Readily bondable polyester film

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/36 (2006.01) B41M 5/40 (2006.01) B41M 5/41 (2006.01) B41M 5/44 (2006.01) C08J 5/18 (2006.01) C08J 7/04 (2006.01) C09J 7/02 (2006.01)

Patent

CA 2277489

A readily bondable polyester film which comprises a biaxially oriented polyester film as a base layer and an easily bondable layer, and is useful especially as a substrate for sublimation-type thermal transfer recording materials. This base layer gives a dimensional change curve which, in the range of from the glass transition temperature of the polyester to 240°C, has no point where the slope of the curve changes from positive to negative. The dimensional change of the base layer in that temperature range is not larger than 5%. The readily bondable layer is made of (i) a water-soluble or water-dispersible polyester resin modified with a vinyl resin or (ii) a cross-linked resin made from a mixture of a water-soluble or water-dispersible acrylic resin, a water-soluble or water-dispersible polyester resin, and an epoxy resin cross-linking agent.

La présente invention concerne un film de polyester adhérant facilement comprenant un film de polyester à orientation biaxiale servant de couche de base et une couche adhérant facilement. Ce film convient particulièrement comme substrat pour les supports d'enregistrement par transfert thermique à sublimation. La couche de base donne une courbe de changement de dimensions qui, dans la plage comprise entre la température de transition vitreuse du polyester et 240 DEG C, ne présente aucun point où la pente de la courbe passe de positive à négative. Les changements de dimensions de la couche de base dans cette plage de températures n'excèdent pas 5 %. La couche adhérant facilement est faite (i) d'une résine de polyester hydrosoluble ou hydrodispersable modifiée par une résine de vinyl, ou (II) d'une résine réticulée faire d'un mélange de résine acrylique hydrosoluble ou hydrodispersable et de résine de polyester hydrosoluble ou hydrodispersable, et d'une résine époxy servant d'agent de réticulation.

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