Patent ID: 7855263

Claim:
A process for obtaining thermoformed articles comprising: forming a sheet comprising a propylene resin; and thermoforming the sheet; wherein the propylene resin comprises: (i) from 10 to 100% by weight of a propylene homopolymer or a propylene copolymer comprising from 0.1% to 10% by mol of derived units of ethylene or an alpha-olefin of formula CH 2 ═CHZ, wherein Z is a linear or branched C 2 -C 20 radical; and (ii) from 0 to 90% by weight of a propylene copolymer comprising from 0.1% to 10% by mol of derived units of ethylene or an alpha-olefin of formula CH 2 ═CHZ, wherein Z is a linear or branched C 2 -C 20 radical, and the propylene copolymer comprises a content of ethylene or an alpha-olefin of formula CH 2 ═CHZ different from the propylene copolymer (i); the propylene resin further comprising: a distribution of molecular weight Mw/Mn lower than 4; 2,1 insertions lower than 0.50% measured by 13 C—NMR; eta* and frequency ω meet the following relation for ω comprised between 0.1 and 1 (ISO 6721-10 carried out at 200° C.); eta*>3700ω (−0.13) ; and a melt flow rate (MFR) (ISO 1133) lower than 5, wherein the propylene resin is obtained by contacting: a) a metallocene compound of formula (I): wherein M is a transition metal belonging to group 3, 4, 5, 6 or to the lanthanide or actinide groups in the Periodic Table of the Elements; X, same or different, is a hydrogen atom, a halogen atom, or a R, OR, OSO 2 CF 3 , OCOR, SR, NR 2 or PR 2 group, wherein R is a are linear or branched, cyclic or acyclic, C 1 -C 40 -alkyl, C 2 -C 40 alkenyl, C 2 -C 40 alkynyl, C 6 -C 40 -aryl, C 7 -C 40 -alkylaryl or C 7 -C 40 -arylalkyl radicals; optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements; or two X can optionally form a substituted or unsubstituted butadienyl radical or a OR′O group wherein R′ is a divalent radical selected from C 1 -C 40 alkylidene, C 6 -C 40 arylidene, C 7 -C 40 alkylarylidene and C 7 -C 40 arylalkylidene radicals; L is a divalent C 1 -C 40 hydrocarbon radical optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements or a divalent silylidene radical containing up to 5 silicon atom; R 1 and R 5 are a C 1 -C 40 hydrocarbon radical optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements; R 2 , R 3 and R 4 , equal to or different from each other, are hydrogen atoms or C 1 -C 40 hydrocarbon radicals optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements; R 6 , R 7 , R 8 , R 9 , and R 10 equal to or different from each other, are hydrogen atoms or C 1 -C 40 hydrocarbon radicals optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements, with the proviso that at least one among R 6 , R 7 , R 8 , R 9 , and R 10 is different from an hydrogen atom; b) at least an alumoxane or a compound that forms an alkylmetallocene cation; and c) optionally an organo aluminum compound.