Abstract: Disclosed herein a dental mill blank and a method of forming the dental mill blank. The dental mill blank includes a first layer of a first hard restorative material having a first translucency and a first shade, a second layer of a second hard restorative material having a second translucency and a second shade, where at least one of the following is true (1) the first translucency is different from the second translucency, (2) the first shade is different from the second shade. The first layer and the second layer form a first interface having a first curve across a first plane of symmetry of the dental mill blank, where the first curve has a different from zero curvature; and a first straight line along the entire length of a second plane of the dental mill blank, the second plane being orthogonal to the first plane of symmetry.

Abstract: The present disclosure provides for a dental mill blank and a method of forming the dental mill blank. The dental mill blank includes a first layer (102) of a first hard restorative material having a first translucency and a first shade, a second layer (104) of a second hard restorative material having a second translucency and a second shade, where at least one of the following is true: the first translucency is different from the second translucency, the first shade is different from the second shade. The first layer (102) and the second layer (104) form a first interface having a first curve (112) across a first plane of symmetry (114) of the dental mill blank, where the first curve (112) has a different from zero curvature; and a first straight line (122) along the entire length of a second plane (118) of the dental mill blank, the second plane (118) being orthogonal to the first plane of symmetry (114).

Abstract: The invention is a surface modifier for magnetic pigments having the formula:(Ar).sub.n --R--PO.sub.3 H.sub.2 (I)where Ar represents an aryl group, R represents an aliphatic group of 1-6 carbons and n is an integer of 1 or more. The invention also includes magnetic recording media made using such surface modifiers.

Abstract: The invention is a surface modifier for magnetic pigments having the formula:(Ar).sub.n --R--PO.sub.3 H.sub.2 (I)where Ar represents an aryl group, R represents an aliphatic group of 1-6 carbons and n is an integer of 1 or more. The invention also includes magnetic recording media made using such surface modifiers.

Abstract: A magnetic recording medium comprising a substrate having a surface bearing a magnetizable coating wherein said magnetizable coating comprises a magnetic pigment dispersed in a polymeric binder, said polymer binder comprises a star block copolymer having a two phase morphology and comprising a pendant dispersing group.

Abstract: A polymeric binder system useful for a magnetic recording medium, the polymeric binder system and comprising a hard resin component comprising a nonhalogenated vinyl copolymer and a soft resin component comprising a polyurethane having a phosphonate diester group. The binder system is useful for preparing the magnetic layer and/or backside coating of magnetic recording media, in order to provide media that demonstrate an improved combination of such as modulus, Tg, and smoothness.

Abstract: A polymeric binder system useful for a magnetic recording medium, the polymeric binder system and comprising a hard resin component comprising a nonhalogenated vinyl copolymer and a soft resin component comprising a polyurethane having a phosphonate diester group. The binder system is useful for preparing the magnetic layer and/or backside coating of magnetic recording media, in order to provide media that demonstrate an improved combination of such as modulus, Tg, and smoothness.

Abstract: A binder composition suitable for use with magnetic media comprising:(i) a phosphonated polyurethane having a plurality of units of the formula: ##STR1## wherein: the nitrogen atom forms part of the backbone chain of the polymer, andR.sup.1 and R.sup.2 independently represent members selected from the group consisting of alkyl groups of 1 to 5 carbon atoms, cycloalkyl groups and aryl groups of 6 to 10 carbon atoms or together R.sup.1 and R.sup.2 comprise the necessary carbon atoms to complete a ring, and(ii) a vinyl chloride copolymer having pendant ammonium functionalities.

Abstract: Disclosed is a magnetic recording element comprising a support having coated on at least one major surface thereof a layer of a magnetic recording medium and a photosensitive layer which may be separate from or integral with the magnetic recording layer and which contains an infrared absorbing dye or its precursors. Information can be imparted to the photosensitive layer by imagewise exposure to actinic radiation which will either promote or inhibit generation or destruction of the infrared absorbing dye.