Powder coatings

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 175/16 (2006.01) C08G 18/32 (2006.01) C08G 18/34 (2006.01) C08G 18/67 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2594978

The invention relates to low baking temperature ultraviolet (UV) radiation curable or thermally curable powder coating polymer materials and compositions for heat-sensitive and/or flexible substrates. More specifically, such powder coating polymer materials and compositions are based on crystalline or semi- crystalline polymers but when subject to melting and flow-out at low temperatures (6O~C - 14O~C) and upon curing in molten state by UV radiation or thermal energy, will give a (highly) flexible coating having either complete amorphous, non-crystalline, low glass transition temperature (T9) polymeric matrix or low degree of crystallinity, low T9 polymeric matrix.

L~invention concerne des matériaux polymères et compositions pour revêtement en poudre durcissables sous l~effet de la chaleur ou d~un rayonnement ultraviolet (UV) à faible température de cuisson, destinés à des substrats sensibles à la chaleur et/ou souples. Plus spécifiquement, de tels matériaux polymères et compositions pour revêtement en poudre sont à base de polymères cristallins ou semi-cristallins mais, lorsqu~on les fait fondre et s~écouler à basse température (60 °C à 140 °C) et qu~on les durcit à l~état fondu à l~aide d~un rayonnement UV ou d~énergie thermique, ils produiront un revêtement (très) souple ayant une matrice polymère totalement amorphe, non cristalline et à faible température de transition vitreuse (T9), ou bien une matrice polymère à faible degré de cristallinité et de T9.

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