Liquid repellent layer-forming resin composition, and liquid repellent film, liquid repellent laminate, packaging material, and container using same

Patent metadata

Field	Value
Publication number	US-12330849-B2
Application number	US-201917277218-A
Country	US
Kind code	B2
Filing date	Sep 17, 2019
Priority date	Sep 21, 2018
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

A liquid-repellent layer forming resin composition comprises a polypropylene resin (A) and a silylated polyolefin (B), wherein the polypropylene resin (A) comprises a random polypropylene resin (A1) and a block polypropylene resin (A2) with a mass ratio (Mass of random polypropylene resin (A1)/Mass of block polypropylene resin (A2)) in the range of 20/80 to 80/20.

First claim

The invention claimed is:

1. A liquid-repellent layer forming resin composition comprising:
a polypropylene resin (A); and
at least one silylated polyolefin (B) selected from the group consisting of polyethylene-silicone block copolymers,
wherein the polypropylene resin (A) has two or more endothermic peaks in the range of 130 to 170° C. in a melting curve in a second heating process obtained under measurement conditions where the following steps (1) to (5) are carried out sequentially, in differential scanning calorimetry of a measurement specimen of a liquid-repellent layer formed by using the liquid-repellent layer forming resin composition:
(1) heating to 200° C. at a heating rate of 10° C./min, as a first heating process;
(2) retaining at 200° C. for 5 minutes;
(3) cooling to 0° C. at a cooling rate of 100° C./min;
(4) retaining at 0° C. for 5 minutes; and
(5) heating to 200° C. at a heating rate of 10° C./min, as the second heating process,

wherein the polypropylene resin (A) comprises a random polypropylene resin (A1) and a block polypropylene resin (A2) with a mass ratio (Mass of random polypropylene resin (A1)/Mass of block polypropylene resin (A2)) in the range of 35/65 to 65/35, and
wherein the block polypropylene resin (A2) has a melting point higher than that of the random polypropylene resin (A1) by 10° C. or more.

2. The resin composition according to claim 1 , wherein the resin composition has a difference of 10° C. or more between a peak temperature of the endothermic peak on the highest temperature side and a peak temperature of the endothermic peak on the lowest temperature side in the range of 130 to 170° C. in the melting curve in the second heating process.

3. The resin composition according to claim 1 , wherein the polypropylene resin (A) has one or more endothermic peaks in the range of 130° C. or more and less than 150° C., and one or more endothermic peaks in the range of 150° C. or more and 170° C. or less, in the melting curve in the second heating process.

4. The resin composition according to claim 1 , further comprising a compatibilizer (C) having a site compatible with the polypropylene resin (A) and a site compatible with the silylated polyolefin (B).

5. The resin composition according to claim 4 , wherein the compatibilizer (C) comprises at least one selected from the group consisting of a block copolymer of propylene and ethylene and a block copolymer of ethylene and an ethylene-butylene copolymer.

6. The resin composition according to claim 1 , wherein the mass ratio (Mass of random polypropylene resin (A1)/Mass of block polypropylene resin (A2)) is in the range of 40/60 to 60/40.

Assignees

• Toppan Printing Co Ltd

Inventors

• Nagai Aki
• Tanaka Ryo
• Kimura Kentaro
• Kinoshita Kosuke
• FUKUTAKE Hitomi

Classifications

• C08L2205/08

  containing additives to improve the compatibility between two polymers · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08L53/00

  Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers · CPC title

• C08L23/26

  modified by chemical after-treatment (saponified copolymers C08L23/0861; unsaturated acid salts C08L23/0876) · CPC title

• B32B2439/46

  Bags · CPC title