Process for preparing core-shell emulsion polymer particles and

Details Process for preparing core-shell emulsion polymer particles and Process for preparing core-shell emulsion polymer particles and

1995-12-11

1997-06-17

Merriam, Andrew E. C.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523218, 524251, 524379, 525902, 528495, 528496, C08L 3302

Patent

active

056398050

ABSTRACT:
The present invention relates to a process for preparing polymeric particles which is specially designed to be served as an opacifying agent in coating compositions such as water-borne paints, paper coating compositions and molding compositions which have white or light color shades. In more detailed description, this invention is concerned with the process for making an aqueous dispersion of core-shell emulsion polymer particles comprising (1) preparing the core by polymerizing carboxylic acid monomers with other monoethylenically unsaturated monomers, (2) encapsulating said core with a rigid polymer shell by polymerizing shell-forming monomers, in the presence of said core particles, which are fed in such manner that compositional contents of monomers entering to a polymerization zone is changing gradually thoughout the period of monomer feeding, and (3) neutralizing with base so as to swell said core and form particles which, when dried, contain at least one void.

REFERENCES:
patent: 3637431 (1972-01-01), Brenneman
patent: 3669729 (1972-06-01), Seiner
patent: 3804881 (1974-04-01), Bassett
patent: 3891577 (1975-06-01), Kershaw
patent: 3928273 (1975-12-01), Chang et al.
patent: 4039500 (1977-08-01), Bassett et al.
patent: 4150005 (1979-04-01), Gehman et al.
patent: 4427836 (1984-01-01), Kowalski
patent: 4594363 (1986-06-01), Blankenship et al.
patent: 4880842 (1989-11-01), Kowalski et al.
patent: 5273824 (1993-12-01), Hoshino et al.

Affiliated with

Also associated with

Rating

Process for preparing core-shell emulsion polymer particles and does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for preparing core-shell emulsion polymer particles and , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing core-shell emulsion polymer particles and will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2158365