摘要:
The present invention relates to water soluble or water dispersible polyurethane elastomers which have a substantially linear molecular structure and which contain both ethylene oxide units incorporated in polyether chains and sulphonate groups, characterized in that they contain from about 0.5 to 20% by weight of ethylene oxide units of the formula --CH.sub.2 --CH.sub.2 --O-- arranged within polyether chains and from about 0.1 to 25 milliequivalents, per 100 g of solid, of sulphonate groups of the formula --SO.sub.3.sup..crclbar. in the form of structural units of the formula--O--X--Rarranged in end positions and/or side positions, whereinX represents a polyalkylene oxide chain having from 5 to 90 chain members, at least about 40% of which chain members constitute ethylene oxide units andR represents a monovalent hydrocarbon group having from 3 to 18 carbon atoms containing at least one sulphonate group --SO.sub.3.sup..crclbar. andto a process for their production.
摘要:
The present invention provides a reinforced glass laminate, comprising a non-hydrophilic synthetic resin, at least one surface of which has been rendered hydrophilic by bonding thereon a layer of a hydrophilic material, a layer of hydrophilic synthetic resin being bonded to said layer of hydrophilic material and a layer of glass being bonded to said layer of hydrophilic synthetic resin.The present invention also provides a process for producing a reinforced glass laminate, wherein a non-hydrophilic synthetic resin is coated with a solution capable of forming a layer of a hydrophilic material thereon, the solvent medium is then removed, a hydrophilic synthetic resin is placed on the layer of hydrophilic material and glass is then placed on the hydrophilic synthetic resin, whereafter bonding together of the layers is achieved either by applying an increased pressure at an elevated temperature or by heating under reduced pressure.
摘要:
A cationic electrodeposition-coating resin is prepared by reacting(1) a polyisocyanate with(2) a polyol and(3) a monofunctional blocking agent at a molar ratio of excess of isocyanate groups to total of hydroxyl groups of the polyol and functional groups of the monofunctional blocking agent to obtain an intermediate (A) having isocyanate groups; and reacting a tertiary amine having at least two hydroxyl groups with the intermediate (A) at a molar ratio of excess of hydroxyl groups of the tertiary amine to isocyanate groups of the intermediate (A); and cationizing the resulting reaction product (B).
摘要:
Continuous process for producing hydrogels by charging preselected feeds containing poly(oxyalkylene) polyols, organic diisocyanate and catalyst to a reaction zone followed by crosslinking by exposure to atmospheric humidity. Solvents are not used and the hydrogels are shaped in desired configuration as they exit the extruder.
摘要:
Water-soluble polyurethanes are obtained by reacting sulfonated anionic polyesters containing about 0.8 to 2% sulfur with at least one diisocyanate to form film-forming polyurethanes which are directly soluble in water. The polyurethanes of the invention are advantageously applied in aqueous solution form as sizing for textiles and for bonding leathers.
摘要:
Method for the production of water swellable, lightly crosslinked, hydrogel polymer tapes or fibers comprises extruding an isocyanato terminated prepolymer of a poly(alkyleneoxy) polyol and an organic diisocyanate into a coagulant or crosslinking bath containing water or organic polyamine as the crosslinker.
摘要:
Microporous polyurethane hydrogels of high water swellability comprising lightly crosslinked polymers of isocyanate terminated prepolymers which are the reaction product of (i) poly(alkyleneoxy) polyol with (ii) organic diisocyanate that has been lightly crosslinked with (iii) water or an organic polyamine are produced by impregnating the isocyanato terminated prepolymer solution prior to contact with the crosslinking agent with a minor significant amount of a liquid non-solvent.