| 摘要 |
A composition containing (1) a crystalline polypropylene resin and (2) one or more beta-nucleating agents of the formula (I), wherein R<SUB>1</SUB>, R<SUB>2 </SUB>and R<SUB>3</SUB>, independently of one another, are C<SUB>1</SUB>-C<SUB>20</SUB>alkyl, C<SUB>2</SUB>-Calkyl substituted by C<SUB>1</SUB>-C<SUB>10</SUB>alkylamino, di(C<SUB>1</SUB>-C<SUB>10</SUB>alkyl)amino, C<SUB>1</SUB>-C<SUB>10</SUB>alkyloxy or hydroxy; C<SUB>3</SUB>-C<SUB>20</SUB>alkenyl, C<SUB>5</SUB>-C<SUB>12</SUB>cycloalkyl, C<SUB>5</SUB>-C<SUB>12</SUB>Cycloalkyl substituted by 1, 2 or 3 C<SUB>1</SUB>-C<SUB>10</SUB>alkyl; cyclohexylmethyl; cyclohexylmethyl substituted by 1, 2 or 3 C<SUB>1</SUB>-C<SUB>10</SUB>alkyl; C<SUB>5</SUB>-C<SUB>9</SUB>cycloalkenyl, C<SUB>5</SUB>-C<SUB>9</SUB>cycloalkenyl substituted by 1, 2 or 3 C<SUB>1</SUB>-C<SUB>10</SUB>alkyl; phenyl substituted by 1, 2 or 3 radicals selected from the group consisting of C<SUB>1</SUB>-C<SUB>10</SUB>-oalkyl, C<SUB>1</SUB>-C<SUB>10</SUB>alkyloxy, hydroxy, halogen, trihalogenmethyl, trihalogenmethoxy, benzoyl, phenylamino, acylamino and phenylazo; C<SUB>7</SUB>-C<SUB>9</SUB>phenylalkyl, C<SUB>7</SUB>-C<SUB>9</SUB>phenylalkyl which is substituted on the phenyl by 1, 2 or 3 radicals selected from the group consisting of C<SUB>1</SUB>-C<SUB>10</SUB>alkyl, C<SUB>1</SUB>-C<SUB>10</SUB>alkoxy and hydroxy; naphthyl, naphthyl substituted by C<SUB>1</SUB>C<SUB>10</SUB>alkyl, adamantyl, or a 5 to 6 membered heterocyclic group; characterized in that the polypropylene resin has a content of beta-form crystals of at least 10% calculated by means of the following equation beta-form crystal content (%)=100xP<SUB>beta1</SUB>,/(P<SUB>a1</SUB>+P<SUB>a2</SUB>+P<SUB>a3</SUB>+P<SUB>beta1</SUB>) where P<SUB>a1 </SUB>to P<SUB>a3 </SUB>are respective peak heights (maxima) of the a-form and P<SUB>beta1 </SUB>is a peak height (maximum) of the beta-form determined by wide angle X-ray scattering.
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