Abstract:
The present invention relates to a process for the "in situ" preparation of stable dispersions of polyisocyanate polyaddition products in hydroxyl containing compounds as dispersing agents which comprises reacting1. organic polyisocyanates with2. compounds having primary and/or secondary amino groups and/or primary hydroxyl groups in3. compounds having at least one hydroxyl group, compounds 3 having secondary hydroxyl groups if compounds 2 have primary hydroxyl groups and at least one of the components 1 or 2 having ionic groups and/or groups capable of salt formation, in the presence of from 2 to 50% by weight of water, based on the total quantity of reaction mixture, the improvement which comprises carrying out the polyisocyanate polyaddition reaction in the presence of a polymer latex or the solution of an ionic polyurethane. The invention also relates to the use of the stable dispersions made by the above process in making polyurethane resins.
Abstract:
This invention relates to a process for the preparation of finely divided, stable and relatively low viscosity dispersions of ionic polyisocyanate polyaddition products in compounds having hydroxyl groups by reacting(1) organic polyisocyanate with(2) compounds having primary and/or secondary amino groups and/or primary hydroxyl groups in(3) compounds having at least one hydroxyl group,with the proviso that compounds (3) have secondary hydroxyl groups if compounds with primary hydroxyl groups are used as compound (2), and further characterized in that at least one of the components (1) or (2) has groups which are ionic and/or capable of salt formation.
Abstract:
The instant invention is directed to a process for the separation of aqueous sludges in the purification of effluents in purification plants, comprising:(a) mixing organic and/or inorganic aqueous sludges with ground monomer-free tolylene diisocyanate (TDI) distillation residues having a mean particle size of less than 2 mm;(b) removing the water from the resulting purified sludges; and(c) disposing of the purified sludges.
Abstract:
This invention relates to a process for the production of new, non-foamed urethane and/or urea group-containing polyisocyanate polyaddition products which contain both cationic and also anionic groups chemically bound into the same molecule of said polyisocyanate polyaddition products, to the polyaddition products obtainable by this process and to the use thereof for coating flexible and non-flexible sheet-form materials.
Abstract:
This invention relates to polyurethane(urea) compositions which contain foam and which are preferably cationically modified, contain non-abrasively bonded fillers and have a very high water absorbability (WAF).Production is effected by reacting isocyanate-terminated prepolymers with a quantity of water far exceeding the stoichiometric quantity in the presence of foams in particle or film form. The reaction mixture may also contain lignite powder and/or peat, other inorganic and organic fillers and/or biomasses (living cells, living bacteria, enzymes).The polyurethane(urea) compositions contain up to 95% by weight of foam particles and may contain further fillers (preferably lignite and/or peat). The compositions are swollen and have a high water content during production. Their water absorbability (WAF) when suspended in water is 33 to 97% by weight of water. They can be used as carriers in microbic synthesis processes for the production of complicated organic compounds (when they have incorporated biomasses) as special carriers for the growth of plants, as filter agents or as adsorbents for non water-soluble liquids [for example, crude oil or petrol].
Abstract:
This invention relates to polyurethane(urea) compositions which contain foam and which are preferably cationically modified, contain non-abrasively bonded fillers and have a very high water absorbability (WAF).Production is effected by reacting isocyanate-terminated prepolymers with a quantity of water far exceeding the stoichiometric quantity in the presence of foams in particle or film form. The reaction mixture may also contain lignite powder and/or peat, other inorganic and organic fillers and/or biomasses (living cells, living bacteria, enzymes).The polyurethane(urea) compositions contain up to 95% by weight of foam particles and may contain further fillers (preferably lignite and/or peat). The compositions are swollen and have a high water content during production. Their water absorbability (WAF) when suspended in water is 33 to 97% by weight of water. They can be used as carriers in microbic synthesis processes for the production of complicated organic compounds (when they have incorporated biomasses) as special carriers for the growth of plants, as filter agents or as adsorbents for non water-soluble liquids [for example, crude oil or petrol].
Abstract:
The present invention relates to the use of thermosetting polyurethane urea reactive adhesive compositions which are stable at ambient temperature but rapidly set at higher temperatures, wherein the adhesive comprises stabilized finely-divided polyisocyanates of retarded reactivity of which 0.1 to 25% of the NCO-groups are surface-modified and higher and/or lower molecular polyamines (optionally with polyols as additional reactive components). An important feature of these thermosetting reactive adhesive compositions is their capacity for storage at ambient temperature and their spontaneous increase in viscosity at relatively low heating temperatures which prevents the adhesive from running off during the heating period when applied to vertical surfaces.
Abstract:
This invention relates to solutions of polyisocyanate polyaddition products with a solids content of from 5 to 70% by weight ofA. Reaction products of(a) polyisocyanates,(b) hydrazines and/or polyamines and/or dihydrazides and/or ammonia and/or urea and/or low molecular weight polyols,(c) optionally higher molecular weight polyols and(d) optionally formaldehyde inB. polyhydric alcohols having a molecular weight of between 62 and 450.
Abstract:
The present invention relates to a process for the in situ preparation of stable dispersions of polyisocyanate polyaddition products in hydroxyl-containing compounds as dispersing agents, by a process which comprises reacting1. organic polyisocyanates with2. compounds having primary and/or secondary amino groups and/or primary hydroxyl groups and/or ammonia in3. compounds having at least one hydroxyl group,compounds 3 having secondary hydroxyl groups if compounds 2 have primary hydroxyl groups and wherein the starting components are reacted together in the presence of more than 4% by weight of water, based on the reaction mixture including water, the process being characterized in that the polyisocyanate polyaddition reaction is carried out in the presence of a polymer latex or in the solution of an ionic, linear polyurethane. If desired, the water is subsequently removed in known manner. The invention also relates to the use of the dispersions made by this process in preparing polyurethane resins.
Abstract:
This invention relates to a process for working up the distillation residue obtained in the commercial production of tolylene diisocyanate by grinding, optionally accompanied and/or followed by chemical modification reactions. The finely divided powder obtained may be used as a reactive filler in the production of a variety of plastics.