Composition comprising encapsulated substrate with thermoplastic polymer overcoating
First Claim
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1. An encapsulated particulate composition comprising:
- (a) a solid particulate substrate;
(b) a coating substantially free of pinholes comprising an ionically and convalently crosslinked neutralized sulfonated elastomeric polymer having a thickness of at least about 1 micron deposited on the surface of particles of said substrate, wherein said crosslinked neutralized sulfonated polymer encapsulates said substrate, wherein said crosslinked neutralized sulfonated polymer is permeable to said substrate at conditions of use and said crosslinked neutralized sulfonated polymer is non-reactive to said substrate, and(c) a layer of thermoplastic polymer overcoating said coating.
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Abstract
An encapsulated breaker chemical composition used in an oil or gas stimulation operation which comprises: a breaker chemical; and a pinhole free coating of an ionically and covalently crosslinked neutralized sulfonated elastomeric polymer of about 2 to about 80 microns thick deposited onto the surface of the breaker chemical, wherein said polymer encapsulates the breaker chemical, wherein the polymer is permeable to the breaker chemical and the polymer is non-reactive to the breaker chemical.
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Citations
6 Claims
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1. An encapsulated particulate composition comprising:
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(a) a solid particulate substrate; (b) a coating substantially free of pinholes comprising an ionically and convalently crosslinked neutralized sulfonated elastomeric polymer having a thickness of at least about 1 micron deposited on the surface of particles of said substrate, wherein said crosslinked neutralized sulfonated polymer encapsulates said substrate, wherein said crosslinked neutralized sulfonated polymer is permeable to said substrate at conditions of use and said crosslinked neutralized sulfonated polymer is non-reactive to said substrate, and (c) a layer of thermoplastic polymer overcoating said coating. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification