摘要:
The invention relates to a compound having antimicrobial and antitumor activity, the compound being designated FR901228 substance of the following formula: ##STR1##
摘要:
A catalyst for the polymerization of olefins comprising a combination of a solid catalyst component (A) comprising a solid catalytic complex (i) containing titanium, magnesium and a halogen as the essential ingredients with an organoaluminium compound (B), wherein said solid catalyst component (A) is obtained by bringing the following ingredients (ii) and (iii) in contact with said solid catalytic complex (i):Ingredient (ii): a silicon compound represented by the general formula:R.sub.m.sup.1 X.sub.n Si(OR.sup.2).sub.4-m-nwherein R.sup.1 and R.sup.2 each stand for a hydrocarbyl residue, X denotes a halogen, and m and n are such that 0.ltoreq.m.ltoreq.3 and 0.ltoreq.n.ltoreq.3 are satisfied on condition that 0.ltoreq.m+n.ltoreq.3, andIngredient (iii): an organometallic compound selected from the group consisting of organozinc compounds and organomagnesium compounds. The catalyst makes it possible to eliminate what is called "outside electron donor" as a component for making up a final catalyst system.
摘要:
Compounds of formula (I): ##STR1## in which: R.sup.1 and R.sup.2 are independently hydrogen, alkyl, aliphatic hydrocarbon groups having one or two carbon-carbon double or treble bonds, cycloalkyl, aryl, substituted aryl, aralkyl, substituted aralkyl, alkanoyl, alkenyol, cycloalkylcarbonyol, arylcarbonyl, substituted arylcarbonyl, arylalkanoyl, substituted arylalkanoyl, arylalkenoyl, substituted arylalkenoyl, alkoxycarbonyl, aryloxycarbonyl, substituted aryloxycarbonyl, aralkyloxycarbonyl, substituted aralkyloxycarbonyl, optionally substituted carbamoyl or thiocarbamoyol, alkylsulfonyl, haloalkylsulfonyl, arylsulfonyl, substituted arylsulfonyl, alkylthio, arylthio and substituted arylthio, or R.sup.1 and R.sup.2, together with the nitrogen atom to which they are attached, form a nitrogen-containing heterocyclic group; one of R.sup.a and R.sup.b is hydrogen, alkyl or halogen, and the other of R.sup.a and R.sup.b is a group of formula (II): ##STR2## R.sup.4 is hydrogen, carboxy, protected carboxy or optionally substituted carbamoyl; R.sup.5 is hydrogen, or carboxyalkyl or protected carboxyalkyl in which the alkyl part is C.sub.1 -C.sub.6 ; n=0, 1 or 2; X is oxygen or sulfur; are useful in the treatment of the complications attendant upon diabetes and may be prepared by condensation of a thiazolidine or rhodanine compound with a compound corresponding to the remainder of the molecule of the compound of formula (I).
摘要:
A catalyst for olefin polymerization which comprises:Component (A) which is a solid catalyst component obtained by contacting the following components (i) to (iv):(i) a solid component comprising titanium, magnesium and halogen as essential elements,(ii) a silicon compound represented by the formula (I):R.sup.1.sub.m X.sub.n Si(OR.sup.2).sub.4-m-n (I) wherein R.sup.1 and R.sup.2 each represent a hydrocarbon residue, X represents a halogen, and each of m and n is an integer in the range of 0.ltoreq.m.ltoreq.3, 0.ltoreq.n.ltoreq.3, and 0.ltoreq.m+n.ltoreq.3,(iii) a titanium compound or a silicon compound represented by the formula (II) or (III):Ti(OR.sup.3).sub.4-l X.sub.l (II)R.sup.4.sub.4-l SiX.sub.l (III) wherein R.sup.3 represents a hydrocarbon residue, R.sup.4 represents hydrogen or a hydrocarbon residue, X represents a halogen, and l is an integer in the range of 0
摘要:
Disclosed is a catalyst component for polymerization of an olefin, which consists essentially of a contact reaction product of (A) a solid composition obtained by mixing and contacting a precipitating agent with a contact reaction product between a magnesium dihalide and a titanium tetraalkoxide and/or a polymer thereof, the addition of the precipitating agent being carried out with stirring at a stirring intensity lower than a level (2nf) two times the floatation limit stirring intensity (nf) of the reaction system, with (B) a liquid titanium compound and/or a halogen compound of silicon.This catalyst component has a high activity and provides a polymer in which the particle size is relatively large and the particle size distribution is sharply controlled.
