Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1995-01-03
1996-05-14
Dodson, Shelley A.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
428 357, 428 361, 428 363, 428 364, 528126, 528171, 528174, 528176, 528179, 528225, 528226, 528229, 528392, 540224, 568 31, 568337, B29D 2300, C08G 1000, C07D49800
Patent
active
055165664
ABSTRACT:
Low molecular weight cyclic oligomers of formula (I) ##STR1## in which n is an integer of 2 to 20, and each C in the oligomer is a radical of formula (II): ##STR2## and each X in the oligomer is --O--R--O-- or --S--R--S--, B and D are both carbonyl groups CO, or together represent a divalent radical of formula ##STR3## in which A.sub.1, A.sub.2, A.sub.3 A.sub.4, Ar.sub.1, Ar.sub.2 and Ar.sub.3 are selected from a variety of aromatic radicals, A.sub.1, A.sub.2, Ar.sub.3 and Ar.sub.4 also possibly being hydrogen, are useful in the production of high molecular weight, linear, polyketones, polyphthalazines and polyisoquinolines; the cyclic oligomers have low melt viscosities when heated above their softening temperatures and can be readily molded, whereafter they can be ring-open polymerized to form molded high molecular weight polymer products with excellent properties.
REFERENCES:
patent: 5107029 (1992-04-01), Walker, Jr. et al.
patent: 5306789 (1994-04-01), Hay et al.
patent: 5338881 (1994-08-01), Walker, Jr. et al.
Chan Kwok P.
Hay Allan S.
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