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:
Acrylic multilayer polymer powders containing coagulated powders of emulsified latexes of acrylic multilayer polymers, which are suitable for drying methods using pressure dehydration extruders, etc, comprises not more than 40 wt % of a fine powder of a particle size of 212 .mu.m or less after drying, and have a volume of gaps of a pore size of 5 .mu.m or less after drying of not more than 0.7 cc per unit weight as measured by a mercurial pressure method. A desired monomer is subjected to emulsion polymerization to produce an emulsified latex of an acrylic multilayer polymer, which is then poured into a coagulating solution for coagulation.
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.
摘要:
A novel aromatic polyamide crystalline complex capable of being molded at low temperatures is produced by contacting an aromatic polyamide in which at least 75 mol % of repeating unit comprises m-phenyleneisophthalamide with at least one member selected from the group consisting of hexamethylphosphoric amide, N-methyl-2-pyrrolidone, .epsilon.-caprolactam and 2-pyrrolidone to form a crystalline complex and then removing the hexamethylphosphoric amide, N-methyl-2-pyrrolidone, .epsilon.-caprolactam and 2-pyrrolidone which are not contained in the crystal.
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:
This invention provides novel thermosetting preform having superior transparency which is composed of the resin produced by partially polymerizing the mixture of (A) 4 to 30 wt % of at least one vinyl monomer containing carboxyl group, (B) 4 to 96 wt % of at least one vinyl monomer containing glycidyl group, and (C) up to 92 wt % of at least one copolymerizable monomer, said preform being characterized in that the amount of unreacted monomer remaining therein is less than 20 wt % and the glass transition temperature range is 120.degree. C. or lower. This invention also provides a method of production of a highly transparent molded article with high productivity which is superior in heat resistance and in chemical resistance by heating and molding said preform.
摘要:
An improved image-transmitting synthetic resin rod comprising a reaction product of an acrylic resin .circle.1 containing epoxy groups with a material .circle.2 having a refractive index 0.15-0.35 lower than that of said acrylic resin .circle.1 , and distributed in said rod so as to satisfy equation (1):n.sub.r.sup.2 =n.sub.a.sup.2 [1-(gr).sup.2 +h.sub.4 (gr).sup.4 +h.sub.6 (gr).sup.6 ] (1)0.03.ltoreq.gr.sub.0 .ltoreq.0.45.vertline.h.sub.4 -2/3.vertline..ltoreq.100.vertline.h.sub.6 +17/45.vertline..ltoreq.1,000wherein r is the radial distance from the center axis of the rod (0.ltoreq.r.ltoreq.r.sub.0),r.sub.0 is the radius of the rod,n.sub.r is the refractive index at point r,n.sub.a is the refractive index at the center of the rod,g is the distribution constant of the refractive index, andh.sub.4 and h.sub.6 are high order coefficients,and a process for producing the same.
摘要:
[Purpose] To provide a light regulating film and a laminated light regulating film with relatively large crazes or cracks, capable of controlling optical properties such as transmissivity and scattering to a high degree, as well as a method for producing a light regulating film and a method for producing a laminated light regulating film.[Constitution] 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.