Shape-memory laminated polybutylene terephthalate film,...

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B32B 27/36 (2006.01) B29C 47/06 (2006.01) B29C 47/88 (2006.01) B29C 47/92 (2006.01) B29C 55/28 (2006.01) B29C 61/06 (2006.01) B32B 37/20 (2006.01) B29C 35/16 (2006.01) B29C 47/00 (2006.01) B29C 47/90 (2006.01)

Patent

CA 2499491

A laminated polybutylene terephthalate film having an excellent shape memory and high dimensional stability under heat, which is obtained by (1) bonding a polybutylene terephthalate film to another film or a laminated film and forming the obtained laminate at a temperature (T1) not higher than the glass transition temperature of the polybutylene terephthalate while keeping it in the first shape, (2) forming the obtained shaped laminate into the second shape at a temperature (T2) exceeding the above glass transition temperature, and (3) cooling the obtained shaped laminate to a temperature (T3) not higher than the above glass transition temperature.

L'invention porte sur un film laminé de téréphtalate de polybutylène présentant une excellente mémoire de forme et une grande stabilité dimensionnelle à chaud, et qu'on obtient de la manière suivante: (1) fixation d'un film de téréphtalate de polybutylène à un autre film ou à un film laminé et soumission du produit ainsi obtenu à une température (T1) ne dépassant pas la température de transition vitreuse du téréphtalate de polybutylène, tout en lui imprimant une première forme; (2) soumission du produit obtenu en (1) à une température (T2) dépassant la température de transition vitreuse du téréphtalate de polybutylène, tout en lui imprimant une deuxième forme; et (3) refroidissement du produit obtenu en (2) à une température (T3) ne dépassant pas la température de transition vitreuse du téréphtalate de polybutylène.

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