Abstract: The present invention provides an indicator composition for evaluating cleaning of a medical instrument that includes an extracellular matrix component and hemoglobin, as a contamination model having cleaning profile resembling an actual contaminant adhered to a medical instrument such as a surgical instrument.

Abstract: The present invention provides an indicator composition for evaluating cleaning of a medical instrument comprising an extracellular matrix component and hemoglobin, as a contamination model having cleaning profile resembling an actual contaminant adhered to a medical instrument such as a surgical instrument.

Abstract: A composition for rust removal which is highly effective in removing rust. The composition is a water-soluble composition which comprises a basic compound, a water-soluble metal chelating agent, and thiourea dioxide and which, when dissolved in an aqueous medium, gives an alkaline solution.

Abstract: A process for producing a resin is disclosed, comprising reacting (a) a polyalkylenepolyamine, (b) an alicyclic dibasic carboxylic acid and/or a reaction product having a free carboxyl group that is obtained by reacting an alicyclic dibasic carboxylic acid with a glycol, (c) a urea, and (d) an aldehyde and/or an alkylating agent. The resulting resin is useful as a wet strength agent to provide a paper coating composition having improved printability and printing effects.

Abstract: A process for producing a resin is disclosed, comprising reacting (a) a polyalkylenepolyamine, (b) an alicyclic dibasic carboxylic acid and/or a reaction product having a free carboxyl group that is obtained by reacting an alicyclic dibasic carboxylic acid with a glycol, (c) a urea, and (d) an aldehyde and/or an alkylating agent. The resulting resin is useful as a wet strength agent to provide a paper coating composition having improved printability and printing effects.

Abstract: A process for producing a resin is disclosed, comprising reacting (a) a polyalkylenepolyamine, (b) an alicyclic dibasic carboxylic acid and/or a reaction product having a free carboxyl group that is obtained by reacting an alicyclic dibasic carboxylic acid with a glycol, (c) a urea, and (d) an aldehyde and/or an alkylating agent. The resulting resin is useful as a wet strength agent to provide a paper coating composition having improved printability and printing effects.

Abstract: A paper coating composition is disclosed, which comprises:(A) a pigment, and(B) a copolymer emulsion prepared by polymerizing a monomer mixture containing:(i) 5 to 40 wt % of an .alpha.-olefin of the formula:CH.sub.2 .dbd.CH--R.sub.1wherein R.sub.1 is a hydrogen atom or an alkyl group having 1 to 12 carbon atoms;(ii) 30 to 90 wt % of a vinyl ester of the formula: ##STR1## wherein R.sub.2, R.sub.3 and R.sub.4 are each a hydrogen atom or an alkyl group having 1 to 18 carbon atoms;(iii) 1 to 30 wt % of at least one unsaturated carboxylic acid ester selected from the group consisting of an acrylic acid ester in which the alkyl moiety thereof has 1 to 18 carbon atoms and a methyacrylic acid or dibasic unsaturated carboxylic acid ester in which the alkyl moiety thereof has 1 to 18 carbon atoms; and(iv) 0.1 to 10 wt % of an unsaturated carboxylic acid. The paper coating composition of the invention provides improved printability and printing quality and is particularly useful for gravure printing.

Abstract: A paper coating composition is described, containing a pigment and an aqueous binder as major components, and further containing a mixture of a reaction product between (a) at least one alkylenediamine or polyalkylenepolyamine and (b) epihalohydrin, and (Y) a water-soluble resin obtained by reacting urea, polyalkylenepolyamine, and dibasic carboxylic acid and reacting the resulting polyamidopolyurea with formaldehyde, or containing these reaction products.

Abstract: A paper coating composition is described, containing a pigment and an aqueous binder as major components, and further containing a thermosetting resin in aqueous solution, obtained by reacting or mixing (Y) a water-soluble resin obtained by reacting urea, polyalkylenepolyamine, and dibasic carboxylic acid and reacting the resulting polyamidopolyurea with formaldehyde, (a) at least one alkylenediamine or polyalkylenepolyamine, and (b) epihalohydrin, or the reaction product between (Y) and (b) with (a).

Abstract: An amphoteric polyelectrolyte which is useful as a paper additive capable of imparting dry strength to paper, a high molecular flocculant, a high molecular dehydrating agent or the like is prepared by copolymerizing a cationic vinyl monomer such as .beta.-methacryloxyethyl trimethylammonium chloride, an anionic vinyl monomer such as acrylic acid and a vinyl monomer such as acrylamide, optionally with a nonionic vinyl monomer such as acrylonitrile, in a solvent in the presence of a catalyst.

Abstract: A transparentizing composition for paper comprising a compound having the formula: ##STR1## or salts thereof and a solvent.