Japan Institute of Advanced Dentistry

Hoya Lens Corporation

Hoya Corporation

Adell Co., Ltd.

Shigeo Komiya

Eiichi Masuhara

Takeyuki Sawamoto

Niro Tarumi

Kiyomi Sanbonmatsu

Makoto Tsuchiya

Shusuke Kimura

Noboru Nishiyama

Yumiko Satou

Koji Ozeki

Kensuke Nakajima

Mitsuo Sugimura

Tetsuro Izumitani

Shin Makino

Satoko Maeda

Hideyuku Futamura

A photopolymerizable adhesive consisting of Compound (1) which contains at least one (meth)acryloxy group as a polymerizing group in its molecule, and other structures constructed from the group(s) selected from the group consisting of alkyl group, alkyloxy group, polyalkoxy group, siloxanyl group and the substituted group thereof substituted by fluorine, hydroxy or alkoxy group; Compound (2) selected from (meth)acrylic acids, hydroxyalkyl (meth)acrylates, (meth)acryloxyalkyl succinic acids, trialkoxyvinyl silanes and .gamma.-(meth)acryloxyalkyl trialkoxy silanes; and Compound (3) selected from hydroxyacetophenones, acetophenones, glyoxy esters and camphorquinones, wherein said adhesive comprises 3 to 60 wt % of the compound (2), and 0.1 to 2 wt % of the Compound (3).

Photopolymerizable adhesive composition

Photopolymerization initiator for visible light-polymerizing adhesive

Photocuring adhesive containing an oligo siloxanyl di(meth)acrylate

Photosetting resin for making strong, tough resin articles

Disclosed herein are an orthodontic bracket which comprises a photopolymerization-type adhesive layered and fixed on a back surface portion of a bracket main body made of a light-transmitting material, a kit which comprises the bracket hermetically sealed in a light-shielding container, and a process for the adhesion of the bracket.

Process for adhesion of orthodontic bracket

A bracket for orthodontics having a bracket body made of a composite resin material and a thin layer of a synthetic resin material in a dental adhesive. The synthetic resin layer is laminated on the base surface of the bracket body in such a manner that the composite resin material of the bracket body and the synthetic resin of the thin layer are mingled with each other at the boundary therebetween. The thin resin layer is composed of polymethyl methacrylate having an average molecular weight of 1000,000 or less or a polymethacrylate copolymer.

Bracket for orthodontics

A method to continuousky harden light-curable resins, by irradiating at least one shaped article made of a light-curable resin by continuously moving the article past a multiplicity of light sources while changing the flux of the irradiated light in multiple steps corresponding to the moving positions of the object and an apparatus to accomplish this method including means to continuously move the article relative to the multiple irradiation sources and means to adjust the flux density in multiple steps corresponding to the moving positions of the article. Specifically, the flux density of the light irradiated on the moving article is changed stepwide depending upon the position and the location of the article and the polymerization speed of the article and the hardening depth can be controlled in relation to its position and time.

Method and apparatus for continuous hardening of light-curing resins

A method and apparatus to continuously harden articles made of visible light-curable resins, including continuously moving the articles to be hardened relative to a multiplicity of sources of visible light which are independently controllable to be able to vary the radiation to which the articles is exposed during its passage while independently controlling the temperature at which this takes place; and apparatus to accomplish this such that a large number of the objects to be irradiated passing through the hardening apparatus have the same exposure history to the visible light and to heating or cooling respectively. As the result, there is substantially no variation in the physical properties of these photo-polymerized products.

Method and apparatus for continuous hardening of visible light-curing

Dental light-curing resins are cured with light and under pressure by placing the uncured resin on a cast or mold or dental appliance to be prepared then covered with a transparent or translucent flexible membrane or sheet. In a chamber gas pressure is applied to the sheet and, in turn, to all parts of the underlying resin and, while pressurized, the resin is exposed to light to cure it.

Method for light curing of dental light-curing resins

A soft contact lens having a high water content, high mechanical strength and good dimensional stability is disclosed, which is made of a copolymer comprised of at least one monomer represented by formula (1): ##STR1## wherein R.sup.1 and R.sup.2 each represents hydrogen atom, methyl group, or ethyl group, and n.sub.1 represents 0 or an integer of 1 to 3.

Soft contact lens

A high-hydration contact lens having a high strength is disclosed which is made of a copolymer composed of (i) 40 to 90 wt. % of N,N-dimethyl acrylamide, (ii) 5 to 50 wt. % of a hydrophobic monomer, (iii) 0.1 to 10 wt. % of an unsaturated carboxylic acid having one ethylenically unsaturated bond, and (iv) 0.01 to 5.0 wt. % of a crosslinking agent, wherein the hydrophobic monomer is selected from the group consisting of phenyl acrylates, benzyl acrylates, phenyl methacrylates, benzyl methacrylates, alkyl acrylates, alkyl methacrylates, cyclohexyl acrylates and cyclohexyl methacrylates, and the crosslinking agent is selected from those represented by formula (I), (II), or (III) ##STR1## wherein X represents a hydrogen atom or a methyl group, a is an integer of 2 to 23, and b and c each is an integer of 2 to 14.

High-hydration contact lens

A lens having a high refractive index with a low dispersion produced by copolymerizing a polyfunctional allyl monomer with at least one monomer selected from the group represented by the general formula A: ##STR1## X: H, CH.sub.3, Cl Y: H, CH.sub.3, C.sub.2 H.sub.5, n-C.sub.3 H.sub.7, iso-C.sub.3 H.sub.7, OCH.sub.3, C.sub.6 H.sub.11, Cl, Br, CH.sub.2 Cl, CH.sub.2 Br, C.sub.6 H.sub.5, CH.sub.2 C.sub.6 H.sub.5, SCH.sub.3

Lens having a high refractive index with a low dispersion

A high refractive lens of a terpolymer produced by the polymerization of ternary monomers comprising diethylene glycol bisallyl carbonate, triallylisocyanurate, and benzyl methacrylate. This lens is considerably improved in its physical properties necessary for lens such as superficial hardness, transmittance, and adhesion strength of glass film coated on the surface, as well as having a high refractive index.

Terpolymer with a high refractive index

The present invention relates to a copolymer for high refractive lens having a refractive index equal to or higher than 1.55, obtained by copolymerization of one or more of the first monomer component having the formula (I) ##STR1## wherein R.sub.1 signifies hydrogen atom or methyl radical, R.sub.2 signifies hydrogen atom or methyl radical, and m and n signify integers 0 to 4 in total, with one or more of the radically polymerizable second monomer component, homo-polymer of which has a refractive index equal to or higher than 1.55 and, if necessary, with the radically polymerizable third monomer component, the homo-polymer of which has a refractive index lower than 1.55 and to the lens prepared from said copolymer.

Growing community of inventors

Urawa, Japan

Shigeo Komiya