The invention relates to a silyl terminated prepolymer and to a curable composition containing this prepolymer. These compositions are used to make sealants, coatings or adhesives useful in the field of construction, public works and civil engineering.

One aspect of the present invention is a hot melt composition containing a silane coupling agent, a thermoplastic polymer, a softener, and a catalyst, wherein the silane coupling agent is hydrolyzed to a compound having a boiling point of 70 to 180° C.

A transparent sealing compound, in particular for use in a wall penetration of lines or in a splice site of a cable set. In order to have greater flexibility the sealing compound consists of a radiation crosslinked, in particular UV-crosslinked, poly (alkyl acrylate). The sealing compound is crosslinked such that its elongation amounts to more than 1000% for a material thickness of 1.5 mm according to ISO 527-2/1BA/300 and its shear strength is less than 1000 min according to DIN EN 1943 (tested per method A, 625 mm.sup.2 contact surface area).

Nail sealable materials comprising a matrix material and bentonite embedded within the matrix material are described herein in accordance with non-limiting embodiments of the present disclosure. In some embodiments, the nail sealable material comprises a sufficient amount of bentonite, such that the nail sealable material passes ASTM D1970 at a specified nail sealable material test thickness. Some embodiments relate to systems and methods utilizing the nail sealable materials described herein.

A sealant for an electrochemical device contains (A) a polyisobutylene polymer and (B) a conjugated diene polymer. The sealant contains the (A) polyisobutylene polymer in a proportion of more than 60 mass % and not more than 98 mass % and the (B) conjugated diene polymer in a proportion of not less than 2 mass % and less than 40 mass % relative to the total mass of the (A) polyisobutylene polymer and the (B) conjugated diene polymer.

Provided is a rubber composition for sealing material which contains 100 parts by mass of a rubber component, 50 to 140 parts by mass of silica, 1 to 20 parts by mass of a silane coupling agent, and 15 to 35 parts by mass of carbon black. The rubber component is preferably an ethylene-propylene-diene rubber.

[Object] An object of the present invention is to provide a thermoplastic elastomer composition with excellent heat aging resistance and also excellent hardness and mechanical properties as well as excellent moldability.

[Solution] A thermoplastic elastomer composition (I) including a cross-linked product of an ethylene.α-olefin.nonconjugated polyene copolymer (A) with a phenolic resin cross-linking agent (E), and 360 to 460 parts by mass of a crystalline polyolefin (B), 70 to 140 parts by mass of a softener (C), and 2 to 6 parts by mass of a lubricant (D) (provided that the amount of the copolymer (A) is 100 parts by mass).

A sealant for an electrochemical device contains (A) a conjugated diene polymer and (B) a polyisobutylene polymer. The sealant contains the (A) conjugated diene polymer in a proportion of more than 80 mass % and not more than 98 mass % and the (B) polyisobutylene polymer in a proportion of not less than 2 mass % and less than 20 mass % relative to the total mass of the (A) conjugated diene polymer and the (B) polyisobutylene polymer.

An aspect of the present invention is an acrylic rubber containing only an alkyl acrylate, ethylene and a crosslinking monomer as monomer units, wherein a content of a polyvinyl alcohol in the acrylic rubber is 0.5 to 2% by mass.

A rheology control agent for a curable composition may include: a diamide compound (A) and/or a hydrogenated castor oil (A′), the diamide compound (A) being obtained by condensation reaction between a diamine component (A1) and a monocarboxylic acid component (A2); and a polyamide compound (B) obtained by polycondensation of an amine component (B1) and a carboxylic acid component (B2). The diamine component (A1) may be selected from the group consisting of diamines with 2 to 12 carbon atoms. The monocarboxylic acid component (A2) may be selected from the group consisting of hydrogenated castor oil fatty acids and linear saturated fatty acids. The polyamide compound (B) may have a weight-average molecular weight from 2,000 to 21,000. A cured product of the curable composition may be used for a sealant or an adhesive.