Open-celled rigid foams based on isocyanate

Details Open-celled rigid foams based on isocyanate Open-celled rigid foams based on isocyanate

C - Chemistry, Metallurgy

08

G

C08G 18/68 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01) C08J 9/14 (2006.01)

Patent

CA 2245009

In a process for producing open-celled rigid foams by reacting a) polyisocyanates with b) compounds containing hydrogen atoms which are reactive toward isocyanates, in the presence of c) water, d) if desired, organic compounds acting as physical blowing agents, e) catalysts, auxiliaries and/or additives, the compounds containing reactive hydrogen atoms used are substances having the structure I: Image where m is 0 - 15 n is 0 - 1 o is 0 - 15 p is 0 - 1 q is 0 - 15 r is 0 - 1 s is 0 - 15 t is 0 - 1 u is 0 - 10 v is 0 - 15 x is 1 - 5 y is 1 - 4 or mixtures of 1 - 3 where r + n ~ 0 z is 0 - 3 z i is 0.1 -3 R1 is an aliphatic structure without OH groups based on the structure of polyhydric alcohols, preferably ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol and dipropylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, 1,3-butanediol, trimethylolpropane, trimethylolethane, glycerol, pentaerythritol, where these substances can also be used in the esterification as any mixture among one another and R1 can therefore also be a mixture of the corresponding structures, R2 is the radical of a polycarboxylic acid without COOH groups, eg. adipic acid, terephthalic acid, o-phthalic acid, R3 is an alcohol radical like R1.

Divulgation d'un procédé de production de mousses rigides poreuses comprenant la réaction : a) de polyisocyanates, avec b) des composés renfermant des atomes d'hydrogène capables de réagir avec un isocyanate, en présence c) d'eau, d) si on le désire, de composés organiques agissant comme des agents d'expansion et e) de catalyseurs, d'auxiliaires et/ou d'additifs. Les composés renfermant des atomes d'hydrogène réactifs utilisés sont des substances de structure I, Image , dans laquelle : m = 0-15; n = 0-1; o = 0-15; p = 0-1; q = 0-15; r = 0-1; s = 0-15; t = 0-1; u = 0-10; v = 0-15; x = 1-5; y = 1-4 ou des mélanges dans lesquels y = 1-3 et r + n 0; z = 0-3; zi = 0,1-3; R1 est une structure aliphatique ne comportant aucun groupement OH, provenant d'une structure de polyalcool, de préférence une structure d'éthylèneglycol, de diéthylèneglycol, de triéthylèneglycol, de 1,2-propylèneglycol, de dipropylèneglycol, de 1,4-butanediol, de 1,6-hexanediol, de néopentylglycol, de 1,3-butanediol, de triméthylolpropane, de triméthyloléthane, de glycérol, de pentaérythritol ou d'une combinaison de ces structures, et obtenue par estérification de n'importe quel mélange de ces substances; R2 est le radical correspondant à un acide polycarboxylique sans groupement COOH, comme p. ex., l'acide adipique, l'acide téréphtalique ou l'acide o-phtalique; et R3 est un radical d'alcool du type de R1.

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