Radiation curable compositions for additive fabrication are described and claimed. Such compositions are particularly suited for investment casting applications, and include a cationically polymerizable component, a radically polymerizable component, a certain type of prescribed antimony-free, sulfonium salt-based cationic photoinitiator, and a free-radical photoinitiator. In other embodiments, the composition may also include a photosensitizer and/or a UV/absorber. Also described and claimed is a method for using a liquid radiation curable resin for additive fabrication with a certain type of prescribed antimony-free, sulfonium salt-based cationic photoinitiator and a certain type of prescribed photosensitizer in an investment casting process.

There is provided a resin composition for a modeling material, used for shaping a modeling material by a manufacturing method for light curing molding using an ink-jet scheme, comprising (A) an ethylenic unsaturated monomer as a photocuring component, (B) a photopolymerization initiator, and (C) a surface adjusting agent, wherein the resin composition for a modeling material has surface tension Mt of 26.0 to 33.0 mN/m, and the resin composition for a modeling material has surface tension Mst represented by the following (i) expression of 33.0 mN/m or more, and this resin composition for a modeling material 4a can afford a light cured article having the good dimensional accuracy.

A multilayer film having Machine Direction Orientation (MDO) is prepared by first co-extruding a multilayer film, then stretching the multilayer film in the machine direction at a temperature lower than the melting point of the polyethylene resin that is used to prepare the film. At least one layer of the film is a first polyethylene composition having a density of from about 0.94 to about 0.97 g/cc and at least one second layer is prepared from a polyethylene composition having a lower density than the first polyethylene composition. This disclosure enables the manufacture of films having outstanding barrier properties (low Water Vapor Transmission Rate, WVTR, and low Oxygen Transmission Rate, OTR) and good physical properties.

A process for producing a polyurethane or polyisocyanurate construction board, the process comprising (i) providing an A-side reactant stream that includes an isocyanate-containing compound; (ii) providing a B-side reactant stream that includes a polyol and a physical blowing agent, where the physical blowing agent includes pentane, butane, and optionally a blowing agent additive that has a Hansen Solubility Parameter (δ.sub.t) that is greater than 17 MPa.sup.−0.5; and (iii) mixing the A-side reactant stream with the B-side reactant stream to produce a reaction mixture.

In a first aspect, the present invention relates to a process improvement additive suitable for polymer processing, wherein this process improvement additive comprises a carrier polymer, a binding component and one or more fluoropolymers and wherein this process improvement additive further comprises one or more zeolites. In a second aspect, the present invention relates to a method for processing a polymer, wherein a process improvement additive is added to the polymer prior to processing and wherein this process improvement additive comprises a carrier polymer, a binding component, one or more fluoropolymers and one or more zeolites.

A composite article comprises an article presenting a surface and a thermally expandable composition disposed on the surface of the article. The thermally expandable composition comprises (a) from about 35 to about 65 percent by weight of a polyolefin resin; (b) from about 2 to about 15 percent by weight of a thermoplastic resin; (c) from about 1 to about 6 percent by weight of a curing agent suitable for cross-linking the polyolefin resin (a); (d) from about 15 to about 45 percent by weight of filler; and (e) from about 1 to about 10 percent by weight of a chemical blowing agent which is activated at an activation temperature, each based on the total weight of the thermally expandable composition. Methods of preparing and using the composite article, and an assembly formed from the composite article, are also disclosed.

A polystyrene (PS) composition for making an extruded foam, the PS composition comprising polystyrene, a blowing agent, and an additive selected from glycerol monostearate (GMS), glycerol tri-stearate (GTS), mineral oil (MO), epoxidized soy oil (ESO), epoxidized polybutadiene, or combinations thereof. Methods of producing a low density polystyrene (PS) foam are also provided.

In an injection foam molding method, a relationship between a flow front moving speed (cm/s) of a foamed resin material in an injection step of injecting the foamed resin material into a cavity and amount of gas generated per 1 g of a resin material (ml/g) is defined as follows: the amount of gas generated per 1 g of the resin material is 0.36 ml/g or more; and the flow front moving speed (cm/s) is 75×the amount of gas generated per 1 g of the resin material (ml/g)−35 or more and 12 cm/s or more.

A method of producing a test body for diffusion tensor imaging, which comprises a plurality of channels in a structuring material, the channels preferably having a maximum cross-section of 625 μm.sup.2, wherein a virtual model of the test body is created and the virtual model is fed to a structuring device which produces the test body by means of a 3D printing-based, in particular lithography-based, structuring process, the structuring process being designed as a multiphoton lithography process, in particular as a multiphoton absorption process, in which the structuring material containing a photosensitizer or photoinitiator is irradiated in a location-selective manner, wherein the radiation is successively focused on focal points lying within the structuring material, resulting in that in each case a volume element of the material located in the focal point is subjected to a change in state by means of a photochemical reaction as a result of multiphoton absorption.

Process for producing a polymer composition, a polymer composition obtainable by said process and the use of said polymer composition as adhesive polymer composition and for the production of a multilayer structure, such as a three-layer metal pipe coating, with improved peel strength.