Low crystallizability polypropylene sheet
View Patent ↗A low crystallizability polypropylene sheet which has an average spherulite radius between 0.1 μm and 4 μm, an average number of spherulites of 600/mm 2 or less in a sheet cross section, a solid density of 0.895 g/cm 3 or less, a fusion enthalpy H of less than 90 J/g at the highest endothermic peak of the differential scanning calorimetry (DSC) curve, a degree of gloss of 90% or higher on at least one side and shows an exothermic peak of 1 J/g or higher at the low temperature side of said highest endothermic peak and a thickness of 50 μm or more.
1. A low crystallizability polypropylene sheet characterized in that it has an average spherulite radius between 0.1 μm and 4 μm, an average number of spherulites of 600/mm 2 or less in a sheet cross section, a solid density of 0.895 g/cm 3 or less, a fusion enthalpy H of less than 90 J/g at the highest endothermic peak of the differential scanning calorimetry (DCS) curve, a degree of gloss of 90% or higher on at least one side, and shows an exothermic peak of 1 J/g or higher at the low temperature side of said highest endothermic peak and a thickness of 50 μm or more.
2. The low crystallizability polypropylene sheet according to claim 1 , characterized in that its internal haze is not higher than (330t 2 −150t 20)%, where t is the thickness of the low crystallizability polypropylene sheet.
3. The low crystallizability polypropylene sheet according to claim 1 , characterized in that its tensile modulus is 1,500 MPa or less.
4. The low crystallizability polypropylene sheet according to claim 1 , comprising a material selected from the group consisting of homo polypropylene, random polypropylene, block polypropylene, and mixtures thereof.
5. The low crystallizability polypropylene sheet according to claim 4 , said material further comprising petroleum resin, terpene resin, or a combination thereof.
6. The low crystallizability polypropylene sheet according to claim 2 , characterized in that its tensile modulus is 1,500 MPa or less.
7. The low crystallizability polypropylene sheet according to claim 2 , comprising a material selected from the group consisting of homo polypropylene, random polypropylene, block polypropylene, and mixtures thereof.
8. The low crystallizability polypropylene sheet according to claim 3 , comprising a material selected from the group consisting of homo polypropylene, random polypropylene, block polypropylene, and mixtures thereof.
9. The low crystallizability polypropylene sheet according to claim 6 , comprising a material selected from the group consisting of homo polypropylene, random polypropylene, block polypropylene, and mixtures thereof.
10. The low crystallizability polypropylene sheet according to claim 7 , wherein said raw material further comprises petroleum resin, terpene resin, or a combination thereof.
11. The low crystallizability polypropylene sheet according to claim 8 , wherein said raw material further comprises petroleum resin, terpene resin, or a combination thereof.
12. The low crystallizability polypropylene sheet according to claim 9 , wherein said raw material further comprises petroleum resin, terpene resin, or a combination thereof.
13. A method of manufacturing a shaped article comprising thermoforming the sheet of claim 1 into said shaped article.
14. A shaped article manufactured by the method of claim 13 .