Abstract: The invention provides compounds having the formula: wherein Rf is CnF2n+1—(CH2)m—, wherein n is 1 to 22 and m is 0, or an integer from 1 to 3; X is —CO2—, —SO3—, —CONH—, —O—, —S— a covalent bond, —SO2NR—, or —NR—, wherein R is H or C1 to C5 alkylene; Y is —CH2— wherein z is 0 or 1; and R1 is H, lower alkyl or Rf—X—Yz— with the provisos that when X is —S—, or —O—, m is 0, sand z is 0, n is ≧7 and when X is a covalent bond, m or z is at least 1, and uses thereof.

Abstract: A pressure-sensitive adhesive layer is crosslinked between carboxyl groups along one surface by polyvalent cations, thus making that surface substantially tack-free while leaving at least one broad surface of the layer tacky and pressure-sensitive. When a broad surface of the adhesive layer is thus made completely tack-free, the adhesive layer can be wound upon itself in roll form without a backing for convenient storage and shipment. Preferably a low-adhesion backsize coating covers the broad tack-free surface to insure that the adhesive layer can be unwound after prolonged storage without delaminating.

Abstract: A polyhydridosilane has a catenated silicon backbone of 9 to 4000 silicon atoms with an average number of hydrogen atoms per silicon atom in the range of 0.3 to 2.2, at least 0.1 gram of the polyhydridosilane being soluble at 20.degree. C. in 100 grams of tetrahydrofuran, toluene, or methylene chloride. The polyhydridosilane can be derivatized or it can be converted to a pyropolymer or a nitrogen-containing pyropolymer which is useful as an abrasive, ceramic, electrical, or electro-optical material.

Abstract: A pressure-sensitive adhesive layer is crosslinked between carboxyl groups along one surface by polyvalent cations, thus making that surface substantially tack-free while leaving at least one broad surface of the layer tacky and pressure-sensitive. When a broad surface of the adhesive layer is thus made completely tack-free, the adhesive layer can be wound upon itself in roll form without a backing for convenient storage and shipment. Preferably a low-adhesion backsize coating covers the broad tack-free surface to insure that the adhesive layer can be unwound after prolonged storage without delaminating.

Abstract: A polyhydridosilane has a catenated silicon backbone of 9 to 4000 silicon atoms with an average number of hydrogen atoms per silicon atom in the range of 0.3 to 2.2, at least 0.1 gram of the polyhydridosilane being soluble at 20.degree. C. in 100 grams of tetrahydrofuran, toluene, or methylene chloride. The polyhydridosilane can be derivatized or it can be converted to a pyropolymer or a nitrogen-containing pyropolymer which is useful as an abrasive, ceramic, electrical, or electro-optical material.

Abstract: A polyhydridosilane has a catenated silicon backbone of 9 to 4000 silicon atoms with an average number of hydrogen atoms per silicon atoms in the range of 0.3 to 2.2, at least 0.1 gram of the polyhydridosilane being soluble at 20.degree. C. in 100 grams of tetrahydrofuran, toluene, or methylene chloride. The polyhydridosilane can be derivatized or it can be converted to a pyropolymer or a nitrogen-containing pyropolymer which is useful as an abrasive, ceramic, electrical, or electro-optical material.

Abstract: A black sorbent thermoset foam which has been prepared by the pyrolysis of a composition comprising at least one aromatic nitrogen-containing compound having the general formula:X -- Ar -- Yin which Ar represents an aromatic nucleus on which X and Y are substituents directly attached to the nucleus, X represents a substituent having a negative Hammett sigma constant and attached to the aromatic nucleus by a nitrogen, oxygen or sulphur atom, and Y represents a substituent having a positive Hammett sigma constant and attached to the aromatic nucleus by a nitrogen atom, the substituents X and/or Y optionally forming part of a ring fused onto the aromatic nucleus, in an effective sorbtive substance for polar molecules and materials.

Abstract: A method and structure for protection of metals subject to corrosion by acidic gases. Metals are enclosed within an air-confining structure with a black sorbent thermoset foam, highly sorbtive of acidic vapors.