Abstract: A phenyl-pyrimidine liquid crystal compound represented by the formula: ##STR1## wherein R.sub.1 and R.sub.2 are the same or different and each represent an alkyl group having 1 to 18 carbon atoms, and X and Y each represent one of a single bond, --O--, --OCO--, --COO-- and --OCOO--, provided that one of X and Y is --OCOO--.

Abstract: A liquid crystal compound of the formula: ##STR1## wherein R.sup.1 and R.sup.2 represent C.sub.1-18 alkyl group, alkyl halide group or aralkyl halide, R.sup.1 may be the same as or different from R.sup.2, X is selected from --COOCH.sub.2 -- or --OCO--.

Abstract: An apparatus for use with a cassette having accommodated therein an ink material, a feed roller and a take-up roller for the material. A pair of driving heads in the cassette loading portion of the apparatus are automatically connectable to or disconnectable from the opposite ends of the take-up roll by spring levers which are movable in response to the loading or unloading of the cassette. When connected to the take-up roll, the heads center the take-up roll and position the roll in place axially thereof. The feed roll is positioned in place by V-shaped bearings in the loading portion. Thus, the two rolls can be positioned accurately automatically without necessitating any special procedure.

Abstract: A liquid crystal compound represented by the following general formula (1), which possess a large spontaneous polarization about room temperature and a liquid crystal composition containing a liquid crystal compound represented by the following general formula (1) ##STR1## wherein R.sup.1 represents C.sub.6-14 alkyl group, R.sup.2 represents straight or branched alkyl group with or without optically active carbon, X represents a group selected from --OCOO--, --O--, --COO--, --OCO-- or single bond, Y represents a group selected from --COOCH.sub.2 --, --OCO-- or --OCOO--, in which either X or Y is at least --OCOO-- group, m represents 0 or 1, Z represents a chlorine or bromine, a carbon atom marked with * represents optically active carbon atom.

Abstract: Polyphenyl-based liquid crystal compounds represented by the following general formula (1) and liquid crystal composition containing the same: ##STR1## wherein R.sup.1 represents a straight or branched C.sub.1-18 alkyl group, haloalkyl group, aralkyl group or haloaralkyl group with or without optically active carbon, R.sup.2 represents a straight or branched C.sub.1-6 alkyl group, haloalkyl group or aralkyl group with or without optically active carbon, W represents (1) --OCO-- or --COO--, in which case T represents a halogen atom or a methyl group, or (2) a single bond, --O-- or --OCOO--, in which case T represents a halogen atom, X represents --OCO--, --COO--, --C.tbd.C--, --CH.dbd.N--, --N.dbd.CH, Y represents single bond, --O--, --COO--, --OCO--, --CH.sub.2 --, --OCH.sub.2 --, --COOCH.sub.2 -- or --OCOCH.sub.2 --, Z.sub.1 and Z.sub.2 represent a hydrogen or halogen atom, a cyano group or nitro group, Z.sub.1 may be the same or different from Z.sub.

Abstract: A liquid crystal compound of the formula: ##STR1## wherein R.sup.1 and R.sup.2 represent C.sub.1-18 alkyl group, alkyl halide group or aralkyl halide, R.sup.1 may be the same as or different from R.sup.2, X is selected from --COOCH.sub.2 -- or --OCO--.

Abstract: A curable epoxy resin composition, comprising (1) an alicyclic epoxy resin having an average of more than one epoxy group per molecule, (2) a polybasic acid hydrazide, and (3) a latent curing agent for said epoxy resin which comprises an addition product obtained by reacting (a) a polyfunctional epoxy compound with (b) a compound having at least one functional group in the molecule selected from the group consisting of OH, SH, COOH and CONHNH.sub.2 together with a tertiary amino group, or by reacting said components (a) and (b) with (c) an organic compound which has more than two active hydrogen atoms in the molecule, said reactions occurring under conditions in which the ratio of (a) to (b) or (a) to (b) and (c) ranges from 0.8 to 2.5 equivalents of (a) per equivalent of the total active hydrogen atoms in component (b) and in components (b) and (c), the molar ratio of (c) to (b) being 0.2:1 to 1:1, and said addition product having a softening point of 60.degree. to 180.degree. C.

Abstract: Method of manufacturing a radially corrugated expander-spacer for a piston oil ring assembly, having inner and outer crowns alternately and successively laid, which can prevent its both terminal ends from nesting together during assembling of the piston oil ring assembly. The inner crowns each includes an inner peripheral piece and an opening having a circumferential width larger than that of the inner peripheral piece, and the outer crowns each includes an outer peripheral piece and an opening having a circumferential width larger than that of the outer peripheral piece. The manufacturing method comprises the steps of filling thermosetting synthetic resin having bonding force with respect to metals into the openings of inner crowns at both terminal ends of the expander-spacer, and thereafter, setting the thus filled thermosetting synthetic resin so that the resin is fixedly secured to the openings of the inner crowns at both terminal ends of the expander-spacer.

