Abstract:
Disclosed is a biaxially-oriented polyester film produced from a polyester comprising: (1) diacid residues comprising between about 95 and about 100 mole percent of terephthalic acid residues; (2) diol residues comprising between about 95 and about 100 mole percent of 1,4-cyclohexanedimethanol residues; and (3) about 0.5 to about 5 mole percent of another dicarboxylic acid or diol residue, wherein the polyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues. In one embodiment, the biaxially-oriented film has a thickness of 70 to 150 microns (3-5 mils). In another embodiment, the biaxially-oriented film undergoes not more than 3% shrinkage when immersed for 10 seconds in a solder bath preheated to 260° C. The film can be made by stretching an essentially amorphous cast film of thickness between about 450-1800 micron (18-70 mil) at a ratio from about 2.5×2.5 to 3.5×3.5 while being held at a temperature between 90° C. and 130° C., and heat-setting the stretched film at an actual film temperature of from 260° C. to Tm, where Tm is the melting point of the polyester as measured by differential scanning calorimetry (DSC), while maintaining the dimensions of the stretched film.
Abstract:
An adhesive sheet including a releasable base material, and an adhesive layer formed on one surface of the base material is provided. The adhesive layer includes an adhesive composition including (A) 100 parts by mass of a carboxyl group-containing urethane-modified polyester resin, (B) an epoxy resin, (C) a curing agent, and (D) an inorganic filler, and has a thickness within a range from 40 to 100 μm. The adhesive sheet has a high degree of adhesiveness and excellent anti-migration properties, and is also effective as an interlayer insulating material.
Abstract:
A transparent conductor including a conductive layer coated on a substrate is described. More specifically, the conductive layer comprises a network of nanowires which may be embedded in a matrix. The conductive layer is optically transparent and flexible. It can be coated or laminated onto a variety of substrates, including flexible and rigid substrates.
Abstract:
Disclosed is a biaxially-oriented polyester film produced from a polyester comprising: (1) diacid residues comprising between about 95 and about 100 mole percent of terephthalic acid residues; (2) diol residues comprising between about 95 and about 100 mole percent of 1,4-cyclohexanedimethanol residues; and (3) about 0.5 to about 5 mole percent of another dicarboxylic acid or diol residue, wherein the polyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues. In one embodiment, the biaxially-oriented film has a thickness of 70 to 150 microns (3-5 mils). In another embodiment, the biaxially-oriented film undergoes not more than 3% shrinkage when immersed for 10 seconds in a solder bath preheated to 260° C. The film can be made by stretching an essentially amorphous cast film of thickness between about 450-1800 micron (18-70 mil) at a ratio from about 2.5×2.5 to 3.5×3.5 while being held at a temperature between 90° C. and 130° C., and heat-setting the stretched film at an actual film temperature of from 260° C. to Tm, where Tm is the melting point of the polyester as measured by differential scanning calorimetry (DSC), while maintaining the dimensions of the stretched film.
Abstract:
A flexible metal foil-polyimide laminate is prepared by joining a polyimide film to a metal foil via an intervening adhesive layer. The adhesive is a mixture of polyamic acids: (A) the reaction product of 3,4,3′,4′-biphenyltetracarboxylic anhydride with p-phenylenediamine, (B) the reaction product of 3,4,3′,4′-biphenyltetracarboxylic anhydride with 4,4′-diaminodiphenyl ether, and (C) the reaction product of pyromellitic dianhydride with 4,4′-diaminodiphenyl ether, in a weight ratio (A+B)/C between 75/25 and 25/75. The method is simple and inexpensive, and yields a flexible metal foil-polyimide laminate that is improved in peel strength and curling resistance while maintaining the heat resistance of polyimide.
Abstract:
A base material for a printed circuit board, and a printed circuit board constructed therefrom. The base material is formed from a three-dimensional orthogonally woven fabric having a crimp-free fiber architecture in the x-y plane and an integrated multi-layer structure. The base material comprises a first system of straight first fibers extending along a first direction in a first plane, a second system of straight second fibers extending along a second direction in a second plane parallel to the first plane, and a third system of third fibers extending along a third direction through the first and second systems and binding the first and second fibers thereof. A filler material coats a portion of the first, second and third systems. The printed circuit board comprises the base material and one or more conductive layers attached to surfaces of the base material.
Abstract:
A laminate base material of aromatic polyamide fiber non-woven fabric which comprises a combined non-woven fabric of para-aramid fibers and meta-aramid fibers bonded with each other by a resin binder such as an epoxy resin binder and meta-aramid fibers being thermally adhered to each other and meta-aramid fibers being thermally adhered to para-aramid fibers while they are passing through a pair of thermal rolls and heated and pressed by them and the meta-aramid fibers being included preferably by 5 through 30 weight %.
Abstract:
The invention provides a multilayer microelectronic circuit board including a laminate of a plurality of circuit layers containing conductive vias within the layers or a combination of conductive vias and conductive wiring patterns on a surface of the layers, the layers comprising a first liquid crystal polymer and, interposed between said circuit layers, a layer of second liquid crystal polymer having a melting point of at least about 10.degree. C. lower than the melting point of the first liquid crystal polymer. The boards are produced by stacking a plurality of circuit layer sheets in appropriate electrical alignment such that they are separated by an interposed layer of the second liquid crystal polymer of lower melting point, and heating the stacked polymer sheets under pressure sufficient to bond the sheets or layers into a microelectronic printed circuit board, the temperature of the heating being sufficient to melt the lower melting second polymer but insufficient to melt the polymer present in the circuit layers. The second polymer layer may be interposed as a separate sheet during assembly or may be present as one or two separate surface layers in contact with the higher melting point polymer of the circuit layers.
Abstract:
A polymeric film has a polyester substrate layer and a cross-linked adherent layer of an acrylic resin and a phthalate ester. The adherent layer exhibits improved adhesion to the substrate and to a range of subsequently applied layers, such as inks, lacquers, and vinyl chloride polymers.
Abstract:
A resin composition for forming conductor patterns comprising a photo curable resin, a photopolymerization initiator, a thermosetting resin, agent for the thermosetting resin, photosensitive semiconductor particles, and if necessary a polyfunctional unsaturated compound is suitable for forming very fine conductor patterns in a build-up method.