Didier Wilhelm

Bio: Didier Wilhelm is an academic researcher. The author has contributed to research in topics: Substituent. The author has an hindex of 2, co-authored 3 publications receiving 31 citations.

Alkanepolycarboxylic acid derivatives as cross-linking agents of cellulose, new derivatives and textile finishes

Abstract: Use as cellulose cross-linking agents of derivatives of alkanepolycarboxylic acids corresponding to general formula I: ##STR1## in which: n, m=0 or 1, R 1 , R 3 , R 5 and R 7 =H or COOH it being understood that at least two of the substituents from the said substituents R 1 , R 3 , R 5 and R 7 represent a carboxyl group, R 2 , R 4 , R 6 , R 8 =H or PO(OH)(OR) where R=H or Alk C 1 -C 4 , it being understood that only one substituent from the said substituents R 2 , R 4 , R 6 and R 8 represents said PO(OH)(OR) group, textile finishes containing said products of formula I and new derivatives of formula I.

Novel derivatives of phosphonalcane polycarboxylic acids and use thereof

Abstract: Use, as an agent for crosslinking cellulose, of derivatives of alkanepolycarboxylic acids corresponding to the general formula I: in which: - n, m = 0 or 1, - R1, R3, R5 and R7 = H or COOH it being understood that at least two substituents among the said substituents R1, R3, R5 and R7 denote a carboxy group, - R2, R4, R6 and R8 = H or PO(OH)(OR) where R = H or C1-C4 Alk, it being understood that only a single substituent among the said substituents R2, R4, R6 and R8 denotes the said group PO(OH)OR, textile finishes containing the said products of formula I, new derivatives of formula I and process for their preparation.

Applications de derives d'acides alkanopolycarboxyliques comme agents de reticulation de la cellulose, nouveaux derives et apprets textiles

Abstract: Utilisation a titre d'agent de reticulation de la cellulose des derives des acides alkanepolycarboxyliques repondant a la formule generale I (voir formule I) dans laquelle - n, m = 0 ou 1 - R1, R3, R5, R7 = H ou COOH etant entendu qu'au moins deux substituants parmi lesdits substituants R1, R3, R5, R7 representent un groupement carboxyle, - R2, R4, R6, R8 = H ou PO(OH)(OR) ou R = H ou Alk C1-C4, etant entendu qu'un seul substituant parmi lesdits substituants R2, R4, R6, R7 represente ledit groupement PO(OH)OR, apprets textiles renfermant lesdits produits de formule I, de nouveaux derives de formule I et leur procede de preparation.

Curable aqueous composition and use as fiberglass nonwoven binder

Abstract: This invention relates to a formaldehyde-free curable aqueous composition containing a polyacid, a polyol and a phosphorous-containing accelerator. The composition may be used as a binder for heat resistant nonwovens such as nonwovens composed of fiberglass.

A formaldehyde-free accelerated cure aqueous composition for bonding glass fiber-heat resistant nonwovens

Abstract: A formaldehyde-free curable aqueous composition comprising: (a) a polyacid comprising at least two carboxylic acid groups, anhydride groups, or salts of the polyacid thereof; (b) an active hydrogen compound containing at least two active hydrogen groups selected from the group consisting of hydroxyl, primary amino, secondary amino, and mixtures thereof; and (c) a fluoroborate accelerator; wherein the ratio of the number of equivalents of said carboxylic acid groups, anhydride groups, or salts thereof to the number of equivalents of said hydroxyl groups is from 1/0.01 to about 1/3, and wherein said carboxylic acid groups, anhydride groups, or salts thereof are neutralized to an extent of less than 35% with a fixed base is disclosed. A method for curing formaldehyde-free polyacids and a method for bonding glass fiber heat-resistant nonwovens with a formaldehyde-free binder are further disclosed.

Modified textile and other materials and methods for their preparation

Abstract: Provided are compounds and methods for modifying a material to change properties of the material, as well as a variety of products obtained using the methods. In one embodiment, a material comprising one or more modifiable functional groups is reacted with an activated hydrophobic acyl group in the presence of a hindered base, thereby to covalently attach the hydrophobic acyl group to the modifiable functional groups on the material. The material which is modified may be, for example, a carbohydrate, and the modifiable functional groups on the material may be hydroxyls. For example, materials such as cellulose may be modified by reacting it with an acid chloride or acid anhydride including a hydrophobic acyl group, in the presence of a hindered base, such as tripentylamine, to attach the hydrophobic acyl groups to the hydroxyls on the cellulose, thereby to increase the hydrophobicity of the cellulose. The methods and compounds disclosed herein may be used to modify materials to improve properties such as resistance, grease repellency, soil resistance and permanent press properties.

Method for strengthening cellulosic substrates

Abstract: This invention relates to a method for strengthening a cellulosic substrate by treating the substrate with a formaldehyde-free curable aqueous composition and curing the composition. The cellulosic substrates include, for example, paper oil- and air-filter stock, rayon nonwoven wipes, cellulosic laminating stock, cotton woven fabrics, and wood flakes suitable to be consolidated into flakeboard.

Non-aqueous electrolyte solution and electricity-storage device using same

Abstract: The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics at high temperatures and further capable of not only improving a capacity retention rate after a high-temperature cycle test but also decreasing a rate of increase of an electrode thickness, and also to provide an energy storage device using the same. A nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing from 0.001 to 5% by mass of a diisocyanate compound represented by OCN-L-NCO (in the formula, L represents an alkylene group having from 4 to 12 carbon atoms) and further containing from 0.001 to 5% by mass of at least one selected from a specified phosphoric acid ester compound, a specified cyclic sulfonic acid ester compound, a specified isocyanate compound having an ester structure, and a specified triple bond-containing compound, and an energy storage device using the same, are disclosed.