摘要:
A flame retardant epoxy molding compound comprises an epoxy, a hardener preferably of the novolac or anhydride type, a catalyst, a mold release agent, preferably a filler, preferably a colorant, preferably a coupling agent, an organic compound containing a halogen (which can be part of the resin or the hardener), and an oxidizing refractory metal oxide, preferably an oxidizing metal oxide of an element selected from the Group VIA of the Periodic Table. The flame retardant epoxy molding compounds when used to encapsulate semiconductor devices have synergistic flame retardant properties.
摘要:
Battery separators are provided for maintenance-free lead-acid batteries. From 10 to 90 percent by weight of the fiber content of the battery separator is comprised of a non-metallic acicular mineral, wollastonite, that is substantially less expensive than the microglass fibers used heretofore yet provides comparable, and even superior results with respect to electrolyte absorption and retention characteristics of the battery separator material. The microglass fibers used heretofore also are used in the battery separator of the present invention together with a minor amount, 5-15 percent, of synthetic binder fiber.
摘要:
A thin film printed board precursor containing a laminate of a dielectric thermosetting resin film layer (6) and a heat and electrically conductive metal foil layer (5) in direct adhesive bonding with a side of the resin film (6), optionally containing a supporting layer (22) comprising one or more of fiber, fabric and thermoplastic polymer in contact with the other side of the resin layer (6), wherein the dielectric thermosetting resin layer (6) has an unimpeded thickness that is at least equal to that of the foil layer (5) bonded to it.
摘要:
A heat seal infusion packing material for such articles as tea bags and the like includes multicomponent thermoplastic fibers as a significant portion of the heat seal fibers. The multicomponent heat seal fibers provide improved seal strength and infusion characteristics over a broad operational window while reducing the heat seal fiber concentration within the sheet material.
摘要:
Wet-laid nonwoven webs having mechanical reinforcement properties are provided by employing unpulped vegetable fiber bundles as the predominant fiber component. The unpulped fiber bundles have a modulus of elasticity of about 2 - 5 x 106 psi and a chopped fiber length of about 25 mm. The fibers are cordage fibers including sisal, abaca, henequen, kenaf and jute. Composites of the unpulped fiber webs with cellulosic and spunbonded sheets find application as thermoformed vehicle interior trim products.
摘要:
A mechanically debossed foil (21) with a circuit pattern is laminated to a thin isotropic uncured and ungelled thermosetting resin film (11). The process comprises debossing a metal foil using a shaping tool with a surface possessing an embossed circuitry pattern, as described in the prior art. The foil (21) is separated from the tool. The separated metal foil (21) is placed in contact with the resin film (11) and forced into the film without significantly altering the foil shape. An optional support layer (18) may be bonded to the film.
摘要:
A thin thermosetting resin film that is amenable to being subjected to a debossing procedure that debosses a grooved printed circuit pattern thereon with minimal loss of debossment precision of the grooved pattern, which pattern and the grooving can be cured to produce a thermoset resin film that can be employed for eventually generating a printed board. The thermosetting resin film has the following qualities: a) it is designed for shaping by processes such as stamping, compression molding, transfer molding, injection molding, and the like without the need for constraining flow at the edges of the resin film; b) the resin is nonconductive, i.e., the resin can be used as a dielectric substrate; c) it is a thin film that is sufficiently uniform in thickness in order to provide consistent heat shaping capability across the breadth of the film, and the thickness should be sufficient to accept the shape imposed by the shaping process; d) the film possesses low flow over a broad temperature range so that it does not flow uncontrollably while undergoing cure conditions, and when placed under pressure, only the portions that are superimposed over a groove or cavity in the case of a female mold, or over a protuberance in the case of a male mold, will be caused to flow because of pressure imposed on the film; and e) the film gels or achieves properties similar to a state of gelation, over conditions leading to cure, that satisfy commercial conditions.