Preparation of porous polyester beads

Details Preparation of porous polyester beads Preparation of porous polyester beads

1992-11-19

1993-07-06

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 56, 521 64, 521182, 528272, 5283082, 528483, 528502, 528503, C08J 916, C08J 918

Patent

active

052254488

ABSTRACT:
High molecular weight polyethyleneterephthalate resin is currently being used in vast quantities in manufacturing tire cord and in manufacturing trays for frozen foods which can be heated in either microwave or convection ovens. In some applications polyester resins having ultra-high molecular weights are required. For example, some techniques for producing polyester yarn by solution spinning demand ultra-high molecular weight polyester. Unfortunately, it becomes progressively more difficult and expensive to produce polyester resins having higher and higher molecular weights utilizing standard commercial polymerization techniques. This invention discloses a technique for preparing porous polyester beads which can be solid state polymerized very rapidly to ultra-high molecular weights. This invention more specifically discloses a process for preparing ultra-high molecular weight polyester resin which comprises: (1) dissolving a polyester prepolymer in a suitable organic solvent to produce a polyester prepolymer solution; (2) allowing droplets of the polyester prepolymer solution to drip into a coagulation bath to produce porous polyester beads; (3) recovering the porous polyester beads from the coagulation bath; (4) removing residual organic solvent from the porous beads; and (5) solid state polymerizing the porous polyester beads at an elevated temperature to produce the ultra-high molecular weight polyester resin.

REFERENCES:
patent: 3586647 (1971-06-01), Kraemer
patent: 4755587 (1988-07-01), Rinehart
patent: 4792573 (1988-12-01), Cohn
patent: 4876326 (1989-10-01), Rinehart
patent: 4917845 (1990-04-01), Cohn
patent: 4957945 (1990-09-01), Cohn
patent: 4977196 (1990-12-01), Scannapieco

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