专利名称：COPOLYMERS OF FORMALDEHYDE AND A MIXTURE OF DICARBONALS诸葛亮当军师
发明人：HENRI SIDI
朱子家训读后感申请号：US52395466
幼儿园管理系统
学长学姐申请日：19660201
陆军防化学院公开号：US3428606A
公开日：
19690218
演讲内容
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扬汤止沸的意思
摘要：A copolymer of molecular weight 10,000 to 100,000 contains in its structure (a) recurring oxymethylene groups and (b) from 0.01 to 7% of at least one recurring group derived from acetate having the formulae wherein R0 is an alkylene, substituted alkylene, arylene or aralkylene radical; R1 and R2 are each a hydrogen atom, a C1- 4 alkyl group, an aryl group, a halo-substituted aryl group, or an aralkyl group; R3, R4, R5 and R6 are each hydrogen atom, a C1- 12 alkyl group, an aryl group or an aralkyl group; m is 0, 1, 2 or 3; n is 0 or 1, and X is a halogen atom or an alkyl group having 1 to 4 carbon atoms. Terpolymers containing cyclic ethers, dialdehydes, diketones and alkylene dicarboxylates,preferably in amount from 0.2 to 3% of the terpolymer may also be prepared. The copolymers are prepared by contacting formaldehyde or thioxane with 0.05 to 20% of at least one acetal of the above formulae. The polymerization may take place in the prence of the usual polymerization initiators, particularly uful being boron trifluoride diethyl and di-n-butyl ethereates, in liquid reaction media, batchwi or continuously, under non-oxidizing conditions in the prence of an antioxidant. The initiator may be neutralized after polymerization and the product capped, e.g. by acylation, etherification, and cyanoethylation or otherwi stabilized such as by partial
depolymerization. Examples are given of the polymerization of trioxane with (1) to (5) glyoxal-bis-(et
hylene glycol acetal) in cyclohexane with borontrifluoride diethyl etherate as catalyst; (6) pyruvaldehyde-bis -(ethylene glycol acetal), (6) malonaldehyde-bis -(ethylene glycol acetal), (7) glutaraldehyde - bis - (ethylene glycol acetal), (9) and (10) glyoxal - bis - (ethyleneglycol acetal) in 1,3-dioxolane and cyclohexane using the same catalysts, (11) glyoxal-bis-(1,3-propanediol acetal and glyoxal - bis - (neopentyl glycol acetal), (12) glyoxal - bis - (neopentyl glycol acetal) and 1,3-dioxolane and of formaldehyde with (13) glyoxal - bis - (ethylene glycol acetal) and also containing (14) 1,3-dioxolane and of trioxane with (19) glyoxal-bis-(ethylene glycol acetal) and 2-phenyl-1-3-dioxolane, (20) 2-phenyl-1,3-dioxolane and 1,3-dioxolane and (21) 2-phenyl-1,3-dioxolane.
申请人：TENNECO CHEM. INC.
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