Provided are a fluororubber composition maintaining rubber properties and excellent in flowability and mold releasability as well as capable of reducing a cross-linking time when molded, and a fluororubber sealing material formed of the fluororubber composition. The fluororubber composition contains a polyol cross-linkable based fluororubber; an aliphatic acid amide based compound; at least one member selected from a phosphoric acid ester based compound, an aliphatic acid ester based compound and a fluorine-containing based compound; and a polyol based cross-linking agent. The fluororubber sealing material is formed of the fluororubber composition.

Provided are a fluororubber composition maintaining rubber properties and excellent in flowability and mold releasability as well as capable of reducing a cross-linking time when molded, and a fluororubber sealing material formed of the fluororubber composition. The fluororubber composition contains a polyol cross-linkable based fluororubber; an aliphatic acid amide based compound; at least one member selected from a phosphoric acid ester based compound, an aliphatic acid ester based compound and a fluorine-containing based compound; and a polyol based cross-linking agent. The fluororubber sealing material is formed of the fluororubber composition.

Provided are a fluororubber composition maintaining rubber properties and excellent in flowability and mold releasability as well as capable of reducing a cross-linking time when molded, and a fluororubber sealing material formed of the fluororubber composition. The fluororubber composition contains a polyol cross-linkable based fluororubber; an aliphatic acid amide based compound; at least one member selected from a phosphoric acid ester based compound, an aliphatic acid ester based compound and a fluorine-containing based compound; and a polyol based cross-linking agent. The fluororubber sealing material is formed of the fluororubber composition.

[Problem] Provided is a resin composition, resin sheet, prepreg and printed wiring board capable of obtaining excellent low permittivity, low dielectric loss tangent, flexibility and peel strength.

[Solution Means] A resin composition containing (A) a maleimide compound exhibiting a relative permittivity of lower than 2.7, (B) a polyphenylene ether compound represented by general formula (1) below and having a number-average molecular weight of 1000 to 7000, and (C) a block copolymer with a styrene skeleton. In general formula (1), X represents an aryl group, —(Y—O)n.sub.2- represents a polyphenylene ether portion, R.sub.1, R.sub.2 and R.sub.3 each independently represent a hydrogen atom or an alkyl, alkenyl or alkynyl group, n.sub.2 represents an integer of 1 to 100, n.sub.1 represents an integer of 1 to 6 and n.sub.3 represents an integer of 1 to 4.

##STR00001##

[Problem] Provided is a resin composition, resin sheet, prepreg and printed wiring board capable of obtaining excellent low permittivity, low dielectric loss tangent, flexibility and peel strength.

[Solution Means] A resin composition containing (A) a maleimide compound exhibiting a relative permittivity of lower than 2.7, (B) a polyphenylene ether compound represented by general formula (1) below and having a number-average molecular weight of 1000 to 7000, and (C) a block copolymer with a styrene skeleton. In general formula (1), X represents an aryl group, —(Y—O)n.sub.2- represents a polyphenylene ether portion, R.sub.1, R.sub.2 and R.sub.3 each independently represent a hydrogen atom or an alkyl, alkenyl or alkynyl group, n.sub.2 represents an integer of 1 to 100, n.sub.1 represents an integer of 1 to 6 and n.sub.3 represents an integer of 1 to 4.

##STR00001##

A polyphenylene ether-based resin composition includes 25 to 84 mass % of a polyphenylene ether (A), 1 to 20 mass % of a styrene-based thermoplastic elastomer (B), 4 to 25 mass % of a flame retardant (C), and 11 to 30 mass % of a kaolin clay (D) when a total content of these four components is taken as 100 mass %. The (C) component contains, per 100 mass % of the (C) component, 0 to 97 mass % of an organophosphorus flame retardant (C-1) having a 10-mass % reduction temperature 380 to 430° C., and 100 to 3 mass % of an organophosphorus flame retardant (C-2) having a 10-mass % reduction temperature 330 to 360° C. The 10-mass % reduction temperature is determined from a heating loss curve obtained by heating about 10 mg of the (C-1) or (C-2) component from 30° C. to 800° C. at 10° C./min under a nitrogen atmosphere in a TGA measurement apparatus.

A moisture-curable composition having flame retardant properties and to the use thereof as an adhesive, sealant or coating. The composition according to the invention contains at least one moisture-reactive polymer in a proportion of 10% to 50% by weight, at least one precipitated, surface-coated aluminum trihydrate in a proportion of 30% to 60% by weight and in preferred embodiments up to 25% by weight of at least one phosphorus-containing compound and up to 20% by weight of at least one carbon additive. The inventive moisture-curable composition has excellent flame retardant properties and after curing remains resistant for a long time at high heat levels.

A moisture-curable composition having flame retardant properties and to the use thereof as an adhesive, sealant or coating. The composition according to the invention contains at least one moisture-reactive polymer in a proportion of 10% to 50% by weight, at least one precipitated, surface-coated aluminum trihydrate in a proportion of 30% to 60% by weight and in preferred embodiments up to 25% by weight of at least one phosphorus-containing compound and up to 20% by weight of at least one carbon additive. The inventive moisture-curable composition has excellent flame retardant properties and after curing remains resistant for a long time at high heat levels.

A moisture-curable composition having flame retardant properties and to the use thereof as an adhesive, sealant or coating. The composition according to the invention contains at least one moisture-reactive polymer in a proportion of 10% to 50% by weight, at least one precipitated, surface-coated aluminum trihydrate in a proportion of 30% to 60% by weight and in preferred embodiments up to 25% by weight of at least one phosphorus-containing compound and up to 20% by weight of at least one carbon additive. The inventive moisture-curable composition has excellent flame retardant properties and after curing remains resistant for a long time at high heat levels.

A halogen-free flame retardant thermoplastic polyurethane elastomer composition and product and flame retardant package thereof comprised thermoplastic polyurethane and halogen-free flame retardant package. The halogen-free flame retardant comprises inorganic phosphorus-based flame retardant and can further comprise expandable graphite, melamine or derivatives thereof and organic phosphorus-based flame retardant. The composition is environmentally friendly and safe, the comprehensive mechanical properties thereof are excellent, does not drip during the burning test, passed UL94 with rating of V0−1.5 mm, and the limiting oxygen index thereof can be up to 35%.