Oriented polypropylene films for adhesive tape

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 7/02 (2006.01) B32B 27/32 (2006.01) C08J 5/18 (2006.01)

Patent

CA 2348012

An adhesive tape (10) comprising a backing (11) and a layer of adhesive (18) on the backing. The backing comprises a biaxially oriented substrate which comprises an isotactic polypropylene composition. The tapes and backings of this invention can be severed readily using commercial tape dispensers having metal or plastic cutting teeth to produce cleanly serrated cut edges on the tape. The biaxially oriented substrate is preferably made from a resin comprising an isotactic polypropylene homopolymer having a melt flow rate greater than 8 grams/10 minutes, more preferably greater than 12 grams/10 minutes, and still more preferably greater than about 20 grams/10 minutes. One preferred way to obtain such a resin is to blend: A) at least one isotactic polypropylene homopolymer "A" having a weight average molecular weight of at least 350,000 grams/mole and melt a flow rate of about 0.5-8 grams/10 minutes, more preferably about 0.5-5 grams/10 minutes; with B) at least one isotactic polypropylene homopolymer "B" having a weight average molecular weight of at least 100,000 grams/mole and a melt flow rate greater than 8 grams/10 minutes, and preferably greater than about 20 grams/10 minutes, and more preferably greater than about 50 grams/10 minutes.

L'invention se rapporte à un ruban adhésif (10) comportant un support (11) recouvert d'une couche d'adhésif (18). Ledit support comporte un substrat à orientation biaxiale qui comporte une composition de polypropylène isostatique. Les rubans et les supports de cette invention peuvent être facilement coupés au moyen de distributeurs de ruban du commerce qui sont pourvus de dents coupantes en matière plastique ou en métal qui permettent de former des bords dentés, coupés correctement, sur le ruban. Le substrat à orientation biaxiale est de préférence constitué d'une résine comportant un homopolymère de polypropylène isostatique présentant un coefficient d'écoulement à l'état fondu supérieur à 8 grammes/10 minutes, de préférence supérieur à 12 grammes/10 minutes, et idéalement supérieur à 20 grammes/10 minutes. De préférence, on produit cette résine en mélangeant (A) au moins un homopolymère de polypropylène isostatique "A" ayant un poids moléculaire moyen d'au moins 350 000 grammes/mole et un coefficient d'écoulement à l'état fondu compris entre 0,5 et 8 grammes/10 minutes, de préférence compris entre 0,5 et 5 grammes/10 minutes, et (B) au moins un homopolymère de polypropylène isostatique "B" ayant un poids moléculaire moyen d'au moins 100 000 grammes/mole et un coefficient d'écoulement à l'état fondu compris supérieur à 8 grammes/10 minutes, de préférence supérieur à 20 grammes/10 minutes et idéalement supérieur à 50 grammes/10 minutes.

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