Abstract: Unique phase morphologies of incompatible thermoplastic polymers, including a higher melting temperature polymer and a lower melting temperature polymer that has been sufficiently chemically compatibilized to form a stable interface in a two-phase system, are achieved by pre-melting the higher melting temperature polymer, adding the compatibilized lower melting temperature polymer in solid form thereto, and thereafter melting the lower temperature polymer with mixing. In particular, in poly(ethylene vinyl alcohol)/modified polyolefin systems, compositions containing between about 35 and about 55 wt. percent EVOH are formed in which the poly(ethylene vinyl alcohol) exists as a continuous phase and the modified polyolefin exists as discrete domains dispersed therein. Such blended compositions have gas barrier properties comparable to homogeneous poly(ethylene vinyl alcohol).

Abstract: Trialkylgallium is purified of group II B p-type impurities, particularly Zn, Hg, and Cd, by contacting the trialkylgallium with a metallic gallium-containing melt. Also, trialkylgallium can be produced by contacting a dialkyl group II B compound with a metallic gallium-containing melt.

Abstract: A waterborne paint for traffic marking contains as an emulsion binder, a support polymer formed of styrene and acrylic acid monomers and having an acid value of between about 50 and about 250 and a hydrophobic emulsion polymer comprised of acrylic ester monomers and optionally including styrene monomers. The support polymer, in aqueous ammonia solution, acts as a surfactant, maintaining the emulsion polymer within micelles. Paints in accordance with the invention contain between about 10 and about 15 wt. percent of the emulsion polymer, between about 60 and about 75 wt. percent fillers or pigments and between about 9 and about 18 wt. percent water. Due to the high solids loading and low water content, the waterborne traffic marking paint is fast drying. Colored paints prefereably utilize banded pigments.

Abstract: A photoimageable composition contains from 0.5 to 5 wt. percent of a compound of the formula: ##STR1## wherein R=alkyl, aryl, aralkyl, alkenyl, alkynyl, and substituted forms thereofX=OR', SR', NR'.sub.2, R'R'=H, R, CO--R,G=nothing or C.sub.1 -C.sub.8 alipathic hydrocarbon, andY=COOH, PO.sub.3 H, SO.sub.3 H, SO.sub.2 H and SOH. X'=R'to promote adhesion of the photoimageable composition to metal.

Abstract: A tag is added to an asphalt additive, typically an anti-stripping agent. The additive dye is mixed with other components of an asphalt composition and melt processed at 300.degree. F. (149.degree. C.) or above to produce an asphalt composition. Presence of the tag to identify presence of the additive is performed by dissolving the asphalt portion of the composition in a water-immiscible solvent and then extracting the tag in an acidic aqueous solution and developing a color with a diazo compound.

Abstract: Electro-deposition-coated steel is top coated with a flexible coating formed of a polyester having --OH functionality, a polyacrylate having --OH functionality and melamine-formaldehyde resin to provide substantially a stoichiometric amount of reactive sites relative to the total amount of --OH functionality of the polyester and the polyacrylate. The flexible coatings exhibit superior chip and scratch resistance relative to rigid coatings of the type conventionally used in the automotive industry.

Abstract: In a dry film laminate useful in the printed circuit industry comprising a support sheet, a photoimageable composition layer and a protective sheet, a dual intermediate layer is interposed between the photoimageable composition layer and the support sheet. The intermediate layer consists of a water-soluble tie coat in contact with the photoimageable composition layer and a top coat in contact with the support sheet, the top coat being insoluble in neutral or acidic aqueous solution but soluble in dilute alkaline aqueous solution.

Abstract: Liquid petroleum products are marked with markers having the formula: ##STR1## where the Ws are selected from O--(C.sub.1 -C.sub.3 alkyl) and hydrogen, provided that at least one W is O--(C.sub.1 -C.sub.3 alkyl), the Xs and Ys are the same or different and are selected form hydrogen, alkyl, substituted alkyl, alkenyl, substituted alkenyl, aryl, substituted aryl, fused aryl, substituted fused aryl, halogen, nitro, cyano, and alkoxy.

Abstract: Solid solutions comprise a water-soluble thermoplastic resin and a microbicide dissolved therein. These solutions may be added to a rigid thermoplastic resin composition to impart biocidal characteristics thereto. If the microbicide is water-insoluble, the solid solutions may be used to prepare stable dispersions of the microbicide. The solutions also provide for slow release of a microbicide or as a vehicle for providing microbicide to an aqueous solution.

