Polymer foams with inherent nonflammability and thermal stabilit

Details Polymer foams with inherent nonflammability and thermal stabilit Polymer foams with inherent nonflammability and thermal stabilit

1992-09-15

1996-05-07

Johnson, Rachel

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521153, 521154, 521157, 521178, 521179, 521182, 521184, 521187, 521189, 521902, 521907, C08G 7700, C08G 7756, C08G 7900, C08G 7908

Patent

active

055147267

ABSTRACT:
Polymeric foams with novel chemical compositions are prepared by the condensation of specially-synthesized precursors, which contain (in addition to carbon and hydrogen) one or more of the following elements: oxygen, fluorine, nitrogen (in structures with stable chemical bonds), silicon, boron, phosphorus (in high oxidation states), and certain metals (and/or their oxides and hydroxides). Upon mixing in the proper proportions and/or heating these precursors react rapidly to generate polymeric networks, consisting of heterocyclic crosslink centers, connected with heterochain segments; hydrogen is largely eliminated or replaced by fluorine. These structures possess inherent nonflammability and high thermoxidative stability. Foaming is effected by the gaseous by-products of the condensation reactions, as well as by the addition of foaming agents. The resulting foam products can be formulated to have a wide range of densities and flexibilities.

REFERENCES:
patent: 3489696 (1970-01-01), Miller
patent: 4540717 (1985-09-01), Mahnke
patent: 4694025 (1987-09-01), Park
Malcolm P. Stevens, "Polymer Chemistry, An Introduction," pp. 122-125 (1990).
John Wiley & Sons, "Fibers, Optical To Hydrogenation," Encyclopedia of Polymer Science and Engineering, vol. 7, pp. 154-179.
Polyurethanes, Part I; J. H. Saunders and K. C. Frisch; 1962 p. 97.
Polyurethanes, Part II; J. H. Saunders and K. C. Frisch; 1964, p. 224.

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