A process for preparing a low-molecular weight fluoropolyether containing an acid fluoride by decomposing a triflate or trifluoroacetate of a fluoropolyether having a hydroxyl group in the presence of a Lewis acid.

Disclosed are a multifunctionalized polyethylene glycol derivative and a preparation method therefor. The derivative has an H-shaped structure as represented by formula (1) and comprises one linear core LPEG and four PEG branch chains, where n.sub.1, n.sub.2, n.sub.3, and n.sub.4 respectively are the degrees of polymerization of the branch chains, U.sub.1 and U.sub.2 are trivalent branching groups connecting the core LPEG to two of the PEG branch chains, F.sub.1 and F.sub.2 contain a functional group or a protected form R.sub.01 thereof and may or may not contain a branched group G, correspondingly, the number of R.sub.01 is one or more, F.sub.1 and F.sub.2 are either identical or different, any one linking group in the molecule or any linking group formed with an adjacent heteroatom group can either remain stable or be degraded, and any one PEG segment in the molecule is discretely polydispersed or monodispersed. The multifunctional polyethylene glycol is flexible and diverse in terms of branch structures and the lengths of branching arms, has various parameters and performance indicators that are adjustable and easy to control, and has a broad applicability.

Disclosed are a multifunctionalized polyethylene glycol derivative and a preparation method therefor. The derivative has an H-shaped structure as represented by formula (1) and comprises one linear core LPEG and four PEG branch chains, where n.sub.1, n.sub.2, n.sub.3, and n.sub.4 respectively are the degrees of polymerization of the branch chains, U.sub.1 and U.sub.2 are trivalent branching groups connecting the core LPEG to two of the PEG branch chains, F.sub.1 and F.sub.2 contain a functional group or a protected form R.sub.01 thereof and may or may not contain a branched group G, correspondingly, the number of R.sub.01 is one or more, F.sub.1 and F.sub.2 are either identical or different, any one linking group in the molecule or any linking group formed with an adjacent heteroatom group can either remain stable or be degraded, and any one PEG segment in the molecule is discretely polydispersed or monodispersed. The multifunctional polyethylene glycol is flexible and diverse in terms of branch structures and the lengths of branching arms, has various parameters and performance indicators that are adjustable and easy to control, and has a broad applicability.

The present invention relates to a process for the synthesis of partially and fully fluorinated polyether (PFPE) polymers, to PFPE polymers obtained therefrom and to the use of said PFPE polymers as intermediate compounds for the manufacture of additives for plastic and glass coating.

The present invention provides, among other things, methods for preparing functionalized and other polymers from polymer alcohols such as poly(ethylene glycol)s. In addition, polymer compositions, conjugates, polymeric reagents, are also provided.

The present invention provides, among other things, methods for preparing functionalized and other polymers from polymer alcohols such as poly(ethylene glycol)s. In addition, polymer compositions, conjugates, polymeric reagents, are also provided.

The present invention provides, among other things, methods for preparing functionalized and other polymers from polymer alcohols such as poly(ethylene glycol)s. In addition, polymer compositions, conjugates, polymeric reagents, are also provided.

A process for the reduction of the content of a compound I of general formula (II)

##STR00001##

where R1 is hydrogen or methyl, each R2, independently from each other, is hydrogen or methyl, R3 is hydrogen or an aliphatic or cycloaliphatic or aromatic hydrocarbon with 1-8 carbon atoms, AO is a C2-C12 oxyalkylene group, x=0 or 1, and n=2-350, from a mixture including or consisting of a compound I of general formula (II) and an alkoxylated alcohol A of general formula (I)

##STR00002##

where R1, R2, R3, AO, x, and n are as described in general formula (II) above, characterized in that the process includes a treatment of the mixture including or consisting of a compound I and an alkoxylated alcohol A with an acid. Also, the use of the alkoxylated alcohols A for the production of polycarboxylate ethers.

A process for the reduction of the content of a compound I of general formula (II)

##STR00001##

where R1 is hydrogen or methyl, each R2, independently from each other, is hydrogen or methyl, R3 is hydrogen or an aliphatic or cycloaliphatic or aromatic hydrocarbon with 1-8 carbon atoms, AO is a C2-C12 oxyalkylene group, x=0 or 1, and n=2-350, from a mixture including or consisting of a compound I of general formula (II) and an alkoxylated alcohol A of general formula (I)

##STR00002##

where R1, R2, R3, AO, x, and n are as described in general formula (II) above, characterized in that the process includes a treatment of the mixture including or consisting of a compound I and an alkoxylated alcohol A with an acid. Also, the use of the alkoxylated alcohols A for the production of polycarboxylate ethers.

A method for producing a fluoropolyether group-containing compound, which includes reacting a fluoropolyether group-containing compound (A) represented by the formula (1) with a compound (C) represented by any of the formulae (c1) to (c4) in the presence of a metal catalyst including at least one selected from Pd, Cu, Ni, Pt, and Ag. The symboles are as defined herein.

##STR00001##