US 12,187,017 B2
Biodegradable laminate
Mai Inagaki, Chiyoda-ku (JP); Atsushi Kusuno, Chiyoda-ku (JP); and Kohei Kikuchi, Chiyoda-ku (JP)
Assigned to Mitsubishi Chemical Corporation, Chiyoda-ku (JP)
Filed by Mitsubishi Chemical Corporation, Chiyoda-ku (JP)
Filed on Aug. 25, 2020, as Appl. No. 17/001,868.
Application 17/001,868 is a continuation of application No. PCT/JP2019/013961, filed on Mar. 29, 2019.
Claims priority of application No. 2018-067298 (JP), filed on Mar. 30, 2018.
Prior Publication US 2020/0384750 A1, Dec. 10, 2020
Int. Cl. B32B 27/36 (2006.01); B32B 7/10 (2006.01); B32B 7/12 (2006.01); B32B 27/08 (2006.01); B32B 27/20 (2006.01); B32B 27/30 (2006.01); C08K 3/013 (2018.01); C08K 3/26 (2006.01); C08K 3/34 (2006.01); C08K 3/36 (2006.01); C08L 67/02 (2006.01); C08L 67/04 (2006.01); C08L 101/16 (2006.01); C09J 167/02 (2006.01); C09J 167/03 (2006.01)
CPC B32B 27/36 (2013.01) [B32B 7/10 (2013.01); B32B 7/12 (2013.01); B32B 27/20 (2013.01); B32B 27/306 (2013.01); B32B 27/08 (2013.01); B32B 2250/02 (2013.01); B32B 2250/03 (2013.01); B32B 2250/24 (2013.01); B32B 2264/1026 (2020.08); B32B 2264/1027 (2020.08); B32B 2307/7163 (2013.01); C08K 3/013 (2018.01); C08K 2003/265 (2013.01); C08K 3/34 (2013.01); C08K 3/346 (2013.01); C08K 3/36 (2013.01); C08L 67/02 (2013.01); C08L 67/04 (2013.01); C08L 101/16 (2013.01); C09J 167/02 (2013.01); C09J 167/03 (2013.01); Y02W 90/10 (2015.05)] 21 Claims
OG exemplary drawing
 
1. A biodegradable laminate, comprising:
an aliphatic polyester-based resin layer;
a bonding layer; and
a polyvinyl alcohol-based resin layer laminated on at least one surface of the aliphatic polyester-based resin layer with the bonding layer therebetween,
wherein the aliphatic polyester-based resin layer comprises an aliphatic polyester-based resin composition comprising:
(A) an aliphatic polyester-based resin comprising, in polymerized form, (A1) succinate, (A2) 1,4-butanediol, and optionally (A3) a further aliphatic dicarboxylate, with a molar ratio of the succinate unit to all dicarboxylate units in the aliphatic polyester-based resin (A) being in a range from 68 to 100%;
(B) a polyhydroxyalkanoate comprising, in polymerized form, (B1) a 3-hydroxybutyrate in at least 85 mol. %, and and (B2) 3-hydroxyhexanoate;
optionally, (Q) an additional resin other than the aliphatic polyester-based resin (A) and the polyhydroxyalkanoate (B); and
(C) an inorganic filler,
wherein a mass ratio of the total amount of the aliphatic polyester-based resin (A), the polyhydroxyalkanoate (B), the filler (C), and the additional resin (Q) relative to the aliphatic polyester-based resin layer is in a range of from 60 to 100% by mass,
wherein an [(A)+(B)]/[(A)+(B)+(Q)] mass ratio, of a sum of the aliphatic polyester-based resin (A) and the polyhydroxyalkanoate (B) to a sum of the aliphatic polyester-based resin (A), the polyhydroxyalkanoate (B), and the additional resin (Q), is in a range of from 70 to 100% by mass,
wherein a (C)/[(A)+(B)+(C)] ratio, of the inorganic filler (C) relative to a total amount of the aliphatic polyester-based resin (A), the polyhydroxyalkanoate (B), and the inorganic filler (C) in the aliphatic polyester-based resin composition, is in a range from 15 to 50% by mass, and
wherein an (A)/(B) mass ratio, of the aliphatic polyester-based resin (A) to the polyhydroxyalkanoate (B) comprised in the aliphatic polyester-based resin composition, is in a range of from 70/30 to 20/80.