Cyclotrisiloxanes, new siloxane polymers and their preparation
AssigneeUniversity of Southern California
InventorsJyri Kalevi Paulasaari, William P. Weber
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Abstract
This invention relates to methods for the preparation of hyperbranched siloxane polymers by anionic polymerization of a cyclotrisiloxane having the functional group Si—OH, and for the preparation of linear siloxane polymers by cationic or anionic polymerization of a cyclotrisiloxane having a vinylterminated functional group. Furthermore, this invention concerns novel cyclotrisiloxanes useful for the preparation of the aforementioned polymers.
Claims12
A cyclotrisiloxane of the formula (I)
- wherein Y is OSi(R)2H, OSi(R)2OH, or O—Si(R)2—OSi(R)2—CH═CH2, and the R substituents can be the same or different, any R substituent being selected from the group consisting of phenyl, an unsubstituted or substituted alkyl of 1 to 6 carbon atoms, wherein the optional substituent is a phenyl or one or more fluoro atoms, provided that the alpha or beta position of the alkyl chain cannot be fluorosubstituted.
A method for the preparation of a hyperbranched siloxane polymer, wherein a compound of formula (II)
- wherein Y is OH or OSi(R)2OH, and the R substituents can be the same or different, any R substituent being selected from the group consisting of phenyl, an unsubstituted or substituted alkyl of 1 to 6 carbon atoms, wherein the optional substituent is a phenyl or one or more fluoro atoms, provided that the alpha or beta position of the alkyl chain cannot be fluorosubstituted
- is subjected to anionic polymerization, in bulk or in a suitable solvent, to give a hyperbranched polymer, which has the formula (IIIa1, IIIa2, IIIa3) or (IIIb1, IIIb2, IIIb3)
- wherein the substituents R are as defined above and where each Z in IIIa1-a3 is one of the groups IIIa1-a3, and each Z in IIIb1-b3 is one of the groups IIIb1-b3, or Z is an endcapping group, which is the same or different, and which is hydrogen or a radical derived from a halosilane or a halosiloxane, wherein said halosilane or halosiloxane can bear finctional or non-functional groups.
A method for the preparation of a linear siloxane polymer, wherein a compound of the formula (IV)
- wherein Y is O—Si(R)2—OSi(R)2—CH═CH2, and the R substituents can be the same or different, any R substituent being selected from the group consisting of phenyl, an unsubstituted or substituted alkyl of 1 to 6 carbon atoms, wherein the optional substituent is a phenyl or one or more fluoro atoms, provided that the alpha or beta position of the alkyl chain cannot be fluorosubstituted,
- is subjected to cationic or anionic polymerization to give a linear polymer, which has the formula (V)
- wherein the substituents R are the same as in compound (IV) and m is 3 to 9000.
A linear siloxane polymer of the formula (V)
- wherein the substituents R are the same as in compound (IV) and m is 3 to 9000.
Dependencies are inferred from the claim text.