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US 2024/0191035 A1Published application
Ring opening polymerization of cyclic siloxanes
AssigneeCht USA Inc.
InventorsBrian Patrick Mulhern, Robert William Graff
Life of this patent
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Abstract
The invention describes methods to produce high molecular weight silicones via ring opening polymerization of cyclic siloxanes in the presence of a Lewis acid catalyst.
Claims28
A method for polymerizing one or more cyclic siloxane(s) comprising:
- combining one or more cyclic siloxane(s) with a Lewis acid catalyst at a temperature of from about 20° C. to about 400° C. to form a reaction mixture, wherein the cyclic siloxane(s) comprises a formula
- wherein n is from 1 to 20 and each R, independently, is a substituted or unsubstituted C1 to a C20 alkyl group, a substituted or unsubstituted aryl group, a hydrogen atom, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted amino group, or an alkoxide;
- and
- obtaining a product from the mixture, wherein the product comprises formula (II) [(HO)R2SiO1/2]2(R2SiO2/2)m, where m>n.
1 more element
A method for polymerizing one or more cyclic siloxane(s) comprising:
- combining one or more cyclic siloxane(s) with a Lewis acid catalyst at a temperature of from about 20° C. to about 400° C. to form a reaction mixture, wherein the cyclic siloxane(s) comprises a formula
- wherein n is from 1 to 20 and each R, independently, is a substituted or unsubstituted C1 to a C20 alkyl group, a substituted or unsubstituted aryl group, a hydrogen atom, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted amino group, or an alkoxide;
- treating the reaction mixture with a nucleophilic agent, Z;
- and
- obtaining a product from the mixture, wherein the product comprises formula (III) [(HO)R2SiO1/2](R2SiO2/2)m[SiO1/2R2(Z)], wherein m>n and Z comprises an amine, an alkoxy group, a trialkylsiloxy group, an acetate, an alkyl ester, a silazanyl group, an aminosilyl group, or an amino silicone group.
2 more elements
A method for polymerizing one or more cyclic siloxane(s) comprising:
- combining one or more cyclic siloxane(s) with a Lewis acid catalyst at a temperature of from about 20° C. to about 400° C. to form a reaction mixture, wherein the cyclic siloxane(s) comprises a formula
- wherein n is from 1 to 20 and each R, independently, is a substituted or unsubstituted C1 to a C20 alkyl group, a substituted or unsubstituted aryl group, a hydrogen atom, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted amino group, or an alkoxide;
- treating the reaction mixture with an electrophilic agent, T;
- and
- obtaining a product from the mixture, wherein the product comprises formula (IV) [(TO)R2SiO1/2](R2SiO2/2)m[SiO1/2R2(OH)], wherein m>n and T comprises an electrophile.
2 more elements
A method for polymerizing one or more cyclic siloxane(s) comprising:
- combining one or more cyclic siloxane(s) with a Lewis acid catalyst at a temperature of from about 20° C. to about 400° C. to form a reaction mixture, wherein the cyclic siloxane(s) comprises a formula
- wherein n is from 1 to 20 and each R, independently, is a substituted or unsubstituted C1 to a C20 alkyl group, a substituted or unsubstituted aryl group, a hydrogen atom, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted amino group, or an alkoxide;
- treating the reaction mixture with an electrophilic agent, T and a nucleophilic agent, Z;
- and
- obtaining a product from the mixture, wherein the product comprises formula (V) [(TO)R2SiO1/2](R2SiO2/2)m[SiO1/2R2(Z)],
- wherein m>n, Z comprises an amine, an alkoxy group, a trialkylsiloxy group, an acetate, an alkyl ester, a silazanyl group, an aminosilyl group, or an amino silicone group and T comprises an electrophile.
3 more elements
The method according to claim 28, wherein the reaction temperature is from about 20° C. to about 120° C.
Dependencies are inferred from the claim text.