摘要:
A transparent resin obtained by polymerizing a monomer having an alkylene oxide group, a polyfunctional (meth)acrylate having a divalent branched hydrocarbon group and other copolymerizable vinyl monomer, if necessary, is suitable as an elementary material for a plastic lens with excellent heat resistance and hue.
摘要:
An optical resin obtained by polymerizing 97 to 50% by weight of methyl methacrylate, 3 to 30% by weight of an N-substituted maleimide, and 0 to 40% by weight of an unsaturated monomer by suspension polymerization at a pH of 5.5 to 7.5 is excellent in heat resistance and transparency.
摘要:
A photocurable resin composition including: (A) a urethane (meth)acrylate oligomer having a polyoxyalkylene structure, (B) a (meth)acrylic polymer, (C) a (meth)acrylic monomer, and (D) a photopolymerization initiator, wherein the component (A) is produced using monomer components including (a1) a polyoxyalkylene polyol, (a2) a polyisocyanate, and (a3) a hydroxyl group-containing mono(meth)acrylate compound, a relationship N (=n1/n2) between the total mass n1 of the monomer components and the total equivalent weight n2 of acryloyl groups within the all monomer components is 4,000 or greater, and the component (A) is substantially free of unreacted isocyanate groups.
摘要:
A process for the preparation of a non-birefringent optical resin, characterized by copolymerizing a monomer mixture consisting of the following monomers (A) to (E) at such a ratio as to give the resin having an absolute value of orientational birefringence of less than 1×10−6; wherein (A): 5 to 40 wt % of a methacrylic or acrylic ester having a C5-C22 aliphatic hydrocarbon group in the ester moiety; (B): 50 to 80 wt % of methyl methacrylate; (C): 5 to 40 wt % of an N-substituted maleimide; (D): 0 to 30 wt % of benzyl methacrylate; (E): 0 to 10 wt % of a monomer copolymerizable with these monomers, and optical elements made by using the resin prepared by this process.
摘要:
A transparent resin obtained by polymerizing a monomer having an alkylene oxide group, a polyfunctional (meth)acrylate having a divalent branched hydrocarbon group and other copolymerizable vinyl monomer, if necessary, is suitable as an elementary material for a plastic lens with excellent heat resistance and hue.
摘要:
A transparent resin obtained by polymerizing styrene, a methacrylic or acrylic acid ester, a polyfunctional monomer, and if necessary a copolymerizable vinyl monomer in the presence of a molecular weight modifier is suitable for producing a polymer lens having a low specific gravity, and excellent in transparency, edging ability with other good properties.
摘要:
An optical resin material comprising a polymer containing as an essential component at least one norbornyl acrylate or methacrylate or a derivative thereof is excellent in properties, particularly in moisture resistance and can be used for molding optical elements such as lenses, optical discs, etc.
摘要:
An energy converter comprises a flexible plane unit 1 placed in a position to be exposed to a flow of fluid such as wind, at least a part of peripheral edge of the flexible plane unit 1 being capable of fluttering freely with the flow, an energy conversion unit 31 for converting vibration energy into electric energy, and a transmission unit 2 connected to the flexible plane unit 1 and for transmitting a vibration caused on the flexible plane unit by the flow to the energy conversion unit 31.
摘要:
An expandable styrene series resin composition comprising a styrene series resin containing in its molecular structure a group of the formula:--SiY.sub.n R.sub.3-n (I)wherein R is an inert monovalent organic group; Y is a hydrolyzable group; and n is an integer of 1 to 3, and a blowing agent, and if necessary, one or more organosilane compounds having at least two hydrolyzable groups in its molecule, can give foamed articles having excellent heat resistance as well as high degree of expansion and good physical and chemical properties.
摘要:
A photocurable resin composition including: (A) a urethane (meth)acrylate oligomer having a polyoxyalkylene structure, (B) a (meth)acrylic polymer, (C) a (meth)acrylic monomer, and (D) a photopolymerization initiator, wherein the component (A) is produced using monomer components including (a1) a polyoxyalkylene polyol, (a2) a polyisocyanate, and (a3) a hydroxyl group-containing mono(meth)acrylate compound, a relationship N (=n1/n2) between the total mass n1 of the monomer components and the total equivalent weight n2 of acryloyl groups within the all monomer components is 4,000 or greater, and the component (A) is substantially free of unreacted isocyanate groups.