Block copolymer compositions, having improved mechanical properties and processability
AssigneeKraton Polymers U.S. LLC
InventorsGert Joly, Jacques Moerenhout, Catherine A. L. Maris, Sonja M. Oosterbosch
Life of this patent
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Abstract
A composition to be used for the manufacture of mono- or multilayer films for food-wrap applications comprising from 5 to 40 wt % of a styrenic block copolymer, a polyolefin in an amount of at least 40 wt % and optionally a resin which is compatible with the hydrogenated poly(butadiene) blocks of the styrenic block copolymer in an amount of from 0 to 25 % wt, wherein all weight percentages are relative to the weight of the complete composition; a styrenic block copolymer to be used in said composition, and mono- or multi-layer films comprising said composition.
Claims18
A composition to be used for the manufacture of mono- or multilayer films for food-wrap applications comprising from 5 to 40 wt % of a styrenic block copolymer, having a molecular structure according to the general formulae
- S−EB−(1) or (S−EB)nX(2),
- wherein each S independently is a polymer block of predominantly styrene and EB is a hydrogenated polymer block of predominantly butadiene, n is an integer equal to or greater than 2, and X is the residue of a coupling agent, having a poly(styrene) content of from 10 to 29 wt %, having poly(styrene) blocks (5) of an apparent molecular weight in the range of from 6,000 to 9,000, having an apparent molecular weight of the complete block copolymer in the range of from 80,000 to 150,000 having an 1,2-addition degree (vinyl content) in the precursor of the poly(butadiene) block (EB) in the range of from 60 to 80% (mole/mole), wherein the block EB has a hydrogenation degree of at least 80% and wherein diblock S−EB optionally occurs in a content of at most 20 mole %, a polyolefin in an amount of at least 40 wt % and optionally a resin which is compatible with the hydrogenated poly (butadiene) blocks in an amount of from 0 to 25% wt, wherein all weight percentages are relative to the weight of the complete composition.
Mono- or multilayer film comprising at least one layer based on a composition comprising from 5 to 40 wt % of a syrenic block copolymer, having a molecular structure according to the general
- S−EB−S(1) or (S−EB)nX(2),
- wherein each S independently is a polymer block of predominantly styrene and EB is a hydrogenated polymer block of predominantly butadiene, n is an integer equal to or greater than 2, and X is the residue of a coupling agent, having a poly(styrene) content of from 10 to 29 wt %, having poly(styrene) blocks (S) of an apparent molecular weight in the range of from 6,000 to 9,000, having an apparent molecular weight of the complete block copolymer in the range of from 80,000 to 150,000 having an 1,2-addition degree (vinyl content) in the precursor of the poly(butadiene) block (EB) in the range of from 60 to 80% (mole/mole), wherein the block EB has a hydrogenation degree of at least 80% and wherein diblock S−EB optionally occurs in a content of most 20 mole %, a polyolefin in an amount of at least 40 wt % and optionally a resin which is compatible with the hydrogenated poly(butadiene) blocks in an amount of from 0 to 25% wt, wherein all weight percentages are relative to the weight of the complete composition.
Dependencies are inferred from the claim text.