US 11,667,763 B2
Cellulose-fiber dispersion polyethylene resin composite material, formed body and pellet using same, production method therefor, and recycling method for cellulose-fiber adhesion polyethylene thin film piece
Jirou Hiroishi, Tokyo (JP); Hidekazu Hara, Tokyo (JP); Yuka Sawada, Tokyo (JP); Masami Tazuke, Tokyo (JP); Toshihiro Suzuki, Tokyo (JP); and Shingo Mitsugi, Tokyo (JP)
Assigned to FURUKAWA ELECTRIC CO., LTD., Tokyo (JP)
Appl. No. 16/641,134
Filed by FURUKAWA ELECTRIC CO., LTD., Tokyo (JP)
PCT Filed Aug. 23, 2017, PCT No. PCT/JP2017/030214
§ 371(c)(1), (2) Date Feb. 21, 2020,
PCT Pub. No. WO2019/038868, PCT Pub. Date Feb. 28, 2019.
Prior Publication US 2020/0172684 A1, Jun. 4, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. C08J 5/04 (2006.01); C08G 63/183 (2006.01); C08J 5/18 (2006.01); C08J 11/06 (2006.01); C08K 7/02 (2006.01); C08L 1/02 (2006.01); C08L 23/06 (2006.01); C08L 23/12 (2006.01); C08L 77/00 (2006.01)
CPC C08J 5/04 (2013.01) [C08G 63/183 (2013.01); C08J 5/18 (2013.01); C08J 11/06 (2013.01); C08K 7/02 (2013.01); C08L 1/02 (2013.01); C08L 23/06 (2013.01); C08L 23/12 (2013.01); C08L 77/00 (2013.01); C08K 2201/004 (2013.01); C08L 2203/16 (2013.01); C08L 2205/03 (2013.01); C08L 2205/16 (2013.01); C08L 2207/062 (2013.01); C08L 2207/066 (2013.01); C08L 2207/20 (2013.01)] 32 Claims
 
1. A cellulose fiber dispersion polyethylene resin composite material, formed by dispersing a cellulose fiber into a polyethylene resin,
wherein a proportion of the cellulose fiber is 1 part by mass or more and 70 parts by mass or less in a total content of 100 parts by mass of the polyethylene resin and the cellulose fiber,
wherein the polyethylene resin satisfies a relationship: 1.7>half-width (Log(MH/ML))>1.0 in a molecular weight pattern obtained by gel permeation chromatography measurement; and
wherein the composite material has a dispersibility of the cellulose fiber such that a number of mountains having a peak top of 30 μm or more and being convex upward, from a surface of a formed body toward an outside thereof, when counted in all of 10 lines of roughness curves, is less than 20, wherein the following method is used for evaluating the dispersibility of the cellulose fiber within the composite material:
the composite material is dried by hot air at 80° C. to reduce a moisture content to 0.5% by mass or less;
the composite material is shaped to the formed body, which is in a sheet form having a dimension of 100 mm×100 mm×1 mm;
the formed body is immersed into water at 80° C. for 20 days;
a square having a size of 40 mm×40 mm is drawn in an arbitrary place on a surface of the formed body;
9 line segments having a length of 40 mm are drawn inside the square at an interval of 4 mm;
roughness on an intermediate line between adjacent two line segments is measured under conditions of cut-off value λc=8.0 mm and λs=25.0 μm by using a surface roughness measuring instrument to obtain 10 lines of roughness curves, specified by JIS B 0601 at an evaluation length of 40 mm; and
the number of mountains having a peak top of 30 μm or more and being convex upward, from the surface of the formed body toward an outside thereof, is counted in all of 10 lines of the roughness curves.