Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2006-11-21
2006-11-21
Hightower, P. Hampton (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S312000, C528S322000, C528S332000, C528S335000, C528S336000, C528S340000
Reexamination Certificate
active
07138482
ABSTRACT:
In the production method of polyamide of the present invention, the mole balance at a set point during melt polymerization is estimated from a pre-established equation for calculating the mole balance during melt polymerization from a melt viscosity. On the basis of the estimated mole balance, the subsequent conditions of melt polymerization of a batch and the polymerization conditions of the next and subsequent batches are determined. In addition, the mole balance, molecular weight and relative viscosity of melt-polymerized polyamide are estimated from pre-established equations each for respectively calculating the mole balance, molecular weight and relative viscosity at the end point of melt polymerization from the melt viscosity. The conditions for solid phase-polymerizing the melt-polymerized polyamide are determined on the basis of estimated values.
REFERENCES:
patent: 4831108 (1989-05-01), Richardson et al.
patent: 5723567 (1998-03-01), Hewel et al.
patent: 6303741 (2001-10-01), Tanaka
patent: 6489435 (2002-12-01), Tanaka et al.
patent: 6610816 (2003-08-01), Kurose et al.
patent: 6657037 (2003-12-01), Tanaka et al.
patent: 6693163 (2004-02-01), Tanaka et al.
patent: 6841651 (2005-01-01), Maruo et al.
patent: 6881477 (2005-04-01), Presenz et al.
patent: 2005/0119446 (2005-06-01), Tanaka et al.
Kikuchi Minoru
Kurose Hideyuki
Shida Takatoshi
Tanaka Kazumi
Antonelli, Terry Stout and Kraus, LLP.
Hampton Hightower P.
Mitsubishi Gas Chemical Company Inc.
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