Polymer composition and uses thereof

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 53/00 (2006.01) C08F 297/02 (2006.01) C08L 33/00 (2006.01) C08L 53/02 (2006.01)

Patent

CA 2480844

The present invention concerns a polymer composition comprising: a block copolymer (a) including a polymer block A, which is composed mainly of an .alpha.-methylstyrene, and a hydrogenated or unhydrogenated polymer block B, which is composed of a conjugated diene or isobutylene and has a weight average molecular weight of 30,000 to 200,000; an acrylic resin (b); and a softener (c), wherein proportions (by mass) of the respective components in the polymer composition are such that each of the following relationships (1) and (2) holds: 0.05 <=5 Wb/Wa <= 2 (1) and Wc/(Wa + Wb + Wc) <= 0.5 (2) wherein Wa, Wb, and Wc represent amounts (by mass) of the block copolymer (a), the acrylic resin (b) and the softener (c), respectively. The polymer composition obtainable in accordance with the present invention is favorable in terms of such physical properties as formability, scratch resistance, abrasion resistance, flexibility, mechanical strength, rubber elasticity, and transparency and exhibits these properties in a well-balanced manner. By exploiting these favorable properties, the polymer composition can be effectively used in a wide range of applications, including stretchable materials, laminates, and foams.

L'invention concerne une composition polymère comprenant (a) un polymère séquencé qui comprend un polymère séquencé (A) essentiellement constitué de .alpha.-méthylstyrène, et un polymère séquencé (B) éventuellement hydrogéné constitué d'un diène conjugué ou d'un isobutylène conjugué et présentant une masse moléculaire moyenne pondérale comprise entre 30 000 et 200 000; (b) une résine acrylique; et (c) un plastifiant dans des proportions (en masse) propres à satisfaire les relations (1) et (2): 0,05 <= Wb/Wa <= 2 (1) et Wc/(Wa + Wb + Wc) <= 0,5 (2); Wa, Wb et Wc représentant les contenus (en masse) des composants (a), (b) et (c), respectivement. La composition décrite dans cette invention présente d'excellentes propriétés, parmi lesquelles, l'aptitude au traitement par moulage, la résistance aux griffures, la résistance à l'usure, la souplesse, les résistances mécaniques, l'élasticité caoutchoutique, et la transparence; elle présente également un équilibre de ces propriétés; de plus, grâce à ses excellentes propriétés, elle peut être avantageusement utilisée dans divers domaines, tels que l'étirement d'un matériau, d'un laminé et d'une mousse.

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