摘要:
This invention relates to an improved process for the preparation of polyisocyanates which contain biuret groups by the direct reaction of polyamines in vapor form with polyisocyanates.
摘要:
The instant invention is directed to a process for the continuous production of aromatic polyisocyanates containing uretdione groups. The process broadly comprising dimerizing an aromatic polyisocyanate in a continuous, coolable screw reactor at a temperature of from -30.degree. to +70.degree. C.
摘要:
The present invention relates to a process for the preparation of polyurethane foams capable of being flame laminated and high frequency welded, comprising reacting:(a) polyisocyanate,(b) a compound having a molecular weight of from 400 to 10,000 containing at least two isocyanate-reactive hydrogen atoms and(c) a dialkoxy-phosphonyl-N-alkyl-formic acid amide of the formula: ##STR1## wherein m represents an integer of from 1 to 3,n represents an integer of from 0 to 8,X represents halogen, hydrogen, C.sub.1 to C.sub.6 alkyl, --OR, or ##STR2## R represents C.sub.1 to C.sub.6 alkyl, R.sub.1 represents hydrogen, C.sub.1 to C.sub.10 alkyl, C.sub.1 to C.sub.10 alkylene, C.sub.6 to C.sub.10 aryl or C.sub.6 to C.sub.10 arylene, andR.sub.2 and R.sub.3, which may be the same or different, represent C.sub.1 to C.sub.10 alkyl in the presence of water and/or blowing agent.The present invention also relates to dialkoxy-phosphonyl-N-formic acid amides.
摘要:
This disclosure relates to a process for the preparation of alkoxymethylisocyanates by reacting alkoxylmethyl tri-substituted ureas with isocyanates which have higher boiling points than the alkoxy methyl isocyanates produced. The process is also applicable to alkenoxy methyl tri-substituted ureas to make the corresponding isocyanates. Ureas of commercial purity may be used to obtain good yields of isocyanate when between about 0.03 and 0.2 mol of carbodiimide groups are present per mol of urea group. The carbodiimide containing compounds may also carry free isocyanate groups, in which case they should have a boiling point above that of the isocyanate product.
摘要:
The present invention relates to a process for the preparation of polyurethane foams capable of being flame laminated and high frequency welded, comprising reacting:(a) polyisocyanate,(b) a compound having a molecular weight of from 400 to 10,000 containing at least two isocyanate-reactive hydrogen atoms and(c) a dialkoxy-phosphonyl-N-alkyl-formic acid amide of the formula: ##STR1## wherein m represents an integer of from 1 to 3,n represents an integer of from 0 to 8,X represents halogen, hydrogen, C.sub.1 to C.sub.6 alkyl, -OR, or ##STR2## R represents C.sub.1 to C.sub.6 alkyl, R.sub.1 represents hydrogen, C.sub.1 to C.sub.10 alkyl, C.sub.1 to C.sub.10 alkylene, C.sub.6 to C.sub.10 aryl or C.sub.6 to C.sub.10 arylene, andR.sub.2 and R.sub.3, which may be the same or different, represent C.sub.1 to C.sub.10 alkyl in the presence of water and/or blowing agent.The present invention also relates to dialkoxy-phosphonyl-N-formic acid amides.
摘要:
The present invention relates to aqueous compositions containinga) bis(1,3,4-oxadiazolin-5-ones) corresponding to formula (I) ##STR1## wherein R represents a single bond or a divalent aliphatic, araliphatic or aromatic radical having 1 to 18 carbon atoms andb) organic polyamines or polyamine blends having an average of more than 2 NH-- and/or NH.sub.2 -- groups.The present invention also relates to coatings, adhesives or sealants prepared from these aqueous compositions, in particular automotive clear coats.
摘要:
The present invention relates to a process for preparing an isocyanate group-containing allophanate corresponding to formula (I) ##STR1## wherein R represents the residue obtained by removing the isocyanate groups from a (cyclo)aliphatic or araliphatic diisocyanate,Y represents the represents an m-valent residue obtained by removing the hydroxyl groups from a (poly)hydroxyl compound having m OH groups andn and m are the same or different and have a value of 1 to 5, by reacting an isocyanate group-containing oxadiazinetrione with a primary alcohol in the presence of a basic catalyst having a pKa value of >6.
摘要:
The present invention relates to a process for the preparation of polyurethanes suitable for use as thickeners for aqueous compositions by reacting at an NCO/OH equivalent ratio of 0.9:1 to 1.2:1a) a polyether component having an OH number of 10 to 30 mg KOH/g and obtained by the alkoxylation of a mixture ofa1) 30 to 80 mole % of a monofunctional alcohol or alkylphenol having 8 to 30 carbon atoms,a2) 2 to 10 mole % of sodium hydroxide or potassium hydroxide,a3) 10 to 60 mole % of water anda4) 0 to 10 mole % of a trihydric to hexahydric alcohol having a molecular weight of 92 to 600, with ethylene oxide or a mixture of ethylene oxide with up to 20 mole %, based on the total moles of alkylene oxides, of propylene oxide, in which the percentages of a1) to a4) add up to 100,withb) a polyisocyanate component containing at least one organic diisocyanate, optionally in admixture with up to 20 mole %, based on the total moles of component b), of higher than difunctional polyisocyanates.The invention also relates to the polyurethanes obtainable by this method and their use, optionally in combination with other thickeners, for the thickening of aqueous systems.
摘要:
Low-fog flexible polyester polyurethane foams are produced by reactinga) polyisocyanates, withb) polyesters containing at least two hydroxyl groups and having a molecular weight in the range from 400 to 10,000, in the presence ofc) water and/or readily volatile organic compounds as blowing agentswherein prior to reacting, the polyesters have been subjected to continuous distillation over an average holding time of 2 to 600 s, at a temperature of 160.degree. to 250.degree. C., and under a pressure of 0.05 to 10 mbar.The reaction mixture may optionally contain d) compounds containing at least two active hydrogen atoms and having a molecular weight in the range from 32 to 400 as chain-extending and crosslinking agents, and/ore) auxiliaries and additives known per se.These low-fogging polyester polyurethane foams are extremely suitable for use in vehicles, preferably automobiles.
摘要:
Herbecidal substituted 4,5-diamino-1,2,4-triazol-3-(thi)ones of the formula ##STR1## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each independently is hydrogen or and organic radical,X is O or S, andY is O or S.There are also provided novel intermediates of the formula ##STR2##