Abstract:
In the art of electroplating nonconductive materials, adhesion of metal to the material is enhanced by incorporating into the material from 1 to 25 percent by weight of a metal resinate. Crystalline polyolefins, such as polyethylene, polypropylene and propylene-ethylene copolymer, are modified with calcium resinate, zinc resinate, aluminum resinate, sodium resinate, potassium resinate or ammonium resinate to improve the adhesion of metal thereto.
Abstract:
A PROCESS OF MELTALLIZING MOLDED POLYOLEFIN ARTICLES, ESPECIALLY THOSE MADE OF POLYPROPYLENE, WHEREIN THE ARTICLE IS PRETREATED WITH A CONDITIONER COMPRISING A KETONE WHICH IS CAPABLE OF PENETRATING THE SURFACE OF THE POLYOLEFIN ARTICLE AND WHICH IS DISPERSIBLE, EMULSIFIABLE OR AT LEAST SLIGHTLY SOLUBLE IN WATER. ACETONE AND METHYL ETHYL KETONE ARE PARTICULARLY USEFUL KETONES FOR USE AS THE POLYOLEFIN PRECONDITIONER.
Abstract:
A non-destructive test is provided for determining the ability of a metal coating to adhere to the plastic substrate of a metallized plastic article comprising determining the difference between two separate contact angle values, the first being obtained by measuring the contact angle formed by a drop of liquid resting on a specimen plastic substrate prior to etching said substrate and the second being obtained by measuring the contact angle formed by a drop of liquid resting on an etched plastic substrate. Contact angle values are easily measurable parameters which indicate platability and therefore are valuable in the electroplating of plastics.
Abstract:
In the art of treating plastic surfaces to improve the adhesion of paints or metals thereto wherein the surface is treated with a strong mineral acid solution containing hexavalent chromium, the adhesion is improved by adding to the acid solution from 0.1 to 6 percent by volume of a petroleum fraction boiling between 80* C. and 240* C. which is rich in branched chain aliphatic hydrocarbons and alicyclic hydrocarbons, olefins containing a neopentyl group, or carboxylic acids containing a neopentyl group.
Abstract:
Metallizable polyolefin compositions are provided by incorporating into a polyolefin from about 1 percent to about 50 percent by weight, based on the weight of the polyolefin, of a finely-divided talc having a platey (micaceous) or massive (granular) particle shape and having an average particle size of from about 0.4 microns to about 40 microns. The aforementioned talc filled polyolefin compositions may be metallized by electroplating or other metallizing processes to form metallized shaped articles.
Abstract:
A PROCESS FOR REARRANGING THE PARTICLE SIZE DISTRIBUTION OF FINELY DIVIDED SOLID ALPHA MONOOLEFIN POLYMERS COMPRISING HEATING A SLURRY OF POLYMER WET CAKE AND WATER TO A TEMPERATURE IN THE RANGE OF 35*-150* C. IN A CLOSED AUTOCLAVE FOR THE TIME NECESSARY TO PRECONDITION THE POLYMER AND THEREAFTER SHOCK COOLING THE HEATED SLURRY TO PROVIDE A POLYMER POWDER HAVING A CHANGED PARTICLE SIZE DISTRIBUTION IN THE RANGE OF 70 TO 250 MICRONS.