Polypropylene based heat shrinkable film

Details Polypropylene based heat shrinkable film Polypropylene based heat shrinkable film

2006-04-25

2010-02-16

Gulakowski, Randy (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C526S072000

Reexamination Certificate

active

07662888

ABSTRACT:
A polypropylene based heat shrinkable film obtained by using a propylene-ethylene block copolymer (A) which satisfies the following requirements (A-i) to (A-iv), and having heat shrinkability imparted by orientation in at least one direction:(A-i) it is a propylene-ethylene block copolymer obtained through sequential polymerization catalyzed by a metallocene catalyst which is composed of 30 to 95 wt % of a propylene homopolymer or propylene-ethylene random copolymer component (A1) having an ethylene content of at most 7 wt % produced in a first step and 70 to 5 wt % of a propylene-ethylene random copolymer component (A2) produced in a second step having an ethylene content higher by 3 to 20 wt % than that of the component (A1);(A-ii) it has a melt flow rate (MFR: 2.16 kg, 230° C.) within a range of 0.1 to 30 g/10 min;(A-iii) a temperature-loss tangent (tan δ) curve obtained by dynamic mechanical analysis (DMA) has a single peak at a temperature of at most 0° C.;(A-iv) in a temperature rising elution fractionation (TREF) curve obtained as a plot of an elution amount (dwt %/dT) to a temperature by means of temperature rising elution fractionation (TREF) using an o-dichlorobenzene solvent in a temperature range of −15° C. to 140° C., a peak temperature T(A1) observed at a high temperature side is within a range of 60° C. to 88° C., a peak temperature T(A2) observed at a low temperature side is at most 40° C. or a peak temperature T(A2) is not observed, and a temperature T(A4) at which 99 wt % of the total amount of the propylene-ethylene block copolymer is eluted is less than 90° C.

REFERENCES:
patent: 4786562 (1988-11-01), Kakugo et al.
patent: 2002/0064611 (2002-05-01), Kanai et al.
patent: 2002/0193527 (2002-12-01), Nakata et al.
patent: 2004/0010087 (2004-01-01), Obata et al.
patent: 2004/0198912 (2004-10-01), Dharmarajan et al.
patent: 0 942 020 (1999-09-01), None
patent: 1 588 843 (2005-10-01), None
patent: 1588843 (2005-10-01), None
patent: 1 593 708 (2005-11-01), None
patent: 8-244182 (1996-09-01), None
patent: 2000-239462 (2000-09-01), None
patent: WO 98/10016 (1998-03-01), None
patent: WO 02/070572 (2002-09-01), None
patent: WO 03/076510 (2003-09-01), None
patent: WO 03/106523 (2003-12-01), None
patent: WO 03106523 (2003-12-01), None
patent: WO 2004/072174 (2004-08-01), None

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