Process for the preparation of aqueous, colloidal dispersions of

Details Process for the preparation of aqueous, colloidal dispersions of Process for the preparation of aqueous, colloidal dispersions of

1981-06-22

1982-07-06

Schofer, Joseph L.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

526 91, 526211, 526255, 524767, C08K 532

Patent

active

043382371

ABSTRACT:
An improved process for the preparation of aqueous, colloidal dispersions of copolymers comprising at most 60 mole % of units of tetrafluoroethylene, 60 to 40 mole % of units of ethylene and 0 to 15 mole % of units of at least one other .alpha.-olefinic monomer, which can be copolymerized with tetrafluoroethylene and ethylene, in the presence of manganese compounds as the catalyst is described. In this process, the emulsion polymerization is carried out in an aqueous phase in the presence (a) of a chain transfer agent of the formula X--CH.sub.2 --COOR (X=Cl, Br, COOH, COOR, COCH.sub.3, CH.sub.3, C.sub.2 H.sub.5 or C.sub.3 H.sub.7 ; and R=C.sub.1 -C.sub.4 -alkyl), and (b) of a compound which stabilizes the dispersion and has the formula ##STR1## (Y=COONH.sub.4, COOH, CH.sub.3, CH.sub.2 OH, CH.sub.2 COOH or CH.sub.2 COONH.sub.4). (b) can additionally contain an ammonium salt of an inorganic non-metal acid, for example ammonium chloride or fluoride. Terpolymers or quaterpolymers containing, in addition to tetrafluoroethylene and ethylene, preferably hexafluoropropylene and/or a "bulky" vinyl monomer as the third and/or fourth comonomer are preferably prepared. The copolymer dispersions thus prepared have very low coagulate contents and are very stable and the copolymers have melt flow indices most appropriate to the processing operations. They can be processed to coatings and shaped articles.

REFERENCES:
patent: 3704285 (1972-11-01), Porter
patent: 3707519 (1972-12-01), Hahn
patent: 3859262 (1975-01-01), Hartwimmer
patent: 4016345 (1977-04-01), Holmes
patent: 4078134 (1978-03-01), Kuhls et al.
patent: 4098975 (1978-07-01), Shimuzo et al.
patent: 4123602 (1978-10-01), Ukinashi et al.

Affiliated with

Also associated with

Rating

Process for the preparation of aqueous, colloidal dispersions of 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 the preparation of aqueous, colloidal dispersions of, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of aqueous, colloidal dispersions of will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2167807