摘要:
The process for modifying the surface of a filler or reinforcing material comprising contacting said surface with a bicyclic amide acetal at a temperature in the range of from about 60.degree. C. to about 350.degree. C. is described.
摘要:
Fast curing adhesives which are free of solvent and have high heat resistant bonding strength composed of mixtures of polyols, polyepoxides and polyisocyanates are described.
摘要:
Fast curing adhesives which are free of solvent and have high heat resistant bonding strength composed of mixtures of polyols, polyepoxides and polyisocyanates are described.
摘要:
A process is described for the manufacture of aryl esters such as phenyl esters by liquid phase reaction of an aromatic compound such as benzene with molecular oxygen in the presence of a perfluorocarboxylic acid and carboxylic acid preferably having 5 or more carbon atoms over a catalyst composed essentially of a compound of palladium, an antimony compound and optionally a compound of at least one member selected from the group consisting of chromium, cobalt, nickel, manganese, iron and tin wherein the aromatic compound is added continuously to the reaction and water formed in the reaction is rapidly and continuously removed from the reaction mixture.
摘要:
A process is described for the manufacture of aryl esters such as phenyl esters by liquid phase reaction of an aromatic compound such as benzene with molecular oxygen in the presence of a carboxylic acid preferably having 6 or more carbon atoms over a catalyst composed essentially of a compound of palladium and an antimony compound wherein the aromatic compound is added continuously to the reaction and water formed in the reaction is rapidly and continuously removed from the reaction zone.
摘要:
A method for production of simultaneous lap and butt joints directs electromagnetic radiation (12) through a radiation transmitting material (40) to an absorbing material (44a, 44b, and 44c) that absorbs radiation (12) with the generation of heat. The heat provides sufficient molten material in interfaces (50a, 50b, and 50c) to fuse and bond: 1) pipe ends (14, 24) to each other in a butt joint (22), 2) pipe end portion (16) to sleeve (40) in a lap joint (28a), and 3) pipe end portion (26) to sleeve (40) in a lap joint (28b). Use of a sufficiently clear material for sleeve (40) allows visual inspection of joints (22, 28a, and 28b). Butt joint (22) can be formed by conductive heating without absorbing material (44a) to provide a smooth interior bore useful for transporting high purity fluids without risk of absorbent contamination or debris and organism collection in gaps found in previous joining techniques.
摘要:
Induction heating of thermoplastic composite materials is accomplished to form a continuous bonded joint. A zone of optimum heating can be created by an induction heating coil mounted within and adjacent to the drum of a hollow circular roller of non-conductive material (i.e., transparent to the RF field) so that an induction heating field can be created and localized to create a zone of optimum heating at the joint area of the material to be bonded. Simultaneously pressure to that area can be applied by the circular roller. In a preferred form, the roller is semi-rigid to permit spreading of the contact surface with the joint area to avoid absolute contact line loading. A hand held induction heating unit with a finger operable power switch can be moved in a back and forth manner over the joint to apply heat when the switch is turned on and effect consolidation when the switch is turned off. Using the techniques of the invention, one can fuse two contacting members which are comprised of filamentary reinforced composite materials in which the matrix resin at the joint interface is a member of the thermoplastic family of polymers. The invention concentrates radio frequency (RF) energy at the joint interface which heats the surrounding layers and simultaneously provides for the application of a controlled force normal to the mid-plane of the joint to retain compaction of the laminates which would normally be relieved in a hot unrestrained condition.
摘要:
A vapor phase process for the direct oxidation of a methyl benzene to the corresponding aldehyde derivative; e.g., conversion of toluene to benzaldehyde, wherein said oxidation is effected in the presence of a catalyst system consisting essentially of uranium and molybdenum oxides in combination with an oxide of lead, tin, zirconium, cadmium, antimony or nickel.
摘要:
The present invention relates to a method of welding pre-formed toothbrush heads and handles using about 0.7 to about 2.0 micrometers, or about 4.0 to about 6.0 micrometers, wavelength laser beam.
摘要:
A plastic joining method directs polychromate, non-coherent electromagnetic radiation through a transmitting plastic to an absorbing material that absorbs the radiation with the generation of heat. The heat is used to heat a bond line formed from the transmitting plastic and a substrate sufficiently to bond the transmitting plastic and substrate. A radiation filter of the same material as the transmitting plastic is used to reduce effectively unwanted absorption (and heat) in the transmitting plastic. Radiation focusing, masking, transmitting plastic cooling, bond line component drying, double pass welding, and additional bond line pressure are used to improve the bond of the resulting manufacture.