Borealis AG, a company involved in business activities in chemical and plastics sector, has been recently granted a patent for invention titled “UNORIENTED FILM BASED ON SOFT POLYPROPYLENE”.
The patent has been issued as granted patent number 306197 filed as application number 6651/DELNP/2014 having scope (abstract) of invention as:
“Unoriented film comprising at least one layer of a polymer composition comprising a styrenic based elastomer and a propylene copolymer.”
The primary independent claim (claim 1) of this patent states:
“Unoriented film comprising at least one layer (LI), said layer (LI) comprises at least 70 wt.-% of a polymer composition (Co), said composition (Co) comprises (a) a propylene copolymer (A) having (al) a melt flow rate MFR2 (230 °C) measured according to ISO 1133 in the range of more than 2.0 to 15.0 g/lOmin, (a2) a comonomer content in the range of more than 7.5 to 16.5 wt.-%, and (a3) a xylene cold soluble content (XCS) determined according ISO 16152 (25 °C) in the range of 20.0 to 55.0 wt.-%, wherein (a4) the comonomer content of xylene cold soluble (XCS) fraction of the propylene copolymer is in the range of 14.0 to 30.0 wt.-%, and (b) a styrenic based elastomer(s) (B) having a styrene content in the range of 5 to equal or below 15 wt.-%. Unoriented film according to claim 1, wherein the unoriented film is a mono-layer or at least three layer film comprising the layers (LI), (L2) and (L3) with the stacking order (L2)/(L1)/(L3). Unoriented film according to claim 1 or 2, wherein the weight ratio of propylene copolymer (A) and the styrenic based elastomer(s) (B) [(A)/(B)] in the composition (Co) is in the range of 9/1 to 3/2. Unoriented film according to one of the preceding claims, wherein the propylene copolymer (A) (a) has a melt flow rate MFR2 (230 °C) measured according to ISO 1133 in the range of more than 2.5 to below 5.0 g/lOmin, and/or (b) fulfills inequation (I) Co (total) 0.3 <~ Co (XCS) <- 0.7 wherein Co (total) is the comonomer content [wt.-%] of the propylene copolymer (A), Co (XCS) is the comonomer content [wt.-%] of the xylene cold soluble fraction (XCS) of the propylene copolymer (A), and/or (c) fulfills inequation (II) Co (total) < 0.30 XCS wherein Co (total) is the comonomer content [wt.-%] of the propylene copolymer (A), XCS is the content of the xylene cold soluble fraction (XCS) [wt.-%] of the propylene copolymer (A). Unoriented film according to one of the preceding claims, wherein the xylene cold insoluble (XCI) fraction of the propylene copolymer (A) has a comonomer content in the range of 1.5 to 6.0 wt.-%. Unoriented film according to one of the preceding claims, wherein the propylene copolymer (A) has an intrinsic viscosity (IV) of the xylene cold soluble (XCS) fraction in the range of equal or more than 1.5 to equal or below 3.0 dl/g, wherein the intrinsic viscosity (IV) is determined according to DIN ISO 1628/1, (in Decalin at 135 °C). Unoriented film according to one of the preceding claims, wherein the propylene copolymer (A) is a heterophasic propylene copolymer (RAHECO) comprising a matrix (M) and an elastomeric propylene copolymer (E) dispersed in said matrix (M), wherein said matrix (M) is a random propylene copolymer (R-PP).”
The patent has been granted under International Patent Classification (IPC) C08L 23/14, B32B 27/32, C08J 5/18, which covers inventions related to:
C08L 23/14 – Copolymers of propene (C08L 23/16 takes precedence)
B32B 27/32 – Layered products essentially comprising polyolefins
C08J 5/18 – Manufacture of films or sheets
This patent can be opposed under post-grant patent opposition within 12 months of the date of grant of this patent.
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