Method of controlling monomer loss during the production of a fi

Details Method of controlling monomer loss during the production of a fi Method of controlling monomer loss during the production of a fi

1977-01-14

1977-09-27

Kucia, Richard R.

Plastic and nonmetallic article shaping or treating: processes

With printing or coating of workpiece

Coating or impregnating workpiece before molding or shaping...

264 37, 264128, 264136, B29D 720, B29D 2700

Patent

active

040512142

ABSTRACT:
An improved method of controlling monomer loss during the production of a fiber-thermoplastic matrix by in situ bulk polymerization is described, the improvement allowing polymerization to greater than 25% polymer content by weight of the matrix within less than eight minutes. A fibrous web of less than 0.25-inch thickness, saturated with a liquid phase polymerizable composition containing a vinyl monomer and a thermally activated free radical initiator at 1/2-10% by weight of the composition is polymerized under controlled conditions in which the matrix is: (a) confined between heat transfer surfaces at 0.2-20 psig; (b) heated to a temperature sufficient to initiate polymerization but below the boiling point of the composition; (c) increased in temperature as the boiling point of the composition increases during polymerization while still maintaining the temperature below the boiling point of the composition; and (d) increased in temperature above the boiling point of the composition when the desired polymer content is obtained in order to evaporate residual monomer from the matrix. The resulting matrix is suitable for molding by the application pressure into useful products.

REFERENCES:
patent: 3051679 (1962-08-01), Forsyth
patent: 3188369 (1965-06-01), Guthrie
patent: 3301739 (1967-01-01), Vanderbilt
patent: 3350475 (1967-10-01), Watnabe
patent: 3549509 (1970-12-01), Casalina
patent: 3660223 (1972-05-01), Casalina

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