Claims
- 1. A process for the preparation of a polymer latex which comprises:
- a. homogenizing water, an emulsifier and an initiator or mixture thereof having a water solubility of <10.sup.-2 g/l in the presence or absence of a solvent, said homogenisation being at a temperature above the melting point of the initiator or mixture thereof in the absence of the solvent,
- said solvent having a water solubility of <10.sup.-2 g/l H.sub.2 O and a molecular weight of less than 5,000 and which forms a solution with said initiator or mixture thereof at the homogenisation temperature,
- whereby an emulsion containing fine droplets of initiator is formed;
- b. adding water and a polymerizable monomer with or without additional emulsifier to the emulsion of a., whereby a substantial portion of said monomer diffuses into said initiator droplets; and,
- c. initiating the polymerization of said monomer by heating.
- 2. The process according to claim 1, wherein when oil-soluble initiators without the presence of solvent are used in step a., an amount of initiator from 0.5:1000-2:100, based on the total amount of water in the final latex, by weight, is used.
- 3. The process according to claim 1, wherein in addition to the initiator in step a., said solvent is used in an amount in proportion to water in the final latex of 0.5:1000-5:100 and in an amount in proportion to initiator of from 0.05:1-10:1, by weight.
- 4. The process according to claim 1, wherein there is employed an anionic, cationic or non-ionic emulsifier in a total amount of 1:1000 to 5:100, based on the total amount of water in the final latex, by weight, and adding this emulsifier partly or entirely in step a., and adding any remainder of emulsifier in the step b.
- 5. The process according to claim 1, wherein the initiator or initiator mixture has a water solubility of <10.sup.-3 g/l H.sub.2 O.
- 6. The process according to claim 1, wherein the initiator or initiator mixture has a water solubility of <10.sup.-4 g/l H.sub.2 O.
- 7. The process according to claim 1 wherein said solvent has a water solubility of <10.sup.-3 g/l H.sub.2 O.
- 8. The process according to claim 1 wherein said solvent has a water solubility of <10.sup.-4 g/l H.sub.2 O.
- 9. The process according to claim 1 wherein said solvent has a molecular weight of <500.
- 10. The process according to claim 1 wherein the initiator droplets are less than 0.2 microns.
- 11. The process according to claim 12 wherein the initiator droplets are less than 0.1 microns.
- 12. The process according to claim 1 wherein the initiator is one or more of dioctanoyl peroxide, didecanoyl peroxide, dioctanoyl-peroxydicarbonate, didecyl-peroxydicarbonate, or didodecyl-peroxydicarbonate.
- 13. The process according to claim 1 wherein the initiator is lauroyl peroxide or dicetylperoxydicarbonate.
- 14. The process according to claim 1 wherein the monomer employed in step b. is vinyl chloride.
- 15. The process according to claim 4 wherein a part of the emulsifier is added in step b.
Priority Claims (1)
Number |
Date |
Country |
Kind |
783717 |
Nov 1978 |
NOX |
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Parent Case Info
This is a continuation-in-part of U.S. application Ser. No. 91,492, filed Nov. 5, l979, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
2475016 |
De Nie |
Jul 1949 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
91492 |
Nov 1979 |
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