摘要:
Provided is a convenient method for the synthesis of quaternary ammonium sulfonate compounds which are useful as curing catalysts for one-part thermosetting resin compositions which maintain storage stability at room temperature. The compounds are synthesized by subjecting in one step a benzyl alcohol optionally having on the benzene ring and/or the .alpha.-position one or more substituent groups to reaction with a corresponding tertiary amine and an organic sulfonic acid chloride.
摘要:
Benzyl pyridinium or ammonium salts of a non-nucleophilic anion are useful as a cationic polymerization initiator having a heat latency. A variety of resinous compositions containing this initiator is also disclosed.
摘要:
Benzylpyridinium or benzylammonium salts of a benzenesulfonate anion are useful as a proton-donating curing catalyst ion a resinous system capable of curing in the presence of such a catalyst. The catalyst is characterized by its heat-latent nature and thus does not impair the storage stability of the resinous system at an ambient temperature.
摘要:
A polymer of an epoxy compound is selectively obtained by polymerizing an epoxy compound having the formula (I): ##STR1## wherein R is a substituted or unsubstituted alkyl group, by using an initiator comprising a silyl ether represented by the general formul (II): ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 are each a substituted or unsubstituted alkyl or aryl group, in the presence of an inorganic fluoride catalyst, thereby preparing a polyether having a silyloxy group in its terminal.
摘要:
New 5-fluorouridine compounds of the general formula: ##STR1## wherein n is an integer of 1 to 3, R' stands for a straight or branched chain alkyl group having 1 to 4 carbon atoms or a benzyl group, and R stands for an amino acid residue selected from the group consisting of alanyl, phenylalanyl, valyl, tyrosyl, 3,4-dihydroxyphenylalanyl and lysyl groups. These compounds possess excellent anti-malignant tumor, anti-viral and immunosuppressive activities.
摘要:
Disclosed are an optically active, ethylenically unsaturated monomer represented by the following structural formula: ##STR1## wherein: A stands for S, SO or SO.sub.2 ; X and Y each stand for a hydrogen atom or a substituent selected from the group consisting of alkyl groups and acyl groups; Z stands for a substituent selected from the group consisting of alkoxy, alkylamino, hydroxyl and silyloxy groups; and X and Y can be bonded together to form a ring with the nitrogen atom to which they are bonded or X and Y can be a single group bonded to said nitrogen atom through a double bond, with the proviso that at least one of X and Z is an alkenyl equivalent to said group, and polymers of this monomer. One typical instance of the monomer is benzyl 6-acrylaminopenicillanate.
摘要:
A method for producing spiro-orthocarbonate compounds is disclosed. The method comprises reacting a cyclic carbonate compound of the following formula with an epoxy compound containing an epoxy group: ##STR1## wherein R is an alkylene group or a substituted alkylene group. The disclosed method makes it easy to commercially produce spiro-orthocarbonate compounds in a one stage reaction. The starting materials can be easily handled without any hygienic difficulties and the method can be carried out without entailing any operational difficulties.
摘要:
A process for fabrication of resist comprising a substrate and an overlying radiation sensitive layer, said overlying layer consisting essentially of a specific polymer or copolymer of vinylnaphthalene.
摘要:
A method for manufacturing a glass substrate for a magnetic recording medium, including a polishing step of polishing a principal surface (12) of a glass substrate (10) having a chamfered surface (16) formed on an end surface of the glass substrate (10), with use of a polishing pad (24) having a concave groove (31) formed in a surface (24a) for supplying a polishing solution, the polishing step is performed in the following condition: 10°≦θp
摘要:
A latent curing agent obtained by the reaction of a coumarin compound of the general formula (1), where X and Y can be independently H, an alkyl group, a heteroalkyl group, an aromatic group, a heteroaromatic group or an acetyl group and Z can be H, OH, an alkyl group, a heteroalkyl group, an aromatic group, a heteroaromatic group with an amine of the general formula (2), where “a” is 1 or 2, A can be an alkylene group, a heteroalkylene group, an aromatic group, a heteroaromatic group, and B can be an alkyl group (if a=1), an alkylene group (if a=2), a heteroalkyl group (if a=1), a heteroalkylene group (if a=2), an aromatic group, a heteroaromatic group, a hydroxyl group (if a=1), a secondary amino group (if a=2), O or S (if a=2), whereby B has the valency “a”, or where B alone or where A and B together form a ring system selected from an aliphatic ring system, a heteroaliphatic ring system, or an aromatic ring system, can be used for curable compositions with a polyepoxide which has at least 2 1,2-epoxide groups per molecule.