Injection moulding articles made of metallocene polypropylene
AssigneeBasell Polyolefine GmbH
InventorsJohn Russell Grasmeder, Klaus Overthun
Life of this patent
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Abstract
Homopolymers of propylene or copolymers of propylene with C214 C10-alk-1-enes, which polymers are obtainable by polymerization of the corresponding monomers using metallocene catalysts are used for producing moldings such as injection-molded articles.
Claims6
Injection-molded CD packaging or injection-molded CD-ROM packaging comprising an essentially isotactic homopolymer of propylene or a copolymer of propylene with C2-C10-alk-1-enes, which polymer is obtained by polymerization of the corresponding monomers using metallocene catalysts, wherein the homopolymer of propylene has
- (1) a Melt Flow Rate of 40-80 g/10 min. (measured at 230° C. with a load of 2.16 kg in accordance with DIN 53735);
- (2) a molecular weight distribution of 1.2 to 2.5 (Mw/Mn);
- (3) a melting point of 140-165° C. (DSC);
- (4) a pentad content mmmm of 80% to 98% (determined by 13C-NMR);
- (5) a xylene-soluble content of less than 1% by weight;
- (6) an E modulus of 1500 to 7000 (measured in a tensile test by ISO 527);
- and
- (7) a haze of less than 8% (determined by ASTMD 1003), and
- wherein the copolymer of propylene has
- (1) a Melt Flow Rate of 40-80 g/10 min.;
- (2) a melting point of 100° to 150° C. (DSC);
- (3) a Mw/Mn ratio of 1.2 to 2.5;
- (4) a xylene-soluble content of less than 1% by weight;
- (5) a chemically bound proportion of comonomer in the range of 0.01 to 15 mol %;
- (6) an E modulus, measured in a tensile test, in the range of from 1500 to 7500 (tensile test in accordance with ISO 527);
- and
- (7) haze of less than 8% (determined in accordance with ASTM D 1003).
A process for preparing CD packaging or CD-ROM packaging wherein propylene or a monomer mixture of propylene and at least one further C2-C10-alk-1-ene is polymerized by metallocene catalysts and the resulting essentially isotactic homopolymer of propylene or copolymer of propylene with C2-C10-alk-1-enes is injection molded to said CD packaging or CD-ROM packaging, wherein the homopolymer of propylene has
- (1) a Melt Flow Rate of 40-80 g/10 min. (measured at 230° C. with a load of 2.16 kg in accordance with DIN 53735);
- (2) a molecular weight distribution of 1.2 to 2.5 (Mw/Mn);
- (3) a melting point of 140-165° C. (DSC);
- (4) a pentad content mmmm of 80% to 98% (determined by 13C-NMR);
- (5) a xylene-soluble content of less than 1% by weight;
- (6) an E modulus of 1500 to 7000 (measured in a tensile test by ISO 527);
- and
- (7) a haze of less than 8% (determined by ASTMD 1003),
- and wherein the copolymer of propylene has
- (1) a Melt Flow Rate of 40-80 g/10 min.;
- (2) a melting point of 100° to 150° C. (DSC);
- (3) a Mw/Mn ratio of 1.2 to 2.5;
- (4) a xylene-soluble content of less than 1% by weight;
- (5) a chemically bound proportion of comonomer in the range of 0.01 to 15 mol %;
- (6) an E modulus, measured in a tensile test, in the range of from 1500 to 7500 (tensile test in accordance with ISO 527);
- and
- (7) haze of less than 8% (determined in accordance with ASTM D 1003).
Dependencies are inferred from the claim text.