Process for preparing substantially pure high molecular weight v

Details Process for preparing substantially pure high molecular weight v Process for preparing substantially pure high molecular weight v

1989-05-01

1990-09-11

Henderson, Christopher

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 89, 526215, 526216, 526233, 424 81, C08F 210

Patent

active

049564307

ABSTRACT:
The invention relates to the production of high molecular weight vinyl lactam-quaternized amino acrylamide copolymers having less than 0.1% residual unreacted monomer, which comprises: subjecting the monomers to solution polymerization in the presence of a buffering agent having chelating properties for complexing with traces of heavy metals; controlling the pH of the polymerization to a level above 5.5 while continuously ebulating nitrogen gas through the system during reaction and incrementally adding a free radical initiator in 2 to 4 stages during the conversion to copolymer. The invention also relates to the substantially pure vinyl lactam-acrylamide copolymer having a Brookfield viscosity of at least 75,000 cps. and a residual monomer content below 0.5 wt. %, for example less than 1,000 ppm.

REFERENCES:
patent: 3428617 (1969-02-01), Sobolev
patent: 3509113 (1970-04-01), Mohagle
patent: 4456741 (1984-06-01), Ames
patent: 4663408 (1987-05-01), Schulz

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