In a first aspect, a single layer polymer film includes 60 to 99 wt % of a crosslinked polyimide, having a gel fraction in the range of from 20 to 100% and a refractive index of 1.74 or less, and 1 to 40 wt % of a colorant. A surface of the single layer polymer film has been textured and has a maximum roughness (S.sub.pv) of 6 μm or more, an L* color of 30 or less and a 60° gloss of 15 or less. In a second aspect, a coverlay for a printed circuit board includes the single layer polymer film of the first aspect. In third and fourth aspects, processes are disclosed for forming a single layer polymer film including a crosslinked polyimide film including a dianhydride and a diamine.

Described herein are physically crosslinked, closed cell continuous multilayer foam structures that includes a foam layer comprising polypropylene, polyethylene, or a combination of polypropylene and polyethylene and a polyamide cap layer. The multilayer foam structure can be obtained by coextruding a multilayer structure comprising at least one foam composition layer and at least one cap composition layer, irradiating the coextruded structure with ionizing radiation, and continuously foaming the irradiated structure.

A polymer for organic ferroelectric materials and an organic ferroelectric materials are disclosed. The polymer is a (meth)acrylic polymer, wherein the polymer comprises one or more (meth)acrylates as main monomer units and one or more (meth)acrylic monomers other than the main monomer units, wherein the main monomer units are (meth)acrylate monomer units having in the side chain thereof a saturated or unsaturated hydrocarbon skeleton linked to the distal end of the oxycarbonyl group, wherein the hydrocarbon skeleton has a hydrogen atom on the β-carbon atom relative to the oxycarbonyl group, and one or more electron withdrawing groups selected from halogen atom, cyano group, oxo group, and nitro group, that bind to the β-carbon atom and/or to one or more carbon atoms distal thereto, substituting for hydrogen atoms thereon, wherein the proportion of the main monomer units is less than 80 mol % of the total (meth)acrylic monomer units.

Zwitterionic double network hydrogels, methods for making zwitterionic double network hydrogels, methods for using zwitterionic double network hydrogels, and articles made from and coated with zwitterionic double network hydrogels.

A thermally conductive sheet in which a cured layer of a thermally conductive silicone composition is laminated on one or both sides of a synthetic resin film layer of aromatic polyimide, etc. having excellent heat resistance, electrical insulation, and mechanical strength, wherein good thermal conductivity, good insulation, and strong interlayer adhesion are provided because the thermally conductive silicone composition includes 250 to 600 wt. % of an aspherical thermally conductive filler material, which contains no more than 80 ml/100 g of a DOP oil absorption amount and an organic silicon compound component including an adhesion imparting agent, relative to 100 wt. % of the organic silicon compound component, and moreover the thermally conductive sheet with no brittleness during use can be made using continuous molding.

A polyimide resin including a structural unit A derived from a tetracarboxylic dianhydride and a structural unit B derived from a diamine compound, wherein the structural unit A includes a structural unit (A-1) derived from a compound represented by the following formula (a-1), and the structural unit B includes a structural unit (B-1) derived from a compound represented by the following formula (b-1): ##STR00001## wherein m and n in the formula (b-1) each independently are an integer of 0 or 1.

A modified copolymer is provided. The modified copolymer includes a random copolymer of a repeat unit of formula (I) and a repeat unit of formula (II) ##STR00001##
wherein M is derived from monomers with double bonds, R is a direct bond or an aliphatic hydrocarbon chain group having 1 to 12 carbon atoms, a cyclic aliphatic hydrocarbon group having 3 to 16 carbon atoms, an alkylcarbonyloxy group having 2 to 6 carbon atoms, a carbonyl group, an ether group, an ester group, an amide group, an aromatic group having 6 to 16 carbon atoms, or a divalent group having any of the above groups, wherein m and x are positive integers less than 50. The weight average molecular weight of the modified copolymer is between 3000 and 30000.

A foamed, opacifying element has a substrate with opposing planar surfaces and a foamed opacifying layer disposed on one opposing surface. The foamed opacifying layer contains (a) 0.1-80 weight % of nonporous polymeric particles; (b) 10-80 weight % of a matrix material derived from a (b) binder material having a glass transition temperature of less than 40 C.; (c) 0.0001-50 weight % of certain additives; (d) less than 5 weight % of water; and (e) at least 0.002 weight % of an opacifying colorant different from all of the (c) additives. Foamable and foamed aqueous compositions can be used to provide these foamed, opacifying elements for use as light-blocking window shades, curtains, or other materials. These light-blocking articles can also have a printable outer surface that accepts ink for making printed images that are not observable from the opposite surface.

A process of preparing carbon fiber reinforced polymer (CFRP) intermediate products is described wherein the carbon fibers are prepared from a carbon fiber precursor and then in-line impregnated with a polymeric resin as part of a continuous process. The process can provide cost savings compared to processes wherein carbon fibers are prepared and then impregnated with polymeric resins in a separate process, thereby making the use of CFRP materials more economically feasible. Also described is a system for preparing carbon fiber from a carbon fiber precursor and impregnating the carbon fiber with polymeric resin to provide CFRP intermediate products, such as continuous tapes or rods or discontinuous flakes or pellets.

A light control film to be bonded to a panel member for a vehicle includes film substrates, conductive layers, and a liquid crystal layer. The conductive layers are on surfaces of the film substrates opposed to each other, respectively. The liquid crystal layer is sandwiched between conductive layers. The light control film is switchable between a first state with a first haze percentage and a second state with a second haze percentage that is lower than the first haze percentage. Each film substrate includes at least an acrylic imide layer made of acrylic imide. Each conductive layer includes a thin silver film or a copper wire mesh.