PROCESS OF COPOLYMERIZATION IN EMULSION OF 1-ALKENES AND VINYL ESTERS WITH HIGH CONVERSION AND THEIR USE
New process conditions are described and more particularly emulsion polymerization of compositions which are based on copolymers of vinyl acetate, straight chain α-olefin and an optional third different olefinically-unsaturated co-monomer in which the α-olefin is emulsified prior to the addition into the polymerization mixture.
1 . A process for forming an emulsion composition, comprising:
providing vinyl acetate and at least one α-olefin to a vessel, wherein the at least one α-olefin is provided to the vessel pre-emulsified in the presence of at least a surfactant, a colloid protecting agent, or both; and
co-polymerizing the vinyl acetate and at least one α-olefin.
2 . (canceled)
3 . The process of claim 1 , wherein the α-olefin comprises a chain of 9 to 25 carbon atoms.
4 . The process of claim 1 , wherein the α-olefin is provided at a level from 1 to 25 weight %.
5 . The process of claim 1 , wherein the conversion level of α-olefin is greater than 90%.
6 . The process of claim 11 , wherein the one or more unsaturated polymerizable monomers are selected from the group consisting of acrylic or methacrylic alkyl esters, cycloalkyl esters, mono and diesters of maleic acid, ethylene, vinyl esters of linear or branched saturated or non saturated monocarboxylic acids having 2 to 18 carbon atoms, and combinations thereof.
7 . The emulsion composition obtained according to claim 1 .
8 . The emulsion composition of claim 7 , wherein the emulsion composition comprises particles sizes of a polymer distribution within the range 0.1μ to 10μ.
9 . A redispersible powder comprising a spray-dried emulsion composition of claim 7 .
10 . (canceled)
11 . The process of claim 1 , further comprising adding one or more unsaturated polymerizable monomers prior to co-polymerizing.
12 . The process of claim 11 , wherein the one or more unsaturated polymerizable monomers are added to the pre-emulsified at least one α-olefin prior to the vessel.
13 . The process of claim 1 , wherein the α-olefin comprises a carbon atoms chain of 12 to 18 carbon atoms.
14 . The process of claim 1 , wherein the α-olefin is provided in a level from 5 to 15 wt % on total monomer content.
15 . The process of claim 1 , further comprising spray-drying the emulsion composition to form a redispersable powder.
16 . The process of claim 15 , wherein the spray-drying is performed in the presence of an anti-caking agent and an colloidal protecting agent.
17 . The process of claim 14 , further comprising adding the redispersable powder to a cement-containing mixture.
18 . The process of claim 1 , further comprising adding a second amount of vinyl acetate to the emulsion composition.
19 . The process of claim 1 , wherein the at least one α-olefin is pre-emulsified in a composition of a colloidal protecting agent, a surfactant, anti-foaming agent, and water.
20 . The process of claim 19 , wherein the composition further includes one or more unsaturated polymerizable monomers selected from the group consisting of vinyl acetate, acrylic or methacrylic alkyl esters, cycloalkyl esters, mono and diesters of maleic acid, ethylene, vinyl esters of linear or branched saturated or non saturated monocarboxylic acids having 2 to 18 carbon atoms, and combinations thereof.