Blends of ethylenic polymers with improved modulus and melt strength and articles fabricated from these blends
A blend comprising the following components: (A) a heterogeneous or homogeneous linear ethylene homopolymer or interpolymer, and wherein the homopolymer or interpolymer has a density greater than or equal to 0.944 g/cc, and (B) a branched interpolymer formed from ethylene and at least one ±,²-ethyle...
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Zusammenfassung: | A blend comprising the following components:
(A) a heterogeneous or homogeneous linear ethylene homopolymer or interpolymer, and wherein the homopolymer or interpolymer has a density greater than or equal to 0.944 g/cc, and
(B) a branched interpolymer formed from ethylene and at least one ±,²-ethylenically unsaturated comonomer; and
wherein said blend has the following properties:
1) a melt index, 12, from 0.05 to 20 g/10 min;
2) a flexural modulus of ¥ 100,000 psi;
3) a melt strength of ¥ 2 cN at 190°C;
4) a melt extensibility of ¥ 25 mm/sec;
5) a UST greater than 115°C; and
6) wherein said melt strength of said blend meets the following inequality: Melt strength ¥ F MS * ( f * A ) + ( 1 - f ) * B ,
where A = 3.3814* (1/I2) 0.6476 and B = 10 (1.2896 - 0.4278*log10(I2)) , I2 is the measured melt index of the blend, f is the weight fraction of Component A in the blend, and F MS is ¥ 1.1. Also included in the present invention are foams, films, fibers, blow molded articles and extrusion coatings comprising said blend. |
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