Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1990-05-10
1992-03-03
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
526 87, 526206, 526249, 526253, 526254, 526255, C08F25908, C08F 1422
Patent
active
050934279
ABSTRACT:
Melt processable copolymers of vinylidene fluoride and hexafluoropropylene, containing from about 1% to about 20% hexafluoropropylene by weight, are prepared by emulsion polymerization of vinylidene fluoride and hexafluoropropylene in a stirred aqueous reaction medium. The reaction medium is formed by charging to a heated reactor, water, vinylidene fluoride, an initiator to start the polymerization, and a water-soluble surfactant capable of emulsifying both the initiator and the reaction mass during polymerization. Additional amounts of vinylidene fluoride and initiator are fed to the reaction medium to continue polymerization of the vinylidene fluoride monomer until from about 50% to about 90% of the total weight of the vinylidene fluoride monomer utilized in the process has been added to the reaction medium. There is then added to the reaction medium (i) from about 1% to about 20% hexafluoropropylene by weight, based upon the combined weight of the hexafluoropropylene and the total weight of the vinylidene fluoride utilized in the process, and (ii) the balance of the vinylidene fluoride utilized in the process. The resulting vinylidene fluoride/hexafluoropropylene copolymers are characterized by improved mechanical properties and a DSC melting point typically in the range of from about 160.degree. C. to about 170.degree. C., preferably from about 163.degree. C. to about 168.degree. C.
REFERENCES:
patent: 3624064 (1971-11-01), Toyoda et al.
patent: 3732184 (1973-05-01), Lindemann et al.
patent: 4076929 (1978-02-01), Dohany
patent: 4569978 (1986-02-01), Barber
patent: 4851479 (1989-07-01), Blaise et al.
Tournut et al., "Some Aspects of Thermoplastic Copolymers of Vinylidene Fluoride" (Abstract #21) (1988).
Tournut et al., "Some Aspects of Thermoplastic Copolymers of Vinylidene Fluoride" (Poster).
Atochem North America, Inc.
Sarofim N.
Schofer Joseph L.
LandOfFree
Copolymers of vinylidene fluoride and hexafluoropropylene and pr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Copolymers of vinylidene fluoride and hexafluoropropylene and pr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Copolymers of vinylidene fluoride and hexafluoropropylene and pr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-273043