Showing papers by "3M published in 1979"

Sensitized aromatic iodonium or aromatic sulfonium salt photoinitiator systems

Abstract: Iodonium and sulfonium photoinitiators are naturally sensitive to only a small portion of the electromagnetic spectrum. Various classes of sensitizing dyes for iodonium and sulfonium salts are disclosed herein.

Shaped plastic articles having replicated microstructure surfaces

Abstract: An article comprising a shaped, plastic layer or body comprising crosslinked polymer with hard and soft segments or moieties and having a microstructure-bearing surface is prepared by a process comprising filling a mold master, bearing or encoded with the microstructure to be replicated, with a fluid, castable, one-part, preferably solvent-free, radiation addition-polymerizable, crosslinkable, synthetic, organic oligomeric composition (or precursors thereof) having "hard" segments and "soft" polysiloxane segments, exposing the resulting case composition to radiation, preferably actinic radiation such as ultraviolet radiation, and thereby forming said article, e.g., a retroreflective cube-corner sheeting, Fresnel lens or video disc.

Synthetic absorbable surgical devices of poly(esteramides)

Abstract: A body absorbable polymeric material for implantation which is a condensation product of reacting a diamine with lactic or glycolic acid to form a diamidediol which is then reacted with a bischloroformate or a compound selected from the group consisting of dicarboxylic acids, methyl and ethyl esters of dicarboxylic acids, diacidchlorides, and anhydrides of a dicarboxylic acid.

Non-vitreous ceramic metal oxide microcapsules and process for making same

Abstract: Shaped and fired, porous or impermeable nonvitreous ceramic microcapsules of metal oxide, preferably transparent and polycrystalline, are made by a non-melt process comprising the liquid-liquid extraction of aqueous metal oxide precursor with a dehydrating liquid having a limited water solubility, and drying and firing the resulting gelled microcapsules. For example, an aqueous titania sol is added to an agitated body of n-butanol to form a dispersion of droplets of said sol and water is rapidly extracted from the droplets to form gelled microcapsules; the latter are recovered by filtration, dried, and fired to convert them into transparent, sealed or heat-sealable, non-vitreous ceramic, spherical microcapsules of polycrystalline titania. The microcapsules can be used as fillers for plastic and other composites or filled with a selected solid, liquid or gas for purpose of storing, transporting, or facilitating the use of the same.

Poly(ethylenically unsaturated alkoxy) heterocyclic protective coatings

Abstract: Abrasion resistant coatings are comprised of a crosslinked polymeric coating comprising at least 15% by weight of said polymer derived from a polyacrylate material having a heterocyclic nucleus therein.

Ultraviolet polymerization of acrylate monomers using oxidizable tin compounds

Abstract: Pressure-sensitive adhesive tape having a photopolymerized adhesive coating of a mixture of alkyl acrylate and/or methacrylate and preferably also copolymerizable monoethylenic monomer such as acrylic acid in which is dissolved an oxidizable tin salt such as stannous octoate. The tin salt permits thick layers of the mixture to be photomolymerized in air and allows an unusual tolerance of oxygen when photopolymerizing thin layers to provide pressure-sensitive adhesive coatings.

Method of producing a microstructured surface and the article produced thereby

Abstract: A method is disclosed for producing a micro structure on the surface of an article. The method comprises the steps of depositing a discontinuous coating of a material exhibiting a low rate of sputter etching on a substrate exhibiting a higher rate of sputter etching and differentially sputter etching the composite surface to produce a topography of pyramid-like micropedestals random in height and separation. The articles produced by this method are characterized by both the microstructured surface and by the detectable presence of the material exhibiting the lower rate of sputter etching. The microstructured surface results in the articles having uniform antireflecting properties over a large range of angles of incident light and over an extremely broad range of wavelengths, in which the antireflecting characteristic is obtained without an attendant increase in diffuse scattering. Also, the microstructured surface results in the articles being characterized by a high degree of adherence, such that the treated surface may be considered to be "primed", thereby enabling the application of highly adherent coatings or layers thereon.

Microparticles with visual identifying means

Abstract: Microparticles encoded for retrospective identification of substances into which they are incorporated. The novel microparticles have flat surfaces bearing repetitive identifying indicia such as alphanumerics which can be visually interpreted under magnification. The indicia may provide only part or all of the code.

Fluoroelastomer composition containing sulfonium curing agents

Abstract: A thermally stable, curable fluoroelastomer composition containing sulfonium curing agent is described. The composition is curable in reactive admixture with an inorganic acid acceptor and includes: (a) a fluoroelastomer comprising vinylidene fluoride; (b) at least one triorgano sulfonium compound; and (c) at least one aromatic polyhydroxy compound.

