Method for improvement of polybutylene pipe strength

Details Method for improvement of polybutylene pipe strength Method for improvement of polybutylene pipe strength

1990-07-23

1992-01-21

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642094, 264237, 425 71, B29C 4788

Patent

active

050826131

ABSTRACT:
A process is disclosed for the formation of polybutylene pipes having improved mechanical properties, by reduction in the rate of cooling of the extrudate used to form the pipe sections. Preferably, the ratio of the cooling bath residence time in minutes divided by the cooling water temperature in degrees Fahrenheit is selected to be in the range of from about 0.004 to about 0.010.

REFERENCES:
patent: 3553303 (1971-01-01), Zavasnik
patent: 3576051 (1971-04-01), Click et al.
patent: 3686388 (1972-08-01), Beckmann et al.
patent: 3804567 (1974-04-01), Recknagel
patent: 3936524 (1976-02-01), Toba et al.
patent: 4120926 (1978-10-01), Titz
patent: 4314958 (1982-02-01), Macleod et al.
patent: 4783301 (1988-11-01), Hong
patent: 4812274 (1989-03-01), Labaig et al.

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