Abstract: A colored base composition comprising a dispersing amphoteric resin and pigment, said amphoteric resin being prepared by the addition or condensation reaction of an acidic resin bearing both of an electron acceptant group and a functional group and a basic resin and/or basic low molecular weight compound bearing both of an electron donative group and a functional group, the functional group located on one side of the reactants being an active hydrogen and/or active alkoxyl group and the functional group located on the other side of the reactants being a group which is reactive with said active hydrogen and/or active alkoxyl. This base composition is quite stable, compatible with various kinds of resins and pigments and capable of producing a paint composition with excellent film performance.

Abstract: A pigment dispersing resin which essentially consists of a modified polymer obtained by introducing at least one of acidic groups and basic groups into a polymeric polyol of star-shaped structure prepared by reacting a polyol having at least four hydroxyl groups per molecule with an epoxide, the resin being compatible with pigments and vehicle resins, and a pigment dispersed paste which comprises the pigment dispersing resin and a pigment, the pigment dispersed paste being low in viscosity over a long period of time.

Abstract: A pigment-containing base composition comprising at least one organic pigment irradiated with low-temperature plasma and at least one polar resin or solvent, which has good dispersibility.

Abstract: A novel quinolinecarboxylic acid derivative of the formula ##STR1## or a pharmaceutically acceptable salt thereof. These compounds are useful as antibacterial agents, and are prepared by a process which comprises reacting a compound of the formula ##STR2## with a compound of the formula ##STR3##wherein X represents a halogen atom, and thereafter, as required, converting the resulting compound to a pharmaceutically acceptable salt thereof.

Abstract: A 1,1-dioxopenicillanic acid ester represented by formula (I) ##STR1## wherein R represents a methyl or phenyl group. The ester of formula (I) may be prepared by reacting 1,1-dioxopenicillanic acid or its salt with a compound represented by formula (III) ##STR2## wherein R is as defined above, and X represents a halogen atom, or by oxidizing a compound of formula (V) ##STR3## wherein R is as defined above. The ester of the formula (I) is useful as a .beta.-lactamase inhibitor and may be used in association with a .beta.-lactam antibiotic.

Abstract: A process for producing a brominated 1,3-dioxolen-2-one of the following general formula (I) ##STR1## wherein R.sub.1 represents a hydrogen atom, a methyl group, or an aryl group, and R.sub.2 represents a hydrogen atom, or R.sub.1 and R.sub.2 may be bonded together to form --(CH.sub.2).sub.n -- in which n represents an integer of 3 to 5, which comprises reacting a compound of the following formula (II) ##STR2## wherein R.sub.1 and R.sub.2 are as defined, with bromine under radical generating conditions.

Abstract: (5-Methyl-2-oxo-1,3-dioxolen-4-yl)methyl 6-[(hexahydro-1H-azepin-1-yl)methyleneamino]penicillanate of the following formula (I) ##STR1## or its pharmaceutically acceptable acid addition salt. The compound is useful as an antibacterial agent and may be prepared by reacting (5-methyl-2-oxo-1,3-dioxolen-4-yl)-methyl 6-aminopenicillanate of the following formula (II) ##STR2## or its acid addition salt with chloro-N,N-hexamethyleneformiminium chloride, and as required, converting the resulting compound to its pharmaceutically acceptable acid addition salt.

Abstract: A novel Ampicillin ester of the general formula ##STR1## wherein R.sub.1 represents a hydrogen atom, a methyl group or an aryl group, and R.sub.2 represents a hydrogen atom or may be taken together with R.sub.1 to form a divalent carbon chain residue, or its acid addition salt.The novel Ampicillin ester or its acid addition salt is prepared by (1) reacting a corresponding 6-N-acylamino penicillanic acid (II) or its salt with a compound of the formula ##STR2## wherein R.sub.1 and R.sub.2 are as defined above, and X is a halogen atom, or reacting a compound of the formula ##STR3## wherein R.sub.1 and R.sub.

Abstract: A 1,3-dioxolen-2-one derivative of the general formula ##STR1## wherein R.sub.1 represents a hydrogen atom, a methyl group, or an aryl group, R.sub.2 represents a hydrogen atom, or may be taken together with R.sub.1 to form a divalent carbon chain residue, and x represents a halogen atom.The above compounds can be prepared by reacting a compound of the general formula ##STR2## with a halogenating agent, and are useful as protective group-introducing reagents for introducing protective groups into reagents in various chemical reactions, or as modifiers for prodrug preparation in medicine.

Abstract: Immediate estimation of compressive strength of concrete at the standard curing age of concrete of 28 days being not affected by the weathering of cement used in the concrete is carried out by the addition of an alkali hydroxide as well as a setting accelerator to the mortar portion obtained by wet screening of fresh concrete.