A method of attaching dialdehyde starch to surfaces is disclosed. A substrate to which substances may be coupled, which substrate comprises at least one surface coated with dialdehyde starch, and products produced utilizing the substrate are also provided.

Oligomeric condensation products of certain dialdehydes and phenols can be end-capped with a vinylbenzyl moiety and certain other moieties, especially alkyl groups, to afford thermosetting resins particularly valuable in making laminated circuit boards. Resins prepared by the reaction of 1 molar proportion of glyoxal with from 3 to 4 molar proportions of phenol and end-capped with from 50 to 85% vinylbenzyl groups with the remainder being alkyls of 1 through 11 carbon atoms are particularly usef...

An odorless sterilizing and disinfecting solution is described which has a pH of from 3 to 9 and which contains an effective amount of phthalaldehyde. The solution is used to sterilize or to disinfect a surface in need of such treatment.

A method for promoting color change in human hair by impregnating the hair with a solution containing at least one dialdehyde compound in combination with at least one nitrogen containing compound and allowing the solution to remain in contact with the hair for an effective period of time to permit the desired color to develop. The use of dialdehyde promoting compounds have been found to generate the desired color in a much shorter period of time than heretofore known, and yield good development...

Mineral tanned leather is stabilized against degradation due to warm or hot alkaline washings by applying thereto during tanning or retanning an aqueous solution of from about 5 parts to about 1 part dialdehyde starch and from about 1 part to about 5 parts of a benzene polycarboxylic acid or alkali metal salt thereof based on the weight of the leather. A 5 percent solution based on the weight of the hide of a 1:1 composition of dialdehyde starch and sodium isophthalate is preferred.

Disclosed is the novel compound 4,4'-diphenylether-dialdehyde-bis-dimethylacetyl of the formula ##STR1## and a process for its preparation from di-p-tolyl ether ##STR2## by anodic oxidation of the latter in the presence of methanol and of a supporting electrolyte. The anode material used in this reaction is preferably platinum, lead dioxide, graphite or vitreous carbon, and the cathode material used is preferably steel, nickel, or graphite. The supporting electrolyte used is preferably NaOCH.sub...

Microbial growth is inhibited in a medium susceptible to such growth by treatment with an effective amount of an insoluble dialdehyde polysaccharide which is sufficient to maintain an insoluble aldehyde content in the medium of at least about 0.1 weight percent. The insoluble dialdehyde polysaccharide does not exert a systematic effect on the medium. Suitable dialdehyde polysaccharides for this purpose are insoluble dialdehyde starch, dialdehyde cellulose, and the like.

A new process is presented for preparing cationic dialdehyde starch product and converting same into a storable concentrated liquid form for shipping. The fluid product is ready for application in the manufacture of paper having high dry- and wet-strength properties without additional dispersing or cooking.

Polymeric condensation products obtained by condensing specified amines and aldehydes have high activity to fix, i.e, insolubilize, proteins, including enzymes.

Aminated .gamma.-dialdehyde and the quaternary ammonium salts thereof are prepared by acid hydrolysis of their respective corresponding 2,5-dialkoxy 3-amino 4-hydroxy tetrahydrofurans or by acid hydrolysis of their respective corresponding tetraalkyl acetals. The aminated .gamma.-dialdehydes and the quaternary ammonium salts thereof are usefully employed in cosmetic compositions to tan the skin or to strengthen or restructure the hair.