Photopolymerizable composition containing ethylenically unsaturated oligomers

Abstract: A photopolymerizable composition is disclosed which comprises 10 to 60% by weight of an ethylenically unsaturated, carboxylic acid containing oligomer, 10 to 60% by weight of an organic film forming polymer, 10 to 60% by weight of a free radical polymerizable monomer having at least one ethylenically unsaturated group, and 0.1 to 12% by weight of a free radical photoinitiator system.

Perforated closed cell padding material

Abstract: Perforated closed cell foam padding material useful with orthopedic devices, said material being capable of passing perspiration from human skin therethrough, being resiliently compressible, and being elastic in the longitudinal direction of the padding material.

Extended-life pavement-marking sheet material

Abstract: A new pavement-marking sheet material comprises a conformable base sheet, a flexible top layer adhered to the base sheet, and glass microspheres or other particulate material partially embedded and strongly supported and adhered in the top layer.

Strip material for forming flexible backed fasteners

Abstract: A strip material from which portions may be severed to form portions of fasteners, including a flexible bonding layer, U-shaped monofilaments bonded in the bonding layer and having headed projecting portions, a low density foam layer on the side of the bonding layer opposite the headed projections, and a layer of soft tacky pressure sensitive adhesive on the side of the layer of foam opposite the bonding layer.

Energy control sheet having insulative properties

Abstract: Composite energy control sheet of the type wherein a transparent-reflective metal layer is coated on a self-supporting transparent polymeric foil and protectively covered with a transparent polymeric layer. The protective polymeric layer is chosen to transmit 80% or more of the normal room temperature radiant energy spectrum (about 4-40 micrometer wavelength) so that when the energy control sheet is positioned adjacent (but other than outside of) a glazing unit and oriented so that the protective layer does not contact any face of the glazing unit, heat loss from the room is significantly decreased and the cold weather performance of the sheet is greatly improved. Among the suitable polymers for the polymeric layer are polyethylene, polypropylene and polyacrylonitrile.

Fining sheet and method of making and using the same

Abstract: A glass fining sheet particularly suited for finishing rough ground vitreous surfaces to provide a surface finish which may be readily polished comprises a flexible, conformable backing sheet bearing a microcellular abrasive granule-resin matrix which, under use conditions and in the presence of an aqueous flow, generates a fining slurry. The fining sheet according to this invention is prepared by coating a flexible conformable backing sheet with a foamed liquid abrasive granule-resin coating composition comprised of liquid curable binder material, abrasive fining granules and sufficient compatible solvent to provide a coatable composition. Such coating provides a cellular layer which releases the fining abrasive granules at a controlled rate under use conditions.

Rigid magnetic recording disks lubricated with fluorinated telechelic polyether

Abstract: Rigid magnetic recording disk is lubricated by a thin coating of a fluorinated telechelic polyether polymer having at least one polar group such as --CONHCH 2 CH 2 OH, --COOCH 3 , --CONHCH 2 C 6 H 5 , and --COCF 3 . The coating is surprisingly resistant to removal by commonly used cleaning agents.

Stapler including means for preventing double feeding of staples

Abstract: A medical stapler including a ram adapted to push a staple along a passageway from an inlet opening into which staples are fed, to an outlet opening where the staple is ejected and closed about an anvil portion. A manually activated drive mechanism is adapted to move the ram and staple from the inlet to the outlet opening, will leave the ram across the outlet opening to prevent another staple from being fed into the channel if manual activation of the stapler is discontinued before the staple is ejected, and will couple the ram to the drive mechanism when the ram reaches its eject position so that the ram will subsequently be retracted with the drive mechanism. Also the stapler clicks when the ram reaches its eject position to provide both an audible and tactile indication that the staple has been fully closed.

Surface treating pad having a renewable surface

Abstract: A surface treating pad having a renewable working surface comprises a base layer upon which is removably fastened at least one unitary stack comprising a plurality of thin layers of lofty nonwoven abrasive material. The layers on the stack are removably fastened together and to the base layer so that individual layers may be easily separated from the stack or from the base layer to expose a fresh surface treating working face without damage to the remainder of the pad. The pads are particularly suited for treating floors.

Poly(ethylenically unsaturated alkoxy) heterocyclic compounds

Abstract: Ethylenically unsaturated crosslinking agents and polymerizable monomers are disclosed. These agents contain a heterocyclic nucleus and are capable of forming oxygen insensitive, radiation curable systems.

Process for forming a microstructured transmission and reflectance modifying coating

Abstract: A process for forming single layer coatings that render a surface more light transmitting and less light reflecting without an attendant increase in diffuse scattering, which includes the steps of depositing a thin metal film on the surface and totally converting the thin metallic film to either an oxide and/or hydroxide microstructured layer by chemical or a combination of chemical and electrochemical methods. Uniform optical properties are exhibited over large angles of incidence and an extremely broad range of wavelengths.

