摘要:
Disclosed is an optically active compound represented by the formula: ##STR1## or a single bond, Z stands for a hydrogen atom, a halogen atom or a cyano group, R.sub.1 stands for an alkyl group or fluoroalkyl group having 1 to 18 carbon atoms, R.sub.2 stands for an alkyl group or alkoxy group having 1 to 18 carbon atoms, and *C stands for the asymmetric carbon atom. This compound is used as a ferroelectric liquid crystal or an additive to a ferroelectric liquid crystal.
摘要:
Disclosed is an optically active substance represented by the formula: ##STR1## wherein m is an integer of 1 to 14, Y is ##STR2## R is --C.sub.n H.sub.2n+1, --OC.sub.n H.sub.2n+1, --OCOC.sub.n H.sub.2n+1 or --COOC.sub.n H.sub.2n+1 (in which n is an integer of 1 to 18), each of the asterisked carbon atoms is an asymmetric carbon atom, X a single bond, --CO.sub.2 --, or --OCO--, and A.sub.1 and A.sub.2 is hydrogen, fluorine, chlorine, bromine, cyano or methoxy.
摘要:
Disclosed is a mesomorphic compound having a .beta.-hydroxycarboxyl group as the chiral source, which is represented by the formula: ##STR1## wherein m and n are integers of from 1 to 18, X.sub.1 and X.sub.2 independently represent fluorine, chlorine or hydrogen, Y represents ##STR2## or --O--, Z represents a direct bond, ##STR3## --CH hd 2O-- or --OCH.sub.2 --, and * indicates the asymmetric carbon. The mesomorphic compound is valuable as a ferroelectric liquid crystal or an additive to a ferroelectric liquid crystal or to a compound showing the SmC phase and having no chiral group.
摘要:
An optically active compound having a .delta.-valerolactone ring which is a ferroelectric liquid crystal and is represented by the following general formula (I): ##STR1## wherein m is an integer of from 1 to 8, Z is a group represented by the following formula: ##STR2## in which each of l and k is a number of 1 or 2 and l and k satisfy the requirement of 2.ltoreq.(l+k).ltoreq.3,X stands for a direct bond, ##STR3## Y stands for ##STR4## and A.sub.1 and A.sub.2 independently stand for --H, --F or --Cl, ##STR5## R stands for ##STR6## in which n is an integer of from 1 to 18, and * indicates the asymmetric carbon atom.
摘要:
Disclosed is an .alpha.-methylcinnamic acid ester derivative represented by the formula: ##STR1## wherein n is an integer of from 5 to 18, R.sub.1 represents an optically active group of the formula ##STR2## in which m is an integer of from 1 to 5 and *C represents an asymmetric carbon atom, and R.sub.2 represents ##STR3##The .alpha.-methylcinnamic acid ester derivative is valuable as a ferroelectric liquid crystal or an additive to a ferroelectric liquid crystal.
摘要:
A multilayered acrylic polymer comprising an innermost layer polymer (A) formed from a C1-4 alkyl methacrylate, a C1-8 alkyl acrylate, etc., an intermediate layer polymer (B) formed from a C1-8 alkyl acrylate, an aromatic vinyl monomer, etc., and an outermost layer polymer (C) formed from a C1-4 alkyl methacrylate, a C1-8 alkyl acrylate, etc., and wherein the average value of the coating ratio, i.e. [(minimum thickness of the intermediate layer)÷(maximum thickness of the intermediate layer)]×100, is not less than 30%; and a methacrylic resin composition containing the same. This multilayered acrylic polymer can improve the falling-ball or falling-weight impact strength, resistance to impact whitening, transparency and other properties of the methacrylic resin composition.
摘要:
A photopolymerizable resin composition is described which comprises, (a) 40 to 85 wt. %, based on the composition, of a thermoplastic polymer binder, (b) 15 to 60 wt. %, based on the composition, of a cross-linkable monomer having at least one ethylenically unsaturation, (c) 0.5 to 10 wt. %, based on the total of the binder (a) and the monomer (b), of a photopolymerization initiator, and (d) 0.005 to 1 wt. %, based on the total of the binder (a) and the monomer (b), of a tetrazole compound of the formula: ##STR1## wherein R.sub.1 is H, halogen, methyl, ethyl, phenyl, carboxyl, amino, dimethylamino, diethylamino, methoxy, ethoxy, mercapto or sulfonic acid; and R.sub.2 is H, methyl, ethyl, phenyl, amino or mercapto. The photopolymerization resin composition exhibits an enhanced adhesion to a metal surface, and is useful as a photoresist for fabrication of a printed circuit board.
摘要:
Linear notch patterns at fixed intervals are formed by contacting blades 6a on a drum 6 with a film F and mechanically transferring the shape of the blades 6a to the film F. The notch pattern is formed to be approximately parallel to the axial direction of the drum 6. When a flexural stress is applied in the direction of the film F transport by passing the film over the bending roll 8 while applying a predetermined tension thereto, crazes or cracks are formed inside the notch patterns, with the notches in the notch patterns serving as starting points thereof. Since crazes or cracks are formed using the notch patterns as starting points, relatively large crazes or cracks can be obtained, and optical characteristics can be controlled at a high level.
摘要:
Photo, electron beam and x-ray sensitive resins are comprised of a 2-alkylglycidyl methacrylate homopolymer or a copolymer containing at least 50 mol % of alkylglycidyl methacrylate. The resins have excellent resolving power and sensitivity and are useful for negative type resists.