Back to results
US 12,428,560 B2Granted
Hydrophilic cyclodextrin-containing silicone gels
AssigneeWacker Chemie AG
InventorsAmitabha Mitra, Sarah Burke, Feng Wang, Christian Hartman, Margaret Whitton, Chelsea Grimm
Life of this patent
Estimating the term…
Abstract
Solvent-swollen crosslinked silicone gels containing covalently bonded cyclodextrin groups are prepared by hydrosilylation. The swollen gels are storage stable, compatible with water and polar solvents, and display a significant water break effect.
Claims20
A solvent-swollen, creamy hydrophilic silicone gel composition comprising:
- a crosslinked silicone elastomer containing at least one covalently bonded cyclodextrin moiety, prepared by hydrosilylative crosslinking of reactants (A), (B), and (C)
- (A) optionally, a cyclodextrin reactant comprising a cyclodextrin or cyclodextrin derivative which has been modified to contain an organic group containing aliphatic unsaturation or an organic group containing silicon-bonded hydrogen;
- (B) optionally, an organopolysiloxane having at least one aliphatically unsaturated group;
- wherein reactant (B) is not optional when reactant (A) is not present or where reactant (A) contains no aliphatic unsaturation;
- (C) an organopolysiloxane containing at least one silicon-bonded hydrogen atom,
- the hydrosilylative crosslinking being effected by hydrosilylating aliphatically unsaturated groups of reactant (A), when present, and reactant (B), by means of silicon-bonded hydrogen atoms of reactant (A), when present, and reactant (C), in the presence of a hydrosilylation catalyst (D), wherein at least one cyclodextrin moiety is present among reactants (A), (B), and (C),
- and wherein the hydrosilylative crosslinking is conducted in the presence of a swelling solvent (E), forming a solvent-swollen creamy hydrophilic silicone gel, or wherein the hydrosilylative crosslinking is conducted without swelling solvent and a crosslinked elastomer formed in the hydrosilylative crosslinking is dispersed into a swelling solvent (E) to form a solvent-swollen, creamy hydrophilic silicone gel.
4 more elements
A solvent-swollen, hydrophilic silicone gel composition comprising:
- a crosslinked silicone elastomer containing at least one covalently bonded cyclodextrin moiety, prepared by hydrosilylative crosslinking of reactants (A), (B), and (C)
- (A) optionally, a cyclodextrin reactant comprising a cyclodextrin or cyclodextrin derivative which has been modified to contain an organic group containing aliphatic unsaturation or an organic group containing silicon-bonded hydrogen;
- (B) optionally, an organopolysiloxane having at least one aliphatically unsaturated group;
- wherein reactant (B) is not optional when reactant (A) is not present or where reactant (A) contains no aliphatic unsaturation;
- (C) an organopolysiloxane containing at least one silicon-bonded hydrogen atom, the hydrosilylative crosslinking being effected by hydrosilylating aliphatically unsaturated groups of reactant (A), when present, and reactant (B), by means of silicon-bonded hydrogen atoms of reactant (A), when present, and reactant (C), in the presence of a hydrosilylation catalyst (D), wherein at least one cyclodextrin moiety is present among reactants (A), (B), and (C),
- and wherein the hydrosilylative crosslinking is conducted in the presence of greater than 40 weight percent of a swelling solvent (E), forming a swollen hydrophilic silicone gel, containing said swelling solvent.
3 more elements
Dependencies are inferred from the claim text.