Star-shaped nylons, methods for their preparation, tetrasubstitu

Details Star-shaped nylons, methods for their preparation, tetrasubstitu Star-shaped nylons, methods for their preparation, tetrasubstitu

1993-04-14

1994-09-13

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528 9, 528228, 528310, 528327, C08G 6908, C08G 6914

Patent

active

053469844

ABSTRACT:
Star-shaped nylons with low melt viscosities and excellent mechanical properties, methods for their preparation, a novel tetrasubstituted carboxylic acid for use as a polymerization core therefor and methods for its preparation are provided.
A star-shaped nylon has polymer chains emanating from 3 or more polymerization initiation groups which are substituents bonded to every other or more separated carbon atoms on an aromatic ring of an aromatic compound. The star-shaped nylon is produced by homogeneously mixing the aromatic compound with molten nylon monomer and polymerizing the nylon monomer with the respective polymerization initiation groups as the starting points. A novel tetrasubstituted carboxylic acid having a structure of 3,5,3',5'-biphenyltetracarboxylic acid is useful as a polymerization core for star-shaped nylons.

REFERENCES:
patent: 3549601 (1970-12-01), Fowell
patent: 4075271 (1978-02-01), Lofquist et al.
patent: 4599400 (1986-07-01), Tomalia et al.
patent: 4650608 (1987-03-01), Takeo et al.
American Chemical Society, Jun. 1989, 30(1), pp. 117-118, J. A. Warakomski, "Polymer Preprints".

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