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US 9,783,656 B2Granted
Surface treatment of particles and their use
AssigneesEvonik Degussa GmbH, Huntsman P&A Germany GmbH
InventorsKathrin Lehmann, Frauke Henning, Christian Mund, Bernd Rohe, Petra Fritzen, Joerg Hocken
Life of this patent
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Abstract
Surface treatment of titanium dioxide, barium sulfate, zinc sulfide, and/or lithopone particles, and mixtures of said particles with specific alkoxylated siloxanes for the improvement of dispersion in plastics.
Claims21
A surface-treated particle obtained by a process for treating a surface of a primary particle, comprising contacting the primary particle with at least one compound of formula (I)
- wherein
- R identically or differently is R1, methyl, or hydroxyl,
- R1 identically or differently is a polyether moiety of formula (III)
- —Z—(O—CmH2m−(n−1))o—[O-(AO)r—R3]n (III),
- wherein
- Z is a branched alkylene moiety or an unbranched alkylene moiety having from 2 to 4 carbon atoms,
- m is from 2 to 4,
- n is from 1 to 3,
- o is 0 or 1,
- AO identically or differently is an oxyalkylene moiety comprising an oxyethylene moiety, an oxypropylene moiety, and/or an oxybutylene moiety,
- R3 identically or differently is hydrogen or an alkyl moiety having from 1 to 4 carbon atoms,
- with the proviso that in R1 a total number of carbon atoms and oxygen atoms is at least 70,
- with the proviso that r has a value that, taken together with m and n, provides said group R1 with a total number of carbon atoms and oxygens atoms of at least 70,
- a is from 20 to 200, b is from 1 to 50,
- with the proviso that if none of moieties R is R1, b is at least 3,
- wherein 0.01 to 2% by weight of the compound of the formula (I) is contacted with the primary particle, based on a mass of the primary particle to be treated, and
- wherein the surface-treated particle is a TiO2 particle, a BaSO4 particle, a ZnS particle, and/or a lithopone particle.
14 more elements
A process for treating a surface of a primary particle, comprising:
- contacting the primary particle with at least one compound of formula (I)
- wherein
- R identically or differently is R1, methyl, or hydroxyl,
- R1 identically or differently is a polyether moiety of formula (III)
- —Z—(O—CmH2m−(n−1))o—[O-(AO)r—R3]n (III),
- wherein
- Z is a branched alkylene moiety or an unbranched alkylene moiety having from 2 to 4 carbon atoms,
- m is from 2 to 4,
- n is from 1 to 3,
- o is 0 or 1,
- AO identically or differently is an oxyalkylene moiety comprising an oxyethylene moiety, an oxypropylene moiety, and/or an oxybutylene moiety,
- R3 identically or differently is hydrogen or an alkyl moiety having from 1 to 4 carbon atoms,
- with the proviso that in R1 a total number of carbon atoms and oxygen atoms is at least 70,
- with the proviso that r has a value that, taken together with m and n, provides said group R1 with a total number of carbon atoms and oxygens atoms of at least 70,
- a is from 20 to 200,
- b is from 1 to 50,
- with the proviso that if none of moieties R is R1, b is at least 3,
- wherein 0.01 to 2% by weight of the compound of the formula (I) is contacted with the primary particle, based on a mass of the primary particle to be treated, and
- wherein the primary particle is a TiO2 particle, a BaSO4 particle, a ZnS particle, and/or a lithopone particle.
16 more elements
Dependencies are inferred from the claim text.