Abstract: A photoimageable composition for forming a solder mask has a photopolymerizable acrylate chemical system which renders exposed portions insolvable to alkaline aqueous developers and an epoxy chemical system which hardens the composition after exposure and development. The acrylate chemical system comprises acrylate monomers, epoxy-acrylate oligomers and a photoinitiator. The epoxy chemical system comprises an epoxy resin and a curative therefore. The composition further comprises a cross-linking agent which is reactive with hydroxyl groups of the acrylate and epoxy chemical systems.

Abstract: A positive photoresist of the type containing an alkali-soluble novolac resin and a quinone diazide sensitizer contains a dye of the general formula: ##STR1## wherein R' is lower alkyl, R" is H, alkyl or CO.sub.2 -alkyl, alkyl-CO.sub.2 -alkyl or alkyl-CO.sub.2 -(C.sub.1 -C.sub.3 alkyl-O).sub.n -alkyl (n=1-3) and wherein said dye is compatible with the novolac resin/quinone diazide formulation to at least 0.1 phr. The dye reduces reflective notching. Preferably the photoresist also contain a nitro naphthol dye to reduce the effects of I-Line radiation.

Abstract: A dry film for forming a solder mask includes a cover sheet, a photoimageable composition layer which is curable to form a solder mask and a top coat interposed between the cover sheet and the photoimageable composition layer which is selectively adherent to the photoimageable composition layer. The dry film is applied to a surface of a printed circuit board with a minor portion of the area of the photoimageable composition layer tacked to the printed circuit board. The cover sheet is peeled away. With heat and vacuum, the photoimageable composition layer is laminated to the irregular surface of the printed circuit board, conforming the photoimageable composition layer to the contours thereof and leaving the top coat as a protective covering over the photoimageable composition layer. The photoimageable composition layer is exposed to patterned actinic radiation, developed and cured to form a hard, permanent solder mask.

Abstract: A powder coating composition forming a textured finish comprises epoxy resin, methylene disalicylic acid and an imidazole Bisphenol A epoxy resin.

Abstract: A polysulphide resin composition is cured by reacting a liquid polysulphide resin with an isocyanate curing agent in the presence of an organometallic or metal salt catalyst, preferably an organotin catalyst such as dibutyltin laurate (DBTL). The compositions have utility in thin films and coatings, and in the bonding, sealing and coating of polycarbonates. Aliphatic isocyanates are preferred for applications where clear coatings are required, the more reactive aromatic isocyanates being preferred for other applications.

Abstract: Liquid petroleum products are tagged with a marker which is a compound or mixture of compounds having the formula: ##STR1## wherein R.sup.1 is C.sub.1 -C.sub.6 alkyl, and R.sup.2 and R.sup.3 are nothing or --O--(C.sub.1 -C.sub.3 alkyl).

Abstract: A flake-containing coating powder is obtained by admixing a coating powder that based upon a thermosetting resin and metallic or non-metalic flake. The powder and flake are mixed at a temperature in the range of above the softening temperature of the thermosetting resin of the coating powder but below the melting temperature of the thermosetting resin and with sufficient mechanical shear to prevent agglomeration of the coating powder particulates. Mixing is for a time sufficient to embed at least about 75% by weight of the flake into the coating powder.

Abstract: The invention provides novel acrylic resins particularly useful for formulating polyvinylidene fluoride/thermosetting acrylic polymer coating compositions. The acrylic polymer is comprised of (a) acrylic acids and acrylic esters having no additional functionality, (b) acrylic acids and acrylic esters having additional functionality by which the acrylic polymer may be cross-linked, and (c) an acryloxyalkyl oxizolidine.

Abstract: Improved sodium borohydride powder compositions have a silica-based anticaking agent. In a method wherein a mixture of sodium borohydride and an anti-caking agent are compacted under pressure, the process is improved, particularly in speed, by the use of a silica-based anti-caking agent.

Abstract: Electro-deposition-coated steel is top coated with a flexible coating formed of a polyester having -OH functionality, a polyacrylate having -OH functionality and melamine-formaldehyde resin to provide substantially a stoichiometric amount of reactive sites relative to the total amount of -OH functionality of the polyester and the polyacrylate. The flexible coatings exhibit superior chip and scratch resistance relative to rigid coatings of the type conventionally used in the automotive industry.

Abstract: A sodium borohydride/sodium hydroxide solution for dithionite generation contains sufficient levels of diethylene triamine pentaacetic acid to chelate metals in the dithionate generation process and also in a pulp bleaching process.