Dibutyltin laurate

Organotins are used as catalysts in room temperature vulcanization via a condensation reaction. Dibutyltin laurate is the most commonly used organotin catalyst for this application. It is typically used at between 0.01% and 0.1% by weight. Between 50 and 100 tonnes of organotin catalysts were used in the production of silicones in the EU in 2000 (ETICA, 2002). 

Dibutyltin laurate 23% degradation in 39 days Not readily biodegradable ... 

The reaction of 4-chloro-2-pentene with dibutyltin dilaurate, one of the first to be studied, provided some interesting observations. A plot of liberated chlorine vs. time (Figure 1) shows the reaction to be auto-catalytic. Investigation led to the discovery that dibutyltin dichloride, a product of the stabilization reaction, is a catalyst for the reaction (Figure 1). Further investigation revealed that at the outset all the reaction takes place by the unimolecular decomposition of the allylic chloride and that not until species with tin—chlorine bonds are present does this stabilizer undergo reaction with the allylic chloride. The reactive stabilizer in this instance is dibutyltin laurate chloride. Dibutyltin dilaurate does not react with the allylic chloride, and dibutyltin dichloride, which is very reactive,... 

Diepoxyethylbenzene was first prepared by Everett and Kon (3) as a liquid which evidently was not pure because analysis showed a difference of 4% in the carbon content. Our product was a white crystalline mass with melting point 79°C. and boiling point 95°C. at 0.06 mm. Catalytic hydrogenation gave the theoretical absorption. The stabilizing effect in PVC mixtures was about 30% of dibutyltin laurate—i.e., 3.3 times more of the stabilizer is necessary to obtain the same discoloration as dibutyltin laurate in a plasticized mixture of PVC with 30% dioctylph-thalate at 200°C. for 20 minutes. 1,3,5-Triacetylbenzene was prepared by the two methods mentioned above. 

Di(epoxyethyl)diphenyl was obtained from diphenyl by Friedel-Crafts reaction with chloracetyl chloride. Meerwein-Ponndorf reduction gave the dichlorohydrin, and treatment with alcoholic potassium hydroxide gave 97% of the theoretical yield of diepoxide, (f.p., 161 °C.). The stabilizing effect was about one-fourth that of dibutyltin laurate. 

The practical stability tests of these epoxides showed that there is a relationship between the number of epoxide groups and the stabilizing effect, but this behavior does not occur in all cases. Thus, for example, the epoxides of the Diels-Alder adducts of butadiene are not as effective as the diepoxides of diphenyl. The best effects were obtained with 1,3,5-triepoxyethylbenzene (ca. half the effect of dibutyltin laurate). Unfortunately, the stability of this product on storage is not satisfactory. After four weeks standing at normal temperature a considerable part of the... 

BIS(LAUROYLOXY)DI(n-BUTYL)STANNANE BUTYNORATE DBTL DIBUTYLBIS(LAUROYLO-XY)TIN DI-n-BUTYLTIN DipODECANOATE) DIBUTYLTIN DILAURATE (USDA) DIBUTYLTIN LAURATE DIBUTYL-ZINN-DILAURAT (GERMAN) FOMREZ SUL-4 LAUDRAN DI-n-BUTYLCINICITY (CZECH) LAURIC ACID, DIBUTYLSTANNYLENE derivative LAURIC ACID, DIBUTYLSTANNYLENE S.YLT... 

DIBUTYLTIN DIOLEATE see DEJOOO DI-n-BUTYLTIN DIPENTANOATE see DEA600 DIBUTYLTIN LAURATE see DDV600 DIBUTYLTIN MERCAPTOPROPIONATE see DEJ200 DIBUTYLTIN-0,S-MERCAPTOPROPIONATEsee DEJ200... 

Dibutyltin laurate Laurie acid, dibutylstannylene salt Tin dibutyl dilaurate Empirical C32H6404Sn Formula (C4H9)2Sn(OCOCioH2oCH3)2 Properties Clear pale yel. liq. or solid sol. in ketones, esters, acetone, benzene, aromatic soivs. insol. in water, alcohol m.w. 631.56 dens. 1.066 m.p. 23 C f.p. 8 C flash pt. 440 F ref. index 1.4710... 

Dibutyltin laurate. See Dibutyltin dilaurate Dibutyltin maleate... 

The detailed investigation of this process was done using two types of semi-IPNs made of cross-linked PU and linear PBMA [202]. The difference between these two cases is that in one case the previously polymerized PBMA was introduced into the reaction mixture for PU network formation, whereas in the other case the reactions of PU formation and BMA polymerization proceeded simultaneously. PU based on POPG and TDI-TMP adduct was formed under the action of dibutyltin laurate (catalyst). The kinetics of PU network formation and BMA polymerization were studied by calorimetry. The kinetic parameters of the reaction for pure PU and for PU in the presence of the second component were found from equation of the second-order reaction ... 

---