摘要:
A transparent liquid container bottle features a label with a tinted backside which imparts a tinted appearance to the contained liquid. The bottle has a cylindrical body, a hemispherical top and a base cup. The base cup may be tinted to match the backside of the label. The label covers only part of the cylindrical body, leaving an unlabeled section with a dimension 0.1 to 2.0 times, or 0.5 to 1.2 times preferably, the diameter of the body.
摘要:
Provided is a presensitized planographic printing plate requiring no dampening water for use in negative work which comprises a base substrate, a photosensitive layer secured to and overlying the base substrate, and containing an orthoquinonediazide compound and having a content of ethanol-soluble component not higher than 20% by weight, and a silicone rubber layer overlying the photosensitive layer through bonding component. When the printing plate is exposed through a negative film and then treated with a developer, the photosensitive layer in the exposed image areas is dissolved and the corresponding portion of the silicone rubber layer is also removed easily and is obtained image as an exact reproduction of the negative film. Dampening water is not required when printing is carried out.
摘要:
A solid catalyst component for olefin polymerization and a catalyst are disclosed that exhibit high catalytic activity when used for gas-phase polymerization, suppress rapid reactions in the initial stage of polymerization relative to the polymerization activity, and can produce a propylene polymer in high yield while maintaining high stereoregularity. The solid catalyst component for olefin polymerization includes magnesium, titanium, a halogen, and an internal electron donor, the solid catalyst component including an asymmetrical phthalic diester represented by the following general formula (1) in a molar ratio of 0.2 to 0.8 relative to the total content of the internal electron donor. R1k(C6H4-k)(COOR2)(COOR3) (1) wherein R1 is an alkyl group or the like, R2 is a linear or branched alkyl group having 2 to 6 carbon atoms or an alkenyl group, R3 is a linear or branched alkyl group having 1 to 5 carbon atoms, the number of carbon atoms included in R3 being smaller than the number of carbon atoms included in R2, and k is an integer from 0 to 4 that indicates the number of substituents R1.
摘要:
In an overlapping head including a plurality of recording head chips overlapped to each other, a color shift can occur between a color recorded by an overlapping region and a color recorded by a non-overlapping region, which cannot be corrected by a density correction using head shading or the like. To correct such a color shift, a test pattern is recorded by the overlapping region and the non-overlapping region and colors of the recorded test pattern are measured. Color correction data to be used in correction of colors of an image to be recorded is generated based on a result of the measurement of the colors.
摘要:
A solid catalyst component for olefin polymerization and a catalyst are disclosed that exhibit high catalytic activity when used for gas-phase polymerization, suppress rapid reactions in the initial stage of polymerization relative to the polymerization activity, and can produce a propylene polymer in high yield while maintaining high stereoregularity. The solid catalyst component for olefin polymerization includes magnesium, titanium, a halogen, and an internal electron donor, the solid catalyst component including an asymmetrical phthalic diester represented by the following general formula (1) in a molar ratio of 0.2 to 0.8 relative to the total content of the internal electron donor. R1k(C6H4-k)(COOR2)(COOR3) (1) wherein R1 is an alkyl group or the like, R2 is a linear or branched alkyl group having 2 to 6 carbon atoms or an alkenyl group, R3 is a linear or branched alkyl group having 1 to 5 carbon atoms, the number of carbon atoms included in R3 being smaller than the number of carbon atoms included in R2, and k is an integer from 0 to 4 that indicates the number of substituents R1.