Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1986-02-28
1989-03-14
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525420, 528207, 528208, 528228, 528229, 528321, 528322, 528337, 528341, 528342, 528353, 528363, C08G 6948
Patent
active
048125318
ABSTRACT:
Thermosettable prepolymers or polymers are prepared by reacting (A) the reaction product of (1) a heterocyclic material having one or more rings, at least one nitrogen atom and at least two substituent groups which have at least one reactive hydrogen atom attached to a carbon atom which is attached to a heterocyclic ring such as 2,3,5,6-tetramethylpyrazine; (2) a cycloaliphatic or aromatic carboxylic acid mono- or dianhydride such as pyromellitic dianhydride; and (3) a material containing a polymerizable ethylenically unsaturated group and at least one group selected from (a) a heterocyclic material having one or more rings, at least one nitrogen atom and at least one substituent group which has at least one reactive hydrogen atom attached to a carbon atom which is attached to a heterocyclic ring such as 2-methyl-5-vinyl pyridine or (b) a cycloaliphatic or aromatic carboxylic acid mono- or dianhydride group such as cis-5-norbornene-endo-2,3-dicarboxylic anhydride; with (B) an aqueous or alcoholic solution of a hydroxide, carbonate or bicarbonate of a metal of Groups I-A or II-A, such as sodium hydroxide.
These polymers or prepolymers when subjected to a thermoset condition by heat and pressure or by homopolymerization in the presence of or copolymerization with an N,N'-bis-imide exhibit good char forming properties when subjected to a temperature of 700.degree. C.
REFERENCES:
patent: 2671071 (1954-03-01), Laakso et al.
patent: 4579809 (1986-04-01), Irving
Anderson Harold D.
The Dow Chemical Company
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