Abstract:
The present invention relates to a method of producing a sulfur-containing transparent polymer by polymerizing a composition containing a (metha)acrylate monomer having sulfur in its molecule, characterized by radical polymerization of a composition containing at least one compound selected from radical chain transfer compounds and radical trapping compounds in an amount of 0.1 to 7.0 % by weight of the total amount of the composition. The polymer obtained by polymerization is less colored. The method can provide a polymer having a high total light transmittance, a high refractive index and a light weight and is hardly yellowed during use.
Abstract:
A thiol methacrylate or acrylate compound represented by the formula (1) or (2): wherein R is H or CH3 and X is selected from: wherein R is H or CH3 and m is an integer of 1 to 4, is polymerizable to obtain a resin having a high refractive index, a large Abbe number, and a good hardness and heat resistance, and giving little or no smell on processing.
Abstract:
EPOXY TYPE SPHERICAL PARTICULATE ADHESIVE AND PROCESS FOR PREPARATION THEREOF A spherical particulate adhesive comprising at least an epoxy resin as the main component and having an average particle size of 0.3 to 500 .mu.m, in which particles of the epoxy resin contain a latent curing agent homogeneously in the interior thereof. This adhesive is a heat-curable adhesive and has a very high bonding force. After bonding, the adhesive is chemically stable and is especially preferably used for bonding in the field of electronic materials, such as liquid crystal display devices, which are apt to be degraded by impurities and for which high-precision bonding is required.
Abstract:
LIQUID CRYSTAL ELECTRO-OPTICAL ELEMENT WITH ADHESIVE PARTICLES In an electro-optical element comprising a liquid crystal, such as a smectic liquid crystal, sealed between two substrates arranged to confront each other with a space of an order of .mu.m, if spacer particles for regulating the space between the substrates and phenol type curing agent-incorporated epoxy resin adhesive particles for moderating stresses generated by distortions or warps of the substrates are arranged in the space between the substrates, a minute uniform space, especially a uniform space of 1 to 3 .mu.m effective for a ferroelectric liquid crystal, can be maintained between the substrates. In this structure, alignmental films are not disturbed at all. Furthermore, even if a nematic or super-twist liquid crystal is used, a uniform space can be stably maintained between the substrates.
Abstract:
A thiol methacrylate or acrylate compound represented by the formula (1) or (2): wherein R is H or CH3 and X is selected from: wherein R is H or CH3 and m is an integer of 1 to 4, is polymerizable to obtain a resin having a high refractive index, a large Abbe number, and a good hardness and heat resistance, and giving little or no smell on processing.
Abstract:
An optical article which has an organic silicon compound layer on the surface thereof, characterized as exhibiting a contact angle for an artificial finger print liquid on said surface of 60 DEG or more and a falling angle for the artificial finger print liquid of 30 DEG or less; a method for coating an optical article with an organic silicon compound which involves vaporizing the compound in a vacuum vessel, characterized in that the organic silicon compound has been subjected to condensation polymerization in advance: and a specific organic silicon compound for use in the optical article. The optical article has advantages in that it is less susceptible to staining and is easy to remove stains. The optical article can be suitably used in applications such as image planes of various displays, plains for display in various display devices, optical filters, eyeglass lenses, optical lenses, luminaries, cases or show windows for exhibition, frames for picture, windowpanes and the like; and also for optical goods attached to the items described above.