摘要:
@ A solvent-resistant barrier coating is used beneath a polyurethane top coat, for example for coating aircraft. The barrier coating comprises a film-forming addition polymer comprising units of a vinyl aromatic monomer and units of a monomer containing a hydroxy alkyl group and a polyisocyanate containing at least 2 isocyanate groups per mote- cule. The addition polymer has a hydroxyl content in the range 0.5 to 5 per cent by weight due to the presence of the hydroxy alkyl groups and preferably contains at least 30 per cent by weight of the vinyl aromatic monomer. The ratio of isocyanate groups to hydroxyl groups is in the range 1:1 to 2:1. The polyurethane top coat can be removed from the substrate by a stripping solvent such as methylene chloride without removing the barrier coating.
摘要:
A light-reflective flowable and curable composition comprises a resin containing light-reflective solid particles in an amount and of average particle size sufficient to provide the desired light reflectance/transmittance characteristics to the cured composition. Preferably, the composition is self-levelling and the solid particles comprise magnesium oxide, barium sulphate, aluminium oxide or mixtures thereof. The compositions of the invention are useful as reflective coatings in various applications, such as for radiation detector devices including scintillator crystals. For instance, a scintillator crystal block (1), mounted on a base (4) within a housing (7), has channels or grooves (3) separating it into elements (2) and these are optically isolated from one another by means of the light-reflective curable composition.
摘要:
A flame sprayable powder composition suitable for coating a plastic substrate comprising by weight (a) about 90 to 98% of a flame sprayable mineral powder, (b) about 1 to 5% of a nylon powder, and (c) about 1 to 5% of an epoxy resin powder. The coated plastic may thereafter be overcoated by flame spraying with conventional metal or ceramic powders. The undercoat results in a good bond to the substrate.
摘要:
A transparent coating composition for substrates, in particular glass, is described comprising a film former and an ultraviolet absorber capable of absorbing light having a wavelength of not more than 380 nm. Furthermore a process for adhering a curable composition to a substrate, particularly to glass, is described, using said UV-absorbing coating composition as a primer and applying on top of it a curable composition. (Fig. 1).
摘要:
A foundation composition useful in making-up a mannequin, comprising a polymeric film-forming material, a water-insoluble white powder material, the particles of which have an average size of from 2 to 100 microns and the content of which is in a range of from 20 to 60% based on the entire weight of the composition, and water.
摘要:
A paint for outdoor surfaces and surfaces in wet rooms, especially for concrete walls exposed to strong weathering, contains pigment, binder of which a part is (meth)acrylic polymers and/or copolymers, volatile solvent(s), fillers and optionally known additives and it is characterized by (a) having a pigment-volume concentration of 47 to 65%, preferably 55 to 60%, (b) containing diatom shells as a part of the filler, and (c) containing one or more oligomeric alkyl-alkoxy-organosiloxanes as part of the continuous binder phase. There is obtained on one hand a high degree of imperviousness to water in the liquid form and on the other hand a high degree of diffusion of aqueous vapour.