Base coated with a linear thermoplastic polyether

Abstract

Abstract Coating, adhesive and moulding compositions comprise a substantially linear polyether condensation product, prepared by the process of the parent Specification, and having a weight average molecular weight of at least 50,000, together with a polyfunctional modifying agent capable of reacting with the oliphatic hydroxyl groups in the linear polyether condensation product. Suitable reactive modifiers are aminoplasts, phenoplasts, polyisocyanates, organic or inorganic acid anhydrides, e.g. phosphorus pentamide or trimellitic anhydride, diepoxides, together with conventional catalysts. Non-reactive modifying agents, e.g. solvents, polyalkylene glycols; or conventional plasticizers such as dillalphthalate, dioctyl sebacate, dibutylphthalate, butylbenzylphthalate, polyvinyl formals, polyesters, chlorinated biphenyls, hydrogenated rosins, rosin esters, triaryl or trialkyl phosphates; dyes; pigments; fillers, and ultra-violet screening agents may be included in the compositions. In the examples, the resin used was prepared by reacting equivalents of p,p1-bisphenol A and its diglycidyl ether in methyl ethyl ketone with caustic soda as catalyst. The resin is used as a solution in a mixture of solvents, using as modifiers: (Examples 2-7) a urea-formaldehyde polyether resin; (Examples 8-10) a commercial methylol phenol polyether resin known as "Methylon"; (Example 12) melamine-formaldehyde resin; (Examples 13, 14) urea-formaldehyde resin; (Example 15) trimellitic anhydride; (Example 16) phosphorus pentoxide; (Example 17) a mixture of 2,4- and 2,6-toluene diisocyanate. Specification 730,760 also is referred to.ALSO:Coating compositions containing linear polyether resins as claimed in the parent Specification and cross-linking agents therefor may be applied to a variety of bases or substrates, e.g. steel, brass, aluminium, tin plate, wood, glass, ceramics and synthetic resins, e.g. epoxy, acrylic, and vinyl resins, e.g. as bases for coatings of other resins or as primers for paints. The compositions are particularly suitable for can coatings. The coatings may be applied by the "fluidized bed" technique to an article heated above the melting point of the resin, or the powdered resin may be sprayed on to a preheated substrate, or applied by flame technique or by electrostatic deposition. An article may be dipped into a batch of molten resin composition. Alternatively solutions or emulsions of the compositions may be applied by any conventional method; or the resins may be applied as plastisols or organosols. The coatings may then be air dried and baked. Specification 730,670 also is referred to.

Inventors

• 👤 Clifford D Marshall
• 👤 Peter B Kelly

Bibliographic Details