Abstract: A process for producing N-(1-alkoxyethyl)carboxylic amides by reacting alcohols of 1-5 carbon atoms with N-vinylcarboxylic amides in the presence of an acidic catalyst, or by utilizing unreacted starting material, unreacted intermediate or unrecovered product for synthesis of N-(1-alkoxyethyl)carboxylic amides. A process for producing N-(1-alkoxyethyl)carboxylic amides by adding a water-soluble strong acid during reaction between a carboxylic amide and a starting material containing acetaldehyde and alcohol and/or a starting material containing an acetal, in an amount of 2.times.10.sup.-3 to 3.times.10.sup.-1 equivalents to 1 mole of the carboxylic amide in the starting material, and using a strongly acidic ion-exchange resin as the catalyst.

Abstract: A highly polymerizable N-vinylcarboxylic acid amide having an N-1,3-butadienylcarboxylic acid amide content of 30 ppm or less, a process for producing the same, and a process for producing a homopolymer of N-vinylcarboxylic acid amide or a copolymer thereof with another copolymerizable monomer using the same. Also, a highly polymerizable N-vinyl carboxylic acid amide is produced by thermal cracking or catalytic cracking of N-(1-alkoxyethyl)carboxylic acid amide or ethylidenebiscarboxylic acid amide, wherein the N-vinylcarboxylic acid amide content of the N-(1-alkoxyethyl)carboxylic acid amide or ethylenebiscarboxylic acid amide is 10 wt % or less.

Abstract: The subject invention relates to an ointment comprising a homogeneous mixture of polymer or copolymer of N-vinylacetamide, as an essential component, water and/or alcohols, and a pharmacologically active component. The ointment may be coated or plastered onto the skin or mucosa of a human being or animal in order to effect a therapeutic response.

Abstract: A process for producing acetaldehyde dimethylacetal comprising reacting acetaldehyde and methanol in the presence of an acid catalyst is disclosed, in which the reaction is carried out in a part of a rectification tower while conducting rectification to withdraw the water by-produced from the bottom of the tower and to recover a distillate containing the acetaldehyde dimethylacetal produced from the top of the tower. The distillate is subjected to azeotropic distillation in the presence of n-hexane or cyclohexane to separate methanol as an azeotrope with n-hexane or cyclohexane and a small amount of the acetaldehyde dimethylacetal and to recover high purity acetaldehyde dimethylacetal as a bottom.

Abstract: A (co)polymer suitable for bases or auxiliary agents for external application (for example, hydrophilic gels, adhesives, thickeners or excipients) to be coated or plastered onto the skin or mucosa of a human being or animal, such as ointment agents (ointment, hydrogel, jelly or cream), plastering agents (molded poultice, tape agent or plaster agent), sticky bandages (sticky bandage, strap, wound strap, surgical tape, taping material, supporter), and to preparations for external application containing same.

Abstract: A (co)polymer suitable for bases or auxiliary agents for external application (for example, hydrophilic gels, adhesives, thickeners or excipients) to be coated or plastered onto the skin or mucosa of a human being or animal, such as ointment agents (ointment, hydrogel, jelly or cream), plastering agents (molded poultice, tape agent or plaster agent), sticky bandages (sticky bandage, strap, wound strap, surgical tape, taping material, supporter), and to preparations for external application containing same.

Abstract: A process for the preparation of an N-(.alpha.-alkoxyethyl)carboxylic acid amide represented by the following formula [I]: ##STR1## wherein R stands for a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a benzyl group or an aryl group, and R.sup.1 stands for an alkyl group having 1 to 10 carbon atoms or a cycloalkyl group,which comprises reacting an ethylidene-bisamide represented by the following formula [II]:CH.sub.3 CH(NHCOR).sub.2 [II]wherein R stands for a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a benzyl group or an aryl group,with an alkanol in the presence of an acid catalyst. According to this process, a high-purity N-(.alpha.-alkoxyethyl)carboxylic acid amide, which is valuable as an intermediate for the production of an N-vinylcarboxylic acid amide and the like, can be easily prepared from cheap and easily available starting materials.