Branched copolyesters especially suitable for extrusion blow mol

Details Branched copolyesters especially suitable for extrusion blow mol Branched copolyesters especially suitable for extrusion blow mol

1994-09-06

1995-08-15

Acquah, Samuel A.

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

Synthetic resins

From carboxylic acid or derivative thereof

528272, 528296, 528300, 528301, 528307, 5283086, 2641761, 264239, C08G 6312

Patent

active

054420369

ABSTRACT:
Disclosed are polyester particles adapted to be extrusion blow molded into articles having improved rheological qualities and a process for producing such particles, said particles comprising a polyester having repeat units from about 40 to 100 mol % terephthalic acid, about 80-98 mol % ethylene glycol, about 0.5-10 mol % 1,4-cyclohexanedimethanol, about 3-10 mol % diethylene glycol, and about 0.05-1.0 mol % of a polyfunctional branching agent, the molecular weight gradient from core to surface of said particles satisfying the following parameters:
(A) number average less than 5500,
(B) weight average less than 35,000, and
(C) Z average less than 110,000

REFERENCES:
patent: 2895946 (1959-07-01), Huffman
patent: 3406045 (1968-10-01), Sattler
patent: 3502620 (1970-03-01), Caldwell
patent: 3576773 (1971-04-01), Vaginay
patent: 3580874 (1971-05-01), Nishimura
patent: 4064112 (1977-12-01), Rothe et al.
patent: 4217440 (1980-08-01), Barkey
patent: 4983711 (1991-01-01), Sublett et al.
patent: 5187216 (1993-02-01), Cassell et al.
United States Defensive Publication T954,005, "Process for Preparing Containers Using Branched Polyesters", Jan. 4, 1977.

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