Well over 100 billion pounds of polymer are produced each year, and it is expected that this. Effects of agitation in emulsion polymerization of vinyl. The goal of this study is to investigate the feasibility to enhance the ethylene incorporation using an environmentalfriendly miniemulsion polymerization technique. It is only sparingly soluble in water but readily soluble in many organic solvents such as ethyl acetate and ethanol. A semiinterpenetrating polymer network semiipn combining vinyl acetateethylene vae and butyl acrylate ba, as well as vinyl acetate vac, was prepared through emulsion polymerization with the help of selfmade dispersant and diethylene glycol diacrylate degda, the crosslinking agent. Product and company information hoehn plastics inc. Other emulsion polymerization methods including micro, mini and inverseemulsion polymerization were mentioned, followed by the description of main emulsion polymerization processes comprising batch, semicontinuous, continuous and seeded, and their application types. The emulsion polymerization of vinyl acetate possesses the rather typical properties in comparison the emulsion polymerizations of the comonomers. Vinyl acetateacrylic acid copolymer for enhanced oil recovery.
The invention is characterized in that complex emulsifying agents added into a reaction system include a nonion emulsifying agent. Broadly speaking, there are three different types of eva copolymer, which differ in the vinyl acetate va content and the way the materials are used. Persulfate metabisulfite initiated vinyl acetate vinyl. Polyvinyl acetate produced industrially by the polymerization of vinyl acetate in bulk or solution processes. Ewart equation is not applicable to the emulsion polymerization of vinyl acetate. More importantly, our employees are experts in polymerization, process technology, manufacturing and. During emulsion polymerization of vinyl acetate vac specific interactions surfactantmonomer and surfactantinitiator has been evidenced. The vinyl acetate ethylene vae copolymer is a product based on the copolymerization of vinyl acetate and ethylene in which the vinyl acetate content can range between 6095%, and the ethylene content ranges between 540% of the total formulation. Emulsion polymerizations of vinyl acetate vac were performed by fully or partially. Vae copolymers form the basis for engineering different properties in the individual end application.
Secondly, the emulsion polymerization of vinyl acetate was given. Vinyl acetate methyl methacrylate acrylonitrile some monomers that can be polymerized free radically ch 2 ch cnch. A prior extensive experimental phase identified those variables that are most important for ethylene. Mechanism of vinyl acetate emulsion polymerization french 1958.
Such a procedure is described for many time and known to the skilled person, for example in encyclopedia of polymer science and engineering. The important copolymers, ethylenevinyl acetate and vinyl chloridevinyl. The weight percent of vinyl acetate usually varies from 10 to 40%, with the remainder being ethylene. In the emulsion polymerization products, polyvinyl acetate emulsion. Proprietary process technology eva ethylene vinylacetate.
It should be noted that vae copolymers differ from their counterpart ethylenevinyl acetate eva copolymers with the difference in their monomer composition. Emulsion polymerization of vinyl acetate in the presence. Persulfate initiated vinyl acetate vinyl versatate copolymer latex d. The 3 moles of ethylene oxide provides small particle sizes and aides in increased stability of an emulsion. However, examination of the polymerization of vinyl. Celanese emulsion polymers is a global leader in vinyl acetateethylene vae emulsions. Emulsion polymerization of vinyl acetate pdf free download. Pdf emulsion polymerisation of styrene and vinyl acetate. Some grades are available with antiblock and slip additives. Ethylene vinyl acetate an overview sciencedirect topics. Polyvinyl acetate and related polymers springerlink. Emulsion polymerization of vinyl acetate springerlink.
Efficacy of initiation by persulfate in vinyl acetate emulsion polymerization. Vinyl acetate emulsion polymerization and copolymerization with acrylic monomers provides a collection and logical organization of the published data much of it formerly found fragmented throughout various journals and little of it referenced in general emulsion polymerization books. Emulsion polymerization of vinyl acetate okamura 1962. The vinyl acetate ethylene copolymer dispersions are produced via an aqueous, radically initiated emulsion polymerization using conventional emulsion polymerization procedure. Emulsion and miniemulsion polymerization emulsion and miniemulsion polymerizations are signi. The emulsion polymerization kinetics of vinyl acetate and butyl acrylate in presence of behm was studied. Vinyl acetate ethylene emulsions market 2019 global. Vinyl acetate from ethylene, acetic acid and oxygen. Click download or read online button to get emulsion polymerization of vinyl acetate book now. Vinyl acetate vac and vinyl pivalate vpi were homopolymerized and copolymerized by lowtemperature redox emulsion polymerization using a manganese chelate as initiator.
