Process for the crystallization of polyethylene naphthalate prep

Details Process for the crystallization of polyethylene naphthalate prep Process for the crystallization of polyethylene naphthalate prep

1997-04-02

1998-04-28

Acquah, Samuel A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528298, 528481, 528491, 528492, 528495, 528499, 528503, 525444, 526 71, C08F 610

Patent

active

057445788

ABSTRACT:
A process is disclosed for the crystallization of a PEN prepolymer containing volatile components. The temperature is maintained in the range of about 20.degree. C. above the Tg and about 10.degree. C. below the Tm while the PEN prepolymer is agitated. The PEN prepolymer is present as chips or pellets. The crystallization is performed in the presence of a liquid or a mixture of liquids that do not degrade the polymer during crystallization. The liquid or liquids employed may be those whose vapor pressure at the amorphous PEN softening temperature are insufficient to forestall expansion of the pellets. When this class of liquid or liquids is employed, the crystallization vessel is pressurized with an inert gas, including air, to prevent the prepolymer expansion. If the liquid or liquids possess sufficiently high vapor pressures at the PEN softening temperature, the pellets do not expand even without the inert air pressurization.

REFERENCES:
patent: 4755587 (1988-07-01), Rinehart
patent: 4963644 (1990-10-01), Duh
patent: 5225448 (1993-07-01), Maier et al.
patent: 5290913 (1994-03-01), McAllister et al.
patent: 5523361 (1996-06-01), Tung et al.
patent: 5532335 (1996-07-01), Kimball et al.

Affiliated with

Also associated with

Rating

Process for the crystallization of polyethylene naphthalate prep does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the crystallization of polyethylene naphthalate prep, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the crystallization of polyethylene naphthalate prep will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1532843