SOFT POLYOLEFIN COMPOSITION
    1.
    发明申请

    公开(公告)号:US20250059362A1

    公开(公告)日:2025-02-20

    申请号:US18720986

    申请日:2022-12-12

    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.

    PROCESS FOR PREPARING POLYBUTENE COMPOSITIONS HAVING INCREASED CRYSTALLIZATION TEMPERATURE

    公开(公告)号:US20250051546A1

    公开(公告)日:2025-02-13

    申请号:US18719153

    申请日:2022-12-12

    Abstract: A process for producing a polybutene-1 composition including the step of:
    blending A) from 99.5 to 99.9% by weight, with respect to the total weight of A)+B), of a butene-1 polymer which is brought to a molten state or maintained in a molten state during the blending step; and B) from 0.1 to 0.5% by weight, with respect to the total weight of A)+B), of an alkanoyl hydrazine; wherein the resulting polybutene-1 composition, having a crystallization temperature TcC satisfying the following relation: T c C ≥ T c A + 5 where TcA is the crystallization temperature of the butene-1 polymer A).

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