Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1995-08-04
1997-02-25
Mullis, Jeffrey C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528125, 528128, 528170, 528171, 528172, 528173, 528174, 528175, 528176, 528183, 528185, 528188, 528220, 528229, 528350, 524600, 524607, 526262, 526285, 526935, 4284111, 4284735, C08G 7310, C08G 6926
Patent
active
056060149
ABSTRACT:
Controlled molecular weight imide oligomers and co-oligomers containing pendent phenylethynyl groups (PEPIs) and endcapped with nonreactive or phenylethynyl groups have been prepared by the cyclodehydration of the precursor amide acid oligomers or co-oligomers containing pendent phenylethynyl groups and endcapped with nonreactive or phenylethynyl groups. The amine terminated amide acid oligomers or co-oligomers are prepared from the reaction of dianhydride(s) with an excess of diamine(s) and diamine containing pendent phenylethynyl groups and subsequently endcapped with a phenylethynyl phthalic anhydride or monofunctional anhydride. The anhydride terminated amide acid oligomers and co-oligomers are prepared from the reaction of diamine(s) and diamine containing pendent phenylethynyl group(s) with an excess of dianhydride(s) and subsequently endcapped with a phenylethynyl amine or monofunctional amine. The polymerizations are carried out in polar aprotic solvents such as under nitrogen at room temperature. The amide acid oligomers or co-oligomers are subsequently cyclodehydrated to the corresponding imide oligomers. The polymers and copolymers prepared from these materials exhibit a unique and unexpected combination of properties.
REFERENCES:
patent: 4837300 (1989-06-01), St. Clair et al.
patent: 5138028 (1992-08-01), Paul et al.
Polymer Preprints, vol. 30, No. 1 (Apr. 1989), "Model Branched Poly(methylmethacrylates of Controlled Molecular Weight and Architecture; Synthesis Characterization", Siochi et al, pp. 141-143, 137-140.
Connell John W.
Hergenrother Paul M.
Smith, Jr. Joseph G.
Hampton-Hightower P.
Helfrich George F.
Mullis Jeffrey C.
The United States of America as represented by the United States
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