摘要:
Polyurethanes having improved tear resistance which are the reaction product of the following components: A) a polyol component containing dimer diol and/or trimer triol and/or an OH-terminated polyester produced from polycarboxylic acids, preferably dimer fatty acid and/or trimer fatty acid, and diols and B) an isocyanate component containing prepolymers obtained by reacting polyfunctional isocyanates with dimer diol and/or trimer triol and/or an OH-terminated polyester produced from polycarboxylic acids, preferably dimer fatty acid and/or trimer fatty acid, and diols; and processes for their manufacture.
摘要:
Aqueous polyurethane dispersions prepared in several stages by reactingA) aliphatic and/or aromatic di- and/or tri-isocyanates withB1) polyol mixtures containing dimer diols of 25 to 100% by weight of dimer diols and 0 to 75% by weight of other hydrophobic diols and/or polyols, the equivalent ratio of OH to NCO being 1:1.1 to 1:4, and simultaneously or subsequently withB2) chain-extending agents containing two terminal NCO-reactive groups, the chain-extending agents additionally containing either artionic or cationic groups or groups convertible into anionic or cationic groups by neutralization, the equivalent ratio of NCO-reactive groups to NCO groups theoretically still present after the reaction of A) with B1) being 1:0.9 to 1:4, and then optionally reactingC) the NCO groups theoretically still present in the polyurethanes after the reaction of A) with B1) and B2) with polyols containing at least three hydroxyl groups and/or amino alcohols containing at least two hydroxyl groups in an equivalent ratio of OH+amino groups to NCO of at least 3:1, and finally dispersing the polyurethanes obtained in water, the polyurethanes obtained being at least partly neutralized before or during dispersion where the chain extending agents B2) contain as additional groups those groups which are only converted into anionic or cationic groups by neutralization, are provided. Also provided is a process for the production of aqueous polyurethane dispersions and methods of using aqueous polyurethane dispersions so prepared as stoving lacquers.
摘要:
A method for preparing a polyol useful in the formation of an isocyanate casting resin or coating composition is presented involving the reaction of an essentially C18 fatty acid mixture with a monofunctional alcohol to form a fatty acid ester mixture, forming a epoxidized fatty acid ester mixture from the fatty acid ester mixture, and reacting the epoxidized mixture with an aliphatic alcohol to form a polyol. The polyol can be further reacted with an isocyanate to form a casting resin or coating composition. The fatty acid mixture contains at least 80 percent oleic acid. Polyols prepared by this method provide good color quality and improved color stability during storage when used in the production of isocyanate casting resins and coating compositions.
摘要:
Fatty acid esters of which the fatty acid constituents are fatty acids containing a total of 12 to 22 carbon atoms and of which the alcohol constituents are saturated and/or mono- or polyolefinically unsaturated monoalcohols containing a total of 1 to 22 carbon atoms, with the additional proviso that the fatty acid constituents of the esters contain saturated and/or mono- or polyolefinically unsaturated fatty acids and have a branched structure, isostearic acid being excluded as the fatty acid constituent of the esters, are suitable as solvents for printing inks.
摘要:
A process for making OH-terminated compounds involving: (a) combining at least one CH2OH-terminated diol and a titanium-containing catalyst to form a reaction mixture; (b) heating the reaction mixture to a temperature of from 110 to 160° C. to form a heated reaction mixture; (c) continuously adding dimethyl carbonate to the heated reaction mixture; (d) continuously distilling all methanol released from the heated reaction mixture; (e) heating the reaction mixture to a temperature of from 190 to 240° C. to form an OH-terminated product; (f) removing unreleased methanol and dimethyl carbonate from the reaction mixture under a pressure of less than 100 mbar; and (g) deactivating the titanium-containing catalyst by adding from 0.8 to 2 equivalents, based on the catalyst, of a 1 to 20% by weight aqueous solution of phosphoric acid to the reaction mixture, at a temperature of from 80 to 120° C.
摘要:
Fatty (meth)acrylates having a %-EpO content of below 0.6, which are reaction products of epoxidized compounds selected from the group consisting of epoxidized fatty acid esters, epoxidized triglycerides and mixtures thereof, and acids selected from the group consisting of acrylic acid, methacrylic acid and mixtures thereof, wherein the %-EpO content of the epoxidized compound is above 6.4, wherein the epoxidized compound is an epoxidation product of fatty acid moieties having one or more carbon-carbon double bonds, wherein less than 20 mole % of the fatty acid moieties contain three or more carbon-carbon double bonds, and wherein greater than 60 mole % of the fatty acid moieties contain two carbon-carbon double bonds are useful as pigment dispersants. Pigment dispersant concentrates, aqueous pigment dispersions and methods of dispersing pigments with the fatty (meth)acrylates are described.
摘要:
Fatty acid esters of which the fatty acid constituents are saturated and/or mono- or polyolefinically unsaturated fatty acids containing a total of 12 to 22 carbon atoms and of which the alcohol constituents are saturated and/or mono- or polyolefinically unsaturated monoalcohols containing a total of 1 to 22 carbon atoms, with the additional proviso that the fatty acid constituents of the esters contain an alicyclic group which may optionally be substituted by an aliphatic group, are suitable as solvents for printing inks.
摘要:
Fatty acid esters of which the fatty acid constituents are fatty acids containing a total of 12 to 22 carbon atoms and of which the alcohol constituents are saturated and/or mono- or polyolefinically unsaturated monoalcohols containing a total of 1 to 22 carbon atoms, with the additional proviso that the fatty acid constituents of the esters contain saturated and/or mono- or polyolefinically unsaturated fatty acids and have a branched structure, isostearic acid being excluded as the fatty acid constituent of the esters, are suitable as solvents for printing inks.
摘要:
Fatty acid esters of which the fatty acid constituents are saturated and/or mono- or polyolefinically unsaturated fatty acids containing a total of 12 to 22 carbon atoms and of which the alcohol constituents are saturated and/or mono- or polyolefinically unsaturated monoalcohols containing a total of 1 to 22 carbon atoms, with the additional proviso that the fatty acid constituents of the esters contain an aryl group which may optionally be substituted by an aliphatic group, are suitable as solvents for printing inks.