US 2025/0059362 A1Published application

Soft polyolefin composition

AssigneeBasell Poliolefine Italia S.r.l.

InventorsMichele Grazzi, Monica Galvan

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Abstract

A polyolefin composition made from or containing (I) 75-95 wt % of a thermoplastic polyolefin made from or containing (A) 18-30 wt % of a propylene copolymer with 1.0-6.0 wt. % of CH2═CHR comonomer, having a melt flow rate (MFR) ranging from 30 to 60 g/10 min; and (B) 70-82 wt % of a propylene copolymer with 20-35 wt. % of CH2═CHR comonomer, and optionally a diene, wherein the thermoplastic polyolefin has i) a xylene soluble fraction equal to or greater than 70 wt. %; and ii) a MFR from 0.2 to 15.0 g/10 min, and (II) 5-25 wt % of a polybutene component, having a flexural modulus equal to or lower than 60 MPa and made from or containing a butene-1 copolymer with ethylene and optionally a comonomer of formula CH2═CHR1, wherein the copolymer having i) up to and including 20 wt % of ethylene-or comonomer-derived units; and ii) Mw/Mn equal to or lower than 3.

Claims15

Dependent claims

A polyolefin composition comprising:

(I) 75-95% by weight of a thermoplastic polyolefin comprising:
(A) 18-30% by weight of a copolymer of propylene with from 1.0 to 6.0% by weight of a comonomer of formula CH2═CHR, where R is H or a linear or branched C2-C8 alkyl, based on the weight of (A), and having a melt flow rate (MFR(A)), measured according to ISO 1133 (230° C., 2.16 kg), ranging from 30 to 60 g/10 min;
and
(B) 70-82% by weight of a copolymer of propylene with from 20 to 35% by weight of a comonomer of formula CH2═CHR, and optionally a diene, where R is H or a linear or branched C2-C8 alkyl, based on the weight of (B),
wherein the thermoplastic polyolefin has
i) an amount of fraction soluble in xylene at 25° C. (XS(I)) equal to or greater than 70% by weight, based on the total weight of (A)+(B);
and
ii) a melt flow rate (MFR(I)), measured according to ISO 1133 (230° C., 2.16 kg) from 0.2 to 15.0 g/10 min, and
wherein the amounts of (A) and (B) are based on the total weight of (A)+(B);
and
(II) 5-25% by weight of a polybutene component,
having a flexural modulus equal to or lower than 60 MPa, measured according to the method ISO 178:2019 and
comprising a copolymer of butene-1 with ethylene and optionally a comonomer of formula CH2═CHR1, where R1 is methyl or a linear or branched C3-C8 alkyl,
wherein the copolymer of butene-1 having
iii) up to and including 20% by weight of units deriving from ethylene and optionally the comonomer, based on the weight of (II);
and
ii) a molecular weight distribution Mw/Mn equal to or lower than 3;
wherein the amounts of (I) and (II) are based on the total weight of (I)+(II).

15 more elements

Dependencies are inferred from the claim text.