Polypropylene resin compositions, coating process for...

C - Chemistry – Metallurgy – 08 – L

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C08L 23/12 (2006.01) B05D 3/06 (2006.01) B05D 3/14 (2006.01) B05D 7/02 (2006.01) C08L 23/10 (2006.01) C08L 23/14 (2006.01) C08L 23/16 (2006.01) C08L 29/02 (2006.01) B05D 3/00 (2006.01)

Patent

CA 2086420

A process for coating a molded article of a polypropylene resin composition comprising polypropylene (A), a specified ethylene/propylene/diene terpolymer rubber (B), a specified ethylene/propylene copolymer rubber (C) and a specified polyhydroxypolyolefin (D), each in an amount satisfying the following relations: 10 < (B) + (C)/(A) + (B) + (C) ~ 60 (wt %), 1 ~ (C)/(B) + (C) ~ 50 (wt %); 0.5 ~ (D)/(A) + (B) + (C) + (D) ~ 10 (wt %) without the necessity for cleaning with an organohalogen solvent, which process comprises conducting priming or plasma treatment followed by topcoating. The molded article thus coated has a tightly adhered coating, a good gasohol resistance and an excellent appearance.

Procédé pour enrober un article moulé constitué d'une composition en résine de polypropylène comprenant du polypropylène (A), un caoutchouc terpolymère éthylène/propylène/diène (B), un caoutchouc copolymère éthylène/propylène (C) et une polyoléfine de polyhydroxy (D), dans une quantité respective satisfaisant aux relations ci-après: 10 (B) + (C)/(A) + (B) + (C) 60 (% en poids), 1 (C)/(B) + (C) 50 (% en poids), 0,5 (D)/(A) + (B) + (C) + (D) 10 (% en poids). Ce procédé ne nécessite pas de nettoyage avec un solvant organohalogéné et consiste à effectuer un traîtement de fond ou au plasma suivi d'une enduction de surface. L'article moulé ainsi enduit présente un revêtement dont l'adhérence est excellente, une bonne résistance à l'essence-alcool ainsi qu'un excellent aspect.

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