STYRENE-BUTADIENE BLOCK COPOLYMERS FOR TUBING APPLICATIONS

摘要

Conjugated diene monovinylarene block copolymers having superior kink resistance properties are disclosed. These copolymers can be used to produce tubing and other end-use articles, and can be a replacement for flexible PVC.

主权项

1. A conjugated diene monovinylarene block copolymer comprising from about 35 phm to about 75 phm monovinylarene monomer, and comprising polymer chains containing a block structure having formula I:
S1—(S/B)1—(S/B)2  (I); wherein: S1 is a monoblock of the monovinylarene monomer, wherein S1 is from about 10 phm to about 45 phm of the copolymer; (S/B)1 is a mixed block of the conjugated diene monomer and the monovinylarene monomer, wherein the monovinylarene monomer content is from about 30 wt. % to about 80 wt. %, based on the total weight of (S/B)1; and (S/B)2 is a mixed block of the conjugated diene monomer and the monovinylarene monomer, wherein the conjugated diene monomer content is from about 70 wt. % to about 99 wt. %, based on the total weight of (S/B)2; and wherein a kink resistance of tubing produced from the copolymer and tested in accordance with DIN EN 13868 is less than or equal to about 32 mm.