Styrene polymer resin and composition thereof

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

Reexamination Certificate

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C525S227000, C526S065000, C526S328000, C526S347000

Reexamination Certificate

active

06933343

ABSTRACT:
The present invention provides a method for manufacturing a styrene-based polymer having the steps of continuously feeding raw materials into one end of two or more polymerization vessels connected in series; polymerizing a styrenic monomer in the coexistence of a (meth)acrylate ester monomer by using an organic radical generating agent as an initiator by a mass or solution polymerization method of continuous process; and continuously taking out a product from another end of the polymerization vessels, wherein polymerization conditions are controlled in ranges specified by the following items (a) and (b): (a) a composition of monomers to be fed is 60 to 97% by weight of a styrenic monomer(s) and 3 to 40% by weight of a (meth)acrylate ester monomer(s); and (b) a concentration of the (meth)acrylate ester monomer(s) at any part of the polymerization vessels exceeds 1% by weight based on total monomers at any time during the polymerization.

REFERENCES:
patent: 3252950 (1966-05-01), Schmitt et al.
patent: 3513145 (1970-05-01), Crawford
patent: 6759498 (2004-07-01), Ikematsu et al.
patent: 57-135814 (1982-08-01), None
patent: 59-221348 (1984-12-01), None
patent: 61-25819 (1986-02-01), None
patent: 63-286406 (1988-11-01), None
patent: 4-239511 (1992-08-01), None
patent: 9-111070 (1997-04-01), None
patent: 9-111073 (1997-04-01), None
patent: 2000-159920 (2000-06-01), None
patent: 2001-2870 (2001-01-01), None
patent: 2001-26619 (2001-01-01), None
English language translation of JP 63-286406, published Nov. 1988.

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