3M

About: 3M is a company organization based out in Saint Paul, Minnesota, United States. It is known for research contribution in the topics: Layer (electronics) & Coating. The organization has 7603 authors who have published 7907 publications receiving 254227 citations. The organization is also known as: Minnesota Mining and Manufacturing Company & 3M Company.

Photocurable ionomer cement systems

Abstract: A dental cement system containing a photocurable ionomer, reactive powder and water undergoes both a conventional setting reaction and a photocuring reaction. The cement system can provide a long working time and can be cured on demand by exposure to an appropriate source of radiant energy. The surface of the cement cured in this manner is then hard enough to allow subsequent clinical procedures to be performed, while the ongoing chemical-cure "setting" reaction hardens the remainder of the cement.

Method of planarizing the upper surface of a semiconductor wafer

Abstract: This invention pertains to a method of modifying or refining a surface of a wafer suited for semiconductor fabrication. This method may be used to modify a wafer having an unmodified, exposed surface comprised of a layer of a second material deployed over at least one discrete feature of a first material attached to the wafer. A first step of this method comprises contacting and relatively moving the exposed surface of the wafer with respect to an abrasive article, wherein the abrasive article comprises an exposed surface of a plurality of three-dimensional abrasive composites comprising a plurality of abrasive particles fixed and dispersed in a binder and maintaining contact to effect removal of the second material. In a second step, the contact and relative motion are continued until an exposed surface of the wafer has at least one area of exposed first material and at least one area of exposed second material.

Drag reduction article

Abstract: A conformable drag reduction article is provided having a patterned surface capable of reducing drag resistance by fluid flowing thereover.

Energy polymerizable compositions containing organometallic initiators

Abstract: An energy polymerizable composition and process therefore, comprising a cationically polymerizable material and a catalytically effective amount of an ionic salt of an organometallic complex cation as polymerization initiator, said ionic salt of an organometallic complex cation being capable of adding an intermediate strength nucleophile or upon photolysis capable of liberating at least one coordination site, said metal in said organometallic complex cation being selected from elements of Periodic Groups IVB, VB, VIB, VIIB, and VIIIB are disclosed. Certain of the organometallic metallic polymerization initiators are novel cationic salts.

Ultra-flexible retroreflective cube corner composite sheetings and methods of manufacture

Abstract: A method for manufacturing flexible cube corner retroreflective sheeting comprising the steps of: a) providing a tool having a molding surface; b) applying to the molding surface a volume of a lowable resin composition; c) contacting the resin composition with a first major surface of an overlay film; d) minimizing excess resin composition; e) curing the resin composition to form a sheeting comprising an array of cube corner elements bonded to the overlay film; f) removing the sheeting from the tool; and g) applyingmechanical stress to the sheeting so as to cause a fractured separation of substantially each individual cube corner element from surrounding cube corner elements. Also, flexible retroreflective sheetings comprising: a) a two-dimensional array of substantially independent cube corner elements, the array comprising a first polymetric material, and b) an overlay film having two major surfaces and comprising a second polymeric material, the array being bonded to the first major surface of the overlay film. Also safety devices incorporating such sheetings.