Method of increasing polymerization reaction rates in the produc

Details Method of increasing polymerization reaction rates in the produc Method of increasing polymerization reaction rates in the produc

1978-02-13

1979-04-10

Lusignan, Michael R.

Coating processes

With post-treatment of coating or coating material

Heating or drying

427439, B05D 118, B05D 302

Patent

active

041489497

ABSTRACT:
A method of increasing polymerization reaction rates during the production of a fiber-thermoplastic matrix by in situ bulk polymerization is described, allowing polymerization to at least 25% polymer content by weight of the matrix in less than 8 minutes. In 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, polymerized by the application of controlled temperature and pressure conditions, reaction rates of less than 8 minutes are attained by: (a) initiating polymerization with the matrix containing a monomer concentration in excess of that which if completely polymerized is desired in the final product matrix; and (b) polymerizing the monomer contained in the matrix until the desired level of polymer is attained while, simultaneously with the polymerizing step, removing excess monomer at a controlled rate such that the reaction is sustained until the desired level of polymer in the finished matrix is attained. The resulting matrix is then treated further to remove any excess monomer and is suitable for molding by the application of pressure and heat into useful products.

REFERENCES:
patent: 2116318 (1938-05-01), Miles
patent: 2516064 (1950-07-01), Marks
patent: 2517698 (1950-08-01), Muskat
patent: 2631955 (1953-03-01), Muskat
patent: 3380980 (1968-04-01), Calkins et al.
Beall, F. C. et al., Direct and RF Heating Curing of Wood-Plastic Composites, Forest Product, Journal, vol. 16, No. 9, Sep. 1966, pp. 99-106.

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