Particular embodiments of the invention include apparatus and methods for compensating for shrinkage of a polymeric material in a mold during curing operations. Embodiments of the method include providing a mold comprising a molding cavity defining an interior mold volume separated from an exterior environment and introducing a volume of polymeric material into the molding cavity. Such methods further include impeding the development of a void in the volume of polymeric material by, either: isolating the volume of polymeric material within the molding cavity from the exterior environment, or reducing the interior mold volume of the molding cavity to at least substantially consume a volume of polymeric material shrinkage. Such methods further include curing the polymeric material to form a molded polymeric form.

The invention relates to a device (1) for supplying at least one molding device (2) with a polymerizable mixture of at least two reactants. According to the invention, said supply device comprises: a buffer tank (10) suitable for receiving said polymerizable mixture via an inlet (101) of said buffer tank, a supply circuit (11), looped with said buffer tank, to convey the polymerizable mixture to an inlet (110) of said at least one molding device and including, beyond said inlet of the molding device, a return pipe (115) connected to the inlet of the buffer tank for sending a portion of the polymerizable mixture from said return pipe, and a filling pipe (42) of said buffer tank, connected to said inlet of said buffer tank, separate from the return pipe, wherein said buffer tank is also suitable for receiving said polymerizable mixture or at least one of said reactants from said filling pipe.

A method for producing an aqueous polyimide precursor solution includes forming a polyamic acid by the reaction of a tetracarboxylic acid component and a diamine component in water without organic solvent together with an imidazole in an amount of 1.6 mole or more per mole of the tetracarboxylic acid component of the polyamic acid.

A curable organopolysiloxane composition containing dynamic covalent organopolysiloxanes which yields, upon cure, a silicone rubber having adaptive elastomeric and viscous characteristics is claimed. The silicone may be an elastomer or foam. A method of making the silicone rubber and a shaped article made of the cured adaptive viscoelastic silicone rubber composition are also claimed.

A cyanoacrylate composition with thermoplastic polyurethane, formulated as a non-flowable soft solid or semi solid mass, for example in stick form, is reported.

A molding method for producing a screw drill stator using an elastomer material includes: S1. sequentially roughening, cleaning and drying an inner surface of the stator tube; mixing an adhesive and a diluent, coating the mixture obtained on the inner surface, and heating it for later use; S2, uniformly coating a mold release agent on a surface of a mandrel mold, and heating or drying it naturally for later use; S3. assembling the processed stator tube and the processed mandrel mold to obtain an assembled mold; S4. performing a vacuum defoaming under negative pressure on a mixture obtained by uniformly mixing a prepolymer of the elastomer material with a defoaming agent; S5. uniformly mixing the defoamed prepolymer of the elastomer material with a curing agent, and pouring the obtained mixture into the assembled mold, sealing and curing the poured assembled mold by hierarchical heating to obtain the stator.

A vehicle display device decorative part and a vehicle display device include a first area provided in the vehicle display device that displays information regarding a vehicle, and having a first pattern formed of a plurality of first grooves, and a second area provided to be included in the first area, and having a second pattern formed of a plurality of second grooves. As a result, the vehicle display device decorative part and the vehicle display device exhibits an effect to realize new and fresh visual effects due to a synergistic effect by a combination of the first pattern formed in the first area and the second pattern formed in the second area included in the first area.

The present system is configured to absorb, using a fluid medium in a reservoir, electromagnetic radiation to heat the fluid medium. The fluid medium may then conduct heat into a mold cavity formed by interior mold surfaces of at least two mold pieces. The fluid medium may heat up to, but not beyond, a phase transition temperature of the fluid medium, reducing instances of accidental damage to moldable material in a mold cavity during thermally-accelerated curing of the moldable material. In some instances a mold may be placed in liquid contained by the reservoir. In some instances, a mold may have integral reservoirs in individual mold pieces.

The present invention relates to an apparatus for dispensing and curing of liquid media, comprising a supply system comprising at least one reservoir for the liquid medium, a nozzle for ejecting the liquid medium into a mould (10) and/or onto a workpiece and means (22) connecting the nozzle and the reservoir; and a microwave system (16,18) which comprises a microwave source (16) for producing microwave radiation for irradiating the liquid medium in an irradiation zone (20) in the supply system, wherein the irradiation zone (20) is arranged between the reservoir and the nozzle. The apparatus further comprises a displacement assembly for translating and/or rotating the nozzle with respect to the mould (10) and/or the workpiece in a controlled manner. According to further aspects, the invention also relates to a system and a method for dispensing and curing of liquid media.

A decorative optical element that has an appearance of a glass optical element includes an optically transparent body having a faceted globular portion defined by a solid volume of polymeric material. A luminaire, such as for a street light, employs the decorative optical element and an LED circuit board mounted to the circuit board.