The rubber composition of the present invention contains: a rubber component (A) containing a butadiene-based rubber and 30% by mass or more of a natural rubber; a filler (B); 30 to 55 parts by mass of a softening agent (C) relative to 100 parts by mass of the rubber component (A); and 1 to 6 parts by mass of a linear polyhydric alcohol (D) relative to 100 parts by mass of the rubber component (A), wherein the softening agent (C) contains a softening agent (C1) which has a high affinity to the natural rubber in an amount of 0 parts by mass or more and less than 15 parts by mass relative to 100 parts by mass of the rubber component (A) and contains a softening agent (C2) which has a high affinity to the butadiene-based rubber in an amount of 10 parts by mass or more relative to 100 parts by mass of the rubber component (A). From the rubber composition, a crosslinked rubber composition having a good balance between low heat generation property and crack resistance can be obtained.

A curable composition including a perfluoro(poly)ether group-containing silane compound having two or more Si atoms each bonding to at least one of a hydroxyl and hydrolyzable group, and a perfluoro(poly)ether group represented by: —(OC.sub.6F.sub.12)—(OC.sub.5F.sub.10).sub.b—(OC.sub.4F.sub.8).sub.c—(OC.sub.3X.sup.10.sub.6).sub.d—(OC.sub.2F.sub.4).sub.e—(OCF.sub.2).sub.f—, wherein a, b, c and d are each independently an integer of 0 to 30, e and f are each independently an integer of 1 to 200, the sum of a, b, c, d, e and f is at least 5, the occurrence order of respective repeating units with the subscript a, b, c, d, e or f is not limited, a ratio of e to f is less than 1.0, and each X.sup.10 is independently a hydrogen, fluorine or chlorine atom; an organosilicon compound having at least two —O—R.sup.g3(s) each bonding to a Si atom, wherein each R.sup.g3 is independently a hydrogen atom or a monovalent organic group; and a catalyst.

A curable composition including a perfluoro(poly)ether group-containing silane compound having two or more Si atoms each bonding to at least one of a hydroxyl and hydrolyzable group, and a perfluoro(poly)ether group represented by: —(OC.sub.6F.sub.12)—(OC.sub.5F.sub.10).sub.b—(OC.sub.4F.sub.8).sub.c—(OC.sub.3X.sup.10.sub.6).sub.d—(OC.sub.2F.sub.4).sub.e—(OCF.sub.2).sub.f—, wherein a, b, c and d are each independently an integer of 0 to 30, e and f are each independently an integer of 1 to 200, the sum of a, b, c, d, e and f is at least 5, the occurrence order of respective repeating units with the subscript a, b, c, d, e or f is not limited, a ratio of e to f is less than 1.0, and each X.sup.10 is independently a hydrogen, fluorine or chlorine atom; an organosilicon compound having at least two —O—R.sup.g3(s) each bonding to a Si atom, wherein each R.sup.g3 is independently a hydrogen atom or a monovalent organic group; and a catalyst.

The present invention provides a crosslinked molded article having a lower compression set; and a method for producing a crosslinked molded article by injection molding, the method enabling shortening of one cycle in injection molding, the method being suitable for obtaining a crosslinked molded article having a lower compression set. The present invention relates to a method for producing a crosslinked molded article, comprising melt-kneading a polymer composition containing a polymer having a terminal double bond, a hydrosilyl group-containing compound (Y) having at least two hydrosilyl groups per molecule, a platinum-based catalyst (Z) for hydrosilicon crosslinking, and a reaction inhibitor (D), subjecting the polymer composition to injection molding in a mold, performing primary crosslinking in the mold, removing the primary-crosslinked molded article from the mold, and then performing secondary crosslinking in a heat medium.

The present invention provides a crosslinked molded article having a lower compression set; and a method for producing a crosslinked molded article by injection molding, the method enabling shortening of one cycle in injection molding, the method being suitable for obtaining a crosslinked molded article having a lower compression set. The present invention relates to a method for producing a crosslinked molded article, comprising melt-kneading a polymer composition containing a polymer having a terminal double bond, a hydrosilyl group-containing compound (Y) having at least two hydrosilyl groups per molecule, a platinum-based catalyst (Z) for hydrosilicon crosslinking, and a reaction inhibitor (D), subjecting the polymer composition to injection molding in a mold, performing primary crosslinking in the mold, removing the primary-crosslinked molded article from the mold, and then performing secondary crosslinking in a heat medium.

A polyoxyalkylene polymer including a main chain structure of a polyoxyalkylene and terminal structures bonded to ends of the main chain structure is provided. The terminal structures include a hydrolyzable silyl group and further include a terminal olefin group and/or an internal olefin group. The total number of the hydrolyzable silyl, terminal olefin, and internal olefin groups is more than 1.0 on average per terminal structure, and the ratio of the number of moles of the hydrolyzable silyl groups to the total number of moles of the hydrolyzable silyl, terminal olefin, and internal olefin groups is from 0.3 to 0.7.

A polyoxyalkylene polymer including a main chain structure of a polyoxyalkylene and terminal structures bonded to ends of the main chain structure is provided. The terminal structures include a hydrolyzable silyl group and further include a terminal olefin group and/or an internal olefin group. The total number of the hydrolyzable silyl, terminal olefin, and internal olefin groups is more than 1.0 on average per terminal structure, and the ratio of the number of moles of the hydrolyzable silyl groups to the total number of moles of the hydrolyzable silyl, terminal olefin, and internal olefin groups is from 0.3 to 0.7.

Self-healable, omniphobic coatings and related methods are provided. In embodiments, a self-healable, omniphobic coating comprises a matrix of crosslinked, entangled hydrogel polymers, the hydrogel polymers comprising hydroxyl (OH) groups, hydroxyl group precursors, or both, and nanoparticles distributed throughout the matrix; and fluorinated silane molecules covalently bound to the matrix.

The invention relates to a preparation for producing a polymer crosslinkable by condensation reaction, which comprises at least one aminopropyltriethoxysilane and at least one polydialkylsiloxane having two terminal hydroxyl groups, wherein the polydialkylsiloxane is represented by the following formula (1):

HO—[—SiR.sub.1R.sub.2—O—].sub.x—OH  formula (1)

wherein in formula (1) R.sub.1 and R.sub.2 may be the same or different and may be selected from the group consisting of alkyl groups having 1 to 8 carbon atoms and wherein x is an integer from 30 to 2500.

The invention relates to a preparation for producing a polymer crosslinkable by condensation reaction, which comprises at least one aminopropyltriethoxysilane and at least one polydialkylsiloxane having two terminal hydroxyl groups, wherein the polydialkylsiloxane is represented by the following formula (1):

HO—[—SiR.sub.1R.sub.2—O—].sub.x—OH  formula (1)

wherein in formula (1) R.sub.1 and R.sub.2 may be the same or different and may be selected from the group consisting of alkyl groups having 1 to 8 carbon atoms and wherein x is an integer from 30 to 2500.