FILM-FORMING MATERIAL FOR PROTECTING COATING SOLUBLE IN ALKALINE WATER

• Main Authors: SHIMODA EIJI, MINO YASUTAKE, SAITO KOICHI
• Format: Patent
• Language: English
• Published: 09.03.1993
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS THEREFOR; WOODSTAINS

PURPOSE:To provide a film-forming material for a protective coating soluble in alkaline water, composed of a copolymer containing specific structural units, exhibiting excellent dryability in coating, having high coating film strength to enable the protection of a material from dust and acid rain and removable with alkaline water. CONSTITUTION:The objective film-forming material for a protective coating soluble in alkaline water is composed of a copolymer having a number-average molecular weight of 7,000-25,000 and produced by copolymerizing (A) preferably 65-93wt.% of an alpha,beta-unsaturated monoethylenic monomer (preferably n-butyl acrylate or methyl methacrylate), (B) preferably 7-20wt.% of an alpha,beta-- monoethylenic unsaturated carboxylic acid monomer [preferably (meth)acrylic acid] and preferably 0.2-15wt.% of an amphiphatic monomer such as diacetone acrylamide of formula I, N,N-dimethylacrylamide of formula II and acryloyl morpholine of formula III. The film-forming material is neutralized to pH of >=6 with ammonia, triethylamine, etc., before use.