Abstract: A latent curing agent for epoxy resin, characterized in that the latent curing agent is an adduct obtained by reacting (a) a polyfunctional epoxy compound, (b) a compound having at least one OH, NH.sub.2, NH or SH group together with a tertiary amino group in the molecule and (c) a carboxylic acid anhydride is a good curing agent for epoxy resins. The present curing agent is useful in formulating storable, one-package, heat-curable epoxy resin-based compositions.

Abstract: A latent curing agent for epoxy resin, characterized in that the latent curing agent is the hydrazides of the formula (I) or (II). ##STR1## The present curing agent is useful in formulating storable, one-package, heat-curable epoxy resin-based compositions.

Abstract: An addition product obtained by reacting (a) a polyfunctional epoxy compound and (b) a compound having at least one functional group of OH group, SH group, COOH group and CONHNH.sub.2 group together with a tertiary amino group in the molecule, and an addition product obtained (a), (b) and (c) an organic compound having two or more active hydrogen atoms in the molecule (excluding a compound having an epoxy group or tertiary amino group) are good curing agents for epxoy resin. The curing agents are useful in formulating novel storable one-package, heat-curable epoxy resin-based compositions.

Abstract: Hydrazides of the formula (I) or (II)N--CH.sub.2 CH.sub.2 CONHNH.sub.2).sub.3 (I)(NH.sub.2 NHCOCH.sub.2 CH.sub.2).sub.2 N--R--N--CH.sub.2 CH.sub.2 CONHNH.sub.2).sub.2 (II)are good latent curing agents for epoxy resin, in the formula (II) R is divalent hydrocarbon residue having 2-24 carbon atoms. The curing agents are useful in formulating novel storable one-package, heat-curable epoxy resin-based compositions.

Abstract: Hydrazides of the formula ##STR1## are good curing agents for epoxy resin, in the formula R.sub.1 and R.sub.2 being each hydrogen atom, C.sub.1 -C.sub.8 alkyl radical or --CH.sub.2 CH.sub.2 SCH.sub.3, R being hydrogen atom or methyl radical. The curing agents are useful in formulating novel storable one-package, heat-curable epoxy resins-based compositions.

Abstract: Hydrazides of the formula ##STR1## are good curing agents for epoxy resin, wherein in the formula, X is an aromatic hydrocarbon residue of dihydric phenol, ##STR2## The curing agents are useful in formulating novel storable one-package, heat-curable epoxy resin-based compositions.

Abstract: Hydrazides of the formula ##STR1## are good curing agents for epoxy resin. The curing agents are useful in formulating novel storable one-package, heat-curable epoxy resin-based compositions.

Abstract: A stabilized halogen-containing resin composition which comprises (A) a halogen-containing resin, (B) at least one of methionine derivatives selected from the group consisting of compounds having the following structural formula (I) to (III) ##STR1## and (C) at least one of stabilizers selected from the group consisting of alkaline earth metal, zinc and organo tin compounds.

Abstract: A stabilized halogen-containing resin composition which comprises (A) a halogen-containing resin, (B) at least one of methionine derivatives selected from the group consisting of compounds having the following structural formula (I) to (III) ##STR1## and (C) at least one of stabilizers selected from the group consisting of alkaline earth metal, zinc and organo tin compounds.

Abstract: Stabilized halogen-containing resin compositions comprising a halogen-containing resin, at least one organo tetravelent tin stabilizer selected from the group consisting of an alkyl tin laurate and an alkyl tin maleate and as a stabilizer assistant a hydroxymercaptan compound having the following the general formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different and are each hydrogen atom, substituted or unsubstituted alkyl, alkenyl, aryl, cycloalkyl, hydroxyalkyl, alkoxyalkyl, carboalkoxyalkyl, epoxyalkyl or epoxyalkenyl, with the proviso R.sub.1 and R.sub.3 may form a ring together.

Abstract: Stabilized halogen-containing resin compositions having improved thermal stability and weather resistance comprising a halogen-containing resin and as a stabilizer, an organic phosphate ester having the general formula: ##STR1## wherein R.sub.1 to R.sub.4 are the same or different organic radicals, A represents hydrocarbon residue of polyhydric compound having 2 to 6 hydroxyl groups, m and n are each an integer of 1 to 3, and m+n is equal to the total number of hydroxyl groups in polyhydric compound.

Abstract: The invention disclosed relates to a drive mechanism for an image transfer type copying apparatus which comprises first and second drive sources independent of one another. The first drive source is for driving photosensitive member and scanning movement of original scanning means whereas the second drive source is for driving developing means and return movement of original scanning means so as to prevent slippages in synchronism and in image transfer cause by a shock or impact generated at the time of initiation of return movement of scanning means or at the times of initiation and stop of the developing means.