Abstract: Provided is a hot-melt adhesive which satisfies both solidification rate and adhesiveness. A base polymer for a hot-melt adhesive which satisfies the following (1) and (2): (1) a modulus of elasticity in tension at 23° C. is 400 MPa or less; and (2) a semi-crystallization time at 23° C. is 20 minutes or less.

Abstract: Provided are an adhesive composition which has high holding strength and leaves no residual glue by using a polyolefinic polymer, and an adhesive tape using the same. A polyolefin which satisfies the following conditions (a-1), (b1), and (b2):(a-1) the relationship between the limiting viscosity and the stereoregularity is represented by the formula (i): ?20×?+56?mmmm??20×?+64 (wherein ? represents the limiting viscosity measured in tetralin at 135° C., and mmmm represents the meso pentad fraction (mol %)); (b1) the meso pentad fraction (mmmm) is from 20 to 60 mol %; and (b2) the limiting viscosity [?] measured in tetralin at 135° C. is from 0.01 to 2.0 dL/g.

Abstract: Provided are a propylene-based polymer which enhances heat creep resistance and a hot-melt adhesive having excellent heat creep resistance. A propylene-based polymer which satisfies the following (1) and (2): (1) 125?a modulus of elasticity in tension (MPa) at 23° C.?400; and (2) 100?an elongation at break (%) at 23° C.?1,000, and a hot-melt adhesive containing the propylene-based polymer in an amount of 1 to 50% by mass.

Abstract: Provided is a hot-melt adhesive which satisfies both solidification rate and adhesiveness. A base polymer for a hot-melt adhesive which satisfies the following (1) and (2): (1) a modulus of elasticity in tension at 23° C. is 400 MPa or less; and (2) a semi-crystallization time at 23° C. is 20 minutes or less.

Abstract: Provided are a propylene-based polymer which enhances heat creep resistance and a hot-melt adhesive having excellent heat creep resistance. A propylene-based polymer which satisfies the following (1) and (2): (1) 125?a modulus of elasticity in tension (MPa) at 23° C.?400; and (2) 100?an elongation at break (%) at 23° C.?1,000, and a hot-melt adhesive containing the propylene-based polymer in an amount of 1 to 50% by mass.

Abstract: Provided are an adhesive composition which has high adhesive strength and holding strength and leaves no residual glue by using a polyolefinic polymer, and an adhesive tape using the same. The adhesive composition contains (1) 5 to 95% by mass of a polyolefin having a melting point which is lower than 20° C. or is not observed by a differential scanning calorimeter (DSC) and having a ?H of less than 5 J/g, and (2) 5 to 95% by mass of a polyolefin having a melting point of 20° C. or higher and 160° C. or lower and having a ?H of 5 J/g or more and 100 J/g or less, wherein the storage elastic modulus of the composition at 25° C. obtained from the solid viscoelasticity measurement of the composition is 1 MPa or more and 200 MPa or less, and the storage elastic modulus thereof at 50° C. is 1 MPa or more and 100 MPa or less.

Abstract: Provided are an adhesive composition which has high holding strength and leaves no residual glue by using a polyolefinic polymer, and an adhesive tape using the same. A polyolefin which satisfies the following conditions (a-1), (b1), and (b2):(a-1) the relationship between the limiting viscosity and the stereoregularity is represented by the formula (i): ?20×?+56?mmmm??20×?+64 (wherein ? represents the limiting viscosity measured in tetralin at 135° C., and mmmm represents the meso pentad fraction (mol %)); (b1) the meso pentad fraction (mmmm) is from 20 to 60 mol %; and (b2) the limiting viscosity [?] measured in tetralin at 135° C. is from 0.01 to 2.0 dL/g.

Abstract: A functionalized ?-olefin polymer having an ?-olefin polymer main chain and an alkoxysilyl group and satisfying the following (a) to (d): (a) The meso-pentad fraction [mmmm] is less than 20 mol %, or the meso-diad fraction [m] is less than 95 mol %. (b) The weight-average molecular weight (Mw) is from 1,000 to 500,000. (c) The alkoxysilyl group concentration in all the monomer units is from 0.01 to 50 mol %. (d) The ?-olefin polymer is a propylene homopolymer, a 1-butene homopolymer or a propylene-1-butene copolymer.