Patent ID: 7423088

Claim:
A composition containing (1) a crystalline polypropylene resin and (2) one or more β-nucleating agents of the formula (I), wherein R 1 , R 2 and R 3 , independently of one another, are C 1 -C 20 alkyl, C 2 -C 20 alkyl substituted by C 1 -C 10 alkylamino, di(C 1 -C 10 alkyl)amino, C 1 -C 10 alkyloxy or hydroxy; C 3 -C 20 alkenyl, C 5 -C 12 cycloalkyl, C 5 -C 12 cycloalkyl substituted by 1, 2 or 3 C 1 -C 10 alkyl; cyclohexylmethyl; cyclohexylmethyl substituted by 1, 2 or 3 C 1 -C 10 alkyl; C 5 -C 9 cycloalkenyl, C 5 -C 9 cycloalkenyl substituted by 1, 2 or 3 C 1 -C 10 alkyl; phenyl substituted by 1, 2 or 3 radicals selected from the group consisting of C 1 -C 10 alkyl, C 1 -C 10 alkyloxy, hydroxy, halogen, trihalogenmethyl, trihalogenmethoxy, benzoyl, phenylamino, acylamino and phenylazo; C 7 -C 9 phenylalkyl, C 7 -C 9 phenylalkyl which is substituted on the phenyl by 1, 2 or 3 radicals selected from the group consisting of C 1 -C 10 alkyl, C 1 -C 10 alkoxy and hydroxy; naphthyl, naphthyl substituted by C 1 -C 10 alkyl, adamantyl, or a 5 to 6 membered heterocyclic group; characterized in that the polypropylene resin has a content of β-form crystals of at least 10% calculated by means of the following equation β-form crystal content (%)=100 ×P β1 /( P α1 +P α2 +P α3 +P β1 ) where P α1 to P α3 are respective peak heights (maxima) of the α-form and P β1 is a peak height (maximum) of the β-form determined by wide angle X-ray scattering.