Hyperbranched polyaspartate esters and a process for their prepa

Details Hyperbranched polyaspartate esters and a process for their prepa Hyperbranched polyaspartate esters and a process for their prepa

1995-05-18

1996-10-01

Dodson, Shelley A.

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

Synthetic resins

From carboxylic acid or derivative thereof

525418, 525419, 525420, 528328, 528332, 528335, 528345, 560170, 560171, C08G 6948, C07C22924

Patent

active

055612148

ABSTRACT:
The present invention relates to hyperbranched polyaspartate esters containing repeating structural units corresponding to the formula I and/or II ##STR1## The present invention also relates to a process for the preparation of these hyperbranched polyaspartate esters by self condensing, via a transesterification reaction, at least a portion of the hydroxy and ester groups of the hydroxy aspartates corresponding to the above formula at a temperature of 60.degree. to 240.degree. C. to form hyperbranched polyaspartate esters and eliminating alcohols having the formula R.sub.1 --OH and/or R.sub.2 --OH.

REFERENCES:
patent: 5126170 (1992-06-01), Zwiener et al.
"The solid-phase synthesis of dendrtitic polyamides", Uhrich et al, Polymer Bulletin 25, pp. 551 to 558 (Month unavailable) 1991.
"Synthesis, Characterization, and Curing of Hyperbranched Allyl Ether-Maleate Functional Ester Resins", by Johansson et al, Journal of Polymer Science: Part A: Polymer Chemistry, vol. 31, pp. 617-624 (Month unavailable) 1993.
"High-Solid Alkyds Based on Hyperbranched (Dendritic) Polymers--A New Concept with New Opportunities", by Pettersson et al, presented at the Waterborne, Higher-Solids and Powder Coatings Symposium, Feb. 9-11, 1994.
"Chemistry of Dendritic Molecules Holds Growing Allure for Researchers", Chemical Engineering News, Feb. 1, 1993.
"Dendrimers Nearing Availability for Commercial Evaluation," Chemical & Engineering News, Aug. 16, 1993.

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