US 11,718,077 B2
Clear film for tapes and labels
Jame Wong, Port Lavaca, TX (US); Chris Watts, Victoria, TX (US); Jenchyou Hwang, Sugar Land, TX (US); Juan Rosales, Edna, TX (US); Todd O'Reilly, Morristown, TN (US); Ron Silen, Livingston, NJ (US); and Lisa Vasquez, Morristown, TN (US)
Assigned to INTERPLAST GROUP CORPORATION, Livingston, NJ (US)
Filed by Inteplast Group Corporation, Livingston, NJ (US)
Filed on Jan. 14, 2022, as Appl. No. 17/576,413.
Application 17/576,413 is a continuation of application No. 16/287,384, filed on Feb. 27, 2019, granted, now 11,241,868.
Claims priority of provisional application 62/635,909, filed on Feb. 27, 2018.
Prior Publication US 2022/0134722 A1, May 5, 2022
Int. Cl. B32B 27/20 (2006.01); B32B 27/08 (2006.01); B32B 27/32 (2006.01)
CPC B32B 27/20 (2013.01) [B32B 27/08 (2013.01); B32B 27/32 (2013.01); B32B 2250/03 (2013.01); B32B 2250/40 (2013.01); B32B 2264/101 (2013.01); B32B 2307/746 (2013.01); B32B 2405/00 (2013.01); B32B 2519/00 (2013.01)] 20 Claims
 
1. A multilayer film for use in adhesive tape or adhesive label applications comprising:
a core layer comprising a polypropylene mini-random homopolymer, wherein the mini-random homopolymer comprises polypropylene, up to 2 wt % ethylene components, and an acid neutralizer in a concentration up to 5000 ppm calcium;
a first skin layer on a first side of the core layer and a second skin layer on a second side of the core layer, wherein the skin layers each comprise
a) at least about 95 wt % of a polypropylene mini-random homopolymer comprising polypropylene, up to 2 wt % ethylene components, an acid neutralizer in a concentration up to about 5000 ppm, and
b) an anti-block agent comprising homopolymer of polypropylene and silica having a particle size between about 1 to 3 μm;
wherein the first and second skin layers each have an amount of the homopolymer of polypropylene by weight and an amount of the silica by weight and wherein a ratio of the amount of the homopolymer of polypropylene by weight to the amount of silica by weight is greater than 95-to-5;
wherein the first and second skin layers comprise from 20 ppm to 450 ppm silica by weight.