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US 6,204,329 B1Granted
Polysiloxane-polybutylene copolymers
AssigneeDow Corning Corporation
InventorsMarie-Agnes Leboucher, Sian Rees, Anne-Marie Vincent
Life of this patent
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Abstract
A polysiloxane-polybutylene copolymer having polybutylene chains grafted onto a polysiloxane backbone which has a variety of properties which render it valuable for applications in personal care.
Claims3
A polysiloxane-polybutylene copolymer comprising polybutylene grafted onto a polysiloxane backbone, the copolymer having the formula
- RaX(3−a)Si—O—(R2SiO)q—(RXSiO)y—SiX(3−a)Ra
- wherein each R is independently selected from the group consisting of hydrogen, hydroxyl, alkoxy, halogen, siloxane units, organic groups having from 1-30 carbon atoms and substituted organic groups having from 1-30 carbon atoms, X is a polybutylene having a molecular weight greater than about 500, a is 2 or 3, q is a positive integer with a value of at least 1 and y is a positive integer with a value of at least 2, and wherein the (R2SiO) units comprise (CH3RSiO) units and (CH3ZSiO) units where Z is an organic group with 10 to 30 carbon atoms.
A polysiloxane-polybutylene copolymer comprising polybutylene grafted onto a polysiloxane backbone, the copolymer having the formula
- RaX(3−a)Si—O—(R2SiO)q—(RXSiO)y—SiX(3−a)Ra
- wherein each R is independently selected from the group consisting of hydrogen, hydroxyl, alkoxy, halogen, siloxane units, organic groups having from 1-30 carbon atoms and substituted organic groups having from 1-30 carbon atoms, X is a polybutylene having a molecular weight greater than about 500, a is 2 or 3, q is a positive integer with a value of at least 1 and y is a positive integer with a value of at least 2, and wherein the (R2SiO) units comprise (CH3ZSiO) units where Z is an organic group with 10 to 30 carbon atoms.
A polysiloxane-polybutylene copolymer comprising polybutylene grafted onto a polysiloxane backbone, the copolymer having the formula
- RaX(3−a)Si—O—(R2SiO)q—(RXSiO)y—SiX(3−a)Ra
- wherein each R is independently selected from the group consisting of hydrogen, hydroxyl, alkoxy, halogen, siloxane units, organic groups having from 1-30 carbon atoms and substituted organic groups having from 1-30 carbon atoms, X is a polybutylene having a molecular weight greater than about 500, a is 2 or 3, q is a positive integer with a value of at least 1 and y is a positive integer with a value of at least 2, and wherein at least one of the R groups comprise siloxane units for forming resinous polysiloxanes.
Dependencies are inferred from the claim text.