摘要:
Novel amide acetals of the formula ##STR1## wherein R.sub.1 is hydrogen, methyl or Y and Y is the remnant of a hydroxyl-containing compound are claimed. The compounds are useful as water scavengers in fluid compositions.
摘要:
Certain tetrahydrocarbylphosphonium bicarbonate salts are produced by reacting a trihydrocarbyl(hydrocarbylcarboxymethyl)phosphonium hydroxide inner salt with water. For example, methyl tri-n-butylphosphonium bicarbonate salt was prepared in quantitative yields by heating tri-n-butylcarboxymethylphosphonium hydroxide inner salt in an aqueous methanol solution at 100.degree. C. for 3 hours.
摘要:
Compounds of formulas I and II are heat-activated catalysts used in making polyurethanes. ##STR1## wherein R, R.sub.1, and R.sub.2 are each independently H, hydrocarbyl or an inertly-substituted hydrocarbyl; R.sub.3 and R.sub.4 are each independently hydrocarbyl or an inertly-substituted hydrocarbyl; and X is an anion. Upon heating, Compounds I and II catalyze the reaction and may release gaseous by-products which cause the resulting polyurethane compound to foam. For example, the catalyst, t-butyl imidazole-N-carboxylate, when heated to 120.degree. C., catalyzes the reaction between a polyol and a polyisocyanate to give a foamed polyurethane which cured in 16 minutes.
摘要翻译:式I和II的化合物是用于制备聚氨酯的热活化催化剂。 其中R,R 1和R 2各自独立地为H,烃基或惰性取代的烃基; R 3和R 4各自独立地为烃基或惰性取代的烃基; X为阴离子。 加热时,化合物I和II催化反应,并可能释放导致所得聚氨酯化合物发泡的气态副产物。 例如,催化剂叔丁基咪唑-N-羧酸酯在加热至120℃时催化多元醇与多异氰酸酯之间的反应,得到在16分钟内固化的发泡聚氨酯。
摘要:
Tetrahydrocarbyl phosphonium bicarbonate salts are employed as catalysts to promote the reaction between (a) vicinal epoxides and (b) carboxylic acids or anhydrides. These catalysts are particularly useful in the preparation of vinyl ester resins.
摘要:
Novel epoxy resin compositions are disclosed which comprise (A) an epoxy resin, (B) a latent amine curing agent for said epoxy resin, and (C) a unique class of latent accelerators corresponding to formula I ##SPC1##wherein:X is an atom of oxygen or sulfur;n is 1 or 2;R.sub.1 is lower alkyl, chloro or bromo;R.sub.2 is hydrogen, lower alkyl, chloro or bromo; romo;R.sub.3 is hydrogen or an inert organic radical; orR.sub.1 and R.sub.2 or R.sub.3 can be joined to form a 5- or 6-membered carbocylic ring; and--NR.sub.4 R.sub.5 is the organic residue derived by the removal of the amino hydrogen atom from a secondary amine;With the proviso that at least one of the urea or thiourea substituents is located .alpha. on the benzene nucleus with respect to R.sub.1 ; andWith the proviso that when n is 2, I is the position isomer having the urea or thiourea substituents located .alpha.,.alpha.' on the benzene nucleus with respect to R.sub.1, or, I is a mixture of position isomers consisting essentially of at least about 35 percent of the aforesaid .alpha.,.alpha.' position isomer and up to about 65 percent of the .alpha.,.gamma. isomer.
摘要:
The trisubstituted (2,5-dihydroxyphenyl)phosphonium hydroxide inner salts and their hydrolyzed derivatives are novel latent catalysts for promoting reaction between vicinal epoxides and phenols and/or carboxylic acids (or anhydrides). Precatalyzed epoxy resins are easily prepared using such catalysts.
摘要:
Ar-cyclic sulfonium arenethiol salts exemplified by the formula: ##STR1## may be converted to their corresponding zwitterion, exemplified by the formula: ##STR2## The latter polymerize very readily upon exposure to mild conditions of heat or radiative energy. The resultant polymers are water-insoluble resins useful as adhesives, coatings, films and the like. The zwitterions containing more than one arenesulfide and cyclic sulfonium group per molecule, crosslink upon exposure to heat to form thermoset resins.
摘要:
Tetrahydrocarbyl phosphonium bicarbonate salts are described which are unexpectedly effective as catalysts for promoting the reaction between (a) vicinal epoxides and (b) phenols. These catalysts are particularly useful in preparing high molecular weight epoxy resins by the advancement reaction of an epoxy resin with a polyhydric phenol.
摘要:
The trisubstituted (2,5-dihydroxyphenyl)phosphonium hydroxide inner salts and their hydrolyzed derivatives are novel latent catalysts for promoting reaction between vicinal epoxides and phenols and/or carboxylic acids (or anhydrides). Precatalyzed epoxy resins are easily prepared using such catalysts.
摘要:
The trisubstituted (2,5-dihydroxyphenyl)phosphonium hydroxide inner salts and their hydrolyzed derivatives are novel latent catalysts for promoting reaction between vicinal epoxides and phenols and/or carboxylic acids (or anhydrides). Precatalyzed epoxy resins are easily prepared using such catalysts.