摘要:
A method for making polysaccharide dialdehydes is disclosed, which uses a combination of precipitation and separation steps to purify the polysaccharide dialdehyde formed by oxidation of a polysaccharide with periodate. The method is simple, rapid, and provides a polysaccharide dialdehyde having very low levels of iodine-containing species and a low ash content. The polysaccharide dialdehyde is particularly suitable for preparing hydrogel adhesives for medical applications.
摘要:
The invention pertains to a printing form and a process for preparing the printing form from a curable composition that includes an epoxy novolac resin having an epoxide equivalent weight of 156 to 300 g/equivalent, and an amine curing agent selected from primary amines and secondary amines, the agent having an amine equivalent weight of less than or equal to 60 g/equivalent. The process includes applying the curable composition to a supporting substrate to form a layer, curing the layer at one or more temperatures in a temperature range, and engraving to form at least one cell in the cured layer. The process prepares printing forms, particularly gravure printing forms, having a cured resin composition layer that is engravable, resistant to solvent inks and to mechanical wear, and capable of printing gravure-quality images.
摘要:
Described in this invention is a catalytic process for making amide acetals from nitrites and diethanolamines. Amide acetals can be further crosslinked by hydrolyzing the amide acetal groups, and subsequently reacting the hydroxyl groups and/or the amine functions that are formed, to crosslink the composition.
摘要:
The present invention is a process for making a low color copolymer of ethylene glycol, isosorbide and terephthalic acid or dimethyl terephthalate. This copolymer, poly(ethylene-co-isosorbide) terephthalate, is useful for making bottles, hot-fill containers, films, sheet, fiber, strand and optical article applications. It can also be used to make polymer blends and alloys.
摘要:
The invention pertains to a process for preparing a printing form from a curable composition that includes an bisphenol-based epoxy resin; an amine curing agent selected from primary amines and secondary amines, the agent having an amine equivalent weight of less than or equal to 200 g/equivalent; and, a multi-epoxy reactive diluent. The process includes applying the curable composition to a supporting substrate to form a layer, curing the layer at one or more temperatures in a temperature range, and engraving to form at least one cell in the cured layer. The process prepares printing forms, particularly gravure printing forms, having a cured resin composition layer that is engravable, resistant to solvent inks and to mechanical wear, and capable of printing gravure-quality images.
摘要:
A method for purifying liquid alkanes, especially dicyclic alkanes, for use in immersion lithography is provided. The method produces alkanes having absorbance at 193 nm of ≦0.1/cm, and residue of ≦100 ppm. The liquid alkane compositions are useful as immersion liquids in photomicrolithography employed for production of electronic circuits.
摘要:
A process for preparing amide acetals represented in Formula I comprising dehydrating a reactant mixture comprising reactants selected from a group consisting of N-acyl dialkanol amines, O-acyl dialkanol amines and mixtures thereof wherein n and m are independently 2 or 3; p is 1, 2 or 3; R1 and R2 can be the same or different and are each independently hydrogen, a linear or branched alkyl, cycloalkyl or aryl group with 1-20 C atoms; R represents hydrogen, a branched or linear alkyl, cycloalkyl, aryl or an alkenyl group with 1-20 C-atoms, each may have one or more substituents.
摘要翻译:一种制备式I表示的酰胺缩醛的方法,包括使包含选自N-酰基二链烷醇胺,O-酰基二链烷醇胺及其混合物的反应物的反应物混合物脱水,其中n和m独立地为2或3; p为1,2或3; R 1和R 2可以相同或不同,各自独立地为氢,具有1-20个C原子的直链或支链烷基,环烷基或芳基; R表示氢,具有1-20个C原子的支链或直链烷基,环烷基,芳基或烯基,各自可具有一个或多个取代基。
摘要:
Iron, cobalt, chromium or vanadium complexes of 2,6-pyridinedicarboxaldehydes diimines and 2,6-diacylpyridines diimines which are suitable for catalyzing the oligomerization of ethylene to α-olefins exhibit more prolonged catalytic activity if aryl groups attached to the imino carbon atom(s) are substituted with at least one nitro group.
摘要:
A melt polymerization process for the preparation of poly(1,3-propylene-co-isosorbide) terephthalate (3GIT), new 3GITs and products made from the 3GITs. The process comprises (a) providing a mixture comprising terephthalic acid or its alkyl ester, 1,3-propanediol and isosorbide in a molar ratio of diols to terephthalic acid or its alkyl ester of from about 1.1:1 to about 1.6:1 and a molar ratio of 1,3-propanediol to isosorbide of from about 2:1 to about 10:1; (b) reacting the mixture in an inert atmosphere at a temperature of about 180 to about 245° C., with concurrent removal of a distillate comprising at least 80% of the water or alkanol volatile reaction product, wherein the distillate contains less than about 5 weight % 1,3-propanediol and less than 1 weight % isosorbide; and (c) continuing the reaction in the presence of a polycondensation catalyst at a pressure of about 0.25 to about 2 mm Hg and about 245 to about 260° C. to form a 3GIT containing about 4 to about 20 mole % isosorbide units, based on the 3GIT.
摘要:
Disclosed is a process for manufacturing an ester of 1,3-propanediol, comprising, contacting at a temperature of about 0.degree. C. to about 250.degree. C., ethylene, formaldehyde or a form of formaldehyde, a carboxylic acid, and a compound of the formula MZ.sub.n.Q.sub.t, wherein:M is a zirconium[IV], cobalt[II], vanadium[IV], bismuth[II], tin[II], a rare earth metal, scandium or yttrium;n is the oxidation state of M;at least one of Z is an anion of the formula R.sup.1 SO.sub.3.sup.- or R.sup.1 CO.sub.2.sup.-, wherein R.sup.1 is hydrocarbyl or substituted hydrocarbyl containing 1 to 20 carbon atoms or part of a polymer, and the remainder of Z is oxo or one or more monovalent anions;Q is a neutral ligand; andt is 0 or an integer of 1 to 12.
摘要翻译:公开了一种制备1,3-丙二醇酯的方法,包括在约0℃至约250℃的温度下接触乙烯,甲醛或甲醛,羧酸和化合物的形式 其中:M是锆[IV],钴[II],钒[IV],铋[II],锡[II],稀土金属,钪或钇; n是M的氧化态; Z中的至少一个是式R 1 SO 3 - 或R 1 CO 2 - 的阴离子,其中R 1是含有1至20个碳原子或部分聚合物的烃基或取代的烃基,并且其余的Z是氧代或一个或多个一价阴离子; Q是中性配体; t为0或1〜12的整数。