Abstract: Disclosed is a method of encapsulating integrated circuit chips formed on an insulating substrate which permits complete filling of areas under the chip. The encapsulant employed is a dispersion of a material, such as a silicone elastomer, which cures by reaction with water vapor. Subsequent to application of the encapsulant over and under the chip, the solvent of the dispersion is evaporated during a pre-cure treatment by means of a dry ambient of less than 5% relative humidity which suppresses crosslinking. After essentially all the solvent is thus removed, the encapsulant is cured by exposure to a second ambient of higher relative humidity which enhances crosslinking.

Abstract: Infusible and insoluble styrene copolymeric fibers are prepared by copolymerizing styrene with an olefinic compound having at least one functional group selected from haloalkyl group, amino group, carboxyl group, carbonic acid ester group, carbonic acid halide group, hydroxyl group, amido group, nitrile group and halogen atom, melt spinning the resulting styrene copolymer into fibers and treating the formed fibers with a cross-linking agent to form three dimensional cross-linkages in the fibers.

Abstract: A tapered synthetic resin pipe can be produced by winding belt-like or thread-like glass fiber around a tapered core bar, inserting it into a tapered mold and thereafter pulling out only the core bar, pouring a thermosetting synthetic resin in liquid form into the mold, inclining the mold by a predetermined angle from the horizontal position and rotating it at a predetermined rate of rotation.

Abstract: A method of forming a polymer laminate which comprises mixing an unsaturated polyester resin with allyl melamine monomer; molding the mixture under heat and pressure to cause the allyl melamine to cross link the polyester chains and thereby produce a substrate; applying a melamine-formaldehyde glaze material to one face of the substrate; and heating the glazed substrate to effect polymerization and adherence of the glaze material on the substrate surface. The use of allyl melamine as the cross linking agent for the polyester prevents the glaze from cracking, blistering or peeling when subjected to heat, attack from household chemicals, or abrasion forces.

Abstract: An improvement in a process for producing a synthetic resin cast article having an abrasion-resistant polymer surface layer integrated with the polymer body is provided. The improvement is characterized in that the abrasion-resistant polymer surface layer is formed by a two step polymerization procedure; in the first polymerization step, the polymerizable material is covered with a covering body such as a polymer film, closely adhered thereto, and in the second polymerization step, the polymerizable material is exposed to the air.

Abstract: A process for molding a tire having a wide bearing surface comprising the steps of molding reinforcing shoulders in a static mold and partially curing the molded materials; removing the partially cured shoulders from the static mold and placing them in a rotating mold; introducing additional plastic material into the rotating mold and rotating the mold; and then heating the mold to complete the curing of the shoulders and to fully cure the additional plastic material to form the tire casing.

Abstract: A vulcanizing agent for rubber is incorporated into a polymer which is substantially noncrosslinkable by the agent but which is fusible with rubber upon milling. The resulting polymeric mixture and a vulcanizable rubber are formed into strips which are joined together along the lengths thereof to form an elongated, two-component tape wherein the rubber vulcanizing agent is carried in the nonreactive polymer. Sections of the tape can be milled to produce a vulcanizable compound by blending the polymeric component with the rubber component, thus obviating any need for separate addition of a rubber vulcanizing agent. The tape can be wound on a reel and stored until the need for blending arises. Premature reaction of the vulcanizing agent with the rubber is prevented since it is bound within the noncrosslinkable polymer.

Abstract: Method of making a reinforced pneumatic tire in which the tire body is formed in at least two sections each including a side wall and a plurality of annular bands each including an annular reinforcing belt embedded in an elastomer. The tire sections are assembled in a mold with the annular bands of each section interleaved with the annular bands of another section and the elastomer is cured to form an integral tire body. The tire may be formed of two reinforced sections with the interleaved bands forming the annular tread section of the tires, or as three reinforced sections, including two sections each including a side wall and annular bands and a connecting section including annular bands with reinforcing belts which are interleaved with the annular bands of the other two sections to form a tread section. An annular, elastomeric tread section may be formed separately and bonded around and to the annular bands of the reinforced sections.

Abstract: A method for molding a reinforced composite plastic structure to provide a roughened bondable surface over a portion thereof during the forming operation and which method includes molding a resin-filled, fiberglass-reinforced composite against a mold member having an elastomeric insert in the face thereof such that a portion of the fiberglass fibers are imbedded in the elastomeric member during molding so as to prevent encapsulation of the imbedded fibers by the resin and thereby leaving a roughened or three-dimensional surface over that area of the composite covered by the elastomeric mold inset.

Abstract: A batch process for vulcanizing, without the use of a lead press, reinforced elastomeric hose built up on a solid mandrel, preferably a flexible mandrel of rubber or thermoplastic material, is disclosed. In the preferred embodiment of the process, the uncured hose is first annularly tightly clamped at its opposite ends and is then immersed in a bath of liquid, e.g. water, sufficient to cover the hose substantially completely. The entire assembly is then subjected in a pressurized heating environment, e.g. in a steam-filled vulcanizer or autoclave, to the action of fluid pressure against the outer hose surface and the pressure due to the thermal expansion of the mandrel against the inner hose surface. The clamping of the hose ends prevents entry of fluid pressure into the space between any two proximate layers of elastomeric material occupied by a layer of the filamentary reinforcement.

Abstract: A process for producing melt-spun and cured phenolic filaments having improved tenacity and whiteness which comprises treating cured phenolic filaments with an alcohol having 1 to 6 carbon atoms or acetone and reacting the thus-treated phenolic filaments with an esterifying solution containing acetic anhydride in the presence of an inorganic acid of phosphorus as an esterifying catalyst.

Abstract: A method is disclosed for fabricating in a single stage hollow polymeric article of manufacture from a flexible fibrous material, regardless of the degree of complexity of the laminate. The material is applied to a hollow flexible envelope which includes a pattern of any degree of complexity and which is supported on a solid mandrel, to be encased in a two-part female die. The envelope and applied material are sealed off from the mandrel by means of film layers forming a bag. A vacuum is established within the bag, resulting in forces acting from the inner side of the envelope through it and the laminated material against the die walls. The support mandrel is removed, and the remaining assembly is cured under the vacuum with or without elevated pressures. After cooling, the die and envelope are readily removed from the article.

Abstract: A process for free sintering parts made from mixtures of poly(phenylene sulfide) and at least one selected filler by subjecting molded parts to gradually increasing temperatures and then curing at an elevated temperature. Precured poly(phenylene sulfide) is first mixed with the selected filler and then compression molded to form a part of a desired shape. The part is then free sintered by being subjected to a gradually increasing temperature in an oven and cured. After curing, the part is cooled and is ready for use.

Abstract: A process for producing a drawn or undrawn flame-resistant and anti-fusing cured phenolic continuous filament which comprises melt-spining an uncured novolak resin which may contain a fiber-forming thermoplastic synthetic resin and then curing the melt-spun filament with a curing agent in the presence of a catalyst; characterized by pre-curing the melt-spun filament with an aldehyde as a curing agent in the presence of an acid catalyst, and then curing the pre-cured filament with an aldehyde in the presence of a basic catalyst.