摘要:
A polyurethane-based reactive mass composed of(a) at least one organic compound in the molecular weight range of from 400 to 12000 containing isocyanate reactive groups and having a functionality from 2 to 8,(b) optionally an organic compound in the molecular weight range of from 62 to 399 containing isocyanate reactive groups and having a functionality from 2 to 8.(c) catalysts,(d) aliphatic isocyanate compounds and(e) optionally other auxiliary agents and additives known per se,characterized in that the aliphatic isocyanate compound used is one based on hexamethylene diisocyanate, hydrogenated diphenylmethane diisocyanate or isophorone diisocyanate containing isocyanurate and/or uretdione units and/or urethane and/or uretoneimine and/or oxadiazatrione groups is suitable for the production of lightfast coatings, including coatings in light colors, in particular for the formation of edgings round wooden panels without these panels having first to be dried down to the maximum dampness of 7% by weight.
摘要:
The present invention relates to N,N'-bis-(4-isocyanatocyclohexyl)urea obtained from the reaction with water of cyclohexane-1,4-diisocyanate having a high trans isomer content. This invention further relates to the process for preparing the N,N'-bis(4-isocyanatocyclohexyl)urea and to its use in the synthesis of polyurethanes.
摘要:
This invention relates to a process for the production of polyurethanes, particularly polyurethane foam moldings having a compact skin and a cellular core, using special tin activators.
摘要:
This invention relates to new tetrahydropyrimidines, to a process for their production and to their use as catalysts in the production of polyurethane plastics, including polyurethane foams.
摘要:
Compounds having both s-triazine units and epoxide groups present are prepared by reacting an epoxide containing an isocyanate-reactive group with a triisocyanate corresponding to the formula: ##STR1## in which X is as defined herein. These reactants are used in quantities such that the equivalent ratio of isocyanate groups to isocyanate-reactive groups is maintained at less than or equal to 1 to 1. The compounds thus produced are particularly useful as reactive cross-linkers in the production of polyurethanes and polyepoxides.
摘要:
This invention relates to a process for the preparation of compounds which contain s-triazine units and isocyanate groups or isocyanate-reactive groups and which melt without decomposition, by the reaction of triisocyanates containing s-triazine units with compounds containing isocyanate-reactive groups, and the use of these products as fillers which can be chemically fixed in the production of polyurethanes by the isocyanate polyaddition process.
摘要:
The present invention relates to the preparation of powdered heat-curable reaction mixtures in which melt suspension of (a) solid polyisocyanates having melting points above about 60.degree. C., (b) molten high molecular weight isocyanate-reactive compounds having molecular weights of from 400 to 10,000 that have melting or softening points of 50.degree. C. to 150.degree. C., and (c) optionally, solid or liquid low molecular weight chain-extending or crosslinking compounds having molecular weights of from 62 to 399, are added to an inert solvent containing an emulsifier, thereby forming powdered heat-curable reaction mixtures in which components (a), (b), and (c) remain in uncrossedlinked form. The invention further relates to the use of the heat-curing reaction mixtures for the preparation of high-quality polyurethane polyurea plastics.
摘要:
Polyamines containing primary amino groups are made by a one-shot process for the hydrolysis of prepolymers containing isocyanate end groups and having an isocyanate content of from 0.5 to 40 weight % with 0.75 to 40 mol of water per equivalent of isocyanate groups in the presence of very small quantities of sodium hydroxide in certain organic, polar solvents. The compounds containing isocyanate groups used for this process are isocyanate prepolymers (preferably containing urethane groups). Hydrolysis according to this process leads directly to the polyamines with elimination of carbon dioxide. These polyamines may be isolated by the usual methods and the removal of the small quantities of catalyst may advantageously be omitted. These polyamines are useful for the preparation of polyurethane(urea)s.
摘要:
Polyamines are produced by hydrolyzing an isocyanate compound in the presence of at least one of a selected group of catalysts and a water miscible polar organic solvent in substantially homogeneous phase at 40.degree.-170.degree. C. The catalyst employed is selected from potassium hydroxide, rubidium hydroxide, cesium hydroxide, potassium alcoholates, rubidium alcoholates, cesium alcoholates, potassium carboxylates, rubidium carboxylates and cesium carboxylates. These polyamines are useful in the production of polyurethane(urea)s.
摘要:
This invention relates to a process for the production of solid polyamines stabilized by a polyadduct covering and showing retarded reactivity comprising reacting(1) one or more solid organic polyamines in particulate form, said polyamines containing at least two primary and/or secondary amino groups and having melting points above 50.degree. C., and(2) from 0.1 to 25 equivalent % of isocyanate per amine equivalent of a water insoluble, difunctional and/or higher functional polyisocyanate,said reaction being conducted at a temperature below the melting point of said solid polyamine, and being conducted in the presence of(3) a liquid medium selected from the group consisting of(a) organic compounds containing two or more hydroxy groups and having molecular weights of from 62 to 10,000,(b) plasticizers,(c) water, and(d) mixtures thereofto form a suspension of polyadduct-covered stabilized polyamines in the liquid medium.