Patent ID: 9701769
Date: 2017-07-11
CPC Classifications: B29C,B29K,C08F,C08L

Claim:
1. A process comprising: thermoforming a propylene polymer wherein the propylene polymer comprises at least one comonomer and at least two propylene polymer fractions of different melt flow index, said propylene polymer being characterized by: wherein the propylene polymer fraction with the lowest melt flow index has a melt flow index ranging from 0.2 dg/min to 1.0 dg/min, determined according to ISO 1133, condition L at 230° C. and 2.16 kg, wherein each of the at least two propylene polymer fractions has substantially the same comonomer content and, relative to the comonomer content of the propylene polymer fraction with the lowest melt flow index, the comonomer content of the other propylene polymer fraction is from 70% to 130%, under the provision that each of the at least two propylene polymer fractions comprises comonomer; and wherein the process is characterized in that a thermoforming window of the process is broadened by at least 0.5° C. as compared to thermoforming a propylene homopolymer with a single propylene homopolymer fraction and thermoformed under the same conditions.