Butyl rubber conversion to dispersion and butyl rubber dipped glove
View Patent ↗Butyl rubber based coating agents for preparing a coated article, such as a glove, wherein a butyl rubber solution is in the form of a dispersion, and methods of using butyl rubber based coating agents.
1. A method of preparing a coating agent consisting of the steps in the following sequential order: a) dissolving dry butyl rubber in an organic solvent to produce a butyl rubber solution; b) adding water and at least one surfactant to said butyl rubber solution; c) mixing water, said at least one surfactant and said butyl rubber solution to obtain a desired particle size; d) removing said organic solvent under vacuum and temperature of between 120° F. and 900° F. to produce a butyl rubber dispersion; e) creaming said butyl rubber dispersion to obtain a desired solids content, wherein said desired solids content is between 5% and 55% by weight, based on the total weight of said butyl rubber dispersion; f) adding at least one curing agent and/or at least one pigment to said butyl rubber dispersion, wherein said at least one curing agent is selected from the group consisting of sulfur, sulfur donors and peroxides and wherein said at least one pigment is selected from the group consisting of calcium carbonate, carbon black, clays or other organic and inorganic pigments and dyes; and g) mixing said at least one curing agent and/or at least one pigment with said butyl rubber dispersion.
2. The method according to claim 1 , wherein said organic solvent is heptane.
3. The method according to claim 1 , wherein said desired particle size is between 0.1 microns and 10 microns.
4. The method according to claim 1 , wherein said temperature is about 140° F. to 350° F.
5. A method of preparing a coating agent consisting of the steps in the following sequential order: a) dissolving dry butyl rubber in an organic solvent to produce a butyl rubber solution; b) adding water and at least one surfactant to said butyl rubber solution; c) mixing water, said at least one surfactant and said butyl rubber solution to obtain a desired particle size; d) removing said organic solvent under vacuum and temperature of between 120° F. and 900° F. to produce a butyl rubber dispersion; e) creaming said butyl rubber dispersion to obtain a desired solids content; f) adding at least one curing agent and/or at least one pigment to said butyl rubber dispersion; g) mixing said at least one curing agent and/or at least one pigment with said butyl rubber dispersion; h) coating a dip-formed article with said coating agent, thereby preparing a coated article; and i) drying said dip-formed article after said dip-formed article is dipped into said coagulant solution.
6. The method according to claim 5 , wherein said dip-formed article is a glove.
7. The method according to claim 5 , wherein said dip-formed article is prepared by dipping an article form into a coagulant solution, wherein said coagulant solution comprises a coagulating agent.
8. The method according to claim 5 , wherein said coagulating agent is calcium nitrate.