Selective determination of nucleotides in viable somatic and microbial cells

Abstract: A method is disclosed for measuring the concentration of nucleotides and the number of viable cells in a biological sample containing somatic and/or microbial cells by treatment of a sample of cells with surface active agents to selectively release the nucleotides without rupture of the cell membrane or walls, and measuring by means of a bioluminescent assay technique the concentration of nucleotides selectively released and thereby determining the number of viable cells in the sample.

Intumescent fire retardant composites

Abstract: The disclosure relates to flexible heat expanding, fire retardant composite materials comprising an intumescent component in granular form, an organic binder component such as an elastomer, an organic char-forming component and fillers such as clay, silica, synthetic organic staple fibers or inorganic fiberglass or ceramic fibers. These composites, when subjected to heat at about 110° C., can intumesce up to ten times their original volume.

Graphic forming device with preview feature

Abstract: A device for composing graphics comprising a flash lamp for irradiating portions of strip material through a template when an arm supporting the lamp is moved to an exposure position at an exposure station. The template is pressed against the strip at the exposure station between a resilient frame-mounted pad and a transparent plate on the lamp arm by a toggle linkage between the frame and the arm. The template has a rectangular array of windows and is manually positionable on locating pins at the exposure station for different exposures. A positive image of each window is provided on the template, and the locating pins are movable via movement of the lamp arm from a preview position where the image is at the exposure station so the operator can see where the graphic will be formed to an exposure position with the associated window located at the exposure station for exposure. The template also has a code for each window optically readable by the device so that means in the device will advance the strip material a predetermined distance to provide appropriate spacing between graphics along the strip material.

Apparatus and method of storing and retrieving information

Abstract: Unique identifying symbols, such as bar codes, are preprinted on, or affixed to, each of a plurality of source documents. A scanning and recording device simultaneously reads the identifying symbol appearing on a given source document and records the image thereof on an image storage medium, such as photographic film. Also stored on the image storage medium, adjacent to each image stored thereon, is an address symbol to indicate the relative location at which a desired image is stored. Synchronization means coupled to the scanning and recording device generate an electrical data address word corresponding to this address symbol. This data address word is then combined with a similar data identifying word, generated as the scanning device reads the identifying symbol appearing on each source document, to form a data index word. The data index word is stored in a suitable data storage medium, such as magnetic tape, flexible diskettes, or the like, and is thus available for subsequent retrieval by a data processing system. Retrieval of the information thus stored is accomplished by programming a data processing system to search through the stored data index words to locate and display the address symbol of a desired source document. Once identified, the image of the desired source document is viewed by placing the image storage media, since processed and preserved, on a suitable viewing device that permits selective viewing of the image corresponding to the identified address symbol.

Single sheet color proofing system

Abstract: A presensitized color proofing sheet and method of obtaining an image on one substrate is disclosed herein. The color proofing sheet is comprised of a color layer, a binder layer, both being light sensitive, and non-light sensitive solvent resistant barrier layer with the binder layer being present to provide a means of eliminating residual toning between adjacent layers in the structure.

Sulfonato-organosilanol compounds and aqueous solutions thereof

Abstract: Sulfonato-organosilanol compounds and aqueous solutions and compositions thereof are provided which have at least one sulfonato-organic substituent therein. The weight percentage of oxygen in the compounds is at least about 30% and the weight percentage of silicon in the compounds is not greater than about 15%, these percentages being taken with reference to the water-free acid form of the compounds. Hydrophilic siliceous surfaces and processes for imparting hydrophilicity to such surfaces are also provided.

Method and apparatus for editing digitally recorded audio signals

Abstract: An apparatus for editing digitally recorded audio signals in which entry and exit edit points are designated based on a display of data derived from audio signal data proximate to the edit points. The apparatus enables the automatic selection and combination of portions of audio signals on at last two channels to produce a composite audio signal digitally recorded on a record medium.

Pressure-sensitive tape having a plurality of adhesive layers

Abstract: A pressure-sensitive adhesive tape which not only conforms well and adheres quickly to irregular substrates but also possesses excellent shear adhesion performance. These properties, normally mutually exclusive, are achieved through use of superposed plural pressure-sensitive adhesive strata, the outer stratum being significantly softer than the one lying immediately beneath it.

Flexible magnetic recording media lubricated with fluorinated telechelic polyether polymer

Abstract: Flexible magnetic recording tape is lubricated by a thin coating of a fluorinated telechelic polyether polymer having at least one polar group such as --CONHCH 2 CH 2 OH, --COOCH 3 , --CH 2 OH, and --COCF 3 This is believed to provide for the first time reliably effective lubrication at 40° C and 80% relative humidity

Resin-containing cartridges and process for sealing solid structures or for anchoring bolts and rods therein

Abstract: A cartridge for sealing solid structures or for anchoring bolts or the like therein, having a multicomponent resin system with at least one component (2) in a pressure rupturable container (1), a liquid-permeable mixer matrix (5) at one end of said container, and means (3) for selectively rupturing said container adjacent the mixer matrix, and processes for the use thereof.