The present invention relates to a perfluoropolyether group-containing silane compound represented by formula (1): Rf—X.sup.1—X.sup.2—NQ.sub.kT.sub.2-k, (1), and a method for preparing the same. The present invention also relates to a perfluoropolyether group-containing silane compound represented by formula (2), ##STR00001##
and a method for preparing the same. The present invention also relates to a perfluoropolyether group-containing silane compound represented by formula (3), ##STR00002##
and a method for preparing the same. The perfluoropolyether group-containing silane compound of the present invention can be used for a surface treatment agent so that the substrates such as glass etc processed by the surface treatment agent are excellent in anti-fouling, anti-fingerprint, scrape resistant and abrasion resistant performances. Moreover, the preparation method of each of the compounds of the present invention is simple in process, easy to operate and implement.

The present invention relates to novel (per)fluoropolyether (PFPE) polymer derivatives, a method for their manufacture and their use as intermediates for the synthesis of a variety of functional derivatives, including notably silane-group containing derivatives.

The present invention relates to a polymer of the aromatic polyether type, containing a biosourced furan diol, to a method for producing said polymer, and to the use of said polymer for producing membranes.

Processes for producing a fluorinated ether compound are provided by which fluorinated ether compound capable of imparting excellent water/oil repellency, to a substrate surface or a hard coat layer can be easily produced in high yield. A process comprising reacting R.sup.f(CF.sub.2).sub.a—CF.sub.2OC(═O)R.sup.f4 or R.sup.f(CF.sub.2).sub.a—C(═O)X.sup.1 with HN(—R.sup.1CH═CH.sub.2).sub.2 to obtain R.sup.f(CF.sub.2).sub.a—C(═O)N(—R.sup.1CH.sub.2═CH.sub.2).sub.2 and a process comprising obtaining the above product and reacting the product with HSiR.sup.2.sub.nL.sub.3−n to obtain R.sup.f(CF.sub.2).sub.a—C(═O)N(—R.sup.1CH.sub.2CH.sub.2SiR.sup.2.sub.nL.sub.3−n).sub.2 wherein R.sup.f is a linear polyfluoroalkyl group having at least two carbon atoms and at least one etheric oxygen atom between carbon atoms, R.sup.f4 is a C.sub.1-30 perfluoroalkyl group or the like, X.sup.1 is a halogen atom, R.sup.1 is an alkylene group, a is an integer of from 1 to 5, R.sup.2 is a monovalent hydrocarbon group, L is a hydrolyzable group, and n is an integer of from 0 to 2.

A polyether group-containing compound of the formula (I). In each of the compound of the formula (I), one or two R— are represented by (Rf—X.sup.f1-PE-X.sup.f2).sub.α—X.sup.1—, and one or two R— are represented by R.sup.Si—. The symbols are as defined in the description.

##STR00001##

The present invention relates to a process for the synthesis of partially and fully fluorinated polyether (PFPE) polymers comprising cyclic moieties in the backbone chain, 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 relates to a method for the synthesis of certain perfluoropolyether polymers having well-defined recurring units structure, and whereas the fraction of reactive end groups can be easily tuned.

Processes for producing a fluorinated ether compound are provided by which fluorinated ether compound capable of imparting excellent water/oil repellency, to a substrate surface or a hard coat layer can be easily produced in high yield. A process comprising reacting R.sup.f(CF.sub.2).sub.a—CF.sub.2OC(═O)R.sup.f4 or R.sup.f(CF.sub.2).sub.a—C(═O)X.sup.1 with HN(—R.sup.1CH═CH.sub.2).sub.2 to obtain R.sup.f(CF.sub.2).sub.a—C(═O)N(—R.sup.1CH.sub.2═CH.sub.2).sub.2 and a process comprising obtaining the above product and reacting the product with HSiR.sup.2.sub.nL.sub.3-n to obtain R.sup.f(CF.sub.2).sub.a—C(═O)N(—R.sup.1CH.sub.2CH.sub.2SiR.sup.2.sub.nL.sub.3-n).sub.2 wherein R.sup.f is a linear polyfluoroalkyl group having at least two carbon atoms and at least one etheric oxygen atom between carbon atoms, R.sup.f4 is a C.sub.1-30 perfluoroalkyl group or the like, X.sup.1 is a halogen atom, R.sup.1 is an alkylene group, a is an integer of from 1 to 5, R.sup.2 is a monovalent hydrocarbon group, L is a hydrolyzable group, and n is an integer of from 0 to 2.

To provide a water/oil repellent layer-provided substrate having a water/oil repellent layer excellent in abrasion resistance, a deposition material and a method for producing a water/oil repellent layer-provided substrate.

The water/oil repellent layer-provided substrate of the present invention is a water/oil repellent layer-provided substrate comprising a substrate, an undercoat layer and a water/oil repellent layer in this order, wherein the water/oil repellent layer comprises a condensate of a fluorinated compound having a reactive silyl group, the undercoat layer contains an oxide containing silicon and an alkaline earth metal element, and the ratio of the molar concentration of the alkaline earth metal element in the undercoat layer to the molar concentration of silicon in the undercoat layer is from 0.005 to 5.

Provided is a resin film, including: a basic substance; hollow silica particles provided in the basic substance; and a surface modifying agent including an oil repellent surface modifying agent and a lipophilic surface modifying agent.