estlander T (1997) Delayed and immediate occupational allergy caused by methylhexahydrophthalic anhydride. Contact Dermatitis 36 34-38... 

Methylhexahydrophthalic anhydride (MHHPA) is an epoxy hardener, irritant to skin and mucus membranes. It is included in non-diglycidyl-ether-of-bis-phenol-A epoxy resins. It can induce both allergic contact dermatitis and immunologic contact urticaria. MHHPA is structurally close to methyltetrahydro-phthalic anhydride (MTHPA), which can also cause sensitization. 

Tarvainen K, Kanerva L, Jolanki R, Estiander T (1995a) Occupational dermatoses from the manufacture of plastic composite products. Am J Contact Dermat 6 95-104 Tarvainen K, Jolanki R, Estiander T, Tupasela 0, Pfaffli P, Kanerva L (1995b) Immunologic contact urticaria due to airborne methylhexahydrophthalic and methyl tetrahydro-phthalic anhydrides. Contact Dermatitis 32 204-209... 

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