Polyolefin sheets for thermoforming

Details Polyolefin sheets for thermoforming Polyolefin sheets for thermoforming

C - Chemistry, Metallurgy

08

J

C08J 5/18 (2006.01) B29C 51/00 (2006.01) C08F 10/06 (2006.01) C08F 210/06 (2006.01) C08F 210/16 (2006.01) C08F 297/08 (2006.01) C08L 23/14 (2006.01) C08L 23/16 (2006.01)

Patent

CA 2406611

Polypropylene sheet for thermoforming wherein at least one layer comprises a propylene polymer containing at least 0.8 % by weight of ethylene and optionally one or more C~4-C~10 .alpha.-olefins, or a propylene polymer composition containing at least 0.8 % by weight of one or more comonomers selected from ethylene and C~4-C~10 .alpha.-olefins, and having the following features: 1) a melting temperature of 155 ~C or higher; 2) a content of fraction soluble in xylene at room temperature lower than 4 % by weight, and a value of the ratio of the polymer fraction collected at the temperature range from 25 ~C to 95 ~C to the said xylene soluble fraction higher than 8.

L'invention concerne une feuille de polypropyl­ne destin~e ~ Útre thermoform~e dans laquelle au moins une couche comprend un polym­re de propyl­ne contenant au moins 0,8 % en poids d'~thyl­ne et, ~ventuellement, une ou plusieurs .alpha.-ol~fines en C´4?-C´10?, ou une composition de polym­re de propyl­ne contenant au moins 0,8 % en poids d'un ou plusieurs comonom­res choisis parmi l'~thyl­ne et plusieurs .alpha.-ol~fines en C´4?-C´10?, et poss~dant les caract~ristiques suivantes: 1) une temp~rature de fusion de 155 ~C ou plus; 2) une teneur en fraction soluble dans le xyl­ne ~ temp~rature ambiante inf~rieure ~ 4 % en poids, et une valeur de rapport entre la fraction de polym­re collect~e dans l'intervalle de temp~rature de 25 ~C ~ 95 ~C et la fraction soluble dans le xyl­ne, sup~rieure ~ 8.

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