Butene and polybutene formulae

In the following we will only consider polybutylene-1, simply named polybutene or polybutylene (PB). 

Polybutene is a polyolefin differing from polyethylene and polypropylene by the number of carbon atoms in the pendant groups. Polybutene is mainly used for sealing, films and pipes conveying pressurized hot and cold water. 

To illustrate the differences in creep behaviour between the main polyolefins, after 1000 h under 8 MPa at room temperature, the elongations are, for example  

These results relate to some grades only and cannot be generalized. 

There are numerous grades of copolymers with polyethylene having some differing properties. 

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