High resistance polypropylene tube
US6433087B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2000 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Jul 31, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F297/083
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a high resistance polypropylene tube especially with a high modulus of elasticity in extension, high impact strength, annular rigidity and resistance towards knocks. The inventive tube is made of polypropylene and has a modulus of elasticity in extension of 1300-2300 N/mm2 and an impact strength of 60-110 kJ/m2. The inventive tube is produced by extrusion of a plastic moulding material consisting of two constituents A and B of composition A) 80-98 mass parts of an isotactic polypropylene homopolymer as a coherent matrix constituent with a decade regularity of >95% and B) 2-20 mass parts of a copolymer, consisting of 50-70 mass parts of propylene and 30-50 mass parts of ethylene and/or other C4-C8-&agr;-olefins as a dispersedly distributed elastomer component. The intrinsic viscosity ratio of both components B/A is 0.9-1.5 and the melt flow index of the moulding material is 0.15-0.8 g/10 min. The polypropylene tubes are suitable for use in waste water systems, especially as gully pipes, rainwater pipes, domestic drainpipes, or sound insulation pipes or shaft elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.