Abstract:
A lens-type functional retroreflecting sheet having a retroreflecting region and a visual function exhibiting region, and comprising a substrate sheet which includes a supporter having a functional resin layer containing a phosphorescent or fluorescent functional pigment, a minute ball lens burying region where minute ball lenses are buried in the surface of the functional resin layer in such a way that the minute ball lenses are densely arranged and form a single layer, and a minute ball lens non-burying region where the minute ball lens is substantially not buried and the functional resin layer is exposed; a transparent protective film which is provided above the minute ball lens side surface of the substrate sheet; and a junction part where the substrate sheet and the transparent protective film are partially joined together. The lens-type functional retroreflecting sheet provides an excellent visual recognizability for a recognizer on the light source side such as a car driver and, further, provides the excellent visual recognizability for a recognizer on the side opposite to the light source side such as a pedestrian at night.
Abstract:
An encapsulated-lens retroreflective sheeting comprising a monolayer of lenses partially embedded in a binder layer, a specularly reflective layer underlying the lenses in optical association therewith, and a cover film bonded to the binder layer, wherein said cover film comprises a polyester film or a polyvinyl chloride film. The cover film has an adhesion bonding interface on the surface in at least partial contact with the binder layer. The sheetings of the invention exhibit improved dimensional stability under heat and shrink resistance while maintaining impact resistance and other desirable properties of pavement markings.
Abstract:
A retroreflective applique (10) includes a supporting structure (12), a layer of optical lens elements (14), and a reflective material (16). The layer of optical lens elements (14) is partially embedded in the supporting structure (12), and the reflective material (16) is disposed on the embedded portion of the layer of optical lens elements (14). The supporting structure (12) may contain a binder layer (24) and a heat-activatable adhesive layer (26). The binder layer (24) includes a non-filamentary acrylic polymer layer. The use of such a supporting structure (12) eliminates the need for a release liner on the rear surface (20) of the heat-activatable adhesive layer (26), and it also enables a carrier web (28) to be separated from the polymeric supporting structure (12) before the applique (16) is permanently secured to a substrate. The separation step can be accomplished without causing substantial harm to the retroreflective performance of the applique (10).
Abstract:
A retroreflective sheet manufacturing method having the steps of placing a light-permeable protective film on glass beads in a support sheet which consists of a binder layer and a reinforcing layer, and which is provided with retroreflective glass beads buried in the binder layer, and thermally deforming parts of the support sheet under heating and pressure so as to partially bond the binder layer of the support sheet to the protective film, characterized in that the reinforcing layer of the support sheet consists of a crosslinked resin having shearing stress S in the range of 6x10 -1.2x10 dyne/cm before the thermal deformation of the support sheet has been carried out. A retroreflective sheet manufactured by this method has a high uniformity of the joint portions of the support sheet and protective film. Even when this retroflective sheet is used outdoors for a long period of time, troubles including the separation of the protective film do not substantially occur. This retroreflective sheet can be utilized extensively as a road sign board, a license plate for a vehicle, a sign board for construction work and an advertisement board.
Abstract:
A retroreflective sheet (10) capable of exhibiting an excellent decorative effect during both daytime and nighttime, and particularly an excellent rainbow-colored decorative effect. The sheet comprises, in order, a binder (3) in the back side of which a plurality of microspheres (2), arranged in a monolayer, are partially embedded, a focusing layer (4) underlying some of the microspheres, and a reflective layer (5) underlying the focusing layer (4) and underlying microspheres (2) which do not have a focusing layer therebehind. The focusing layer has a film thickness selection coefficient x in the range of 0.16 to 0.95 as defined by equation (II) of equations (I) and (II), wherein f is the coefficient for the optimum layer thickness of the layer, d is the diameter of the microspheres (12), h is the thickness of the focusing layer (4), nb is the refractive index of the binder layer (3), ng is the refractive index of the microspheres (2), and ns is the refractive index of the focusing layer (4).
Abstract:
A retroreflective sheeting has a multitude of retroreflective elements (10) that include a layer of optical elements (1) and a reflective element(s) (2) that is positioned functionally behind the optical elements (1). The retroreflective elements (10) are supported by a polymeric layer (3), and a pressure-sensitive adhesive layer (4) positioned below the support layer. The adhesive layer (4) contains a polyurethane crosslinked by at least an isocyanate compound. The polyurethane is polymerized from a component containing a polyol having at least one alkyl side chain in a molecule, and the adhesive has (i) a storage module of about 2 x 10 to 8 x 10 dyne per square centimeter when measured in a tensile mode at a frequency of 35 Hz and 25 DEG C, and (ii) a softening point of about 80 DEG C to less than 200 DEG C.
Abstract:
This invention relates to glass microsphere (bead) coated articles (5) having an upper surface comprising a layer of low refractive index transparent glass microspheres (1) such as those made from recycled ordinary glass. The articles of the invention have an extremely smooth tactile feel and a low friction surface even though they can be prepared from glass microspheres intermixed with abrasive irregularly shaped glass particles (2). The invention relates to a method making the bead coated articles of the invention and transfer articles that can be used to make the bead coated articles of the invention.
Abstract:
An exposed lens retroreflective article (10) has in sequence a layer of microspheres (12), a polymeric intermediate layer (18), a metal reflective layer (16), and a polymeric binder layer (14). Microspheres (12) are partially embedded in the binder layer (14), and the intermediate layer (18) and the metal reflective layer (16) are disposed between the microspheres (12) and the binder layer (14) such that the intermediate layer (18) is in contact with microspheres (12). Retroreflective articles of this construction provide improved laundering durability.
Abstract:
Retroreflective signage articles comprise a colorant layer directly thermally transferred to a top layer of a retroreflective sheeting, the top layer devoid of priming treatments and extraneous print-receptive layers. Systems or kits are also described comprising a retroreflective base sheeting in combination with a thermal mass transfer donor element, the donor elements comprising a carrier and a colorant layer adhered thereto, the colorant layer of the signage articles and the donor elements comprising a binder and a colorant. Methods of producing the signage articles employing the systems or kits are also presented.
Abstract:
A retroreflective article (100, 200, 300) includes a monolayer of retroreflective elements (120, 220, 320), a binder layer (110, 210, 310), and a compound comprising an aromatic bidentate moiety. The retroreflective elements (120, 220, 320) are partially embedded in the binder layer (110, 210, 310), and the compound is chemically associated with the retroreflective elements (120, 220, 320) to provide extraordinary laundering durability to the retroreflective article (100, 200, 300).