Forming two clear polyurethane or isocyanate crosslinked coats on a substrate

The coatings comprise a hydroxyl-containing base resin and a polyisocyanate crosslinking agent. The coatings are cured (or polymerised) by heating (140 {C for 30 minutes). The first clear coating has a glass transition temperature (Tg) <70{C and the second coating has Tg / 70 {C. The first film h...

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Bibliographic Details
Main Authors KOKI CHIGA, HIDEO SUGAI, TOORU FUKUDA, TOSHIAKI NAGANO
Format Patent
LanguageEnglish
Published 24.09.2008
Subjects
ADHESIVES
APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
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 OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
ORGANIC MACROMOLECULAR COMPOUNDS
PAINTS
PASTES OR SOLIDS FOR COLOURING OR PRINTING
PERFORMING OPERATIONS
POLISHES
PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL
SPRAYING OR ATOMISING IN GENERAL
THEIR PREPARATION OR CHEMICAL WORKING-UP
TRANSPORTING
USE OF MATERIALS THEREFOR
WOODSTAINS
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Summary:The coatings comprise a hydroxyl-containing base resin and a polyisocyanate crosslinking agent. The coatings are cured (or polymerised) by heating (140 {C for 30 minutes). The first clear coating has a glass transition temperature (Tg) <70{C and the second coating has Tg / 70 {C. The first film has tan w (loss elastic modulus/storage elastic modulus at 80 {C) <0.4. The base resin in the first layer is preferably acrylic or polyester. The coatings are applied to metallic car panels.
Bibliography:Application Number: GB20080004447