摘要:
An adduct is prepared by reacting (A) a compound containing at least one epoxy group per molecule, with (B) a compound containing at least one epoxide reactive group per molecule selected from the group consisting of phenolic, thiol, secondary amine and carboxyl; wherein (i) when compound (A) is a polyepoxide, compound (B) contains a single epoxide reactive group per molecule; (ii) when compound (A) is a monoepoxide it is a monoglycidyl ether and compound (B) contains at least two epoxide reactive groups per molecule; and (iii) at least one of components (A) and (B) contains a rodlike mesogenic moiety. These adducts are useful in the preparation of polyurethanes.
摘要:
The present invention relates to a polyisocyanate mixture containing isocyanate trimers provided thati) 30 to 100 mole percent of the trimers are iminooxadiazine diones B and ##STR1## ii) 0 to 70 mole percent of the trimers are isocyanurates A iii) less than 10 mole percent of the polyisocyanate mixture is of the uretone imine structural type, andiv) the ratio of the sum of the mole percents of trimers A and B to the mole percent of uretdiones is greater than 4:1whereinR.sup.1, R.sup.2 and R.sup.3 are the same or different and represent the groups obtained by removing an isocyanate group from an aliphatic, cycloaliphatic, aromatic and/or araliphatic isocyanate having an NCO content of less than 70% and/or their oligomers.The present invention also relates to a process for the preparation of these isocyanate trimers, mixtures of these isocyanate trimers with other polyisocyanates and compositions containing these isocyanate trimers, in which the isocyanate groups may optionally be blocked with blocking agents, and compounds containing two or more isocyanate-reactive groups.
摘要:
A polyurethane composition useful as a molding composition is prepared from (1) an adduct derived from the reaction product of a polyepoxide and a single epoxide reactive group-containing compound, or the reaction product of a monoglycidyl ether and an epoxide reactive groups-containing compound, (2) a polyisocyanate, and (3) optionally an isocyanate-reactive compound; wherein at least one of the adduct or polyisocyanate contains a rodlike mesogenic moiety.
摘要:
The present invention relates to a new organic heterocyclic isocyanate which is the reaction product of an organic diisocyanate and an amino or hydroxy nitrile. The invention also relates to a process of producing such isocyanates by reacting an excess of the diisocyanate with the nitrile under conditions under which the nitrile will not decompose and then maintaining the reaction mixture at an elevated temperature until the isocyanate nitrile adduct cyclizes. The reaction may be carried out in the presence of a catalyst for isocyanate addition reactions. Additionally, the invention relates to a process for the production of polyurethane by the reaction of the heterocyclic isocyanates with compounds carrying at least two isocyanate reactive hydrogen atoms per molecule.
摘要:
The present invention relates to a new organic heterocyclic isocyanate which is the reaction product of an organic diisocyanate and an amino or hydroxy nitrile. The invention also relates to a process of producing such isocyanates by reacting an excess of the diisocyanate with the nitrile under conditions under which the nitrile will not decompose and then maintaining the reaction mixture at an elevated temperature until the isocyanate nitrile adduct cyclizes. The reaction may be carried out in the presence of a catalyst for isocyanate addition reactions. Additionally, the invention relates to a process for the production of polyurethane by the reaction of the heterocyclic isocyanates with compounds carrying at least two isocyanate reactive hydrogen atoms per molecule.
摘要:
The present invention relates to a new organic heterocyclic isocyanate which is the reaction product of an organic diisocyanate and an amino or hydroxy nitrile. The invention also relates to a process of producing such isocyanates by reacting an excess of the diisocyanate with the nitrile under conditions under which the nitrile will not decompose and then maintaining the reaction mixture at an elevated temperature until the isocyanate nitrile adduct cyclizes. The reaction may be carried out in the presence of a catalyst for isocyanate addition reactions. Additionally, the invention relates to a process for the production of polyurethane by the reaction of the heterocyclic isocyanates with compounds carrying at least two isocyanate reactive hydrogen atoms per molecule.