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Hydroxy-containing hemi-acetals, their preparation and use
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Title:
Hydroxy-containing hemi-acetals, their preparation and use
Subjects:
APPARATUS THEREFOR
;
CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW ORSIMILAR MATERIALS
;
CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING,IMPREGNATING, FINISHING
;
CHEMISTRY
;
COMPOSITIONS BASED THEREON
;
COMPOSITIONS FOR TANNING
;
DERIVATIVES THEREOF
;
FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
;
HETEROCYCLIC COMPOUNDS
;
HIDES
;
IMPREGNATING OR COATING OF PAPER
;
LAUNDERING
;
LEATHER
;
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
;
METALLURGY
;
NAILING OR STAPLING MACHINES IN GENERAL
;
ORGANIC CHEMISTRY
;
ORGANIC MACROMOLECULAR COMPOUNDS
;
PAPER NOT OTHERWISE PROVIDED FOR
;
PAPER-MAKING
;
PELTS
;
PERFORMING OPERATIONS
;
POLYSACCHARIDES
;
PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D
;
PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FORIMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILARMATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITHPERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR
;
PRODUCTION OF CELLULOSE
;
PULP COMPOSITIONS
;
SKINS
;
TEXTILES
;
THEIR PREPARATION OR CHEMICAL WORKING-UP
;
TRANSPORTING
;
TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
;
TREATMENT OF TEXTILES OR THE LIKE
;
TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS,FABRICS, FEATHERS, OR FIBROUS GOODS MADE FROM SUCH MATERIALS
;
WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL
Description:
Hemi-acetals of general formula
in which R is an alkylene radical, preferably containing 1-3 carbon atoms, x and y are integers of 1-5, n is an integer of at least 2 and R1 is a hydrogen or an alkyl group, at least one of the R1 groups being hydrogen, or alternatively two of the -OR1 groups may be removed and the remaining radicals joined together through an oxygen atom to form a cyclic structure or a carbonyl group, may be used to produce resinous materials. They may be reacted with polyhydric alcohols such as pentaerythritol, diand polypentaerythritols and the resulting product reacted with a polyisocyanate such as an arylene diisocyanate. Alternatively the hemiacetals may be reacted with phenols and the products subsequently reacted with epichlorohydrin in the presence of an alkali to form new epoxy resins.ALSO:Hydroxy-containing hemi-acetals are prepared by reacting under acidic conditions: (1) an aldehyde in which there is attached to the a - or b -carbon atom relative to the aldehyde group a hydroxyl, alkyl-sec.-amino-, primary amino or mercapto group, or an aliphatic carbon-carbon unsaturated linkage and (2) a dissimilar aldehyde containing no reactive group other than the aldehyde group. Suitable aldehydes of type (1) are, for example, hydroxy adipaldehyde, hydroxy succinaldehyde, 2-hydroxy propionaldehyde, 3-hydroxy propionaldehyde, 3-aminopropionaldehyde, 2-hydroxy-butyraldehyde, 3-hydroxybutyraldehyde, 3-mercaptopropionaldehyde, 3-mercaptobutyraldehyde, 3 - aminopentanal, 3 - mercaptopentanal, 2-mercaptohexanal, 3-aminodecanal, 3-hydroxycyclohexanal, acrolein, methacrolein, crotonaldehyde, a -phenylacrolein, a -cyclohexyl-acrolein, 2-pentenal, 3-hexenal, 2-decenal, 2-cyclohexenal and 2-hydroxy-3-mercapto-tetradecanal. The preferred aldehyde of type (2) is formaldehyde and formaldehyde precursors such as formalin, paraformaldehyde, trioxane and methalal but other suitable aldehydes are acetaldehyde, butyraldehyde, pentanal, hexanal, octanal, dodecanal, cyclohexanal, 2,4-dimethyl-cyclohexanal, glyoxal, succinaldehyde, 1,8-octanedial, benzaldehyde, adipaldehyde and 3,5-diethylhexanal. The reaction is preferably carried out in the presence of water and/or one or more alcohols. The products of the process are hydroxy-containing hemi-acetals having the general formula
in which R is an alkylene radical, preferably containing 1-3 carbon atoms, x and y are integers of from 1 to 5, n is an integer of at least 2 and R1 is hydrogen or an alkyl group, at least one of the R1 groups being hydrogen alternatively two of the -OR1 groups may be removed and the remaining radicals joined through an oxygen atom to form a cyclic structure or a carbonyl group. In addition there may be obtained small amounts of the following compounds:-
in which R is an alkylene radical, x is 1-5, and n is at least 2. Proceso para preparar uno o más nuevos compuestos para ser empleados en el tratamiento de materiales fibrosos, caracterizado porque un aldehido que tiene ligado al átomo de carbono alfa o beta respecto del grupo ***
Creation Date:
1960
Language:
English;Spanish
Source:
esp@cenet
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