Vinyl acetate has high water solubility, a high monomerpolymer swelling rati o, and a high chain tr ansfer constant. The industrial importance of vinyl acetate latexes makes the mechanism and kinetics of their emulsion polymerization of practical as well as scientific interest. This is considered to be due to two factors, namely, 1 the great solubility in water of vinyl acetate and 2 the fact that vinyl acetate is easily subject to the influences of retarders or chain transfer agents. Due to the fact that the vinyl acetate is an esther, it presents the reactive properties of said group. The order of the polymerization reaction with respect to the behm in. At this ratio high chemical interaction between surfactant and initiatorhas. First, welldefined hydrophilic macromolecular raft agents macroraft bearing a xanthate chain end were synthesized by raftmadix polymerization of nvinylpyrrolidone nvp and n. Schematic representation of the initial stages of an emulsion polymerization. Ethylenevinyl acetate copolymer eva is a copolymer of ethylene and vinyl acetate as shown in fig. The emulsion polymerization of vinyl acetate monomer vam, ethylene and nmethylol acrylamide nma was carried out in a high pressure stirred reactor using an rushton. Pdf kinetic data on the emulsion polymerisation of styrene are discussed in the light of the smithewart theory as modified by gardon. Kinetics of emulsion copolymerization of vinyl acetate and. Us8586686b2 process for preparing vinyl acetateethylene. Emulsion polymerization of vinyl acetatebutyl acrylate.
If polymerization occurs inside a container, the container may violently rupture. The emulsion polymerization of vinyl acetate was investigated with the use of block copolymers of ethylene and propylene oxides commercially known as. Emulsion polymerization of vinyl acetate download ebook. Us2703794a us245079a us24507951a us2703794a us 2703794 a us2703794 a us 2703794a us 245079 a us245079 a us 245079a us 24507951 a us24507951 a us 24507951a us 2703794 a us2703794 a us 2703794a authority us united states prior art keywords ethylene vinyl acetate weight copolymer water prior art date 19510904 legal status the legal status is an assumption and is not a legal conclusion. The emulsion polymerization of vinyl acetate was investigated with the use of block copolymers of ethylene and propylene oxides commercially known as pluronic surfactants as emulsifying agents. Vinyl acetateethylene vae is a combination of ethylene and vinyl acetate two monomers possessing special properties as e. Vinyl acetate ethylene vae emulsions are based on the copolymerization of vinyl acetate and ethylene, in which the vinyl acetate content can range between 60 and 95 percent, and the ethylene. Improving the water sensitivity of polyvinyl acetate pvac films as well as pressure sensitivity, adhesion and washability of polybutyl acrylate were achieved by using bis 2ethylhexyl maleate behm. Pdf emulsion polymerization of vinyl acetate in the presence of a. This site is like a library, use search box in the widget to get ebook that you want. Abstract the emulsion polymerization of vinyl acetate was investigated with the use of block copolymers of ethylene and propylene oxides commercially known. Mechanism of vinyl acetate emulsion polymerization. Applications edit as an emulsion in water, pvac emulsions are used as adhesives for porous materials, particularly for wood, paper, and cloth, and as a consolidant for porous building stone, in.
Other synthetic latexes contain copolymers of ethylene, styrene, vinyl esters. Process for the production of ethylenevinyl acetate. Pdf in this study, the emulsion homopolymerization system containing vinyl acetate, potassium persulfate, a new cationic polymeric surfactant and. Chain transfer to polymer in freeradical bulk and emulsion polymerization of vinyl acetate studied by nmr spectroscopy. The surfactantfree emulsion polymerization of vinyl acetate vac was achieved using raftmadixmediated polymerizationinduced selfassembly pisa process in water. We manufacture these highperformance emulsions in all three major regions of the world at our facilities throughout north america, europe and asia. Poly vinyl acetate latexes were the first synthetic polymer latexes to be made on a commercial scale. Ethylene vinyl acetate eva, also known as poly ethylene vinyl acetate peva, is the copolymer of ethylene and vinyl acetate. Thus more than 45 years after the first commercial production of vinyl acetate latexes, their use is still growing, both in actual quantities and different applications. Also produced in suspension and emulsion processes. Cn102030858b vinyl acetateethylene copolymer emulsion. Polyvinyl acetate is prepared by the polymerization of vinyl acetate monomer free radical vinyl polymerization of the monomer vinyl acetate. Vinyl acetate pdhg vam nov2011 page 1 of 8 vinyl acetate acetic acid vinyl ester cas no.
Due to this interactions the cmc of the surfactant is higher and the electrical conductivity sharply decreases at surfactant initiator molar ratio 1. The invention relates to vinyl acetateethylene copolymer emulsion vae emulsion and a synthesis method thereof. The synthesis method comprises the processes of preemulsification, emulsion polymerization reaction, finishing and defoaming. Us2703794a ethylenevinyl acetate polymerization process. A process for preparing a vinyl acetateethylene copolymer by means of free radically. Ethylenevinyl acetate copolymers having a gel content of not more than 0. The process differs from emulsion polymerization in the type and larger particle size in which polymerization occurs, and in the kind of initiator employed. It was concluded that emulsion with high hydroxyl content is very useful in the coating industry. Miniemulsion copolymerization of ethylene and vinyl acetate.
340 638 677 862 309 1405 900 1551 1447 55 1263 1487 669 1081 1484 286 710 1576 1109 1304 706 163 723 588 158 868 1225 146 56 1057 1326