Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2005-03-31
2010-06-15
Rábago, Roberto (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S053000, C526S065000, C526S348000, C138S121000, C138S137000
Reexamination Certificate
active
07737222
ABSTRACT:
A pressureless pipe and polymer composition for making such a pipe as well as the use of the polymer composition for pressureless pipes and supplementary parts, are disclosed. The polymer composition is characterized in that the polymer comprises a multimodal ethylene polymer including a copolymer of ethylene and a C4-C10&agr; -olefin comonomer; the ethylene polymer has a total density of 953-958 kg/m3and a MFR5of 0.2-2.0 g/10 min; the ethylene polymer has a modulus of elasticity, determined according to ISO 178 of 1300-1700 MPa; the ethylene polymer has a resistance to slow crack growth, determined according to ASTM F 1473 of more than 1.5 hrs.
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Andersson May-Lis
Bäckman Mats
Ek Carl-Gustaf
Lund Kenneth
Vahteri Markku
Borealis Technology Oy
Merchant & Gould P.C.
Rábago Roberto
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