Abstract: This invention involves a prepreg composition and procedure for use in forming printed circuit boards with reduced and uniform dielectric constant, improved thermal expansion characteristics, and uniform appearance. The prepreg composite is a resin impregnated substrate and has a reduced dielectric constant as low as 3.5. It contains 5-30% by resin volume of hollow inorganic microsphere filler whose diameters are less than 40 micrometers, and the uniform distribution of the hollow inorganic microspheres is controlled by the presence of hydrophobic fumed silica or other similar flow modifier.

Abstract: An improved laminating machine having a supply of laminating material guided into the machine so a pair of webs respectively are fed through heating stations and then extend parallel to one another along a workpiece path in a direction towards a drive station. A supply of sheet material is delivered between the webs of laminating material. A pair of pressing rolls supported for rotation engage and bond together opposite sides of the heated laminating material and the sheet material to form a composite workpiece. Each heating station directs laminating material to the pressing rolls. Each heating station is formed in an arcuate configuration and includes a plurality of rollers and a plurality of heaters. Each heater is operatively connected with a respective roller. A pair of rotatable cooling rollers are supported along the path between the pressing rolls and the drive station. Each cooling roller has at least one coolant passage extending longitudinally therethrough.

Abstract: An unsaturated polyester resin characterized by high performance electrical, physical and mechanical properties and useful in the electronic and microwave industries, and a process for preparing such a resin.

Abstract: Metal foil laminates of an unsaturated polyester resin, MC4, characterized by high performance electrical, physical and mechanical properties and useful for electronic circuit boards, low impedence microwave boards and E.M.I.-R.F.I. shielding, and a process for preparing such a metal-clad laminate.

Abstract: An unsaturated polyester resin characterized by high performance electrical, physical and mechanical properties and useful in the electronic and microwave industries, and a process for preparing such a resin.

Abstract: A surface laminate film ideally suited for application by lamination onto a substrate such as wall covering and a process for laminating said surface laminate film onto said paper substrate is disclosed. The surface laminate film comprises a polyvinylchloride film plasticized with a polymeric plasticizer and combined with an acrylic adhesive. The adhesive should most ideally be an acrylic adhesive.

Abstract: A metal foil laminate including at least one sheet of metal foil directly bonded to one face of a sheet of glass fiber reinforced polyester and epoxy resin, and a continuous process for preparing such laminates including post curing partially cured product by radio-frequency electromagnetic energy.

Abstract: A tamper proof identification card. The disclosed card is made from a core of safety paper sandwiched between two top and bottom layers of polyester coated with polyethylene. The safety paper is bounded at its periphery by a polyester border similar to the top and bottom layers. The layered card is heat and pressure treated to encapsulate the paper. Should the seal be inadequate, any attempts to modify the information marked on the safety paper will be readily apparent.

Abstract: A label structure wherein indicia marked therein by application of localized pressure are relatively permanent and are not generally altered by sunlight, water, temperature changes, mechanical handling, chemicals which do not attack the label structure, etc. The label structure comprises a panel member and fastening means with the panel member characteristically being formed by at least two flattened members, one of which is an oriented thermoplastic sheet or film.

Abstract: An assembly for a container having a plurality of panels each of which is engaged at marginal edges thereof by a channel shaped rail. Moldings formed with pairs of spaced parallel flanges define recesses for receiving the rails.

Abstract: A portable wet bar having a removable top which exposes counter space beneath the top. The counter space includes a sink with a source of water and a drain, an ice bucket, and a cutting board. Beneath the counter top are a refrigerator, a water container and a waste receptacle. A single pipe goes to the faucet within the sink and the automatic ice-maker within the refrigerator.