Laminated article and molded article

Patent metadata

Field	Value
Publication number	US-12540438-B2
Application number	US-202118245596-A
Country	US
Kind code	B2
Filing date	Sep 9, 2021
Priority date	Sep 17, 2020
Publication date	Feb 3, 2026
Grant date	Feb 3, 2026

Abstract

A laminated article includes a base layer and a coating layer disposed over at least one side of the base layer. The coating layer contains a poly(3-hydroxybutyrate) resin. In a crystalline melting curve obtained by differential scanning calorimetry of the coating layer, the coating layer has at least one peak top temperature (Tma) in the range of 100 to 150° C. and at least one peak top temperature (Tmb) in the range of 150 to 170° C., and the difference between the temperatures Tma and Tmb is 10° C. or more.

First claim

The invention claimed is:

1 . A laminated article comprising:
a base layer; and a coating layer disposed over at least one side of the base layer, wherein the base layer is a layer of paper, the coating layer comprises a poly(3-hydroxybutyrate) resin, in a crystalline melting curve obtained by differential scanning calorimetry of the coating layer, the coating layer has at least one peak top temperature (Tma) in a range of from 100 to 150° C. and at least one peak top temperature (Tmb) in a range of from 150 to 170° C., a difference between the temperatures Tma and Tmb is at least 10° C., the poly(3-hydroxybutyrate) resin comprises poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) having a content of 3-hydroxyhexanoate unit of from 8 to 25 mol %, and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) having a content of 3-hydroxyhexanoate unit of from 0.1 to 1 mol %, and an amount of the poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) having the content of 3-hydroxyhexanoate unit of from 0.1 to 1 mol % is from 5 to 15 wt % of a total amount of the poly(3-hydroxybutyrate) resin contained in the coating layer.

2 . The laminated article according to claim 1 , wherein in the crystalline melting curve obtained by the differential scanning calorimetry of the coating layer, a ratio (ΔHb/ΔHa) of a crystalline melting enthalpy (ΔHb) of the peak in the range of from 150 to 170° C. to a crystalline melting enthalpy (ΔHa) of the peak in the range of from 100 to 150° C. is from 0.01 to 2.

3 . The laminated article according to claim 2 , wherein the ratio ΔHb/ΔHa is from 0.05 to 1.

4 . The laminated article according to claim 2 , wherein the ratio ΔHb/ΔHa is from 0.1 to 0.8.

5 . The laminated article according to claim 2 , wherein the ratio ΔHb/ΔHa is from 0.2 to 0.4.

6 . The laminated article according to claim 1 , wherein the poly(3-hydroxybutyrate) resin has a weight-average molecular weight of from 5×10 4 to 65×10 4 .

7 . The laminated article according to claim 6 , wherein the poly(3-hydroxybutyrate) resin has a weight-average molecular weight of from 15×10 4 to 50×10 4 .

8 . The laminated article according to claim 1 , further comprising an intermediate layer between the base layer and the coating layer.

9 . The laminated article according to claim 1 , wherein the difference between the temperatures Tma and Tmb is at least 20° C.

10 . The laminated article according to claim 1 , wherein the difference between the temperatures Tma and Tmb is from 10° C. to 60° C.

11 . The laminated article according to claim 1 , wherein the difference between the temperatures Tma and Tmb is from 20° C. to 50° C.

12 . The laminated article according to claim 1 , wherein an amount of a resin other than the poly(3-hydroxybutyrate) resin in the coating layer is from 0 to 10 parts by weight per 100 parts by weight of the poly(3-hydroxybutyrate) resin.

13 . The laminated article according to claim 1 , wherein the poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) having the content of 3-hydroxyhexanoate unit of from 8 to 25 mol % has a content of 3-hydroxyhexanoate unit of from 10 to 18 mol %.

14 . A molded article comprising the laminated article according to claim 1 .

15 . A method for producing the molded article according to claim 14 , the method comprising heat-sealing the coating layer.

16 . A method for producing the laminated article according to claim 1 , the method comprising:
applying an aqueous coating liquid comprising the poly(3-hydroxybutyrate) resin to a base to form a film of the aqueous coating liquid; and heating the film at a temperature of from 130 to 170° C. to form the coating layer.

Assignees

• Kaneka Corp

Inventors

• Fukutome Asuka
• Okada Yasunori
• Okura Tetsuo
• Murashima Kensuke

Classifications

• D21H25/06

  of impregnated or coated paper (D21H25/08 takes precedence) · CPC title

• D21H19/12 Primary

  applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B27/00

  Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)} · CPC title

• B32B27/08

  of synthetic resin · CPC title