摘要:
The instant invention is directed to a process for the production of denatured polyaddition products of biomasses and isocyanates, comprising reacting(A) from 5 to 98%, by weight, based on (A)+(B), of a biomass based on microorganisms or derivative and decomposition products thereof with(B) from 95 to 2%, by weight, based on (A)+(B), of a compound containing isocyanate groups, at temperatures of at least 50.degree. C. with complete denaturing of component (A).
摘要:
Aminoplastic resin dispersions which are stable to sedimentation are obtained by condensation of aldehydes with aminoplastic resin formers in an aqueous medium, in the presence of water-soluble compounds of the formulaR--X--(A--O).sub.m --B--NHCONH--Y].sub.nhaving the substituent meanings mentioned in the description. The condensation is preferably carried out in the presence of dyestuffs or optical brighteners which have groups capable of condensation. The dispersions obtained thereby are particularly suitable for whitening the coating compositions used in the paper industry, and for coating paper, wood, films and textile materials.
摘要:
A process for preparing a mixture of polyhydroxyl compounds having low molecular weight by catalytically hydrogenating a formose mixture with hydrogen on a metal catalyst. The hydrogenation is carried out at a pH of 7.5 to 12.5 and at elevated temperature and pressure. The formose mixture comprises (i) up to 70 wt. % formose, (ii) up to 1.6 wt. % lead ions and (iii) up to 5 wt. % calcium ions with at least one of (ii) or (iii) being present. The catalyst which is present in an amount of 4-240 wt. % (based on formose solution) is a compound taken from the group consisting of nickel, cobalt and compounds thereof. The mixture of polyhydroxyl compounds made in accordance with the present invention is useful as a starting material in the production of polyether polyols, polyester polyols and polyurethane plastics.
摘要:
A process for the preparation of homogeneous and cellular polyurethane plastics by the reaction of(a) organic polyisocyanates;(b) compounds containing at least 2 Zerewitinoff-active hydrogen atoms and having molecular weights of from 400 to 10,000;(c) chain extenders, and, optionally, additional(d) short-chained compounds containing at least 2 Zerewitinoff-active hydrogen atoms and having a molar mass of from 32 to 400, as well as, optionally,(e) catalysts, blowing agents and other known additives,is described, which is characterized in that 1,4-3,6-dianhydro-hexites, preferably 1,4-3,6-dianhydro-D-sorbitol and/or 1,4-3,6-dianhydro-D-mannitol, optionally mixed with lower molecular weight compounds, preferably with polyols having a molecular weight of from 62 to 400, particularly preferably butane diol-1,4 are used as the chain extenders. The new chain extenders produce high quality elastomers and foams.
摘要:
The subject of the invention is a process for the preparation of polyisocyanates containing isocyanurate groups which comprises trimerizing a proportion of the isocyanate groups of organic polyisocyanates or mixtures of di- and monoisocyanates in the presence of basic alkali metal compounds as catalysts and terminating the trimerization reaction by the addition of a catalyst poison, characterized in that the trimerization catalysts are complexes of(i) basic alkalimetal compounds and(ii) acyclic organic compounds which(a) have at least 6 alkylene oxide units of the formula --R--O--, wherein R represents C.sub.1 -C.sub.4 -alkylene, in the form of one or more polyether chains with only those chains having at least three alkylene oxide units being counted to achieve the total of at least 6 alkylene oxide units(b) contain a total of at least about 40% by weight of alkylene oxide units, the alkylene oxide units of any chains containing less than three of these units not being counted as alkylene oxide units, and(c) have a molecular weight of at least about 282.The invention also relates to the use of the process products according to the invention, optionally freed from excess starting polyisocyanates and/or optionally blocked with blocking agents for isocyanate groups, as an isocyanate component for the production of polyurethanes by the isocyanate polyaddition process.
摘要:
This invention relates to an improved process for the preparation of a mixture of various low molecular weight hydroxyaldehydes, hydroxyketones and polyhydric alcohols by the condensation of formaldehyde with itself. The essential feature of the improvement is that unpurified synthesis gases of the kind obtained from the large scale industrial production of formaldehyde can be used directly as the source of formaldehyde.
摘要:
The present invention relates to stable equilibrium mixtures of carbodiimides, uretone imines and organic isocyanates and to stable solutions of carbodiimides and uretone imines in polyisocyanates which are free from carbodiimide groups. Either the carbodiimide, or the uretone imine, or both, may contain isocyanate groups. The present invention also relates to a process for the preparation of such products by "heterogeneous catalysis" and the use thereof for the production of polyurethane resins. According to one embodiment of the process according to the instant invention, individual isocyanates in a mixture of various isocyanates may be carbodiimidized selectively.
摘要:
A stable dispersion of an aminoplast which is obtained by a process which comprises condensing ammonia hydrazine or an organic compound having a molecular weight of from about 50 to about 400 and which contains at least two groups selected from the group consisting of --NH.sub.2 and --NH-- with benzoquinone or a compound of the formula R--CO--R' in which R and R' stand for the same or different radicals selected from the group consisting of hydrogen C.sub.1 -C.sub.4 alkyl groups which may carry chlorine substituents, C.sub.2 -C.sub.4 -alkenyl groups, C.sub.6 -C.sub.10 aryl groups, C.sub.7 -C.sub.10 aralkyl groups, C.sub.5 -C.sub.10 cycloalkyl group and semi-acetals obtained by reacting said carbonyl compounds with monohydric or dihydric aliphatic alcohols having one to ten carbon atoms in an organic polyhydroxyl compound having a molecular weight of from about 250 to about 14000 as the reaction medium.
摘要:
The present disclosure is concerned with a novel transparent polyurethane polyurea which is particularly suitable for lamination to glass and glasslike transparent plastics. The polymer is the reaction product of high molecular weight diols, optionally low molecular weight diols, dihydroxy carboxylic acids, diisocyanates with only aliphatically and cycloaliphatically bound isocyanates and organic diamines having aliphatically and cycloaliphatically bound primary amino groups. It has specified contents of carboxyl groups and urea groups, and it has a minimum shear modulus at both 20.degree. and 60.degree. C.The present disclosure is also concerned with a process for synthesizing such polymers. A preferred method is to react the diisocyanate and hydroxyl bearing compounds to prepare an isocyanate terminated prepolymer and chain extend with the diamine.Also discussed are the production of film from these polymers by extrusion and solution casting, the production of laminates with glass and glasslike plastics and the laminates so produced. The solution cast or extruded films can be laminated to these substrates by the application of heat and pressure.
摘要:
A process is disclosed for preparing mixtures of low molecular weight polyhydroxyl compounds and hydroxyaldehydes and hydroxyketones by condensing formaldehyde hydrate with itself in the presence of (I) as catalyst a soluble or insoluble compound of a metal of the first to eighth sub-group or second to fourth main group of the Periodic System of Elements, optionally bound to a high molecular weight carrier, and (II) more than 10% by weight, based on formaldehyde, of one or more dihydric or higher hydric low molecular weight alcohols and/or higher molecular weight polyhydroxyl compounds. The pH of the reaction mixture is held at 5.5 to 9.0 until 5-40% conversion has occurred and is then lowered to between 4.5 and 8.0 (0.5-2.0 pH units lower). The reaction is then stopped by inactivating the catalyst.