A polyolefin composition having good transparency and mechanical properties comprising, all percent amounts being by weight: A) from 70 to 98% of a propylene homopolymer or copolymer having haze of 25% or less and melting temperature of 130 C. or higher; and B) from 2 to 30% of a butene-1 copolymer containing from 0.5 to 30% of one or more comonomer(s).

A polyolefin composition having good transparency and mechanical properties comprising, all percent amounts being by weight: A) from 70 to 98% of a propylene homopolymer or copolymer having haze of 25% or less and melting temperature of 130 C. or higher; and B) from 2 to 30% of a butene-1 copolymer containing from 0.5 to 30% of one or more comonomer(s).

The invention relates to a tire sidewall, at least one portion of which has a rubber composition based on at least a diene elastomer, a crosslinking system and a reinforcing filler, wherein the content of reinforcing filler in the composition varies from 20 to 40 parts by weight per hundred parts of elastomer, phr, with a volume fraction of reinforcing filler in the composition ranging from 8.0% to 13.0%, and in that this reinforcing filler comprises predominantly a carbon black or a mixture of carbon blacks with a BET specific surface area ranging from 50 m.sup.2/g to 69 m.sup.2/g.

The invention relates to a tire sidewall, at least one portion of which has a rubber composition based on at least a diene elastomer, a crosslinking system and a reinforcing filler, wherein the content of reinforcing filler in the composition varies from 20 to 40 parts by weight per hundred parts of elastomer, phr, with a volume fraction of reinforcing filler in the composition ranging from 8.0% to 13.0%, and in that this reinforcing filler comprises predominantly a carbon black or a mixture of carbon blacks with a BET specific surface area ranging from 50 m.sup.2/g to 69 m.sup.2/g.

An elastomer composition, having an excellent flexibility and low temperature durability, a method for producing the same and a pneumatic tire using the same are provided. An elastomer composition (C) comprising a matrix of a thermoplastic resin (A), in which a dispersed phase of an elastomer component (B) is finely dispersed to form an island-in-sea structure, wherein volume ratios of the thermoplastic resin (A) and the elastomer component (B) satisfy the following formula (I):
d/m>d/m(I)
wherein d and d, respectively, indicate a volume ratio and a melt viscosity of the elastomer component (B), and m and m, respectively, indicate a volume ratio and a melt viscosity of the thermoplastic resin (A)), a method for producing the same and a pneumatic tire using the same.

An elastomer composition, having an excellent flexibility and low temperature durability, a method for producing the same and a pneumatic tire using the same are provided. An elastomer composition (C) comprising a matrix of a thermoplastic resin (A), in which a dispersed phase of an elastomer component (B) is finely dispersed to form an island-in-sea structure, wherein volume ratios of the thermoplastic resin (A) and the elastomer component (B) satisfy the following formula (I):
d/m>d/m(I)
wherein d and d, respectively, indicate a volume ratio and a melt viscosity of the elastomer component (B), and m and m, respectively, indicate a volume ratio and a melt viscosity of the thermoplastic resin (A)), a method for producing the same and a pneumatic tire using the same.

This invention provides a rubber composition being excellent in the workability during production and the heat resistance and high in the storage elastic modulus (G) and small in the loss tangent (tan ), which is formed by compounding 1-60 parts by mass of a low-molecular weight conjugated diene-based polymer (B) having a weight average molecular weight as measured through a gel permeation chromatography and converted to polystyrene of 10,000-200,000 and a vinyl bond content in a conjugated diene compound portion of not less than 40% based on 100 parts by mass of a rubber component (A) comprised of at least one selected from the group consisting of natural rubber, polyisoprene rubber, styrene-butadiene copolymer rubber, polybutadiene rubber and isobutylene isoprene rubber, wherein the rubber component (A) comprises natural rubber and/or polyisoprene rubber and a proportion of styrene units in total of the low-molecular weight conjugated diene-based polymer (B) is less than 5% by mass.

This invention provides a rubber composition being excellent in the workability during production and the heat resistance and high in the storage elastic modulus (G) and small in the loss tangent (tan ), which is formed by compounding 1-60 parts by mass of a low-molecular weight conjugated diene-based polymer (B) having a weight average molecular weight as measured through a gel permeation chromatography and converted to polystyrene of 10,000-200,000 and a vinyl bond content in a conjugated diene compound portion of not less than 40% based on 100 parts by mass of a rubber component (A) comprised of at least one selected from the group consisting of natural rubber, polyisoprene rubber, styrene-butadiene copolymer rubber, polybutadiene rubber and isobutylene isoprene rubber, wherein the rubber component (A) comprises natural rubber and/or polyisoprene rubber and a proportion of styrene units in total of the low-molecular weight conjugated diene-based polymer (B) is less than 5% by mass.

PVC-free polymer compound for producing seals containing scavengers for screw caps, in particular twist crown corks, characterized in that the Shore A hardness of the polymer compound lies between 50 and 90 and, in a compression set test analogous to ASTM D395-97, Method B, the polymer compound has a compression set of between 30% and 90% after it has been left for 22 hours at 70 C. under a compression of 25%.

PVC-free polymer compound for producing seals containing scavengers for screw caps, in particular twist crown corks, characterized in that the Shore A hardness of the polymer compound lies between 50 and 90 and, in a compression set test analogous to ASTM D395-97, Method B, the polymer compound has a compression set of between 30% and 90% after it has been left for 22 hours at 70 C. under a compression of 25%.