Trimellitic anhydride acid chloride

Trimellitic anhydride acid chloride was purified by reduced pressure distillation. 

Poly (2,4-d if luoro-1,5, pheny lene t r ime 11 i t ic amide-imide) was prepared by a two-step procedure 12 At the first step, the polyamic acid was prepared by reacting 2,4-difluoro-1,5-phenylene diamine with trimellitic anhydride acid chloride (with the mole ratio of one to one) in anhydrous N,N-dimethylacetaraide at room temperature under nitrogen. After reaction, the polymer was poured into water and precipitated. After filtration, the white solid was washed with distilled water and dried in a vacuum oven. The poly(amide-imide) was obtained from heating the polyamic acid at 220°C for 3 hours. The polyamic acid was dissolved in N,N-dimethyl acetamide or N,N-dimethyl forraamide, cast on glass plates, and the solvent evaporated in a vacuum oven to form a polyamic acid film before heating at 220°C. 

ODA). These polymers are characterized by excellent high temperature properties with Tgs typically above 270 °C and continuous service temperatures of about 230 °C. The PAIs utilized here for blending studies were prepared by a simple solution polymerization route, i.e., by reacting trimellitic anhydride acid chloride and 6FDA and diamine monomer (ODA and MDA) in an appropriate solvent (e.g., DM Ac). 

The catalyst system consists of (PhCN)2PdCl2 and a phosphine or amine cocatalyst. The cocatalyst is necessary for the reaction, except in the case of the most reactive acid chlorides, such as trimellitic anhydride acid chloride or m-nitrobenzoyl chloride. Although both phosphine and amine cocatalysts are effective in the system, greater reaction rates are observed with phosphines. The reaction does not proceed in the same manner for aliphatic acid chlorides. 

Under certain conditions, aroyl chlorides are converted to arylsilanes by the reaction with disilanes. The oxidative addition of aroyl chloride and decarbonylation are followed by transmetallation and reductive elimination to give aryl silanes. Neat trimellitic anhydride acid chloride (377) reacts with dichlorotetramethyldisilane (376) at 145 °C to generate 378, which affords 4-chlorodimethylsilylphthalic anhydride (379) by reductive elimination. Finally it was converted to 380 and used for polyimide formation [185], Biphenyltetracarboxylic anhydride 381 is obtained at a higher... 

C8H18N202 1,4-bis(2-hydroxyethyl)piperazine 122-96-3 25 00 1.0295 2 15775 C9H3CI04 trimellitic anhydride acid chloride 1204-28-0 25.00 1.5463 2... 

Disilanes have been used in stoichiometric amounts as reductants in the palladium-catalyzed coupling of electron deficient aryl chlorides. By this procedure, trimellitic anhydride acid chloride (70) was converted to the high temperature polymer precursor biphenyl dianhydride (71) in 85% yield with concomitant decarbonylation (see Scheme 35 [128]). 

The prepolymer approach which worked well for piperazineamide interfacial membranes was not useful in the case of FT-30 and its analogs. Poor solubility of aromatic amide precursors in aqueous media was the main obstacle. A patent application has appeared on the use of prepolymer formed from 1,3-benzenediamine and trimellitic anhydride acid chloride.66 This prepolymer contains a free carboxylate group and is soluble in water as the sodium salt. A membrane is obtained by reaction of this intermediate with trimesoyl chloride, followed by a curing step at 110° to 130°C. Salt rejections of 98.5 to 99.1% on 2,000 ppm sodium chloride solution at 200 psi were obtained fluxes were 4 to 11 gfd. 

PC end-capped with trimellitic anhydride acid chloride, then reactively blended with PA-6 and MBS moldability, excellent Izod impact strength, and elongation Hathaway and Pyles, 1988, 1989... 

PPE/PPS/core-shell MBS or SEES PPE reacted with trimellitic anhydride acid chloride and dimethyl-n-butylamine Dekkers, 1994... 

The reactive methods of compatibili2ation developed subsequently allowed the second generation Noryl (a blend of PPO with PA) to be developed. The compositions claimed usually cover 30-70% of each of the main ingredients, PPO and PA, with additionally up to four parts of such modifier as polycarboxylic acid, trimellitic anhydride acid chloride, quinine, oxidized polyolefin wax, and so on. In most cases, PA forms a matrix with spherical inclusions of PPO acting as compatibilized low-density filler. 

Benzoate end capped PPE can be readily prepared by allowing the terminal hydroxyl groups of PPE to react with benzoyl chloride in chloroform. Trimellitic anhydride groups can be introduced by the reaction with trimellitic anhydride acid chloride. This reagent is used for the com-patibilization of PPE with poly(amide) (PA). Several other related acid chlorides have been proposed for the functionalization of PPE. ... 

PPE capped with trimellitic anhydride acid chloride and blended with PA-66 Toughened by addition of SEES Aycock and Ting 1994... 

PA/PC blends have also been compatibilized by block copolymer formation through reactiffli of PA amine end-groups with PC anhydride end-groups (Hathaway and Pyles 1988, 1989). PC phenolic end-groups were anhydride-functionalized by reaction with trimellitic anhydride acid chloride. Extruded blends of PA-6 and PC were characterized by selective solvent extraction and mechanical properties of test parts. An amorphous polyamide could also be compatibilized with PC using this strategy. 

Campbell et al. (1990) have reported properties for compatibilized PA-PPE blends made using anhydride-terminated PPE. Anhydride-terminated PPE was made by capping PPE phenolic end-groups with trimellitic anhydride acid chloride in solution. A block copolymer may form between PA amine end-groups and PPE-anhydride during subsequent melt mixing. For example, a blend containuig 49 parts... 

PA/PS blends have also been compatibilized through block copolymer formation between amine-terminated PA and anhydride-terminated PS. Anhydride end-groups were introduced into PS through reaction of either anion-terminated PS or hydroxy-terminated PS with trimellitic anhydride acid chloride. For example, Park et al. (1992) blended 80 parts PA-6 with 10-16 parts PS and 4-10 parts anhydride-terminated PS in an internal mixer at 240 °C. The blends were characterized by torque rheometiy, SEM, selective solvent extraction, DSC, morphological stability to annealing, and lap shear adhesion. The effect of mixing protocol on properties was studied. Properties were also compared to those for blends compatibilized by added PA-PS graft copolymer that had been synthesized in a separate step. 

Lee and Park (2000) found evidence for copolymer formation in blends of anhydride-terminated PC and oxazoline-functionalized PS prepared in a Haake mixer. Blends were characterized by torque rheometry, SEM, FTIR, NMR, and mechanical properties. Anhydride-terminated PC was prepared by reaction of PC phenolic end-groups with trimellitic anhydride acid chloride (cf. Hathaway and Pyles 1988, 1989). 

A means of attaching substantial quantities of fluorocarbon is via an ester linkage, and some fluorinated aliphatic ester derivatives of trimellitic anhydride acid chloride have been previously reported. ... 

Benzyl alcohol and anhydrous pyridine in an inert solvent sudi as benzene, toluene, or ethanol-free chloroform added dropwise to a chilled stirred soln. of trimellitic anhydride acid chloride in benzene-toluene benzyl trimellitate anhydride. Y 79%. F. e., also carbaryloxy analogs from phenols, s. I. Puskas and E. K. Fields, Ind. Eng. Chem., Prod. Res. Develop. 9, 403 (1970). 

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