A coating agent for a rubber-coated cylinder head gasket contains a lubricant and a urethane resin. The lubricant is unsintered polytetrafluoroethylene resin particles having an average primary particle size of 1 m or less. The amount of the unsintered polytetrafluoroethylene resin particles in a solid content is 30 to 80% by volume. The present invention provides a coating agent for a rubber-coated cylinder head gasket that can form a coat that is highly wear-resistant under high contact pressure and high temperature conditions and with which a rubber layer is less likely to stick to the seal face of the cylinder block or the cylinder head after the use under high contact pressure and high temperature conditions, and a cylinder head gasket obtained using the coating agent.

An object of the present invention is to provide a macromolecular material that exhibits excellent elongation. The first macromolecular material of the present invention contains the first polymer containing the first structural unit and the second polymer containing the second structural unit. The first structural unit has a guest group in its side chain, and the second structural unit has a host group in its side chain. At least one of the first and the second polymers contains at least one fluorine group. The second macromolecular material of the present invention contains the first structural unit having a guest group in its side chain, the second structural unit having a host group in its side chain, and the third structural unit other than the first and second structural units. At least one of the first, the second, and the third structural units contains at least one fluorine group.

The invention provides a composition capable of providing a molded article that has excellent heat resistance and a small weight change against oxygen plasma exposure and fluorine plasma exposure during a semiconductor manufacturing step. The composition contains a fluorine-containing polymer and a hyperbranched polymer of a cage silsesquioxane with a specific structure.

Provided are a perfluoroelastomer composition which contains 100 parts by weight of a perfluoroelastomer containing a constituent unit derived from a nitrile group-containing monomer, and 0.01 to 5 parts by weight of ketjen black; and a sealing material including a crosslinked product of the perfluoroelastomer composition.

Provided is a fluoroelastomer crosslinkable composition containing: a polyol-crosslinkable fluoroelastomer (a); and a cross-linking agent (b), wherein the cross-linking agent (b) is at least one selected from the group consisting of a compound represented by the general formula (b1) set forth in the description, a compound represented by the general formula (b2) set forth in the description, and a salt of each of the compounds with an alkali metal, an alkaline earth metal, or an onium compound.

A crosslinking agent includes a compound represented by the following formula (1). In the formula (1), R.sup.1, R.sup.2, and R.sup.3 are independently a fluorine atom, an alkyl group, a fluoroalkyl group, or a substituted or unsubstituted aryl group, a plurality of R.sup.1 are identical or different, a plurality of R.sup.2 are identical or different, a plurality of R.sup.3 are identical or different, provided that at least one of R.sup.1, R.sup.2, and R.sup.3 is a fluorine atom or a fluorine atom-containing group, m is an integer of from 2 to 6, l is an integer of from 0 to 2, and each hydrogen on the benzene ring(s) is optionally substituted with a substituent. ##STR00001##

A formed body including: a polytetrafluoroethylene or a modified polytetrafluoroethylene; and an unmodified polymerization inhibitor, the content of the unmodified polymerization inhibitor being 0.02 to 15 wt %.

A fluorine-containing elastomer composition comprising 0.4 to 4.0 parts by weight of a pigment that is a perylene-based compound, a naphthalenecarboxamide-based compound, a pyrimidinetrione-based compound, or a benzimidazolone-based compound, and 0.2 to 5.0 parts by weight of a bisamidoxime compound or 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane, based on 100 parts by weight of a fluorine-containing elastomer having a copolymer composition of (A) 60.0 to 80.0 mol % of tetrafluoroethylene, (B) 19.8 to 39.8 mol % of perfluoro(lower alkyl vinyl ether) or perfluoro(lower alkoxy lower alkyl vinyl ether), and (C) 0.2 to 5.0 mol % of a perfluoro unsaturated nitrile compound.

Provided is a seal material having excellent non-adherence to metal surfaces. The seal material is formed of a cross-linked rubber that is obtained through cross-linking of a cross-linkable rubber composition containing a binary fluororubber, a carbon material, and a polyol cross-linker. The carbon material includes one or more carbon nanotubes. The cross-linked rubber has an adhesion strength of 2 N or less to a metal surface after being heated at 250? C. for 70 hours while in contact with the metal surface.

The layered product includes at least one type of layer selected from the layers (1) and (2), and at least one type of layer selected from the layers (3) and (4), in which at least one layer of the at least one type of layer selected from the layers (1) and (2) is directly in contact with or adjacent via an adhesive layer to at least one layer of the at least one type of layer selected from the layers (3) and (4): layer (1): a layer prepared using an ethylene/-olefin/non-conjugated polyene copolymer; layer (2): a layer prepared using an ethylene/carboxylic acid copolymer; layer (3): a layer prepared using an acrylic-type rubber; and layer (4): a layer prepared using a halogen-containing polymer.