Nanocomposites Containing Crystalline Polyester and Organosilica
AssigneeCabot Corporation
InventorsDmitry Fomitchev, Hairuo Tu, Paul S. Palumbo, Samir Kumar
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Abstract
The invention provides a process for preparing core-shell composite particles comprising a polyester, polymerized ethylenically unsaturated silane compounds, and optionally a hydrophobic surface treatment. The invention further provides a composite particle comprising a polyester and a radically polymerized ethylenically unsaturated silane compound.
Claims45
A process for preparing core-shell composite particles comprising:
- (i) providing a solution comprising one or more polyesters and up to 10 parts by mass per part of the total amount of polyester of a first ethylenically unsaturated silane compound having alkoxysilane groups in an organic solvent;
- (ii) adding sufficient base to the solution provided in step (i) to deprotonate acid groups on the polyester in solution;
- (iii) adding water to the solution obtained in step (ii) to form an emulsion;
- (iv) distilling at least a portion of the solvent and the base from the emulsion to bring the emulsion to a pH of from 5 to 7;
- (v) adding up to 30 parts by mass per part of the total amount of polyester of a second ethylenically unsaturated silane compound having alkoxysilane groups to the emulsion;
- (vi) radically polymerizing the ethylenically unsaturated silane compound to provide a dispersion of core-shell particles;
- and
- (vii) cross-linking the polymerized ethylenically unsaturated silane compound by hydrolyzing and condensing at least a portion of the alkoxysilane groups,
- wherein the core shell composite particles are produced with at least 0.1 total parts of ethylenically unsaturated silane compound having alkoxysilane groups per part total amount of polyester.
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A composite particle comprising a core comprising an amorphous polyester, a crystalline polyester, or a mixture of an amorphous polyester and a crystalline polyester and a shell comprising a polymer or copolymer of an ethylenically unsaturated silane compound, wherein fewer than 25 mol % of the carbon in the shell is part of an ethylenically unsaturated group.
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Dependencies are inferred from the claim text.