Process for producing an expanded seed copolymer and product the

Details Process for producing an expanded seed copolymer and product the Process for producing an expanded seed copolymer and product the

1983-12-02

1986-04-15

Cockeram, Herbert S.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 37, 521 54, 521 58, C08J 916, C08J 922

Patent

active

045828598

ABSTRACT:
An improved process for the manufacture of crosslinked copolymer particles from seed particles by imbibing a monomer therein and polymerizing the same under controlled suspension conditions wherein said improvement comprises expanding the seed in staged or sequential steps of feeding lower levels of crosslinking monomers in the early stages and preferably higher levels of crosslinking monomers at later stages of polymerization.

REFERENCES:
patent: 3332890 (1967-07-01), Hatch
patent: 3792029 (1974-02-01), Roubinck et al.
patent: 3959189 (1976-05-01), Kitamori
patent: 3991017 (1976-11-01), Barrett et al.
patent: 4085169 (1978-04-01), Saito et al.
patent: 4091054 (1978-05-01), Saito et al.
patent: 4173688 (1979-11-01), Saito et al.
patent: 4419245 (1983-12-01), Barrett et al.
Translation--Rohm & Haas, of East German Patent Specification, No. 204,702, VEB Chemi-kombinat, Jul. 12, 1983.

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